In the dazzling world of stage performances, the role of stage machinery is increasingly prominent, with its technical requirements continuously rising alongside innovations in performance forms. Since 2018, YZ DITECH has applied absolute value servo motors in stage machinery, bringing a new technological revolution to stage performances and leading the development trend of servo motors in this field, becoming a key driving force for precise control in stage machinery.

Stage machinery encompasses various complex motion forms such as lifting, sliding, and rotation. These movements require highly precise control to ensure the smoothness and safety of performances. Traditional motor control methods often face many limitations when addressing the complex demands of stage machinery.

For example, traditional incremental encoder motors require a homing operation at each startup, which not only increases operational complexity but can also lead to cumulative positioning errors. Additionally, in stage performances, equipment may be subjected to various interferences, such as electromagnetic interference from lighting equipment and frequent start-stop operations, posing severe challenges to the reliability and anti-interference capabilities of motors.

Absolute value servo motors, with their unique absolute value encoders, bring numerous significant advantages to stage machinery, perfectly addressing the pain points of traditional motor control methods.

1. No Homing Operation Required, Quick Positioning
   Absolute value encoders can directly read the exact position of the motor shaft at any time without the need for a homing operation. This feature is particularly important in stage machinery applications. For instance, in complex stage lifting devices, multiple lifting platforms need precise synchronization. Absolute value servo motors can accurately obtain the position information of each platform at the moment of startup, quickly achieving synchronized control and significantly improving the response speed and control accuracy of stage machinery.
2. High Precision and High Reliability
   Each position of the absolute value encoder is unique and does not rely on previous data readings, thus avoiding errors such as missed counts or accumulated counts. In stage performances, this high precision and reliability ensure the accurate movement of stage machinery, preventing performance errors due to positioning inaccuracies. For example, in stage rotation devices, absolute value servo motors can precisely control the rotation angle, ensuring that dancers or props are accurately positioned during the rotation, enhancing the visual effect and artistic impact of the performance.
3. Strong Anti-Interference Capability
   The stage environment is complex, with various electromagnetic interferences and mechanical vibrations. The absolute value encoder of absolute value servo motors operates independently in terms of data refresh and reading, making it unaffected by interference and capable of stable operation. Even after power failures or equipment restarts, it can immediately return to the accurate position without needing recalibration. This strong anti-interference capability allows stage machinery to maintain stable operation in various complex environments, enhancing the safety and reliability of the equipment.
4. Support for High-Speed Data Transmission
   Modern stage performances demand high precision and response speed from stage machinery. Absolute value servo motors support multiple high-speed data transmission protocols, such as Canopen, Profibus-DP, and Profinet, enabling fast and stable data transmission. This allows stage machinery to receive control commands in real-time and respond quickly to performance needs, achieving complex multi-axis synchronous control. For instance, in the scene transitions of large stage plays, multiple mechanical devices need to operate simultaneously. Absolute value servo motors can ensure the precise synchronization of these devices, making scene transitions smooth and natural.

A servo system is a control device that operates according to command instructions, applied in the servo control of motors. Sensors are installed on the motor and the controlled machine, and the detection results are compared with the command values in the servo amplifier. It can be understood that servo motors are controlled by feedback signals, which differentiates them from stepper motors that rely on input pulse signals for control.

Servo motors allow for very precise control of speed and position, converting voltage

signals into torque and speed to drive the controlled object. The rotor speed of a servo motor is controlled by the input signal and can respond quickly. In automatic control systems, they serve

 as actuators and possess characteristics such as small electromechanical time constants, high linearity, and starting voltage, enabling them to convert received electrical signals into angular displacement or angular velocity outputs on the motor shaft.

The key component of an absolute value servo motor is its absolute value encoder. This encoder serves as an important sensor for mechanical position angles, lengths, and speed feedback in industrial applications, playing a crucial role in the precise control of the motor.

Since 2018, the use of absolute value servo motors in stage machinery has led the development of servo motors in this field. Their characteristics of high precision, high reliability, and fast response can meet the demands of stage machinery in complex performance scenarios, such as precise control of stage lifting, sliding, and rotation, ensuring the smoothness and safety of performances.

Differences Between Absolute Value Encoders and Incremental Encoders

• Incremental Encoders:
• Working Principle: They represent changes in position through output pulse signals, requiring continuous counting by subsequent devices to determine position. This is a method of measuring relative position information.
• Advantages and Disadvantages:
• Advantages: Generally cheaper than absolute value encoders, and their performance is sufficient for applications requiring low resolution.
• Disadvantages: Requires a reset operation at each startup; otherwise, the exact position of the motor shaft cannot be determined. Errors such as missed counts and cumulative counts may occur.
• Absolute Value Encoders:
• Working Principle: They establish a reference point after device initialization, and all subsequent position information is based on the absolute position relative to this reference point. Continuous counting by subsequent devices is unnecessary, as the current position value can be read directly. This is a method of measuring absolute position information.
• Advantages and Disadvantages:
• Advantages: The exact position of the motor shaft can be known at any time without needing a reset operation. For applications requiring multiple positioning, it can improve system response speed and stability. There are no errors such as missed counts or cumulative counts.
• Disadvantages: Higher cost, especially for applications requiring high resolution, where the price is even more elevated.

The Importance of the "Absolute" Concept in Absolute Value Encoders

• Independence and Uniqueness: All position values within an absolute value encoder are "absolutely" determined within the encoder after it leaves the factory. After initializing the reference point, each position is independent and unique. Each data refresh reading, both internally and externally, does not rely on previous data readings.
• Avoiding Error Accumulation: Compared to incremental encoders, absolute value encoders do not suffer from cumulative errors due to power outages or interference. Each reading is independent and unaffected by prior readings.
• Application Scenarios:
• High Speed and Cost Efficiency: Provides absolute code values for each axis position without the need for counting, allowing for direct high-speed internal readings and external outputs. This reduces the computational burden on subsequent receiving device controllers and lowers the cost of additional input components, making it suitable for industrial robots working in multi-axis parallel operations and multi-axis synchronous control fields.
• Safety and Reliability: After power is turned on or in the event of a power failure, the current accurate position can be obtained without referencing the drive. It is unaffected by interference in complex industrial electrical environments, making it suitable for applications such as wind turbine pitch systems, port machinery synchronous positioning, lifting machinery, construction machinery (tower cranes), elevators, engineering machinery, steel metallurgy, petrochemicals, hydropower, medical equipment radar cannon rotation devices, solar tracking rotation devices, and large industrial robots in heavy industry, nuclear industry, and automotive manufacturing.
• High-Speed Bus Features: Supports standard industrial field buses such as Canopen, Profibus-DP, Profinet, Ethernet industrial Ethernet, Endat2.2, Hiperface, Biss, and dedicated high-speed data transmission protocols with CRC data safety over RS485, which incremental encoders cannot achieve.
• High Bit Resolution Features: Directly outputs digital signals without internal and external counting, unaffected by the limitations of reading "pulses" and "accumulation" in high-speed response scenarios. This enables high bit resolution, meeting the demands for high-speed precise positioning and minimal step jitter in servo motors and robots, such as accurate calculations of high-order position derivatives (motion rigidity) like acceleration and jerk, as well as precise positioning of minimal sway at the front end of robotic arms.
• 

Selection and Usage Recommendations

• Avoid Confusion:
• Confusion 1: Distinguish between the "absolute working mode" of receiving devices and the "absolute" nature of absolute value encoders in servo motors. The "absolute" working mode of receiving devices can be achieved through an incremental encoder combined with its own counting and accumulation device and battery memory. However, this method carries the possibility of counting errors, accumulation errors, power supply failures of the counting device, and inability to respond at high speeds, which is different from a true absolute value encoder.
• Confusion 2: Differentiate between absolute single-turn encoders combined with internal and external counting and accumulation devices and true absolute multi-turn encoders. The former loses its "independence" and "uniqueness" after exceeding 360 degrees, relying on counting to determine the single-turn absolute position information within the total number of turns, which introduces the possibility of counting errors and power supply failures during operation. In contrast, a true absolute multi-turn encoder continues to provide "independent" and "unique" absolute coding beyond 360 degrees without relying on previous data for accumulation.
• Ensure "Absolute Coding": When selecting and using absolute value encoders, it is essential to confirm that their internal structure is indeed a true "absolute coding" system. This ensures the absolute reliability and high-speed accuracy of the data, guaranteeing that all positions are independent and unique without relying on counting (whether internal or external, with or without battery).

Abstract: Comparing principles, construction, performance, and stage applications – including selection advice and maintenance points.

In stage rigging, electric chain hoists and winches each have distinct characteristics in design, performance, and application. This article compares them step by step — definitions, technical specs, use cases, industry standards, selection guidelines, maintenance, and common pitfalls — so you can make safer, faster decisions on equipment for touring, theatre, TV, concerts and fixed   installations.

Audience:

1. Non-technical decision makers (event organizers, venue managers, promoters) — quick, actionable guidance and a clear understanding of each device’s function and which equipment suits which scenario.
2. Technical readers (stage rigging engineers, scenic contractors, rental technicians) — detailed technical points and standard references valuable for design, procurement, and inspection.

1. Core Conclusion: The Essentials in One Line

1. Electric chain Hoist: excels at short-travel, high-frequency vertical lifts with precise positioning.
2. Winch:  excels at long-travel or horizontal pulling tasks requiring high pulling force.
3. Note: in this article “electric chain hoist” refers specifically to ring-chain (load-chain) entertainment hoists rather than drum/wire-rope hoists. This distinction maps to international standards: “EN 14492-2:2019 — Cranes: Power Driven Winches and Hoists, Part 2 — Power Driven Hoists” focuses on hoists, while “ASME B30.7 — Winches” covers drum-type winches.

2. Definitions and Quick Comparison (For Non-Experts)

2 1. What is an Electric chain Hoist?

1.  Definition: A vertically-hung lifting unit that uses a load chain running over a chain wheel and gearbox, driven by a motor (ring-chain hoist)
2. Purpose: Designed for precise vertical lifting, frequent stops and starts, and accurate positioning (e.g. lifting lighting trusses, LED screens, or scenery elements).
3. Safety Standards: Under “ASME B30.16 — Overhead Underhung and Stationary Hoists” and “EN 14492-2:2019”, electric hoists must include dual brakes, limit switches, and appropriate safety factors to prevent uncontrolled load drop.
4. Product example: YZDITEC’s C1 Servo Hoist meets entertainment industry safety and performance requirements: it is certified to BGV-C1, CE marked, and conforms to EN 17206; it uses an absolute-encoder servo motor and SIL-class control architecture to provide precise, reliable operation.

2 2. What is a Winch?

1. Definition: A pulling device centered on a rotating drum around which a steel cable or rope is wound. Winches are usually base-mounted (fixed to a floor or platform) and often use guide pulleys to redirect the cable.
2. Purpose: Suited for long travel distances or horizontal pulls. Common applications include moving large scenery, trusses, bridges, or heavy screens across the stage.
3. Safety Standards: ASME B30.7 — Winches defines drum design, rope layout, braking systems, and load testing requirements for safe winch operation.
4. Product example: YZDITEC’s High-Speed Winch models can incorporate dual electromagnetic brakes, integrated load cells, servo drives with absolute encoders, and anti-tangle rope devices, delivering real-time load monitoring and a 12:1 safety factor on wire ropes.
   

4. Technical Comparison: Mechanical & Control Perspectives

4. 1. Lifting Medium: Chain vs Drum & Cable

1. Hoist (ring-chain): Uses a steel load chain running over a chain wheel and gearbox.
2. Winch (drum): Uses a cable wound on a drum; long runs are possible but drum layering changes effective diameter and thus line speed and tension, requiring compensation.
3. Control note: Control systems often use encoder feedback, tension sensors, or constant-diameter drum designs to reduce drum-layer effects in high-precision winch applications.
4. Stage Relevance: Short, precise lifts (e.g. adjusting a lighting truss or dropping small props) are best done with ring-chain hoists. Long-distance moves (e.g. sliding a large LED screen or shifting a stage bridge) are best done with winches or drum-type wire-rope hoists, often with position feedback (encoder) to compensate for drum wrap effects.

4.2. Power Transmission and Braking Systems

1.  Hoist: Typically uses gear-reduction drives and is fitted with dual brakes (main and emergency) plus upper/lower limit switches to meet fail-safe requirements (EN 14492-2 / ASME B30.16). High-end servo ring-chain hoists add absolute encoders, position memory after power loss, and closed-loop servo control to deliver millimeter-level repeatability and rapid response — features especially valuable for synchronized scenic motion and performer flying systems.
2. Winch:  Designed for drum braking and sustained duty; drums usually have individual brakes sized to withstand thermal loads during long pulls. ASME B30.7 requires appropriate brake and rope management design.
3. Stage Relevance: Hoists suit cue-accurate, frequent stops; winches suit sustained pulls and long runs if drum effects are managed.
4. Example — YZDITEC Electric Stage Hoist：Offers ±1 mm positioning accuracy, ultra-smooth motion (0.01 – 0.5 m/s), dual electromagnetic brakes, integrated load cell, 4-point limit switches, IP65 enclosure, and quiet operation (~ 68 dB) — a configuration trusted for performer-flying and precision scenic automation.
5. Example — YZDITEC Heavy Duty Winch： Uses a servo-driven drum with dual electromagnetic brakes, real-time load monitoring, anti-sway motion algorithms, and redundant E-stop circuits — providing smooth heavy-load handling up to 1000 kg with ± 1 mm positioning.

        These configurations illustrate how modern servo technology and dual-brake designs deliver greater holding power, safety compliance, and operator confidence on live event stages.

4. 3. Installation and Positioning

1. Hoist: Hung on trusses or mounted on powered trolleys — ideal for touring due to compactness and standardized hanging points.
2. Winch:  Anchored to floor or fixed structures; direction changes via pulleys.
3. Stage Relevance: Touring and temporary stages prefer chain hoists (lightweight, quick rigging). Large fixed theaters or heavy scenic moves often use winches (installed on stage floor or house grid, pulling loads over long spans).
4. Integration note: For multi-axis scenic automation, servo hoists integrated into EtherCAT-based control environments enable synchronized cluster movement across multiple axes.
5. YZ DITEC in practice—Advantage of Electric Lifting Hoist

         YZDITEC’s servo-driven electric chain hoists, when paired with our EtherCAT-based Show Control Automation Console, deliver ultra-precise synchronized multi-axis motion—scalable up to 128 axes. Thanks to ±1 mm positioning accuracy, adjustable speed (0.01–0.5 m/s), absolute encoders with power-loss memory, and real-time load-cell feedback, multiple hoists can lift, tilt, rotate, or track LED walls, scenic bridges, and performer-flying rigs perfectly in sync across the stage.

The system’s plug-and-play EtherCAT integration plus Pando 3D simulation allows virtual pre-programming and near-instant setup—cutting on-site installation time by up to 50 percent—while maintaining BGV-C1, EN 17206, and SIL3-compliant safety for show-critical moves.

4. 4. Travel Length and Speed Characteristics

1. Hoist: Best for short lifts (practical chain lengths in the meter to low-tens-of-meters range) with high positional accuracy; speeds are adjustable via VFDs or servo drives. Extended travel with ring-chain hoists is normally achieved by using trolley/track systems rather than drum reeving.
2. Winch:  Can provide very long travel distances limited by cable length and drum capacity; line speed and tension change with drum layering unless compensated.
3. Stage Relevance: Millimeter-level accuracy favors servo-driven hoists; long-travel tasks favor winches with encoder/tension management.

4. 5. Capacity and Safety Factor

1. Hoist: Ranges from a few hundred kilograms to tens of tons; entertainment ring-chain hoists typically cover 250–2000 kg for common stage use. “EN 14492-2” and “ASME B30.16” require redundant braking and limit devices on personnel-rated hoists. And according to “EN 818-7” (G80 hoist chains) and stage-rated standards such as “BGV-C1” and “EN 17206”, stage hoists for lifting loads above people are required to use fine-tolerance alloy steel chains with a minimum safety factor of 8:1, and often up to 10:1 depending on application.
2. Winch: Also covers hundreds of kilograms up to multi-ton capacities; ASME B30.7 requires emergency braking and rope-management controls.
3. Stage relevance: Only purpose-certified equipment should be used for personnel lifting; material hoists and non-certified winches must not be used for man-riding.
4. Certification note: Devices certified to BGV-C1, EN 17206 and bearing CE marking indicate design, testing and documentation adequate for operation above people (i.e., allowed to run over performers/audience) when used according to the certificate scope.
5. Example: YZDITEC chain hoists utilize Japan-made FEC G80 high-strength alloy-steel chains with a safety factor of 12, dual-brake design, overload-limiting clutch, and IP65 dust-/water-resistant housings, ensuring safer operation under show-critical conditions.
6. Example: YZDITEC winches feature redundant braking, over-speed detection, and electronic load monitoring, providing high safety margins for heavy-duty scenic or stage lift operations.

5. Standards and Regulations (Must-Comply)

5.1 Electric Hoist / Lifting Hoist:

1. “EN 14492-2:2019 — Cranes: Power Driven Winches and Hoists — Part 2: Power Driven Hoists” — design, brake and limiter requirements, safety factors, inspection/testing.
2. “ASME B30.16 — Overhead Underhung and Stationary Hoists” — installation, maintenance, marking, safe operation.
3. For entertainment/people-over scenarios, “EN 17206” and German entertainment guidance (historically “BGV-C1”, now integrated into “DGUV recommendations”) provide additional tests and operational requirements specific to stage use; CE conformity plus these references is commonly required to authorize operation above performers/audience.

5.2 Winch:

1. “ASME B30.7 — Winches” — drum, rope arrangement, braking, testing and inspections.
2. “EU machinery directive & CE conformity” apply to winches; check national stage rigging rules and venue certification requirements for operation over people.

5.3 Application Guidance:

1. For EU/CE markets: verify “EN 14492-2” (hoist), “EN 17206” (stage equipment), and CE declaration; prefer devices with explicit entertainment-use certification for people-over applications.
2. For Americas: follow ASME B30.16 for hoists and ASME B30.7 for winches.

       If the risk assessment requires high functional safety for the control layer, specify “SIL3” or equivalent safety integrity levels for redundancy and diagnostic coverage.

6. Stage Scenarios and Recommendations

1. Touring / Temporary Stages: Use ring-chain servo hoists for compact, synchronized, low-noise, low-speed precision and fast rigging. For example, a certified C1 Servo Hoist (500 kg) provides dual electromagnetic brakes, integrated load cell, 4-point limit switches, IP65 protection, absolute encoders with position memory after power loss, and ±1 mm positioning — suitable for performer flying, synchronized LED wall lifts and automated scenic transitions.
2. Large Scenic Moves (Long Travel): Use winches or drum-type wire-rope hoists with encoder feedback and tension management for long runs and heavy loads. High-performance winch families can provide servo control, dual brakes, integrated load monitoring and anti-tangle systems for reliable long-travel operations.
3. Lifting Personnel / Special Effects: Use only certified man-riding systems with documented compliance; never substitute material hoists or non-personnel winches.

Forever Club: YZDITEC's Integrated Stage Solution with servo hoist & 3D simulation

7. Five-Step Selection Process

1. Assess conditions: motion direction (vertical, horizontal, combo), max load, travel distance, duty cycle. (frequency of use).
2. Initial equipment choice: short travel & high-frequency& high-precision → ring-chain hoist (servo when low-speed precision matters); long travel/heavy& horizontal pull → winch or drum-type wire-rope hoist.
3. Check standards: EU → EN 14492-2 and EN 17206 / CE; US/international projects → ASME B30.16 (hoist) / ASME B30.7(winch).
4. Design redundancy and safety: dual brakes, limit switches, load monitoring; for people-over use require entertainment certifications(BGV-C1 / EN 17206)  and consider SIL3 equivalent safety for control systems.
5. Acceptance testing: no-load and full-load tests, verify limiters/brakes, record test reports and inspection schedule in procurement documentation.

8. Maintenance Tips and Common Issues

1. Electric Hoist: Inspect load chain for wear/elongation, verify gearbox lubrication and backlash, check hooks and attachments, test limit switches and emergency stops. Emphasize gearbox and chain inspection specific to ring-chain hoists rather than drum/wire-rope checks.
2. Winch:  Inspect wire rope for broken wires, kinks, corrosion; ensure even spooling on drum; monitor brake temperature during long pulls.
3. Inspection Schedule (recommendations):     

1. Daily: Visual check, lubrication, limit switch function.
2. Weekly: Functional brake and limiter tests; chain/cable tension checks.
3. Monthly/Annual: Disassemble and inspect brakes/gears; perform nondestructive tests on critical parts; conduct rated-load tests.
4. For entertainment personnel-over equipment, require annual third-party inspection/certification and retain test records for venue/insurer audits.
5. Note: YZDITEC’s smart servo electric chain hoist manual includes detailed maintenance guidance. The manual also features clear structural diagrams to help you better understand the hoist’s construction, working principles, and key configurations. Readers can download the manual here for step-by-step procedures and visual references.
   

9. Common Misconceptions (FAQ)

1. “Are winches always cheaper than hoists?” No — not necessarily; high-capacity, multi-drum winches or custom long-travel systems can cost more than advanced entertainment hoists.
2. “Can hoists do long travel?” —Yes, with additional trolley/track systems, but this greatly increases complexity and cost; ring-chain hoists do not use drum reeving — extended travel is achieved mechanically.
3. “Can I substitute a hoist for a winch or vice versa?” —Generally each is built for its purpose under different standards. Never use material hoists or non-certified winches for personnel lifts.

10. Conclusion and Actionable Recommendations

      3-Step Decision Method:

1. Direction: Vertical lifting → prefer ring-chain hoist; horizontal/long pulls → prefer winch.
2. Travel Distance: Short travel → hoist; long travel → winch.
3. Precision & Duty: High precision/high cycle → servo hoist; continuous heavy pulls → winch.

      Require manufacturer documentation — CE declaration, EN 14492-2 / EN 17206 test reports, BGV-C1 (DGUV) evidence where applicable, ASME certificates, and any SIL3 functional safety statements — and include applicable standards and acceptance tests in the procurement contract.

      For event production managers, stage engineers, and venue owners, a clear understanding of the differences between electric chain hoists and winches—along with careful evaluation of standards compliance, lifting medium, motion profiles, and maintenance support—ensures both creative freedom and uncompromised safety. Selecting the right certified equipment and following disciplined   maintenance keeps stage projects running smoothly and reliably, while YZDITEC’s EN 17206 / BGV-C1-certified, servo-controlled, precision-engineered hoists and winches deliver confidence in safety,   accuracy, and seamless show integration worldwide.

Status and Role:

In modern industrial automation, servo motors are the "precise brain" of mechanical movement. As the core execution component of the servo system, they achieve high-precision control of mechanical movement through real-time feedback and dynamic adjustments.

Working Principle:

The servo system acts according to the command instructions, with sensors installed on the motor and the controlled object machine. The detection results are returned to the servo amplifier for comparison with the instruction value. The servo motor is controlled by feedback signals, which differs from the input pulse signal control of stepper motors.

Performance Characteristics:

It can precisely control speed and position, converting voltage signals into torque and rotational speed to drive the controlled object.

The rotor speed is controlled by input signals and can respond quickly, with small electromechanical time constants, high linearity, and low starting voltage.

The speed can be controlled precisely, with a wide range of speed control, enabling stable, smooth constant-speed operation. Speed can be changed at any time, and stability is maintained even at very low speeds. It can quickly reverse and accelerate/decelerate, with brief static and dynamic transition times, maintaining position even with external forces applied. It generates high torque instantly within the rated capacity range and has high output power and efficiency.

Classification:

Divided into two main categories: DC and AC servo motors. The main characteristic is that there is no rotation phenomenon when the signal voltage is zero, and the speed decreases steadily as torque increases.

Encoder of the Servo Motor Function:

The encoder is a crucial component of the servo motor, used to sense the rotation of the motor and feedback signals to the driver. The driver compares the feedback value with the target value to adjust the rotor's rotation angle. The precision of the servo motor depends on the precision of the encoder.

Classification and Features:

◻ Incremental Encoder:

Converts displacement into periodic electrical signals, which are then transformed into counting pulses, indicating the size of displacement by the number of pulses.

The disadvantage is when the encoder does not move or loses power; it relies on internal memory of counting devices to remember the position. It cannot move after a power failure, and when power is restored, it cannot lose pulses; otherwise, the counting device’s memory zero point will shift, leading to inaccurate positioning. The solution is to add reference points and find them before each operation, including zeroing upon startup.

◻ Absolute Encoder:

Each position corresponds to a definite digital code, and the indication is only related to the starting and ending measurement positions, independent of the intermediate process.

The code disk has many graduation lines, and by reading the light and dark states of each graduation line, a unique binary code (Gray code) is obtained, referred to as an n-bit absolute encoder. It is determined by the mechanical position of the code disk and is not affected by power failures or interference. There is no need to memorize, seek reference points, or continuously count. It has strong anti-interference characteristics, high data reliability, and positioning accuracy superior to incremental encoders, and is increasingly applied in servo motors.

Due to its high precision and multiple output digits, it is generally selected for serial output or bus-type output, which is relatively expensive.

Application:

The aforementioned features determine the safety and reliability characteristics of servo motors, making them suitable for applications with safety requirements. These include wind turbine pitch control systems, port machinery synchronized positioning, lifting machinery, construction machinery (tower cranes), elevators, engineering machinery, steel metallurgy, petrochemicals, hydropower, medical equipment radar cannon rotation devices, solar tracking rotation devices, as well as large industrial robots in fields such as heavy industry, nuclear industry, and automotive manufacturing.

With the development of the stage industry, the demands for precision, reliability, and response speed in stage machinery have become increasingly high. The characteristics of absolute value servo motors, such as high-precision position feedback, rapid response, and anti-interference capability, can effectively meet the needs of stage machinery in complex performance scenarios. This includes precise control of stage lifting, sliding, and rotation, ensuring the smoothness and safety of performances. Since 2018, YZ DITECH has applied absolute servo motor to stage machinery, driving the development of servo motors in the stage machinery industry.

Summary：

Servo motors play a significant role in the field of industrial automation due to their high precision control, rapid response, and stable performance. Encoders, especially absolute encoders, as their key components, provide strong assurance for the precise control of servo motors with their unique advantages, promoting industrial automation to a higher level of development.

In fields such as industrial automation, stage machinery, robotics, and CNC machining, the choice of motor is crucial for system performance. Servo motors and asynchronous motors (induction motors) are two common types of industrial motors, each with its own characteristics and applicable scenarios. However, with the development of automation and intelligent control technologies, servo motors are gradually replacing traditional asynchronous motors in many applications due to their precise control and efficient performance.

Main Differences Between Servo Motors and Asynchronous Motors

1. Working Principle

• Asynchronous Motors operate based on the principle of electromagnetic induction. When the stator coil is energized, it generates a rotating magnetic field, and the rotor obtains current through induction and subsequently rotates. Due to the delay in the induced current, the rotor's speed is always lower than the stator's synchronous speed, resulting in a certain slip rate, which leads to relatively low control precision for asynchronous motors.
• Servo Motors use permanent magnet synchronous motors as the actuator, equipped with encoders and closed-loop control systems. They can accurately detect the motor's real-time position, speed, and torque, maintaining synchronous operation to ensure precise control.

2. Control Method

• Asynchronous Motors mainly employ open-loop control, adjusting the input voltage or using a frequency converter to change the speed. This control method is simple in structure but responds slowly to changes in load, making precise positioning difficult.
• Servo Motors utilize closed-loop control, providing real-time feedback on speed and position through encoders, with servo drives dynamically adjusting current and voltage to achieve precise speed and positioning control. This method not only maintains stable speed but also allows for rapid adjustments during sudden load changes, with extremely fast dynamic response.

3.             3. Dynamic Response Performance

• Asynchronous Motors have significant inertia, leading to slower responses during acceleration and deceleration, making it difficult to meet the demands for high-frequency start-stop or rapid direction changes.
• Servo Motors, due to their lightweight rotor structure and advanced electronic control technology, can achieve response speeds in the millisecond range, making them particularly suitable for high-speed start-stop, rapid speed changes, and complex trajectory tracking applications.

4.              4. Precision and Stability

• Asynchronous Motors lack precise feedback control, resulting in lower positioning accuracy and greater susceptibility to load variations, which can lead to speed fluctuations.
• Servo Motors utilize high-precision encoders (such as 17-bit or 23-bit encoders) for real-time position feedback, enabling motion control with micron-level or higher precision, resulting in minimal error and excellent stability.

5.         5. Speed Regulation Range

• Asynchronous Motors have a minimum starting voltage limit, leading to significantly reduced efficiency at low speeds and a tendency to overheat at high speeds, resulting in a narrow speed regulation range.
• Servo Motors support a wide range of speed regulation, maintaining stable output torque even at low or zero speeds, making them suitable for high-precision machining and complex motion control scenarios.

Core Advantages of Servo Motors

1. High Precision Motion Control
   The closed-loop control system and high-resolution encoders of servo motors enable positioning accuracy at sub-micron or even nanometer levels, making them particularly suitable for applications requiring precise position control, such as CNC machine tools, robotic joints, and stage machinery automation.
2. Excellent Dynamic Response Capability
   Servo motors typically have response times within a few milliseconds, which is a significant advantage compared to the tens to hundreds of milliseconds of asynchronous motors. Their rapid acceleration and deceleration capabilities are ideal for automated equipment with high-frequency start-stop requirements, such as electronic assembly, precision spraying, and laser cutting.
3. Higher Energy Efficiency
   Due to the use of permanent magnet synchronous technology, servo motors generally achieve energy efficiency above 90%, saving 10%-30% more energy compared to asynchronous motors. This not only reduces long-term operating costs but also decreases system heat generation, extending equipment lifespan.
4. Intelligent Control and Networking Capabilities
   Modern servo motors support various communication protocols (such as Modbus, EtherCAT, Profinet, etc.), allowing seamless integration with control systems like PLCs, DCS, and industrial computers. This enables remote monitoring, intelligent adjustments, and automated control, enhancing the flexibility and intelligence of the system.
5. Adaptability to Complex Operating Conditions
   Servo motors are suitable for extreme low-speed, high-torque, high-precision, and fast-response conditions. For example, in the field of stage machinery, applications like lifting points and track cars require smooth starts, precise stopping, and real-time load adjustments, which servo motors can easily meet, whereas asynchronous motors struggle to fulfill these demands.

Summary

Although asynchronous motors dominate many low-precision, high-power applications (such as fans, water pumps, and general transmission systems) due to their simple structure, lower cost, and ease of maintenance, servo motors clearly have advantages in high precision, high dynamic response, and energy-saving control.

For industries requiring precise motion control, energy optimization, and rapid response, such as industrial automation, stage machinery, robotics, precision machining, and medical equipment, servo motors are undoubtedly the more ideal choice. Their outstanding performance and long-term energy-saving benefits make them a mainstream trend in modern intelligent manufacturing and automation 

1. Abstract 
In modern stage environments—where extreme visual impact and uncompromising safety are required—the choice of drive technology directly sets the system’s performance ceiling. The three common drive solutions—induction (asynchronous) motors, stepper motors and servo motors—are not simply ranked by “better or worse,” but rather by their underlying technologies and matched application boundaries. This article provides professionals in the stage-machinery domain with a deep technical comparison, explains the core differences, and clarifies why servo-drive has become the unshakable foundation of premium stage automation.

2. Core Insights

1. Induction motor: A cost-effective, reliable power source. Ideal for start/stop, speed-control or constant-speed scenarios with no requirement for position control.

2. Stepper motor: A cost-efficient open-loop positioning solution. Performs well under low-speed, light-load conditions, but carries the risk of “step loss” and resulting cumulative position error when overloaded.

3. Servo motor: The industrial standard for high-performance motion control. Through closed-loop feedback, it enables high precision, high dynamic response, multi-axis synchronization and integrated safety functionality—making it the inevitable choice for complex and critical stage applications.

3. Fundamental Difference: Control Architecture
The core distinction among the three motor types lies in their control system architecture—how they execute a motion command and validate actual motion. That fundamentally determines accuracy and reliability.

1. Induction motor (open-loop power source)
   Operates by electromagnetic induction. Its speed is largely determined by supply frequency. The control mode is open-loop—once the command is given, the system cannot sense the actual execution result. This means although the motor runs continuously when powered, the system cannot verify or correct actual speed or position. It functions like a reliable power source—providing rotary motion—but lacks precise command-tracking and correction.
2. Stepper motor (open-loop positioner)
   The stepper divides a full revolution into a fixed number of incremental steps. Each command pulse causes the motor to advance one fixed step angle—an open-loop positioning mode. Its limitation lies in “step loss”: when the instantaneous load exceeds the motor’s torque, the rotor cannot follow the pulses, resulting in fewer actual steps than commanded. Because the system is open-loop, it cannot detect or compensate for this error, leading to an unrecoverable, cumulative deviation between actual position and commanded position.
3. Servo motor (closed-loop control system)
   A servo system comprises a motor, a high-resolution encoder (for real-time feedback of position and velocity) and an intelligent drive. “Closed-loop” means the system continuously compares the command with the actual result. The drive receives motion instructions and, using encoder feedback, dynamically adjusts motor output via control algorithms (e.g., PID) to eliminate any error between command and actual motion. This not only ensures very high positioning accuracy, but also gives the system the capability to handle load changes and execute complex motion profiles.

4. Deep Comparison of Key Performance Parameters

5. Why the Servo System Has Become Mainstream in Professional Stages
The spread of servo technology is not simply a pursuit of higher performance, but because its inherent characteristics fundamentally match the exacting demands of modern stage motion control.

a. Determinism: from “moving” to “precise moving”
Modern stage machinery is no longer satisfied with just “motion”; each motion must be precise, repeatable, predictable. A servo system allows programmers to treat physical motion like audio signals—fine-tuning trajectory, speed and timing for perfect repeatability. This level of control is beyond what open-loop systems can achieve.

b. Safety: proactive risk mitigation
In applications involving performer suspension or expensive equipment, safety is non-negotiable. Servo systems include real-time monitoring, fault diagnostics and adherence to international safety standards (such as SIL/PL), providing an active safety barrier—not just reactive detection. Induction or stepper systems cannot match this.

c. Efficiency defines commercial value
For touring productions, time equals money—deployment, commissioning and maintenance cost drive business results. Servo systems deeply integrate with modern control platforms (e.g., PC-based controllers), support offline programming, 3D simulation and remote diagnostics, compressing onsite commissioning from days to hours and massively reducing operational cost.

6. Scenario-Based Selection Strategy

1. Scenario A: Budget-sensitive, simple power-application

   • Technology: Induction motor + VFD

   • Example: Back-stage curtains, material handling, ventilation

   • Prerequisite: Must include mechanical limit stops and sensors as safety redundancy

2. Scenario B: Light-load, short stroke, low-speed positioning with high tolerance

   • Technology: Stepper motor system

   • Example: Small props, exhibition sliders, light-effect wheels

   • Key design point: Must implement “home” or reference-point routine to reset and clear cumulative error

3. Scenario C: High-precision, high-dynamic, high-safety, multi-axis sync critical application

   • Technology: Servo motor system

   • Example: Lift-rotate stages, performer flying systems, multi-point synchronized LED-screen hoist walls, large complex scenic mechanics

   • Decision basis: Whenever any requirement involves positioning accuracy, motion smoothness, multi-axis sync, dynamic response or integrated safety—servo system is the only viable technical solution. Its higher initial investment is returned through exceptional reliability, zero-error performance in show, and long-term operational efficiency.

7. YZ DITEC’s Servo-Solution Advantage
In modern stage machinery systems, safety, precision and stability are non-negotiable core indicators. YZ DITECdelivers full-spectrum stage systems with servo-driven solutions, covering closed-loop control, smooth motion, multi-machine synchronization and real-time monitoring.

Our systems are widely applied in touring stages, concerts, music festivals, theme parks, brand launches, auto shows, nightclubs, show rooms, theatres and TV-studio stages. We provide an integrated servo-system solution—from intelligent CNC stage chain hoist, lifting-rotating-sliding stages, LED screen group hoists, track-sliders to automation show control platforms. YZDITEC can customize design and system integration to match project scope, and seamlessly interface with show-control desks and 3D programming software for multi-axis synchronization and full-cycle safety monitoring. Choosing YZDITEC is not just selecting high-spec equipment—it is choosing system-level safety assurance and show-quality control. We help the stage evolve from “motion” to “motion under control”. With industrial-grade servo technology, every performance becomes more precise, more reliable and more outstanding.
👉 View our servo stage solutions & project case studies

8. Conclusion
Motor selection for stage machinery is a complex engineering-decision based on functional requirements, project budget and risk control.

1. Induction motors, with excellent cost-effectiveness, provide a robust solution for simple power-driven applications.

2. Stepper motors strike a compromise between cost and precision, suited to light-load positioning scenarios with controllable risk.

3. Servo motors, with their comprehensive superior performance and safety assurance, secure their irreplaceable position in critical stage applications, and represent the core direction of stage automation evolving from “mechanised” toward “digital and intelligent”.

Black Warrior System, developed by YZ DITEC, provides a comprehensive stage mechanic solution to control various stage elements which drive by servo motor with absolute encoder.

The Black Warrior System is a NEW CNC solution for servo motor machine, involves employing the precise and programmable motion capabilities of servo motors to automate and control various stage elements in one system.

              As a digital CNC control system, the Black-Warrior System integrates functions such as control, early warning, and safety. It ensures smooth operation with millimeter-level precision, even during complex geometric movements.

The Black Warrior System, typically comprises several integrated components to ensure smooth operation and control of stage elements during stage show performances or events. These components include the control system and drive machine. The control system includes Pando Software, BW-console, BW-MC, and BW-DC, and the drive machine include the stage mechanic drive by servo motor with absolute encoder.

Pando Software: A 3D simulation control software, provide offline simulation & 3D preview for stage show programming. This software enables operators to visualize and plan stage movements in a virtual environment before execution. It provides a realistic simulation of the stage setup, helping to identify potential issues and optimize performance sequences. What You See Is What You Get.

BW-console: An intelligent stage control console, serving as the central operation platform. BW-console is the control interface where operators can program, manage and execute stage movements and effects. It acts as the command center for the system, allowing precise adjustments and coordination with Linux operating system. The built-in Pando Software and touch screen make programming more intuitive and user-friendly, streamlining the process significantly.

BW-MC: Main control controller, is Central Control Unit of the Black Warrior System. The BW-MC serves as the intermediary between the stage console and the driver units. Equipped with a built-in safety control module, working in conjunction with the console and sub-control units to provide triple-layered operational safety assurance. BW-MC supports up to 128-loop network grouping, offering redundant connections and reliable transmission.

BW-DC: Drive Controller, the execution Units of the Main Controller. The BW-DC ensure a safe, stable, smooth, and synchronized drive system. Incorporating technology such as real-time monitoring systems, and precision control algorithms to enhance stage mechanic’s performance and reliability. Together with the software and main controller, it provides triple-layered operational safety assurance.

The execution unit of the Black Warrior System, is the stage mechanic drive by servo motor with absolute encoder. These are the physical mechanisms that carry out the commands, such as motors, winches, hoists, and other machinery, which are drive by servo motor with absolute encoder. They are responsible for stage motion like lifting, swing, sliding, and rotating.

Additionally, these components of all the Black Warrior System ensure that stage mechanics operate seamlessly, allowing for dynamic and creative performances while maintaining safety and precision.

Absolute Value Servo Motor Stage Machinery is a high-end stage drive system based on multi-turn absolute value encoder technology, specifically designed for mechanical devices that require high-precision positioning, power-off position memory, and rapid response in theaters, concerts, and live performances. By deeply integrating absolute value servo motors with stage machinery (such as lifting stages, rotating mechanisms, sliding trolleys, servo hoists and winch machine), it achieves millimeter-level positioning accuracy and motion without cumulative error under full closed-loop control. This completely eliminates the difficulty of traditional incremental encoders needing to return to zero repeatedly, ensuring absolute reliability and continuity in the performance process, making it suitable for high-demand, high-risk artistic presentation scenarios.

The stage machinery developed by YZ DITEC (including servo hoists, sliding trolley, winch machine, rotating stage and lifting stages) is centered around absolute value servo motors, pursuing greater safety, precision, and speed.

Core Functions and Advantages

1. Absolute Position Memory, No Need to Return to Zero

• Utilizes multi-turn absolute value encoders, permanently recording mechanical motor position information even after power loss. After restarting, there is no need for origin reset operations, avoiding delays caused by interruptions during performances or emergency power outages.
• Supports breakpoint continuation of position data, allowing for instant recovery to the state before the interruption after an unexpected shutdown, ensuring "zero tolerance" in the performance process.

2. Millimeter-Level Precision and Dynamic Response

• 23-bit high-resolution absolute value encoders (with a resolution of ±0.1mm), combined with adaptive disturbance resistance algorithms, achieve ultra-low tracking errors (±0.1mm) during high-speed motion (maximum speed of 5000 rpm).
• Full closed-loop control architecture compensates in real-time for backlash and deformation in the mechanical transmission chain (gearboxes, lead screws), eliminating precision degradation caused by long-term use.

3. Multi-Motors Coordination and Intelligent Safety

• Supports EtherCAT high-speed bus networking, allowing a single main controller to synchronize and drive up to 128 motors with a synchronization accuracy of ≤1μs, meeting the stringent timing requirements for multi-motors linkage in stage machinery (such as rotating and lifting composite actions).
• Features like over-limit emergency stop and overload prediction ensure the safety of performers and equipment.

Application Scenarios

• High-Precision Stage Positioning: Millimeter-level synchronization for theater lifting platforms and precise start-stop for rotating stages in concerts.
• Outdoor Complex Environments: Interference-resistant operation of water curtain machinery and wind and rain effect equipment in live performances.
• Rapid Scene Change Requirements: Instant reset and seamless switching for multi-act theatrical scenes.

Customer Value

• Zero Risk in Performances: Absolute value encoders eliminate position loss, preventing performance accidents caused by reset failures.
• Efficiency Improvement: Eliminates daily device zeroing time, shortening setup and rehearsal cycles.
• Long-Term Cost Optimization: Maintenance-free design reduces operational costs, and a lifespan of over 10 years decreases equipment replacement frequency.

Conclusion

·        Absolute Value Servo Motor Stage Machinery, with its uncompromising performance of no power loss, no return to zero, and exceptional reliability, redefines the standards of reliability in stage driving. Whether in theatrical performances that pursue artistic precision or in live shows that challenge environmental limits, this system provides stage machinery with "absolute control," ensuring that every movement is as precise as the first and that every performance is flawless.
Choose absolute value, choose absolute reliability!

·        Choose YZ DITEC, choose your safety stage machinery!

TÜV Rheinland’s C1 Standard (pertaining to stage machinery safety and technical specifications) is a globally recognized certification system in the performing arts industry. Its significance for stage performances is reflected in the following key dimensions:

1. Building the Foundation of Performance Safety

Mechanical Structural Safety Certification

• The C1 Standard rigorously tests load-bearing structures, drive systems (e.g., servo motors, transmission components), and braking mechanisms, ensuring ≤ 0.5mm error under rated load conditions.

• Example: The Berlin Philharmonic’s stage lift system, certified to C1, achieves 0.3mm precision when handling 30-ton loads, eliminating mechanical failures during performances.

Electrical Safety & Fire Protection

• Mandates overload protection, short-circuit isolation, and flame-retardant materials (e.g., UL94-V0 cables).

• Example: A London West End theater reduced electrical fire risks by 80%+ after upgrading to C1-compliant wiring.

2. Ensuring Precision in Performance Technology

Motion Control Accuracy Certification

• Requires ≤50ms dynamic response time and ±0.1mm positioning repeatability for servo systems.

• Example: Disney’s The Lion King stage turntable (C1-certified) performs 360° rotations in 1.5 seconds with flawless synchronization to actor movements.

Multi-Device Synchronization

• Standardizes DMX512/EtherCAT protocols to minimize signal delays (e.g., ≤20ms sync between lifts and spotlights at the Deutsche Oper Berlin).

3. Establishing Global Performance Standards

Compliance for International Tours

• Venues like NYC’s Metropolitan Opera and Paris Opera mandate C1 certification.

• Example: A Chinese dance troupe required C1-certified equipment for their Germany tour to gain venue access.

Industry Benchmarking

• Adopted by 40+ countries (e.g., Sydney Opera House reduced equipment failures from 12 to 3 annually post-C1 adoption).

4. Driving Sustainable Industry Growth

Energy Efficiency & Eco-Certification

• Mandates IE4-class servo motors (e.g., Siemens 1FK7), cutting energy use by 30%+.

• Example: London’s O2 Arena saved 150,000 kWh/year (equivalent to 8,000 trees’ CO₂ absorption) after C1 upgrades.

Lifecycle Management

• Requires predictive maintenance (vibration/temperature sensors) and 10+ years of parts support.

• Example: Hamburg’s Elbphilharmonie slashed maintenance costs by 40% via real-time C1 monitoring.

Conclusion: From "Safety Net" to "Artistic Enabler"

The C1 Standard transcends safety—it bridges technical precision and creative expression. As a Broadway producer noted:

"C1 certification lets designers imagine, technicians execute, and audiences witness the ‘impossible’ on stage."

Impact Summary:
✔ Safety: Sub-millimeter mechanical reliability
✔ Precision: Syncs automation with artistry
✔ Global Access: Unlocks international venues
✔ Sustainability: Cuts energy/maintenance costs