Electric actuator 25

rotaryservo-motorDC

Introduction
The large hollow-bore harmonic drive rotary actuator integrates a frameless internal-rotor torque motor with a Harmonic Drive reducer, absolute encoder and a customised large hollow-bore harmonic unit to form a compact, high-precision rotary actuator. The drive/control unit is typically externally mounted. Compared with standard rotary actuators, this series provides an increased through-bore diameter to accommodate lead screws, cables and other pass-through components, making it suitable for applications that require large through-hole space and compact integration.

Applications

• Machine tool rotary tables and indexing units
• Precision medical and laboratory devices
• 5-axis laser cutting and machining systems
• Semiconductor manufacturing equipment

Structural Characteristics

• Modular architecture with integrated high-resolution absolute encoders and intelligent power modules (IPM) for compact footprint and strong EMI resistance.
• Supports multiple control modes: position, speed and torque.
• Compatible with AC permanent-magnet synchronous motors and DC servo motors.

Control Algorithm

• Vector-based triple-loop control (current / speed / position) to optimise dynamic response, accuracy and stability.
• Complex control logic implemented on DSPs; supports networked communication and remote debugging.

Performance Highlights

• Micron-level positioning: high-resolution encoder feedback eliminates cumulative error and achieves sub-micron repeatability.
• Rapid response: low electromechanical time constant enables millisecond-level start/stop and direction reversal for high-frequency motion.
• Wide speed range: supports low-speed high-torque and high-speed light-load operation with speed ratio >1:5000.

Adaptability

• Compatible with standard industrial interfaces (EtherCAT, CANopen) for PLC and system integration.
• Built-in soft-start and overvoltage/overcurrent protection to reduce startup surges and failure risk.

Additional Features

• High-efficiency control with torque-dense design and regenerative braking achieving >90% energy efficiency.
• Full-digital control enabling response times <1 ms for complex motion trajectories.
• Safety redundancy with dual closed-loop verification (encoder + sensor) and on-board fault self-diagnostics.
• Environmental resilience: high-temperature components and dust-resistant coatings for operation from -20°C to 70°C.

Specifications (Product Parameters — AC-220V)

• Models: 25, 32, 40 — Reduction ratios available: 51, 81, 101, 121, 161.
• Rated Torque (N·m): 25: 68.5 / 107 / 133 / 133 / 133; 32: 133 / 206 / 264 / 267 / 267; 40: 242 / 351 / 460 / 557 / 557.
• Peak Torque (N·m): 25: 121 / 169 / 194 / 207 / 217; 32: 267 / 376 / 411 / 436 / 459; 40: 497 / 641 / 702 / 762 / 800.
• Rated Speed (RPM): 25: 49 / 31 / 25 / 21 / 16; 32: 45 / 28 / 23 / 19 / 14; 40: 39 / 25 / 20 / 17 / 12.
• Max Speed (RPM): 25: 94 / 59 / 48 / 40 / 30; 32: 90 / 57 / 49 / 38 / 29; 40: 80 / 51 / 41 / 34 / 25.
• Hollow Shaft Diameter (mm): 25: ø26; 32: ø35; 40: ø45.
• Mass (without brake, kg): 25: 3.6; 32: 7.4; 40: 10.7.
• Repeat Positioning Accuracy: ≤10 arcsec (all models); Unidirectional Positioning Accuracy: ≤60 / ≤50 / ≤50 / ≤40 / ≤40 (depending on configuration).
• Other motor parameters: phase resistance, inductance, back-EMF constants and rotor inertia vary by model (see detailed datasheet).
• Operating temperature: -20°C to 70°C. Notes: parameters are for reference and depend on configuration/options.