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Product IntroductionLarge hollow bore rotary actuators typically combine a frameless torque motor with an internal rotor and components such as a harmonic reducer, absolute encoder, and a specialized large hollow bore harmonic drive, forming a complete rotary actuator assembly. Its control unit (drive system) is usually installed externally, enabling high-precision motion control for connected equipment. Compared to standard rotary actuators, this series features a larger hollow bore diameter, allowing the passage of lead screws, cables, and other components. They are designed for applications requiring large through-hole space, high precision, and compact integration, such as rotary tables for machine tools, precision medical instruments, 5-axis laser cutting systems, and semiconductor equipment.Design FeaturesModular design with integrated high-precision encoders and intelligent power modules (IPM), ensuring compact size and high resistance to electromagnetic interference.Supports multiple control modes (position/speed/torque) and is compatible with permanent magnet synchronous motors and DC servo motors.Control AlgorithmVector triple-loop control (current/speed/position) optimizes accuracy and dynamic response stability.Implementation of complex control logic via digital signal processors (DSP) with support for network interaction and remote debugging.Key CharacteristicsMicron-level positioning: high-precision encoder feedback eliminates error accumulation, ensuring submicron repeatability.Fast response: low electromechanical time constant enables start/stop or direction change within milliseconds, ideal for high-frequency movements.Wide speed range: supports low-speed operation with high torque and high-speed operation with light load, with a regulation range over 1:5000.AdaptabilityCompatible with standard interfaces (e.g., EtherCAT, CANopen) for easy integration with PLC/systems.Built-in soft start circuits and overvoltage/overload protection reduce inrush currents and failure risks.AdvantagesHigh-efficiency control: Compact design with high torque and regenerative braking ensures efficiency >90%.Excellent dynamics: Fully digital control provides response time <1ms for complex motion trajectories.Safety redundancy: Dual-loop verification (encoder + sensor) and self-diagnosis guarantee reliability.Environmental resistance: High thermal resistance components and dustproof coating support operation from -20°C to 70°C.SpecificationsProduct Parameters (AC-220V)Model253240Reduction Ratio/518110112116151811011211615181101121161Rated TorqueN·m68.5107133133133133206264267267242351460557557Peak TorqueN·m121169194207217267376411436459497641702762800Rated SpeedRPM493125211645282319143925201712Max SpeedRPM945948403090574938298051413425Rated CurrentA3.903.843.833.202.405.825.685.834.933.78.727.978.378.466.36Max CurrentA6.906.075.584.973.9211.6910.369.088.046.3617.9114.5512.7511.589.13Constant TorqueN·m/Arms17.5427.8634.7441.6255.3822.8536.2945.2554.2172.1327.7444.0654.9465.8287.58Unidirectional Positioning AccuracyArcsec≤60≤50≤50≤40≤40≤60≤50≤50≤40≤40≤60≤50≤50≤40≤40Repeat Positioning AccuracyArcsec≤10≤10≤10≤10≤10≤10≤10≤10≤10≤10≤10≤10≤10≤10≤10Tilt StiffnessX104N·m/rad3895175Torsional StiffnessX104N·m/rad3.44.67.69.91418.6Motor Phase ResistanceOhm (20°C)3.550.880.8Motor Phase InductancemH106.18Back EMF ConstantVrms/Krpm404044Rotor InertiaWithout brake kg·m²2.1*10^-48.3*10^-41.64*10^-3Rotor InertiaWith brake kg·m²2.2*10^-41.04*10^-32.05*10^-3Weight (without brake)kg3.67.410.7Motor PolesPole161616Diameter & Length (with/without brake)mmø116mmX109mmø126mmX109mmø142mmX138.7mmø170mmX150.7mmHollow Shaft Diametermmø26 mmø35 mmø45 mmNotesFor reference, actual parameters should be confirmed with sellersBrand: HonpineCategory: Large Hollow Bore Harmonic Drive Rotary Actuator