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Hollow-Shaft Motor MG-H79-31
Detail Information
MG-H79-31 Hollow-Shaft Motor
The MG-H79-31 is a high-precision hollow-shaft brushless servo motor designed for robot joints, precision rotary stages, optical equipment, and automated rotary mechanisms.It integrates a brushless motor, servo driver, 20-bit single-turn absolute encoder, and multiple communication interfaces into a compact housing. With dimensions of Ø79 × 32.6 mm and a weight of approximately 420 g, the motor delivers 1 N·m rated torque and up to 2.5 N·m peak torque, balancing torque density, positioning accuracy, and integration efficiency.
The MG-H79-31 features a Ø31 mm hollow bore for routing power cables, signal wires, optical fibers, or pneumatic lines through the rotation axis. It supports CAN FD, PWM, and RS485 interfaces, together with position, speed, and current/torque closed-loop control.
Product Advantages
Compact Ø79 mm Integrated Design
The MG-H79-31 has an outer diameter of 79 mm and an axial thickness of only 32.6 mm. Its flat hollow-shaft structure is easy to integrate into robot joints, precision rotary stages, and space-constrained equipment.The motor, driver, encoder, and communication interfaces are integrated into a single unit, reducing external control boards, mounting brackets, and connecting cables.
Ø31 mm Large Hollow Bore
The motor provides a minimum Ø31 mm hollow bore for routing power cables, communication wires, optical fibers, pneumatic lines, or mechanical components through the rotation axis.The large hollow passage simplifies internal cable routing and reduces interference from external wiring, making it suitable for robot joints, optical stages, laser scanners, and continuous rotary mechanisms.
2.5 N·m Peak Torque
The MG-H79-31 delivers 1 N·m rated torque and up to 2.5 N·m peak torque, supporting continuous rotation, position holding, rapid starts and stops, and short-duration high-load operation.Continuous current is below 1.5 A, while peak current can reach 10 A. Rated power is 54 W, with instantaneous power of up to 360 W for dynamic acceleration.
±0.004° Positioning Accuracy
The specified repeatability and absolute positioning accuracy are both ±0.004°, making the motor suitable for precision positioning and angle-control applications.Its speed variation rate is below ±0.5%, while the specified speed resolution is 0.0001 Hz, supporting smooth and stable low-speed operation.
20-Bit Absolute Encoder
The motor integrates a 20-bit single-turn absolute encoder, providing detailed angular feedback for position, speed, and torque control.The absolute encoder allows the controller to identify the single-turn rotor position at startup, reducing the need for conventional homing procedures.
Low-Noise, Low-Maintenance Operation
The specified operating noise is below 50 dB, making the motor suitable for laboratory equipment, optical instruments, service robots, and other noise-sensitive systems.
Technical Specifications
ParameterValue
ModelMG-H79-31
Configuration InterfaceRS485
Voltage Range36 VDC
Rated Torque1N·m
Peak Torque2.5N·m
Rated Power54W
Encoder Resolution20-Bit
CommunicationCAN FD/PWM
Protection RatingIP54
Weight (with driver)~420g
Repeatability±0.004°
Noise< 50 dB
Working Temperature-20 ~ +80 °C
Dual Encoder SupportYes (Output Shaft)
Custom Brake SupportYes
Key Applications
Humanoid Robots
Joint actuation for bipedal and full-body humanoid platforms
Collaborative Robots
Safe, precise motion for cobot arms and grippers
Exoskeletons
Power assist and rehabilitation exoskeleton systems
Education & Research
Robotics labs, university projects, and prototyping
Medical Assistants
Surgical robots and rehabilitation equipment
Smart Automation
Automated guided vehicles and smart manufacturing
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