MG-H28-4Hollow-Shaft Motor
group nameHollow-Shaft Motor
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Min Order1 piece
brand nameSolismotor Custom Robot Joint Drives
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update timeFri, 28 Aug 2026 11:03:42 GMT
Paramtents
Model MG-H28-4
Rated Torque 0.02N·m
Peak Torque 0.05N·m
Rated Power 9.6W
Encoder 12-Bit, Dual Support
Communication CAN / TTL Configuration
Protection IP54
Weight ~33.8g
Repeatability ±0.1°
Packging & Delivery
Min Order1 piece
Briefing
Detailed
MG-H28-4 Hollow-Shaft Motor
The MG-H28-4 is a compact hollow-shaft brushless servo motor designed for small robots, precision gimbals, smart knobs, and miniature motion systems. Within its compact Ø28.5 × 20.7 mm housing, it integrates a brushless motor, servo driver, and single-turn absolute encoder. Weighing approximately 33.8 g, it is ideal for applications requiring minimal size, low weight, and precise motion control.
The motor features a hollow-shaft design with a minimum through-bore diameter of Ø4 mm, allowing cables, signal wires, optical fibers, or other small components to pass through the rotation axis. This reduces interference from external wiring and enables cleaner system integration.
Product Advantages
Ultra-Compact and Lightweight
With an outer diameter of only 28.5 mm, a thickness of 20.7 mm, and a weight of approximately 33.8 g, the MG-H28-4 is easy to integrate into compact gimbals, desktop robots, optical instruments, and precision rotary mechanisms.Its flat, lightweight structure helps reduce actuator size and rotational inertia, improving system responsiveness.
Ø4 mm Hollow Bore
The motor provides a minimum Ø4 mm through-bore for routing cables, signal wires, optical fibers, or other small components through the rotation axis.This design reduces external cable interference and enables a cleaner, more compact mechanical layout.
Integrated Driver and Absolute Encoder
The MG-H28-4 integrates the servo driver and a 12-bit single-turn absolute encoder, reducing the need for an external driver, encoder board, and additional wiring.The absolute encoder provides direct single-turn position feedback, making it suitable for systems that require immediate position detection at startup and precise angular control.
±0.1° Positioning Accuracy
The motor provides a specified repeatability of ±0.1° and an absolute positioning accuracy of ±0.1°.Combined with closed-loop position, speed, and current control, it is well suited for gimbal positioning, miniature rotary stages, robotic end mechanisms, and precision angular-control systems.
0.05 N·m Peak Torque
The motor delivers a rated torque of 0.02 N·m and a peak torque of up to 0.05 N·m.Its rated power is 9.6 W, while instantaneous power can reach 48 W, providing a balance between continuous operation and short-duration dynamic acceleration in a compact package.
Low-Noise Operation
With a specified operating noise level below 50 dB, the MG-H28-4 is suitable for desktop equipment, optical instruments, laboratory devices, smart interactive products, and other noise-sensitive applications.
Technical Specifications
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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6YRS Hong Kong SolisMotor Co., Ltd.