Planetary Gear Motor GMP28
The GMP28 Planetary Gear Motor is a compact 28 mm-class 12 VDC planetary gear motor designed for applications requiring high torque density, stable low-speed output, and a coaxial drive layout. The supplied reference models cover 1:11.2, 1:126, and 1:264 gear ratios, with rated speeds from 23.5 to 760 RPM and rated torque from 0.06 to 1.5 N·m. Its compact planetary transmission is suitable for robot joints, grippers, AGV/AMR mechanisms, industrial actuators, smart devices, and other space-constrained motion systems. Final selection should be based on target speed, continuous and peak torque, allowable current, duty cycle, backlash, and installation requirements.
Product Overview
The GMP28 Planetary Gear Motor is a compact 28 mm-class 12 VDC planetary gear motor designed for applications requiring high torque density, stable low-speed output, and a coaxial drive layout. The supplied reference models cover 1:11.2, 1:126, and 1:264 gear ratios, with rated speeds from 23.5 to 760 RPM and rated torque from 0.06 to 1.5 N·m. Its compact planetary transmission is suitable for robot joints, grippers, AGV/AMR mechanisms, industrial actuators, smart devices, and other space-constrained motion systems. Final selection should be based on target speed, continuous and peak torque, allowable current, duty cycle, backlash, and installation requirements.
Model Information
| Series | Motor Type | Product Category |
| GMP28 | PMDC Motor | Planetary Gear Motor |
Main Parameters
Gearmotor Technical Data
| Model | Ratio | Rated Voltage | No-load Speed | No-load Current | Rated Speed | Rated Current | Rated Torque | Stall Current | Stall Torque |
| GMP28M365-126K | 1:126 | 12 VDC | 90 RPM | ≤260 mA | 72 RPM | ≤720 mA | 0.36 N·m / 3.6 kgf·cm | ≤2800 mA | 1.8 N·m / 18 kgf·cm |
| GMP28M385-11.2K | 1:11.2 | 12 VDC | 885 RPM | ≤200 mA | 760 RPM | ≤750 mA | 0.06 N·m / 0.6 kgf·cm | ≤4800 mA | 0.45 N·m / 4.5 kgf·cm |
| GMP28M395-264K | 1:264 | 12 VDC | 28 RPM | ≤180 mA | 23.5 RPM | ≤500 mA | 1.5 N·m / 15 kgf·cm | ≤2350 mA | 6.0 N·m / 60 kgf·cm |
Dimension Drawing
Main Applications
AI Robots
Robot joints, wheel drives, grippers, dexterous-hand mechanisms, mobile chassis, and other compact mechanisms requiring higher torque density.
Focus: Evaluate continuous torque, peak torque, reverse impact, backlash, temperature rise, and feedback requirements.
Industrial Automation
Small robot joints, AGV/AMR wheel drives, electric fixtures, tightening tools, and precision positioning mechanisms.
Focus: Axial/radial shaft load, start-stop frequency, bearing life, backlash, and duty cycle should be verified.
Smart Home
Electric curtains, window openers, lifting mechanisms, and other compact actuators requiring stable low-speed output and adequate load capability.
Focus: Match ratio to required action time and torque; validate noise and position repeatability in the complete mechanism.
Automotive Electronics
Seat adjustment, powered tailgate, door-drive and similar compact actuator mechanisms.
Focus: Frequent reversing, peak load, vibration, temperature variation, backlash, and feedback configuration should be evaluated.
Medical Equipment
Rehabilitation equipment, precision adjustment mechanisms, medical robots, and other compact drive modules requiring stable output.
Focus: Low noise, low vibration, repeatability, life consistency, and interface requirements should be validated at system level.
Smart Agriculture & Gardening
Mower wheel drives, pruning-tool mechanisms, picking actuators, and lifting/adjustment structures.
Focus: Consider slope, shock load, dust, moisture, vibration, shaft sealing and outdoor protection at system level.
Commercial & Office Equipment
Coffee-machine mechanisms, cash-handling equipment, ticketing terminals, automatic pickup mechanisms and similar compact drives.
Focus: High-cycle operation should be tested with the real load profile, including current, temperature rise, noise and backlash change.
Customization Range
Electrical Configuration
Rated voltage and motor selection based on target speed, torque, current, and duty cycle.
Performance Matching
Gear ratio, output speed, continuous / starting / peak torque, current limit, and load margin.
Mechanical Interface
Output shaft shape and length, mounting flange, gearbox length, bearing configuration, and installation interface.
Feedback Options
Hall sensor or encoder configuration can be evaluated according to speed, position, or stall-detection requirements.
Backlash / Noise Optimization
Gear precision, assembly fit, lubrication, speed matching, and complete-product resonance can be evaluated.
Reliability Validation
Frequent start-stop, reverse impact, temperature rise, axial/radial load, vibration, shock, and application-specific life cycle.
FAQ
Q1. What applications are planetary gear motors best suited for?
Planetary gear motors are ideal for applications that require high torque density, compact size, stable transmission, and relatively low backlash. Typical applications include robot joints, grippers, AGV/AMR wheel drives, medical devices, automotive actuators, smart home mechanisms, and industrial automation equipment.
Q2. How should I choose the gear ratio and output torque?
The gear ratio should be selected based on the required output speed, load torque, motor speed, operating time, and duty cycle. A ratio that is too low may not provide enough torque, while an excessively high ratio may reduce output speed and increase transmission stages, noise, cost, and mechanical losses. Continuous, starting, and peak torque should all be evaluated during selection.
Q3. Can planetary gear motors be used for precision positioning?
Yes. Planetary gear motors can be designed with controlled backlash and combined with encoders or Hall sensors for position and speed feedback. However, final positioning accuracy also depends on gearbox backlash, sensor resolution, mechanical stiffness, assembly tolerances, and the control algorithm, so system-level validation is recommended for precision applications.
Q4. How do you evaluate reliability and service life?
Reliability should be validated under the customer’s actual operating conditions, including load, start-stop frequency, reversing cycles, temperature, shock, vibration, and duty cycle. Key performance items such as speed, current, torque, temperature rise, noise, backlash, and gear wear can be monitored during life testing.
Q5: How do I place an order with Shunli Motor?
Please send us your application requirements or motor specifications. Our engineering team will develop a suitable solution, confirm the technical details, and provide samples for evaluation. Once the samples are approved, we will arrange mass production. Shipping methods can be selected based on your delivery requirements.
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Whether you're in the product concept, prototype development, or mass production phase, Shunli Motors can help you find the right micro geared motor drive solution based on your specific application needs.
Submit your product requirements now and get selection advice from our engineers.
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