External Rotor Motor

Shenzhen HengDrive Technologies Co., Ltd. is one of the most reliable manufacturers and suppliers of external rotor motor in China. With abundant experience, we warmly welcome you to wholesale bulk external rotor motor made in China here from our factory. We also accept customized orders.

Characteristic: CW & CCW, Signal function available, Locked rotor protection, Stepless speed regulation, Low noise, Low EMI, Long life 3000-15000hrs

Notice: Data in this typical specification sheet are for other certain customer. Voltage, rated torque, speed, current, power and shaft extension feature & dimension can be changed to meet customer specific requirement.

Performance Curve :

Our external rotor motor feature a rotating outer housing with permanent magnets, while the stator remains stationary inside. This design delivers high torque at lower speeds with excellent heat dissipation and a compact axial profile. Operating at 12V–72V, they offer torque from 0.2 Nm to 8 Nm and speeds from 1,000 RPM to 8,000 RPM. Ideal for direct-drive applications such as electric scooters, e-bikes, fans, blowers, drones (multi-rotor propulsion), pumps, robotics wheels, and home appliances.

• High torque density: Large-diameter rotor with high-grade neodymium magnets delivers exceptional low-speed torque without requiring a gearbox (direct-drive capability).
• Compact axial length: External rotor design allows for very short axial profiles (as low as 25mm), ideal for space-constrained integrations.
• Excellent heat dissipation: Stator is mounted on a central heatsink or housing flange, while the rotating outer shell acts as a heat sink – reducing thermal resistance.
• Smooth & quiet operation: Precision-balanced rotor and optimized magnetic circuit achieve low cogging torque and <50dB noise for noise-sensitive environments.
• High efficiency: ≥88% efficiency across a wide operating range, with low iron losses for extended battery life in portable applications.
• Durable construction: Sealed bearings (IP54–IP67 optional), stainless steel shaft, and moisture-resistant coatings for outdoor or dusty conditions.
• Sensor options: Available with Hall sensors, magnetic encoders, or sensorless configuration for cost-sensitive applications.
• Customization: Multiple KV ratings, shaft diameters, mounting flanges, integrated propeller hubs, and custom lead connectors.
• Production capacity: 450,000 units/month with 5–7 week lead time for custom windings or mechanical interfaces.

• ISO 9001:2015 (quality management)
• IATF 16949:2016 (process reliability)
• ISO 14001:2015 (environmental)
• RoHS, REACH, CE, UKCA
• EMC compliant – EN 55014-1 / CISPR 14-1
• IP54–IP67 (optional)
• UL 1004 (optional for North America)

Choose our external rotor motor for direct-drive applications demanding high torque, compact size, and certified reliability. Contact us for technical datasheets or sample evaluation.

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