Core Technology Analysis and Application Features of Rare Earth Permanent Magnet Brushless Motors for Robots
Core Materials
⑴ Advantages Of Rare Earth Permanent Magnet Materials
NdFeB permanent magnets, as core components, have a magnetic energy product density 10 times that of ordinary magnets, significantly improving the motor's power density and torque output.
A single humanoid robot consumes 2-4 kg of NdFeB material (for example, each joint motor requires more than 40 motors, with each motor using 50-100 grams of magnet material).
⑵ Innovation In Brushless Motor Architecture
Brushless motors utilize electronic controllers (ESCs) instead of mechanical brushes, completely eliminating wear and spark risks, extending their lifespan to tens of thousands of hours, and achieving efficiency exceeding 95%.
Typical applications include frameless torque motors (for high-precision torque output in rotary joints) and coreless motors (for rapid extension and retraction control in linear joints).
Performance Advantages
High Dynamic Response and Precision
Rare earth permanent magnets achieve millisecond-level response and joint control accuracy of ±0.1%, making them suitable for complex humanoid robot movements (such as grasping and walking).
Torque density is increased by 40%, and output torque exceeds that of traditional motors by 30% within the same volume, meeting the demand for lightweight robots.
Breakthroughs in Energy Efficiency and Endurance
Energy conversion losses are reduced by 20%, and motor efficiency exceeds 95%, significantly extending robot endurance (for example, drone endurance is increased by 20%-30%).
Application Progress
Humanoid Robot Core Drive
Using a combination of 28 frameless motors and 34 coreless motors, the system uses 4.5kg of rare earth permanent magnet material per unit, enabling precise control of complex movements.
Technical Challenges
Material Temperature Resistance Bottleneck
Deep-well robots require magnetic steel that can withstand temperatures of 150°C, while the current material limit temperature is approximately 200°C (for samarium cobalt permanent magnets).
Cost Optimization
Rare earth price fluctuations impact mass production, necessitating the development of low-heavy rare earth formulas (e.g., dysprosium and terbium reduction technology).
Honor And Qualification
The company holds over 80 patents and 18 provincial-level industrial new products. It is certified to ISO9001 for quality, ISO14001:2015 for environmental, and ISO45001 for occupational health. Its products are certified to China 3C, US UL, Canadian CUL, Australian SAA, and EU CE and ROHS.
Application Areas
Textile Industry
① Motors for circulation fans in textile printing and dyeing machines.
② Motors for textile texturing machines.
Industry and Energy
① Mining/Steel Mill Equipment: Single units with power up to 260kW, cascading to MW-class, suitable for direct-drive systems.
② Breeze Power Generation: Low wind speed start-up (force 3) with a wide high-efficiency range, suitable for small and medium-sized wind turbines.
High-End Equipment
① Robotic Joints: High torque density and precise control, supporting integrated harmonic reduction design.
② Aerospace: Lightweight and high power density meet the requirements of drones and electric aircraft.
Case
Case 1
- Location: Daqing Oilfield
- Motor Model: JNPM520-30-255
- Key Parameters:
- Power: 30 kW
- Torque: 1,123 N·m
- Speed: 255 RPM
Case 2
- Location: Daqing Oilfield
- Motor Model: JNPM290-30
- Power: 30kW
- Torque: 286N ·m
- Speed: 1000 RPM
Case 3
- Location: Production equipment for textile printing and dyeing factories
- Motor Model: JNPM173-7.5
- Key Parameters:
- Power: 7.5kW
- Torque: 49 N·m
- Speed: 1450 RPM
The company is committed to building its brand. Through years of hard work, its "Weidi" trademark has been recognized as a "Famous Trademark of Zhejiang Province" and its "Weidi" brand motors have been designated as "Famous Brand Products of Hangzhou." The company has also been recognized as a "Science and Technology Enterprise of Zhejiang Province," a "Patent Demonstration Enterprise of Zhejiang Province," a "Made-in-Zhejiang Product," a "Specialized, Specialized, and Innovative Enterprise of Zhejiang Province," a "National High-Tech Enterprise," and a "National Intellectual Property Advantage Enterprise." It also has established a provincial-level enterprise research institute.
The company actively leverages customer support and its own efforts to continuously improve product quality, enhance product visibility and reputation, and further develop its expertise, strength, and scale in the high-end equipment and smart home motor industries.
FAQ
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