The disc-type permanent magnet motor (also known as an axial flux permanent magnet motor) is an innovative motor type that utilizes an axial magnetic field structure. Its core feature is its high power density and compact design achieved through an axial air gap magnetic flux path.
Core Structure and Operating Principle
Axial Flux Design
Unlike traditional radial motors, the stator and rotor of a disc-type motor are arranged in a disc shape. The air gap plane is perpendicular to the rotating axis, and the magnetic field lines are parallel to the rotating axis, forming an axial magnetic field. Typical structures include:
• Intermediate Rotor-Dual Stator (S-R-S): The rotor is placed between two stators, balancing magnetic pull, ensuring high assembly precision, and excellent heat dissipation.
• Intermediate Stator-Dual Rotor (R-S-R): The stator is centered, with two rotors on either side. This design is suitable for an ironless structure, but offers poor heat dissipation.
• Coreless Rotor: The windings are encapsulated in a composite material, eliminating iron loss and cogging, resulting in smoother torque output.
Magnetic Circuit and Material Innovations
Using high-performance neodymium iron boron permanent magnets, magnetic field strength is increased by over 30%, significantly optimizing magnetic energy utilization.
The ironless design completely eliminates eddy current and hysteresis losses, improving efficiency by 8%-12%.
Technical Advantages
High Power Density and Torque Performance
The disc-type structure increases the rotor diameter, increasing torque output by 30%-40% compared to similarly sized radial motors. Even at low speeds (10 rpm), it can deliver millions of Newton meters of torque.
The gearless direct-drive design reduces transmission losses, achieving a torque density 15 times that of traditional motors.
High Energy Efficiency
The elimination of the iron core reduces losses, resulting in an efficiency exceeding 90% at rated operation and an efficiency fluctuation of less than 5% over a wide load range.
Rare earth permanent magnet materials increase unit power density, resulting in overall energy savings of 15%-30%.
Dynamic Response and Reliability
The moment of inertia is reduced by 50%, improving response speed and achieving speed control accuracy of ±0.1%. The brushless structure eliminates mechanical wear and withstands shock and vibration up to 10 times the acceleration of gravity.
Heat Dissipation and Lightweighting
Multi-channel forced air cooling (such as the patented T1-T5 air ducts) combined with hollow shaft ventilation solves the heat dissipation challenges of coreless structures.
Composite materials reduce weight by 30%-50% and improve power-to-weight ratio by 40%.
Typical Application Scenarios
New Energy and Transportation
• Electric Vehicle Hub Motors: Leverage high torque density for direct drive.
• Electric Aircraft/UAVs: Lightweight and high efficiency meet aviation power requirements.
Industrial Equipment
• Wind Turbines: Low starting wind speeds (<1m/s) and high conversion efficiency make them suitable for vertical axis units.
• Oil Drilling Equipment: Large disc motors, such as the PA series, replace induction motors to improve the energy efficiency of drilling platforms.
Precision Control
• Industrial Robots: No cogging ensures torque stability and supports high-precision motion.
• Servo Systems: Fast dynamic response meets the positioning requirements of CNC machine tools.
Technology Evolution
Integrated Intelligent Control
Built-in CAN/RS485 interfaces enable IoT remote monitoring.
Adaptation for Extreme Environments
Developing 150°C high-temperature-resistant magnets to expand deep-shaft mining applications.
Multi-disc Composite Structure
Further improving torque density through axial stacking (requires overcoming complex assembly bottlenecks).
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
Hot Tags: disc magnet motors, China disc magnet motors manufacturers, suppliers, factory, 3 phase permanent magnet motor, Brushless DC Electric Motor for Robotics , DC Brushless Motor for Drones, Disc Magnet Motors, neodymium magnet motor, rare earth magnet motor
