In recent years, with the rapid development of the new energy vehicle industry, significant technological breakthroughs have been achieved in the application of permanent ferrite materials in this field. These technological breakthroughs not only enhance the performance and efficiency of new energy vehicles, but also reduce costs and promote the sustainable development of the industry.
1.The development of high-performance permanent ferrite materials
The development of high-performance permanent ferrite materials is the key to the technological progress of new energy vehicle motors. The performance of permanent ferrite materials has been significantly improved through methods such as ultrafine grinding of rare earth additives and microwave calcination of precalcined materials. For instance, the microwave sintering technology developed by Shanghai Institute of Technology has successfully established a complete microwave sintering process. The performance of sintered magnets is close to that of the FB9 series, and their strength is superior to that of traditional sintered magnets. This high-performance material not only meets the requirements of magnetic tiles for permanent magnet DC motors in new energy vehicles, but also expands its application in downstream industries such as home appliances and speakers.
2. Innovation in the integration of permanent magnets and magnetoresistance
In the motors of new energy vehicles, the optimization of permanent magnet synchronous motors and reluctance motors is the focus of current technological development. For instance, Toyota's newly developed "bipolar magnetic circuit rotor" has increased the magnetic energy product by 10% and reduced the use of rare earths by 20% through magnetic circuit optimization. In addition, the BMW iX3 adopts a permanent magnetic-assisted synchronous magnetoresistive solution, which increases the proportion of magnetoresistive torque to 60%, achieving a system efficiency of 92% while reducing the reliance on rare earths.
3. Development of rare earth-less and rare earth-free permanent magnet motors
To reduce reliance on rare earth resources, the research and development of rare earth-less and rare earth-free permanent magnet motors has become a hot topic in the industry. For instance, the design of the combined excitation external rotor permanent magnet motor proposed by the S. Ishii team from Tohoku University in Japan combines rare earth permanent magnets with ferrites. This not only reduces the amount of rare earth used by 50% but also significantly improves the torque performance. In addition, the W. Kakihara team significantly enhanced the motor's anti-demagnetization capability by adopting a spoke rotor structure with magnetic clustering function and increasing the amount of ferrite used.
4. Multi-layer V-shaped magnetic steel layout and laser welding process
To suppress the eddy current loss during high-speed operation, a certain brand has applied a five-layer V-shaped magnetic steel embedding technology, reducing the generation of eddy currents through multi-segment magnetic pole division. In combination with the laser welding process, the bonding strength between the rotor core and the magnetic steel has been increased by 30%, ensuring the reliability of the 200KW-class motor under extreme working conditions.
5. Application of Axial Flux motors
Axial flux motors have gradually been applied in new energy vehicles due to their small size and high efficiency. For instance, the axial flux design of YASA reduces the volume by 50% compared to radial motors and is compatible with 800V high-voltage platforms. The promotion of this motor technology will further enhance the performance and energy efficiency of new energy vehicles.
6. The development of electromagnetic and thermal coupling technology
The development of electromagnetic thermal coupling technology provides an effective solution to the heat dissipation problem of permanent magnet motors in new energy vehicles. For instance, the magnetic steel cooling structure developed by Jingzhou Shengqi Magnetic Industry Co., Ltd. has enhanced the heat dissipation, stability and reliability of the motor through heat pipes and phase change materials. The application of this technology will effectively extend the service life of the motor and improve the overall performance of the vehicle.
The breakthrough in permanent ferrite technology in new energy vehicles not only enhances the performance and efficiency of motors but also reduces the reliance on rare earth resources, promoting the sustainable development of the industry. In the future, with the continuous advancement of technology, permanent ferrite materials will play a more significant role in the field of new energy vehicles, contributing to the further development of the new energy vehicle industry.
