What are the application and performance requirements of NdFeB Magnets in electric vehicles?

NdFeB  magnet is a high-performance, high-energy-density permanent magnet material that is widely used in electronics, machinery, instrumentation and other fields. In electric vehicles, NdFeB magnets are mainly used in key components such as permanent magnet motors, braking systems and sensors.
Permanent magnet motor: NdFeB magnets are characterized by their high magnetic properties, allowing the motor to be made smaller while maintaining high output power and efficiency. As the price of rare earth permanent magnets continues to decline, more and more automotive motors are beginning to use NdFeB rare earth permanent magnet materials. For permanent magnet motors, the high coercivity (Hc) and high remanence (Br) of NdFeB magnets are key factors to ensure the required magnetomotive force, rotational speed, output torque and high power for the motor output. At the same time, a high (BH)m (maximum magnetic energy product) indicates that the working coefficient of the permanent magnet in the motor is better. The larger the magnetic flux Φ, the higher the working efficiency of the motor.
Braking system: NdFeB magnets are also widely used in the braking system of electric vehicles. For example, in the braking system of large trucks or buses, NdFeB sintered magnets are installed, which increases the braking force accordingly, thereby ensuring the reliability of braking.
Sensor: Information from the rotational speed sensor on the tire axle is used to control the oil pressure through the ABS motor to transmit stable braking force to each tire to achieve safe parking. In this process, NdFeB magnets also play a key role.
For NdFeB magnets used in electric vehicles, the performance requirements mainly include the following points:
High magnetic performance: The magnet should have high coercivity, high remanence and high maximum magnetic energy product to ensure efficient operation of the motor and braking system.
Stability: The magnet should maintain stable magnetic properties in harsh environments such as high temperature and high humidity to ensure the safe and reliable operation of electric vehicles in various environments.
Corrosion resistance: The operating environment of electric vehicles is complex, and the magnets should have good corrosion resistance to extend their service life.
In general, NdFeB magnets are widely used in electric vehicles and their performance requirements are strict to ensure the safe and efficient operation of electric vehicles. With the continuous development of electric vehicle technology, the performance requirements for NdFeB magnets will continue to increase, promoting the continuous innovation and progress of magnet materials.