Application Of NdFeB Permanent Magnets In New Energy Vehicles

At present, NdFeB has been widely used in various fields, such as robots, industrial motors, household appliances, earphones, etc. Today we will introduce the application of NdFeB permanent magnets in new energy vehicles. New energy vehicles mainly include hybrid vehicles and pure electric vehicles. High-performance NdFeB permanent magnet materials are mainly used in drive motors of new energy vehicles. Drive motors suitable for new energy vehicles mainly include permanent magnet synchronous motors, AC asynchronous motors and switching magnetic among them, the permanent magnet synchronous motor has become the mainstream motor because of its wide speed range, high power density, small size, and high efficiency. NdFeB permanent magnets have the characteristics of high magnetic energy product, high intrinsic coercive force and high remanence, which can effectively improve the power density and torque density of motors, and are widely used in permanent magnet motor rotors.

EPS (Electric Power Steering System) is the component that uses the most permanent magnets (0.25kg/vehicle) in addition to the drive motor. The power-assisted micromotor in EPS is a permanent magnet motor, which has high requirements for performance, weight and volume. Therefore, the permanent magnet materials in EPS are mainly high-performance sintered or hot-pressed NdFeB magnets.

In addition to the driving motor of new energy vehicles, the motors on the rest of the car are all micro-motors. Micro-motors have low requirements on magnetism. At present, ferrite is the main one. However, the efficiency of motors using NdFeB is increased by 8-50%. The power consumption is reduced by 10% and the weight is reduced by more than 50%, which has become the development trend of micro motors in the future.

For example, various sensors on cars are a scene where NdFeB permanent magnets are applied to new energy vehicles. The sensors that use permanent magnets mainly include: distance sensors, brake sensors, seat belt sensors, etc. They mainly use Hall sensors. In Hall sensors, permanent magnets are used to generate magnetic fields to make Hall elements generate offset currents, thereby generating electromotive force, with the miniaturization and integration of Hall sensor development, the selection of permanent magnets tends to use NdFeB permanent magnets with good magnetic properties and small size.

Car speakers are also another scene where NdFeB permanent magnets are applied to new energy vehicles. The performance of permanent magnets has a direct impact on the sound quality of speakers. The higher the magnetic flux density of permanent magnets, the higher the sensitivity of the speakers and the better the transient. Generally speaking, it is the speaker It is easy to make a sound, and the sound is not muddy. The permanent magnets of speakers on the market mainly include AlNiCo, ferrite and NdFeB. The magnetic properties of NdFeB are far superior to those of AlNi and ferrite. Especially for high-end speakers, most of them use NdFeB.

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