Application of Rare Earth Permanent Magnet in New Energy Automobile

NdFeB magnets are widely used in automobile motor, servo motor wind turbines, robot, and the elevator, air conditioning, speakers, etc.

Rare earth magnet is widely used in the new energy vehicle market, the quality of magnet affected by the model, the design idea and other various aspects of the automobile.

Since the outer ring of permanent magnets, the rotor will, therefore, operate as provided on the outer side of the stator. Typically a rotor of new energy automobile has a generator stator combination use, and this serves as the outer ring of the rotor.

new energy automobile

More than 30 parts of general motors vehicle use rare earth permanent magnet, and there are more than 70 parts of luxury cars need to use rare earth permanent magnet materials, a fully automatic advanced car need about 0.5 kg – 3.5 kg.

NdFeB magnets rare earth permanent magnet material on new energy vehicles, each hybrid electric vehicle (HEV) to use more 5 kg of neodymium magnet than the traditional car; Pure electric vehicles (EV), rare earth permanent magnet motor has replaced the traditional generator.

All the above permanent magnets can be used on magnetic coupling and magnet rotor. But neodymium iron boron is the most widely used magnetic material due to high magnetic energy product (BHmax) and intrinsic coercive force. When under high working temperature (above 200 degrees Celsius), you can use SmCo magnet which can reach 250 to 300 degrees Celsius.

 

What is A Magnet Rotor Made of

Magnetic motor rotor is formed by magnetic steel, metal shaft or metal shell. According to detailed application situation, the rotor magnet can be sintered, molded or injection molded with NdFeB magnet material and Ferrite magnet material with multi-poles magnetic rings. It can be used for the high-speed motor, line motor, stepper motor, etc.

With the increasing performance of permanent magnet materials, rare earth permanent magnet materials are widely used in electrical fields. Using high-performance rare earth permanent magnet materials to make a motor, the structure does not require special electrical excitation system, which helps to improve motor efficiency and power factor, and save energy, reduce the size of the motor.

magnets rotor
Currently, in the design of permanent magnet motor, the general assumption that a uniform distribution of the various parts of the magnetic field of the permanent magnet and the magnetic properties of the same batch of permanent magnets can be the same, while the need to use a permanent magnet demagnetization curve of permanent magnet at room temperature under suppliers, intrinsic connectivity magnetic parameters, residual magnetism, such as density and maximum energy product.

However, since the manufacturing process and the level of the plant and other reasons, there is a temperature in each portion of a permanent magnet hereinafter actual performance differences and the performance of the same group of permanent magnets is different.

The magnetic properties of the permanent magnet

permanent magnet motor in normal operation can be closely related to the magnetic rotor, permanent magnet motor can directly determine whether reliable operation.

When the permanent magnet motor is running, sometimes leaving the rotor temperature higher NdFeB irreversible demagnetization phenomenon, causing permanent magnet synchronous motor efficiency and power factor and other performance indicators deteriorated.

Furthermore, a permanent magnet motor rotor can be customized by different kinds of magnetic materials, and custom drawing is welcomed.

NdfeB Magnets for Electrical Fields

With the increasing performance of permanent magnet materials, rare earth permanent magnet materials are widely used in electrical fields.
Using high-performance rare earth permanent magnet materials to make a motor, the structure does not require special electrical excitation system, which helps to improve motor efficiency and power factor, and save energy, to reduce the size of the motor.

electrical motor
Currently in the design of permanent magnet motor, the general assumption that a uniform distribution of the various parts of the magnetic field of the permanent magnet and the magnetic properties of the same batch of neodymium magnets can be the same, while the need to use a permanent magnet demagnetization curve of permanent magnet at room temperature under suppliers, intrinsic connectivity magnetic parameters, residual magnetism, such as density and maximum energy product.

However, since the manufacturing process and the level of the plant and other reasons, there is a temperature in each portion of a permanent magnet hereinafter actual performance differences and the performance of the same group of permanent magnets is different.

The magnetic properties of the permanent magnet
The permanent magnet motor in normal operation can be closely related to the magnetic permanent magnet.
The strong magnet motor can directly determine whether reliable operation.
When the permanent magnet motor is running, sometimes the rotor temperature is high and NdFeB irreversible demagnetization will happen, causing permanent magnet synchronous motor efficiency and power factor and other performance indicators deteriorated.