The permanent magnet synchronous motor has a higher power/mass ratio, smaller size, lighter weight and larger output torque than other types of motors, and the motor's limiting speed and braking performance are also excellent.Therefore, the permanent magnet synchronous motor has become the most commonly used motor in today's electric vehicles.

　　However, when the permanent magnet material is subjected to vibration, high temperature and overload current, its permeability may decrease, or demagnetization may occur, which may reduce the performance of the permanent magnet motor.

　　In addition, rare-earth permanent magnet synchronous motors use rare-earth materials, and their manufacturing costs are unstable.

　　Permanent magnet synchronous motors are gradually widely used in industrial and agricultural fields.In the past ten years, due to the emergence and use of new technologies, new processes and new equipment, the excitation method of permanent magnet synchronous motors has been continuously developed and improved.In terms of the automatic adjustment of the excitation device, many new types of adjustment devices are constantly being developed and promoted.

　　At present, many countries are developing and testing microcomputers with digital auto-regulating excitation devices composed of corresponding external equipment.The adjustment device will achieve the best adjustment of self-adaptation.

　　Application of Permanent Magnet Synchronous Motor

　　In the permanent magnet synchronous motors produced in industry and agriculture, mass production machines need to operate continuously at a substantially constant speed in one direction, such as fans, pumps, compressors, and ordinary machine tools.

　　Permanent magnet synchronous motors have low cost, simple and reliable structure, and convenient maintenance, making them very suitable for driving such machines.

　　Of course, with the advantages of permanent magnet synchronous motors, most new energy automobile manufacturers prefer permanent magnet synchronous motors, which are also widely used in elevators.

　　The advantages of permanent magnet synchronous motors are unmatched by ordinary motors, so today's automobile and elevator industries are widely used.