The so-called permanent magnet refers to the addition of permanent magnets when manufacturing the motor rotor to further improve the performance of the motor. The so-called synchronization means that the speed of the rotor and the current frequency of the stator winding are always consistent. Therefore, by controlling the input current frequency of the stator winding of the motor, the speed of the electric vehicle will finally be controlled. How to adjust the current frequency is a problem to be solved by the electronic control part.
Permanent Magnet Motors have a higher power/mass ratio, smaller size, lighter weight, greater output torque than other types of motors, and the motor's limit speed and braking performance are also relatively excellent, so permanent magnet synchronous motors have become The most widely used electric motor in electric vehicles today. However, when the permanent magnet material is subjected to vibration, high temperature and overload current, its magnetic permeability may be reduced, or demagnetization phenomenon 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 the manufacturing cost is not stable.
Permanent Magnet Synchronous Motor
Permanent magnet synchronous motors are gradually being widely used in industry and agriculture. In the past ten years, due to the emergence and use of new technologies, new processes and new devices, the excitation method of Synchronous Motors has been continuously developed and improved. In terms of automatic adjustment of excitation devices, many new types of adjustment devices have been continuously developed and promoted. At present, many countries are developing and experimenting with a digital auto-regulating excitation device composed of a microcomputer and corresponding external equipment. This kind of adjustment device will be able to achieve the best adaptive adjustment.
In industrial and agricultural production, a large number of production machinery of permanent magnet synchronous motors require continuous operation in one direction at a roughly constant speed, such as fans, pumps, compressors, and ordinary machine tools. The permanent magnet synchronous motor has low cost, simple and reliable structure, convenient maintenance, and is very suitable for driving this type of machinery.
Of course, with the advantages of permanent magnet synchronous motors, the majority of new energy automobile manufacturers prefer permanent magnet synchronous motors, which are also widely used in elevators.
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