A pole-changing and speed-expanding permanent magnet synchronous motor

Abstract

The invention discloses a pole-changing and speed-increasing permanent magnet synchronous motor. The pole-changing and speed-increasing permanent magnet synchronous motor comprises a stator and a rotor, wherein the stator comprises a stator core and a stator winding, the stator winding is used for providing magnetic fields with a plurality of pole pairs, the rotor comprises a rotor core and magnetic poles arranged on the rotor core, the widths of the magnetic poles are different, and the polarities of the magnetic poles are N poles and S poles and are arranged at intervals; the rotor is used for providing magnetic fields with a plurality of pole pairs, the magnetic potentials of the magnetic fields provided by the rotor are different, and the pole pairs of the rotor and the pole pairs of the stator are in a one-to-one correspondence manner; when the pole-changing and speed-increasing permanent magnet synchronous motor works, in the magnetic field with one pole pair just provided by thestator winding, the magnetic field provided by the stator winding is coupled with the magnetic field with the same pole pairs provided by the rotor, and the higher the rated speed of the pole-changing and speed-increasing permanent magnet synchronous motor, the lower the harmonic content of the magnetic field participating coupling is, so that the magnetic field of the rotor in a high speed rangeis weakened, the counter electromotive force is reduced, then the flux weakening current is reduced, and the performance of the motor is not reduced while the speed is increased.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, and more specifically relates to a permanent magnet synchronous motor with pole changing and speed expansion. Background technique [0002] my country is rich in rare earth resources. The reserves of rare earth ores are about four times that of other countries in the world. The output of rare earth ores and rare earth permanent magnets ranks among the top in the world. At the same time, my country's research on rare earth materials and rare earth permanent magnet motors has reached the international advanced level. Therefore, giving full play to the advantages of rare earth resources, vigorously researching and promoting the application of various permanent magnet motors represented by rare earth permanent magnet motors has important theoretical significance and practical value for our country. Compared with traditional motors, permanent magnet motors are simple in st...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a permanent magnet synchronous motor based on pole-changing and speed expansion. Technical problems that lead to reduced motor performance

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