Novel stator and rotor structure of surface-mounted permanent magnet motor

Abstract

The invention discloses a stator and rotor structure of a surface-mounted permanent magnet motor, which comprises a stator, a rotor, stator water holes, permanent magnets and permanent magnet auxiliary grooves. In order to output high torque and stably operate the motor, the structure adopts an inner rotor and outer stator mechanism, the inner rotor adopts a magnetic pole surface-mounted type, and the magnetic pole adopts two non-uniform permanent magnets, the inner side arc and the outer side arc are located on the same circle with the proportion of 6:5, auxiliary grooves are formed in magnetic poles, excitation windings are placed in inner stator winding grooves, and two round holes are formed in stator teeth to be connected with water pipes to facilitate heat dissipation of the motor. According to the invention, the asymmetric structure of the magnetic poles is used to reduce eddy current loss and optimize the air-gap flux density waveform, reduce magnetic leakage and enhance the sinusoidal property of the air-gap magnetic field; the permanent magnets are used for forming auxiliary slots to reduce cogging torque pulsation; and the purposes of reducing the waveform irregularity and controlling the temperature rise are achieved by using the water holes formed in the stator, so that the motor can operate more safely and stably.

Description

technical field [0001] The invention relates to the technical field of motor structure, in particular to the stator and rotor structure of a surface-mounted permanent magnet motor. Background technique [0002] Permanent magnet motors are more and more widely used because of their high efficiency, high output torque and simple structure. Using permanent magnets instead of electric excitation can meet the energy-saving requirements of projects. Permanent magnet motors are more and more widely used in permanent magnet motors. The requirements are higher, but because the permanent magnet surface-mounted motor has lower power density than the permanent magnet built-in motor, the cogging torque and eddy current loss are higher, so the temperature of the motor will rise and the torque output will be unstable, which limits the motor. development of. In order to adapt to the occasions of higher power density and high torque density, the motor needs to be improved. Contents of the...

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Problems solved by technology

[0003] The main content of the present invention is to provide a stator-rotor structure of a surface-mounted permanent magnet motor to solve the problem of low power density, high cogging torque and eddy current loss of the surface-mounted permanent magnet motor, which will cause the temperature of the motor to rise. The problem of unstable torque output

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