A Low Torque Ripple High Efficiency Permanent Magnet Motor Stator-Rotor Structure

Abstract

The invention relates to a stator and rotor structure of a low-torque pulsation and high-efficiency permanent magnet motor, comprising a stator and a rotor. The outer circle of the rotor is composed of several four-segment arcs, and several slots for embedding permanent magnets are arranged on the rotor. The permanent magnet slot is a V-shaped slot with a flat bottom, a wedge-shaped slot for preventing the movement of the permanent magnet is arranged on the top of the left and right slots of the V-shaped slot, and the permanent magnet is embedded in the left and right slots. Reinforcing ribs are arranged between the tops of adjacent flat-bottomed V-shaped grooves. Compared with the existing built-in V-shaped permanent magnet motor, the invention reduces the flux leakage of the permanent magnet, improves the utilization rate of the permanent magnet, increases the salient pole effect, makes full use of the reluctance torque, and improves the efficiency and power of the motor Density; improved air gap magnetic density waveform, reduced cogging torque and torque ripple, effectively reduced core loss and eddy current loss.

Description

technical field [0001] The invention relates to a stator-rotor structure of a permanent magnet motor, in particular to a permanent magnet motor with a "V"-shaped permanent magnet built in the rotor, which is suitable for applications such as compressors, air conditioners, electric tools and electric vehicles, and belongs to the technical field of motors. Background technique [0002] With the development of rare earth permanent magnet materials, permanent magnet motors are more and more widely used in various fields of national economy. Since the permanent magnet brushless motor has remarkable characteristics such as high efficiency, high power density, and high reliability, and has a variety of structural designs, the optimal design of the permanent magnet motor structure can maximize efficiency and other performance. [0003] The built-in V-shaped permanent magnet motor is a common built-in permanent magnet motor. Its working principle is: the rotating magnetic field gener...

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Problems solved by technology

[0003] The built-in V-shaped permanent magnet motor is a common built-in permanent magnet motor. Its working principle is: the rotating magnetic field generated by the electric excitation of the stator winding interacts with the magnetic field generated by the built-in permanent magnet in the rotor to make the rotor rotate; because the permanent magnet Embedded in the rotor, the permanent magnets are surrounded by ferromagnetic materials, which can easily lead to magnetic flux leakage between the poles. When the motor rotates, the air gap waveform will be distorted, and its radial component will cause vibration between the stator and the rotor, and lead to a decline in the inherent performance of the motor.

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