Combination magnetic pole type build-in tangential permanent magnet synchronous motor

Abstract

The invention provides a combination magnetic pole type build-in tangential permanent magnet synchronous motor, and belongs to the field of permanent magnet motors. The invention solves problems that harmonics exist in an air-gap magnetic field of a rare earth permanent magnet synchronous motor driven by sine waves, and partial irreversible demagnetization is prone to occur. The permanent magnet synchronous motor comprises a rotor and a stator. The rotor comprises a plurality of rotor poles and a rotor core, the plurality of rotor poles are uniformly distributed on a circumferential direction of the rotor core, and each rotor pole is vertically embedded within the stator core along a radial direction; the rotor pole comprises a rare earth permanent magnet pole and a ferrite permanent magnet pole; the ferrite permanent magnet pole is close to the air-gap side, and an internal end surface of the ferrite permanent magnet pole is combined with an external end surface of the rare earth permanent magnet pole; and both magnetization directions of the rare earth permanent magnet pole and the ferrite permanent magnet pole are parallel magnetization, and the magnetization directions are the same and are both perpendicular to the radius. The permanent magnet synchronous motor of the structure enables the air-gap magnetic field to contain a smaller number of harmonics, thereby improving motor efficiency; and moreover, ferrite permanent magnet materials are cheap, thereby reducing costs.

Description

technical field [0001] The invention relates to a combined magnetic pole type rotor structure, which belongs to the field of permanent magnet motors. Background technique [0002] With the increasingly serious problems of the environment and energy crisis, high-efficiency and energy-saving electrical equipment has become a development trend, which greatly promotes the development of high-power-density, high-efficiency rare earth permanent magnet synchronous motors. However, the price of rare earth permanent magnet materials has remained high, and rare earth permanent magnet motors are greatly affected by price fluctuations of rare earth permanent magnet materials, so the cost of rare earth permanent magnet motors is also affected. The development space of magnetic synchronous motor. Moreover, rare earth materials are non-renewable resources, and excessive use of rare earth materials in motor systems will also cause damage to the environment. Therefore, under the premise of...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of harmonics and partial irreversible demagnetization in the air-gap magnetic field of rare earth permanent magnet synchronous motors driven by sine waves, especially at high temperatures, the irreversible demagnetization of permanent magnet materials will lead to the decline of motor performance , providing a combined pole type built-in tangential permanent magnet synchronous motor

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