Combined magnetic pole type built-in radial linear permanent magnet synchronous motor

Abstract

A combined magnetic pole type built-in radial linear permanent magnet synchronous motor belongs to the field of a permanent magnet motor, and aims to solve the problems that a harmonic wave easily occurs in an air gap magnetic field of a rare earth permanent magnet synchronous motor driven by a sine wave and local irreversible demagnetization occurs easily. The combined magnetic pole type built-in radial linear permanent magnet synchronous motor comprises a rotor and a stator, one or multiple layer of linear permanent magnet mounting grooves are uniformly and circumferentially distributed in a rotor core, a rotor magnetic pole is disposed in each mounting groove, and each mounting groove extends in an axial direction; each rotor magnetic pole comprises a rare earth permanent-magnet magnetic pole and two ferrite permanent-magnet magnetic poles; the left and right end faces of each rare earth permanent-magnet magnetic pole are respectively provided with the one corresponding ferrite permanent-magnet magnetic pole, and the rare earth permanent-magnet magnetic pole and the two corresponding ferrite permanent-magnet magnetic poles form continuous linear magnetic pole structure; and the magnetizing directions of each rare earth permanent-magnet magnetic pole and the corresponding two ferrite permanent-magnet magnetic poles are parallel and same. The permanent magnet synchronous motor having structure enables a harmonic wave content of the air gap magnetic field to be reduced, and improves motor efficiency; and price of a ferrite permanent magnetic material is low, so cost is lowered.

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 magnetic pole type built-in radial inline permanent magnet synchronous motor

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