An asymmetric butterfly built-in permanent magnet synchronous motor

Abstract

The invention relates to an asymmetric butterfly type built-in permanent magnet synchronous motor, which comprises a double-layer permanent magnet, a magnetic isolation bridge, a magnetic isolation barrier and a rotor core, wherein the magnetic isolation barrier angles of the permanent magnet under different polarity poles are designed into different shapes, namely, the magnetic isolation bridge structure of the magnetic pole under the same polarity is symmetrical, and the magnetic isolation bridge structure of the magnetic pole under the different polarity polarity is asymmetrical; The size of magnetic barrier under one pole is smaller than that under the other pole, which increases the magnetoresistive torque and decreases the harmonic density of air gap without increasing the permanentmagnet. The motor has advantages that: 1) The magnetic barrier angle of permanent magnet under different magnetic poles is designed to be asymmetrical, which is similar to butterfly wings. The magnetic barrier under one pole is short wings, and the magnetic barrier under the other pole is long wings, the motor has the advantages of high magnetoresistive torque proportion and high torque density; 2) harmonic content of the magnetic density of the air gap is reduced and low torque ripple is achieved, 3) simple process and convenient fabrication are achieved.

Description

technical field [0001] The invention is an asymmetric butterfly type built-in permanent magnet synchronous motor, which belongs to the technical field of permanent magnet synchronous motors. Background technique [0002] The built-in permanent magnet synchronous motor is more and more widely used in the field of aviation electric drive due to its advantages of strong low-speed overload capability and wide operating range of high-speed constant power. The most typical built-in structures are single-layer inline and V-shaped. These two single-layer built-in high-speed permanent magnet synchronous motor structures contain a large amount of air gap flux density because the air gap flux density is close to trapezoidal rather than sinusoidal the lower harmonics. These low-order harmonics make the torque ripple larger and the noise of the motor larger when the motor is running at a low speed. When running at high speed and weak field, the loss of the stator core increases and the...

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Problems solved by technology

[0004] The present invention proposes an asymmetric butterfly-shaped built-in permanent magnet synchronous motor. Moment density, low torque pulsation double-layer built-in permanent magnet synchronous motor rotor, designed to increase the proportion of reluctance torque, thereby increasing the average torque output of the motor

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