Permanent magnet synchronous motor rotor structure applied to novel electric vehicle

Abstract

The invention discloses a permanent magnet synchronous motor rotor structure applied to a novel electric vehicle. According to the invention, on a permanent magnet synchronous motor with 4 pairs of poles and 48 slots and uniform air gap spacing, a regular polygon is established based on the circle center of the rotor punch of the permanent magnet synchronous motor; R1 is greater than R2, where R1is the radius of the rotor punch of the permanent magnet synchronous motor, and R2 is the radius of the regular polygon; the center point of the rotor of the permanent magnet synchronous motor is theorigin, and the center point of the vertical line from the origin to the edge of the octagon is a dot; the arc with the radius from the dot to the nearest octagon vertex is the outer contour of the rotor punch of a new permanent magnet synchronous motor; the origin is used as the center and R3 is used as the radius to make a circle and superimpose the circle and the outer contour of the rotor punch of the new permanent magnet synchronous motor to acquire the rotor structure. According to the invention, non-uniform air gaps are used, so that the air gap magnetic density is in sinusoidal distribution; the harmonic content is reduced; the radial force wave is well improved; and the vibration and noise of the permanent magnet synchronous motor are reduced.

Description

Technical field [0001] The invention belongs to the field of permanent magnet synchronous motors for electric vehicles; specifically, it relates to a new permanent magnet synchronous motor rotor structure that optimizes the radial force waveform of the permanent magnet synchronous motor. Background technology [0002] In recent years, with the gradual implementation of electric vehicle industry policies and people's increasing concern for environmental and energy issues, electric vehicles have gradually been chosen by more and more consumers. Permanent magnet synchronous motors have the advantages of high efficiency, high speed and high power density, and have become the first choice for permanent magnet synchronous motors for vehicles. Currently, most of the domestic market uses permanent magnet synchronous motors as power sources. [0003] Although permanent magnet synchronous motors have significant advantages, since electric vehicles do not have roaring engine noise, the...

AI Technical Summary

Problems solved by technology

In the case of a uniform air gap, the air gap magnetic density of the rectangular permanent magnet synchronous motor presents a trapezoidal distribution. This magnetic density distribution has a large harmonic content, which will generate serious radial force harmonics and cause motor vibration and vibration. Noise, affecting the NVH characteristics of the vehicle

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