Rotor structure and rotor assembly of surface-mounted permanent magnet synchronous motor

Abstract

The invention belongs to the technical field of surface-mounted permanent magnet synchronous motors, in particular to a rotor structure and a rotor assembly of a surface-mounted permanent magnet synchronous motor. The rotor structure comprises a rotor punching sheet and a magnetic steel arranged on the rotor punching sheet; a plurality of magnetic steels are uniformly distributed on the circumferential surface of the rotor punching sheet, and a shaft hole is formed in the middle of the rotor punching sheet; the bottom of each magnetic steel is a cambered surface, and the circle center of eachcambered surface and the center of the shaft hole are eccentrically arranged. The rotor assembly comprises a plurality of rotor structures which are axially stacked and arranged. According to the rotor structure and the rotor assembly of the surface-mounted permanent magnet synchronous motor, the cogging torque of the motor can be effectively reduced, winding harmonic waves and tooth harmonic waves are reduced, the torque fluctuation of the motor is reduced to a great extent, the vibration noise of the motor is reduced, and the operation stability is improved.

Description

technical field [0001] The invention belongs to the technical field of a surface-mounted permanent magnet synchronous motor, in particular to a rotor structure and a rotor assembly of a surface-mounted permanent magnet synchronous motor. Background technique [0002] New energy vehicles are more and more popular with the public due to their environmental protection advantages. The auxiliary drive systems used in the internal vehicle air compressors and steering systems have more requirements for drive motors: high reliability, high performance, high Adaptability, while pursuing low cost, low weight, high response speed, etc. [0003] The surface-mounted permanent magnet synchronous motor (SPM) attaches the magnetic steel to the surface of the rotor core, and strengthens the magnetic steel by covering the surface of the magnetic steel with a stainless steel sleeve or winding carbon fiber (so that it will not be invalidated by centrifugal force), surface-mounted Permanent mag...

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Problems solved by technology

[0004] There are mainly two types of rotor structures for existing surface-mounted permanent magnet synchronous motors: one type of magnetic steel has both inner and outer surfaces as arcs, and the radius of the arc on the inner surface is greater than the radius of the arc on the outer surface to form a middle thick double The cross-sectional shape of the end gradually becomes thinner. Although this structure can effectively reduce the torque fluctuation and positioning torque, thereby reducing the vibration noise, but this structure causes a large waste of magnetic steel materials and high cost; another surface-mounted magnetic steel, The center of the inner arc and the outer arc of the magnetic steel are at the same point, and coincide with the center of the shaft hole. The radius of the outer arc is greater than the radius of the inner arc, and the thickness of the magnetic steel is equal. This structure has large torque fluctuations and is prone to vibration noise

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