Stator and rotor structure of permanent magnet motor

Abstract

The invention discloses a stator and rotor structure of a permanent magnet motor, wherein the stator and rotor structure can enable the magnetic reluctance phase difference of a quadrature-direct axis magnetic circuit to become smaller and the magnetic flux leakage to be reduced. The structure comprises a stator core and a rotor core, wherein the stator core is provided with a plurality of stator grooves and stator teeth; a plurality of pairs of magnetic poles are uniformly distributed at the periphery of the rotor core; the bottom of each stator groove is composed of a circular arc and a linear which is connected at two ends of the circular arc, the ratio of the diameter of the circular arc to the outer diameter of the stator core is 0.7-0.74; the ratio of the difference between the outer diameter of the stator core and the outer diameter of circular arc of the stator core to the double value of the width of each stator tooth is 1.1-1.3; the rotor core is provided with magnetic grooves corresponding to the inner sides of the magnetic poles; two ends of each magnetic groove are respectively provided with a separated magnetic air gap, and the separated magnetic air gaps are communicated with the two ends of each magnetic groove; a plurality of strip-shaped magnetic bundle settling grooves are arranged between each magnetic groove and the corresponding outer end surface of each magnetic pole; and a groove is respectively arranged between two adjacent poles.

Description

technical field [0001] The invention relates to a permanent magnet motor structure, in particular to a stator and rotor structure of a permanent magnet motor. Background technique [0002] Permanent magnet motors are widely used in high-tech fields and people's daily life. According to different usage occasions of permanent magnet motors, people are constantly improving and improving the performance of permanent magnet motors and the manufacturing process of permanent magnet motors. [0003] In the traditional stator and rotor manufacturing process of permanent magnet motors, due to the traditional design theory, traditional manufacturing process and material factors, the ratio of the mechanical geometry and some important mechanical dimensions is not very reasonable, so the following problems arise: [0004] 1. In the stator, due to the unreasonable distribution of the tooth yoke, the magnetic circuit is uneven, which causes the stator to heat unevenly, which makes the torq...

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Problems solved by technology

[0004] 1. In the stator, due to the unreasonable distribution of the tooth yoke, the magnetic circuit is uneven, which causes the stator to heat unevenly, which makes the torque ripple of the permanent magnet motor larger, which affects the improvement of the efficiency of the permanent magnet motor;

[0005] 2. In the rotor, the NdFeB permanent magnet is inserted into the rotor core. Since the magnetic permeability of the permanent magnet is close to that of the air, the reluctance of the rotor's orthogonal and direct axis magnetic circuit has a large difference (that is, the salient pole of the motor is relatively large. ), resulting in larger motor torque ripple and larger noise; permanent magnets with this structure have more magnetic flux leakage, which reduces the utilization rate of permanent magnets

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