A three-phase permanent magnet motor with the same pole and the same slot

Abstract

The invention discloses a three-phase permanent magnet motor with the same pole and the same slot. The permanent magnet motor includes a stator and a permanent magnet rotor. The stator includes a plurality of stator slots. The permanent magnet rotor is concentrically arranged in the stator and includes a plurality of permanent magnets. The number of stator slots is equal, the stator slots include the first stator slot and the second stator slot of different slot types, the number of stator slots of each slot type is Z=3n, n is a positive integer ≥ 1; the first stator slot The corresponding permanent magnet exhibits a number of poles P for the air gap 1 =Z+k 1 , the pole-slot fit is P 1 Pole Z slot, the permanent magnet corresponding to the second stator slot has the number of magnetic poles shown by the air gap as P 2 =Z‑k 1 , the pole-slot fit is P 2 Pole Z slot, and k 1 It is a positive integer ≥ 1. The permanent magnet motor of the invention has lower power supply frequency and iron loss, higher efficiency, higher torque density, and is beneficial to reduce load torque fluctuations.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and in particular relates to a three-phase permanent magnet motor with the same pole and the same slot. Background technique [0002] In order to reduce the torque fluctuation of the permanent magnet motor, there are mainly three methods on the motor body: 1) Changing the parameters of the permanent magnet. Changing the parameters of the permanent magnet mainly includes changing the shape of the permanent magnet, changing the pole arc coefficient, changing the placement position of the permanent magnet, the oblique pole, and the segmentation of the magnetic steel. 2) Change the armature parameters. There are mainly ways to change the armature parameters such as chute, opening auxiliary slot, and changing the slot width. 3) Reasonable pole-slot coordination, reasonable selection of the number of poles and slots can increase the fundamental frequency of the cogging torque of the m...

AI Technical Summary

Problems solved by technology

[0003] However, the pole-slot coordination of traditional permanent magnet motors adopts different number of slots / number of poles. In this way, when a motor with many poles and few slots is used, the power supply frequency and iron loss of the motor will be greater, and the distributed winding with few poles and multiple slots has a lower Power supply frequency and iron loss, but the winding end is long, the copper loss is low, and the cogging torque is large. The back EMF waveform of the motor: the back EMF waveform of the motor with few poles and many slots tends to be a trapezoidal wave, and the back EMF waveform of a motor with many and very few slots tends to be a triangular wave. These are not conducive to the reduction of motor torque ripple

According to the slot electromotive force star diagram and the slot pitch angle formula, the traditional permanent magnet motor with the same pole and the same slot has only 0° and 180° due to the uniform distribution of the slots, which cannot form a multi-phase winding distribution.

Images