Few-harmonic consequent-pole hub motor

Abstract

The invention discloses a few-harmonic consequent-pole hub motor, which comprises an outer permanent magnet rotor and an inner stator, wherein an air gap is formed between the outer permanent magnet rotor and the inner stator, the outer permanent magnet rotor comprises a non-magnetic assembly and a magnetic assembly located at the inner side of the non-magnetic assembly, the non-magnetic assembly and the magnetic assembly are assembled together through a connecting piece structure, the outer permanent magnet rotor comprises a plurality of annularly magnetized permanent magnets and radially magnetized permanent magnets, the annularly magnetized permanent magnets are spoke permanent magnets, the radially magnetized permanent magnets are surface-mounted permanent magnets, the annularly magnetized permanent magnets and the radially magnetized permanent magnets are alternately arranged one by one, the inner stator is composed of 3n stator modules, each stator module comprises nine stator teeth, and a three-phase armature winding is distributed on each stator module. The motor is simple in structure, not only has the magnetism gathering effect of a Spoke permanent magnet rotor structure, but also can eliminate even-order harmonics in counter electromotive force, and improves the electromagnetic torque quality of the motor.

Description

technical field [0001] The invention belongs to the field of hub motors, and in particular relates to a hub motor with less harmonics and alternating poles. Background technique [0002] High magnetic energy permanent magnet materials enable the motor to have the advantages of high torque density, high power density and high efficiency. In recent years, with the increase in the price of rare earth materials, permanent magnet motors with low rare earth alternating poles have received extensive attention. However, the alternating pole rotor structure will lead to air-gap flux density even-order harmonics, and improper selection of motor pole-slot coordination will induce back-EMF even-order harmonics in the armature winding, deteriorating the output electromagnetic torque performance of the motor. In order to reduce the influence of even-order harmonics of the air-gap magnetic density of alternating pole permanent magnet motors on the no-load back EMF waveform, the invention ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems mentioned in the above-mentioned background technology, the present invention proposes a less harmonic alternating pole hub motor to solve the problem of air gap flux density of alternating pole permanent magnet motor Even-order harmonic problem of back emf caused by asymmetry improves the electromagnetic torque characteristics of the motor

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