Direct-drive consequent-pole permanent magnet hub motor

Abstract

The invention discloses a direct-drive consequent-pole permanent magnet hub motor. The direct-drive consequent-pole permanent magnet hub motor comprises an inner stator, an outer stator and a consequent-pole rotor located between the inner stator and the outer stator; the inner stator and the outer stator are each formed by combining a plurality of stator modules; the consequent-pole rotor comprises a plurality of modularized iron cores, Spoke permanent magnets and surface-mounted permanent magnets, wherein the Spoke permanent magnets and the surface-mounted permanent magnets are alternately arranged, the Spoke permanent magnets are magnetized in the annular direction, and the surface-mounted permanent magnets are magnetized in the radial direction; positioning holes are formed in the modularized iron cores; non-magnetic pressing plates are arranged on the inner side and the outer side of the consequent-pole rotor; and the non-magnetic pressing plates are fixed with the positioning holes in the modularized iron cores through positioning bolts. According to the direct-drive consequent-pole permanent magnet hub motor of the invention, the problem of counter electromotive force even harmonic caused by asymmetric air gap flux density of the consequent-pole permanent magnet motor is solved, the counter electromotive force waveform quality of the motor is improved, the electromagnetic torque characteristic of the motor is improved, the problem of single-side magnetic leakage of a single-stator Spoke rotor structure is solved, and the permanent magnet utilization rate is improved.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a direct-drive alternating pole permanent magnet hub motor. Background technique [0002] Since the low-speed high-torque direct-drive motor eliminates the deceleration device and reduces the overall volume of the system, it has very broad application prospects in the fields of new energy electric vehicles, wind power generation, ship propulsion, and industrial production. In order to save rare earth permanent magnet materials, rare earth-less alternating pole permanent magnet motors have received extensive attention. However, for an alternating pole permanent magnet motor with an odd number of stator teeth such as 9 slots and 10 poles, the even harmonics in the air gap flux density will cause even harmonics in the phase windings. When the motor is connected to a three-phase AC Odd-order torque ripples will be larger, which will affect the quality of the electromagnetic torque ...

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 direct drive alternating pole permanent magnet hub motor to solve the air gap magnetic field of the alternating pole permanent magnet motor The even-order harmonic problem of the back EMF caused by density asymmetry can improve the quality of the back EMF waveform of the motor and improve the electromagnetic torque characteristics of the motor

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