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Torque ripple weakening method for concentrated winding outer rotor magnetic field modulation motor

A technology of torque pulsation and magnetic field modulation, which is applied to control generators, control electromechanical brakes, control electromechanical transmissions, etc. Torque ripple and the effect of improving torque performance

Active Publication Date: 2020-08-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing research experience shows that there are several problems in the magnetic gear motor: (1) cost problem
However, due to the asymmetry of the air gap flux density under the magnetic poles, the introduced even-order harmonics make the back EMF of the motor asymmetric, resulting in a large torque ripple

Method used

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  • Torque ripple weakening method for concentrated winding outer rotor magnetic field modulation motor
  • Torque ripple weakening method for concentrated winding outer rotor magnetic field modulation motor
  • Torque ripple weakening method for concentrated winding outer rotor magnetic field modulation motor

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Embodiment Construction

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0038]The present invention proposes a method for suppressing torque ripple of a concentrated winding outer rotor magnetic field modulation motor based on rotor axial segmentation. The objective function of the wave is used to find the best combination of coefficients to weaken the high-order harmonics of the back EMF. At the same time, combined with the structure of the axial segment of the rotor, the even harmonics in the back EMF can be reduced, thereby reducing the torque ripple of the motor.

[0039] Such as figure 1 As shown, the top...

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Abstract

The invention discloses a torque ripple weakening method for a concentrated winding outer rotor magnetic field modulation motor, and the method employs a method of building a target function to adjusta modulation polar coefficient combination and rotor axial segmentation for inhibition for main odd harmonics and even harmonics in the counter electromotive force of the motor. According to the method, the reduction of motor torque ripple is taken as an objective function, and an optimal modulation polar coefficient combination is obtained through a method of combining analytical calculation anda finite element method so as to suppress the influence of main odd harmonics. A rotor of the concentrated winding magnetic field modulation motor is divided into two sections in the axial direction,permanent magnets of the two sections are magnetized with N polarity and S polarity respectively, and the upper permanent magnet and the lower permanent magnet are arranged in a staggered mode by thedistance of one pole so as to restrain the influence of even harmonics. The torque ripple suppression method is easy to operate and obvious in effect, and the concentrated winding outer rotor magnetic field modulation motor has the advantages of being high in torque density and low in torque ripple.

Description

technical field [0001] The invention relates to a torque pulsation weakening method of a concentrated winding outer rotor magnetic field modulation motor, which belongs to the technical field of motor body design and analysis. Background technique [0002] In-wheel motor technology, also known as in-wheel motor technology, is characterized by the integration of power, transmission and braking devices into the wheel hub, thus greatly simplifying the mechanical parts of electric vehicles. In order to reduce the size of the motor, solve the friction and noise problems caused by the reducer, and increase the power density, magnetic gear structures and magnetic field modulation permanent magnet hub motors have been proposed one after another. Unlike mechanical gears, magnetic gears transmit energy through a magnetic field, and there is no direct contact between the two parts, thus avoiding the problems of mechanical contact. However, due to the low efficiency and torque density ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/14H02K1/16H02K1/27H02K3/28H02P6/182H02P21/05
CPCH02K1/14H02K1/165H02K1/2786H02K3/28H02P6/182H02P21/05
Inventor 樊英梅叶依杨灿
Owner SOUTHEAST UNIV
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