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A Method for Reducing Torque Ripple of Five-phase Internal Permanent Magnet Motor

A torque pulsation, permanent magnet motor technology, applied in the direction of magnetic circuit rotating parts, electric components, synchronous motors with stationary armatures and rotating magnets, etc.

Active Publication Date: 2020-06-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On this basis, the analysis limited to the cogging torque is far from enough

Method used

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  • A Method for Reducing Torque Ripple of Five-phase Internal Permanent Magnet Motor
  • A Method for Reducing Torque Ripple of Five-phase Internal Permanent Magnet Motor
  • A Method for Reducing Torque Ripple of Five-phase Internal Permanent Magnet Motor

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Embodiment Construction

[0092] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0093] 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.

[0094] A design method for low torque ripple of a five-phase embedded permanent magnet motor described in the present invention, the specific implementation objects are as follows figure 1 shown, including the following steps:

[0095] Step 1: Analyze the stator magnetomotive force of the target motor by analytical method, and obtain the stator magnetomotive force expression of the target motor according to the winding function of the target motor and the function of the applied excitation current. The specific calculation method is as follows:

[0096] like figure 2 As shown, the Fourier ...

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Abstract

The invention discloses a method for reducing the torque ripple of a five-phase embedded permanent magnet motor. According to the invention, a stator magnetomotive force model is established. An equivalent magnetic circuit diagram of the motor is extracted, and an odd harmonic part in the rotor magnetomotive force is converted into an even harmonic part according to the interaction principle between the stator magnetomotive force and the rotor magnetomotive force of the motor. In this way, the permanent magnet torque ripple is reduced. Meanwhile, an optimal extreme arc coefficient ratio underthe condition of an asymmetric magnetic pole structure is solved. On the basis of the asymmetric magnetic pole structure, the repeated units of a permanent magnet magnetic pole are determined. The angle of one-time offset is calculated, and a proper offset method is selected for carrying out the magnetic pole deviation. The performances of the reluctance torque and the cogging torque are reduced.According to the invention, the equivalent magnetic circuit method is used for analyzing and calculating an optimal extreme arc coefficient. Not only the optimal permanent magnet torque performance isobtained, but also the design period is shortened. By adopting the magnetic pole offset method, the pulsation of the output torque of the embedded motor is further reduced.

Description

technical field [0001] The invention relates to the design of a permanent magnet synchronous motor, in particular to a method for reducing the torque ripple of the permanent magnet synchronous motor, and belongs to the technical field of motor manufacturing. Background technique [0002] Because of the advantages of high torque density, high efficiency and wide speed range, embedded permanent magnet motors have been widely used in the fields of electric vehicles, aerospace and ship drives. With the wide application of embedded permanent magnet motors in many high-performance industrial fields, high requirements are put forward for the working stability of the motors, that is, the output torque ripple of the motors should be as small as possible, so as to achieve stable and accurate Thrust transmission, so research on reducing torque ripple is very valuable. [0003] At present, there are relatively in-depth researches at home and abroad on the suppression of torque ripple, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H02K21/14H02K29/03
CPCH02K1/2766H02K21/14H02K29/03
Inventor 陈前刘国海赵文祥林志鹏徐高红
Owner JIANGSU UNIV
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