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Permanent magnetic DC motor commutation torque ripple harmonic wave analysis method

A permanent magnet brushless DC, phase torque technology, applied in the direction of torque ripple control, electronic commutation motor control, electrical components, etc., can solve the problem of reducing torque ripple, large error, unable to give torque ripple and Problems such as the harmonic relationship of back electromotive force, to achieve the effect of expanding the scope of application

Inactive Publication Date: 2017-08-18
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there are still relatively few literatures on the study of commutation torque ripple from the perspective of harmonics.
Since the back electromotive force and phase current of the motor cannot be ideal, calculating the torque ripple of the motor with the ideal back electromotive force and phase current will inevitably cause a large error
In addition, the traditional calculation method of torque ripple cannot give the relationship between torque ripple and back EMF harmonics and current harmonics, so it cannot provide measures to reduce torque ripple

Method used

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  • Permanent magnetic DC motor commutation torque ripple harmonic wave analysis method
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  • Permanent magnetic DC motor commutation torque ripple harmonic wave analysis method

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Embodiment Construction

[0042] The present invention provides a harmonic analysis method for commutation torque ripple of a permanent magnet brushless DC motor. The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The specific implementation steps of the present invention are as follows:

[0043] 1. Taking two-phase conduction star three-phase six states as an example, the motor is in the advanced commutation mode. figure 1 The control circuit diagram and the equivalent circuit model of the brushless DC motor in the case of advanced commutation are given. Therefore, the three-phase stator winding voltage balance equation can be established as:

[0044]

[0045] where u a ,u b ,u c is the phase voltage of the three-phase winding; i a ,i b ,i c is the phase current of the three-phase winding; L is the equivalent inductance of the stator; e a ,e b ,e c is the three-phase electromotive force; R is the phase resistance of the t...

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Abstract

The invention relates to a permanent magnetic DC motor commutation torque ripple harmonic wave analysis method. The permanent magnetic DC motor commutation torque ripple harmonic wave analysis method comprises steps of solving phase current under a leading condition according to phase voltage of the permanent magnetic brushless DC motor, obtaining a changing rate at the moment the current is turned on according to the obtained current, performing harmonic wave decomposition on phase current and a back electromotive force, obtaining 6 time harmonic wave and 12 time torque harmonic wave according to a relation between the torque and the back electromotive force and the phase current and using a harmonic wave amplitude to define a torque ripple coefficient.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet brushless DC motor control, and in particular relates to a commutation torque ripple and harmonic analysis method. Background technique [0002] Permanent magnet brushless DC motor (PMBLDCM) is widely used in various fields of industry and life due to its advantages of high power density, small size, simple drive and high reliability. Electromagnetic torque is an important performance index of PMBLDCM, and the quality of torque performance directly affects the range of use of the motor. For PMBLDCM, due to the existence of winding inductance, the phase current cannot change abruptly, so the phase current lags behind the back electromotive force, and finally causes the commutation torque ripple. Compared with permanent magnet synchronous motor (PMSM), PMBLDCM has more serious torque ripple, which not only affects its wide application, but also may lead to motor damage and accidents in sev...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P6/182
CPCH02P6/10H02P6/182
Inventor 李斌李桂丹姬艳鹏
Owner TIANJIN UNIV
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