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Multi-phase permanent magnet motor open-circuit fault torque ripple suppression method

An open-circuit fault and torque ripple technology, applied in torque ripple control, motor generator control, AC motor control, etc., can solve problems such as control hysteresis

Pending Publication Date: 2022-07-22
QINGDAO UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The embodiment of the present invention provides a multi-phase permanent magnet motor open-circuit fault torque ripple suppression method to solve the problem of control hysteresis after an open-circuit fault of a multi-phase permanent magnet motor in the prior art

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Embodiment Construction

[0051]The following description and drawings sufficiently illustrate the specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of the embodiments herein includes the full scope of the claims, along with all available equivalents of the claims. Herein, the terms "first," "second," etc. are only used to distinguish one element from another, and do not require or imply any actual relationship or order between the elements. In fact the first element can also be called the second element and vice versa. Furthermore, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a structure, device or device comprising a list of elements includes not only those elements, but also others not expressly listed elements, or elements inherent to such structures, devices, or equ...

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Abstract

The invention belongs to the technical field of motors, and discloses a multiphase permanent magnet motor open-circuit fault torque ripple suppression method, which comprises the following steps of: constructing a target function and a virtual voltage vector set of a tracking current reference value in a normal operation state, selecting a virtual voltage vector which enables the target function value of the tracking current reference value to be minimum as an optimal virtual voltage vector; calculating an optimal virtual voltage vector duty ratio; and compensating the optimal virtual voltage vector duty ratio based on a PI regulator to obtain the final action time of the optimal virtual voltage vector. According to the method, fault diagnosis and software reconstruction are not needed, a unified control program and algorithm are used before and after the fault, no extra influence is generated when a motor system operates normally, and torque ripple suppression is automatically carried out after the open-circuit fault of the motor occurs.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for suppressing open-circuit fault torque ripple of a multi-phase permanent magnet motor. Background technique [0002] In recent years, multi-phase permanent magnet motor drive systems have been extensively studied. Compared with three-phase drive systems, multi-phase drive systems provide additional degrees of freedom and enable fault-tolerant operation after failure without additional hardware circuits and downtime for maintenance. Therefore, it is often used in fields with high reliability requirements such as electric aircraft, electric vehicles and marine electric propulsion. However, the control program switching of the software algorithm part after the fault is unavoidable. [0003] Among the various fault types of multi-phase permanent magnet motors, the motor open circuit fault is the most common situation. The model predictive control has been used to deal wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/22H02P21/05H02P25/02H02P6/10
CPCH02P21/14H02P21/22H02P21/05H02P25/02H02P6/10
Inventor 吴新振王海峰郑晓钦曹仁廷
Owner QINGDAO UNIV
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