Harmonic coupling based current reconfiguring method for phase loss fault tolerant operation of multi-phase motor

A multi-phase motor, operating current technology, applied in the direction of AC motor control, electrical components, control systems, etc., can solve the problems of increased motor loss and reduced efficiency, and achieve the effect of suppressing torque ripple and improving motor performance

Active Publication Date: 2015-10-21
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Increased motor loss and reduced efficiency

Method used

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  • Harmonic coupling based current reconfiguring method for phase loss fault tolerant operation of multi-phase motor
  • Harmonic coupling based current reconfiguring method for phase loss fault tolerant operation of multi-phase motor
  • Harmonic coupling based current reconfiguring method for phase loss fault tolerant operation of multi-phase motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] The implementation of the present invention is described by taking a 9-phase centralized full-pitch winding asynchronous motor as an example.

[0094] Motor stator with 54 slots, rotor with 44 slots, 3 pairs of poles, rated power 30kw, rated speed 970r / min.

[0095] Compare the performance comparison of the motor under three conditions: normal operation of the motor, conventional current reconfiguration method (without considering harmonic coupling), and the current reconfiguration method in consideration of harmonic coupling involved in the present invention. Because the experimental test is not convenient to measure the loss of the rotor, the finite element analysis software Ansoft is used to simulate and verify the three working conditions. The results are as follows image 3 , Figure 4 , Figure 5 shown.

[0096] It can be seen that during normal operation, the torque is stable and the rotor loss is small.

[0097] After adopting the common fault-tolerant algor...

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Abstract

The invention provides a harmonic coupling based current reconfiguring method for phase loss fault tolerant operation of a multi-phase motor. Through introducing additional elliptic rotating fields and substituting amplitude values of standing waves as variables into a magneto-motive force equation for extending the dimension of a prior equation set, the reconfiguring current is solved. By introducing the additional elliptic rotating fields as variables into the equation set and setting and solving the variables, coupling condition of the harmonics can be analyzed and studied directly. By extending the equation set dimension, the additional harmonic magnetic field components are introduced to appropriate constraint conditions and the reconfiguring current is solved. Adverse effects in aspects of torque ripple, loss increase, magnetic field distortion and the like can be reduced to the minimum and the multi-phase motor can operate efficiently, stably and reliably after failure occurs in a non-sine power supply mode.

Description

technical field [0001] The invention belongs to the technical field of multi-phase motors, and relates to a fault-tolerant operating current reconfiguration method for multi-phase motors with phase-lack faults in consideration of harmonic coupling. Background technique [0002] Multiphase motors (number of phases n>3) have attracted increasing attention due to their high reliability and many other advantages, especially in applications such as ship propulsion, rail transit, and electric vehicles, where multiphase transmission systems have high application value. Due to the increase in the number of phases, when one or several phases of the multi-phase motor system fails, the system can still run more smoothly by changing the current and voltage of the remaining phases, which greatly increases the reliability of the system. [0003] After a phase loss fault occurs, each plane of the motor generates an elliptical magnetic field, and the negative sequence component generates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/02
Inventor 康敏
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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