A method for single-phase short-circuit fault-tolerant control of a low-copper-loss five-phase motor

By acquiring mechanical angle and current reference values, combining decoupling matrix and fault tolerance coefficient, injecting third harmonic current, and using a proportional resonant controller, stable operation of a five-phase motor under single-phase short-circuit faults was achieved, solving the problems of copper loss and control complexity, and improving the motor's load-carrying capacity and stability.

CN116743007BActive Publication Date: 2026-07-17THE UNIV OF NOTTINGHAM NINGBO CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
THE UNIV OF NOTTINGHAM NINGBO CHINA
Filing Date
2022-07-29
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing five-phase motors experience increased copper losses and reduced load-carrying capacity during single-phase short-circuit faults, and the control process becomes more complex, affecting motor stability.

Method used

The mechanical angle is obtained by using a rotary transformer or photoelectric encoder, the current reference value is calculated by a PI controller, and an additional third harmonic current is injected by combining the decoupling matrix and fault tolerance coefficient. The torque pulsation is then offset by a proportional resonant controller to achieve short-circuit fault-tolerant control of the five-phase motor.

Benefits of technology

It reduces copper losses, improves the motor's load-carrying capacity after a fault, simplifies the control process, maintains the motor's stability and torque consistency, and provides good dynamic performance.

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Abstract

This invention relates to a low-copper-loss five-phase motor single-phase short-circuit fault-tolerant control method, comprising: calculating the current reference value of the q-axis of the five-phase motor using a PI controller based on the speed error; converting the reference current on the dq-axis of the motor into a reference current on the αβ-axis using the decoupling matrix of the five-phase motor in a healthy state; determining the reference current on the αβ-axis after a single-phase open-circuit fault by combining the fault tolerance coefficient; calculating the second harmonic torque pulsation generated by the short-circuit current, and injecting an additional third harmonic current to eliminate the obtained second harmonic torque pulsation. This method does not require changing the decoupling matrix, but directly uses the decoupling matrix and fault tolerance coefficient in a healthy state to perform fault-tolerant control of single-phase short circuits, reducing the complexity of the control process. By injecting an additional third harmonic current to offset the torque pulsation of the short-circuit current, copper losses are reduced, and the load-carrying capacity of the motor after a fault is improved, thus improving the stability of the motor.
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