Power invariant principle-based short circuit fault fault-tolerant control method for four-phase permanent magnet motor with 90-degree phase belt angle

Abstract

The invention discloses a power invariant principle-based short circuit fault fault-tolerant control method for a four-phase permanent magnet motor with a 90-degree phase belt angle, belongs to the field of multi-phase fault-tolerant permanent magnet motors and aims at solving the technical problems that a conventional four-phase permanent magnet synchronous motor with the 90-degree phase belt angle is low in torque output capability and large in torque ripple in a one-phase short circuit fault. According to the method, output power of the motor is maintained constant through adjusting currentof other non-short circuit phases when an end short circuit fault occurs in the motor. When short circuit faults of switch tubes occur in the motor, the switch tubes at the same positions of oppositebridge arms are firstly controlled to be conducted and the current of the other non-short circuit phases is adjusted to maintain the output power of the motor constant. According to the method, the influence on the motor in the short circuit faults of the switch tubes of an inverter is reduced and the subsequent fault-tolerant control difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of multi-phase fault-tolerant permanent magnet motors, and relates to a motor short-circuit fault fault-tolerant technology. Background technique [0002] In recent years, China has vigorously developed its aerospace industry, and has made a series of outstanding achievements in manned spaceflight, satellite communications and space exploration. my country's aerospace industry is ushering in a new period of development. Aerospace servo systems have high requirements for reliability and fault tolerance. However, when the traditional three-phase permanent magnet synchronous motor has a winding open circuit or short circuit fault, the output torque of the motor will change drastically, and even fail to work. The phase redundancy characteristics of the four-phase fault-tolerant permanent magnet motor make it have a certain fault tolerance capability, which meets the requirements of reliability, fault tolerance and servo p...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of weak motor torque output capability and large torque fluctuation when a four-phase permanent magnet synchronous motor with a conventional 90° phase belt angle is faulty in one phase, and provides a 90° permanent magnet synchronous motor based on the principle of constant power. Fault-tolerant control method for one-phase short-circuit fault of four-phase permanent magnet synchronous motor with phase belt angle

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