Fault-tolerant control method for short-circuit faults of 90° phase-angle four-phase permanent magnet motors based on the principle of constant power

Abstract

The fault-tolerant control method for short-circuit faults of four-phase permanent magnet motors with a 90° phase angle and a four-phase permanent magnet motor based on the principle of constant power belongs to the field of multi-phase fault-tolerant permanent magnet motors. When there is a phase short circuit fault, the motor torque output capability is weak and the torque fluctuation is large. The method of the invention maintains the constant output power of the motor by adjusting the current of other non-short-circuit phases when the motor has an end short-circuit fault. When the short-circuit fault of the switch tube occurs in the motor, first control the conduction of the switch tube at the same position of the opposite bridge arm, and adjust the current of other non-short-circuit phases to maintain the output power of the motor. This method weakens the impact of the inverter switch tube short-circuit fault on the motor. influence, which reduces the difficulty of subsequent fault-tolerant control.

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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