Controlling method of 4 phase permanent magnet fault tolerant motor

Abstract

The invention discloses a control method of a four-phase permanent magnet fault-tolerant motor. In the method, a control mode can be automatically decided according to the diagnosed situation of a system failure; when the system is at a normal state, an SVPWM control is adopted; when the system has a phase-lacking failure, a fault-tolerant torque control is adopted; different fault-tolerant control proposals are adopted according to different types of phase-lacking failures. The control method realizes that the four-phase permanent magnet fault-tolerant motor can operate with high performance under the normal condition and the phase-lacking condition, overcomes the deficiency that the stable performance of the system when in normal working is reduced in the traditional fault-tolerant control system which adopts current for regulating PWM for realizing current tracing for the convenience of fault-tolerant control, establishes a mathematical model of the four-phase permanent magnet fault-tolerant motor under a rotating coordinate system, successfully applies an SVPWM strategy to the four-phase permanent magnet fault-tolerant motor and enhances the dynamic and static performances and reliability of the control system of the four-phase permanent magnet fault-tolerant motor.

Description

technical field [0001] The invention relates to a control method of a four-phase permanent magnet fault-tolerant motor, which is suitable for special electric transmission fields such as aerospace and military equipment that have high requirements for reliability, and belongs to the technical field of electric transmission control. Background technique [0002] The electric actuator system is an indispensable key component of the flight automatic control system. Whether it can work reliably directly determines whether the aircraft can fly safely. Therefore, the research on high-reliability electric actuators has attracted extensive attention in the aerospace field. The development of reliability technology is going through the development from primary redundancy technology to advanced fault tolerance technology. Four-phase permanent magnet fault-tolerant motors have attracted widespread attention in foreign aerospace fields because of their high reliability and fault toleran...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiency that the traditional fault-tolerant control system uses current regulation PWM to realize current tracking and sacrifices the steady-state performance of the motor under normal conditions for the convenience of fault-tolerant control, and proposes a four-phase permanent magnet fault-tolerant motor. The fault-tolerant dual-mode control method realizes its high-performance operation under normal and open-phase fault conditions; the further purpose of the present invention is also to address the deficiencies in high-precision and high-reliability control of existing four-phase permanent magnet fault-tolerant motors, A SVPWM strategy different from the traditional three-phase system is proposed, and it is applied to the control system of the four-phase permanent magnet fault-tolerant motor. A fault-tolerant torque control strategy, which conveniently realizes its undisturbed operation under fault conditions and maximizes its load capacity under fault conditions

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