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.