A fault-tolerant control method for non-ideal sinusoidal back EMF permanent magnet synchronous motor with phase failure

Abstract

The invention relates to a phase loss fault tolerant control method for a non-ideal sinusoidal counter electromotive force permanent magnet synchronous motor, which is characterized in that the unit counter electromotive force in a synchronous rotating coordinate system is obtained through performing coordinate transformation on an offline collected three-phase counter electromotive force of the permanent magnet synchronous motor, and the reference q-axis given current corresponding to the unit torque is derived according to the unit counter electromotive force and an electromagnetic torque formula under the synchronous rotating coordinate system. When a single-phase armature winding of the motor is disconnected, an equivalent relationship between the non-fault phase compensation current and a zero-axis compensation current reference value is obtained according to a principle that the electromagnetic torque of the motor is constant under normal and phase loss conditions, the torque ripple caused by the phase loss fault is compensated by adopting zero-axis voltage feedforward and current closed-loop compensation, and fault tolerant control for the non-ideal sinusoidal counter electromotive force permanent magnet synchronous motor under the phase loss fault is realized.

Description

technical field [0001] The invention relates to a non-ideal sinusoidal counter electromotive force permanent magnet synchronous motor phase-break fault-tolerant control method, which is used to realize the safe and stable operation of the motor drive system after the non-ideal sinusoidal counter electromotive force permanent magnet synchronous motor loses phase. Background technique [0002] Phase failure caused by power supply circuit failure, winding connection failure, conductive slip ring failure and other factors is one of the most common failures of motors. Investigations and studies have shown that open-phase faults account for more than 50% of motor winding damage accidents. After the motor is open-phase, it runs in a two-phase state. The current of the non-faulty phase winding increases sharply, the torque ripple increases, and the motor control performance decreases. Run or even burn the motor. In order to avoid the above unfavorable factors, the open-phase fault-...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: Aiming at the problem that the winding current of the non-faulty phase increases sharply and the torque ripple of the motor increases after the phase failure of the non-ideal back EMF permanent magnet synchronous motor, based on the fault-tolerant topology of the four-bridge arm, an off-line inspection method is proposed. Meter control strategy, through the combination of zero-axis voltage feedforward and zero-axis current closed-loop control after a fault, the tracking control of the non-faulty phase winding current is realized, the non-faulty phase winding current is reduced, and the torque ripple caused by the open phase is compensated

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