Permanent magnet synchronous motor, control method, protection system and storage medium

Abstract

The invention belongs to the technical field of motor vector control, and discloses a permanent magnet synchronous motor, a control method, a protection system and a storage medium. The method comprises the steps: carrying out real-time reconstruction estimation on a flux linkage according to a loss-of-excitation fault monitoring unit; estimating the rotating speed through a rotating speed adaptive rate, and achieving fault-tolerant control of a flux-weakening control system; and judging whether the motor loses excitation by estimating the value of the flux linkage, and processing the excitation loss fault of the motor. According to the invention, by adopting the fault-tolerant control system, the observer is used for estimating the flux linkage in real time, the adaptive rate is used forestimating the rotating speed in real time, and the excitation loss fault judgment unit is used for judging the excitation loss fault, so that whether the motor has the excitation loss fault can be known, control performance reduction of the flux-weakening control system caused by a motor excitation loss fault and inaccurate estimation of the rotating speed is avoided, and fault-tolerant control of the flux-weakening control system is realized.

Description

technical field [0001] The invention belongs to the technical field of motor vector control, and in particular relates to a permanent magnet synchronous motor, a control method, a protection system and a storage medium. Background technique [0002] At present, the permanent magnet synchronous motor has a simple structure, high efficiency, high power factor, and excellent speed regulation performance, and is widely used in many fields such as air conditioners and locomotives. Due to the time and the complexity of the operating environment of the permanent magnet synchronous motor, the flux linkage of the permanent magnet changes, resulting in loss of magnetism. Different motor flux linkages will produce different voltage and current vector trajectories, so the permanent magnet loss will cause the motor to wrongly adjust the excitation current when the motor uses field weakening control to expand the speed, thus affecting the control effect of the entire motor field weakening...

AI Technical Summary

Problems solved by technology

[0004] (1) The performance of the control system is degraded due to the failure of the motor demagnetization

[0005] (2) The motor speed sensorless control realized by the prior art does not take into account the demagnetization fault

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