Five-phase permanent magnet embedded fault tolerant linear motor adjacent two-phase open circuit fault tolerant vector control method

Abstract

The invention discloses a five-phase permanent magnet embedded fault tolerant linear motor adjacent two-phase open circuit fault tolerant vector control method. Based on the principles that the magnetic motive force of traveling waves remains unchanged before and after a fault occurs and that the non-fault phase current sum stays at zero and taking the equality of the non-adjacent two-phase current amplitude as a constrained condition, the non-fault phase fault tolerant current is obtained to further deduce the generalized Clark transform matrix from the natural coordinate system of the non-fault phase to the two-phase stationary coordinate system. The non-fault opposite potential is observed by the transpose matrix of the transform matrix. A current internal model controller, a first-order inertial feed-forward voltage compensator and a counter-electromotive force observer are used to convert the nonlinear close coupling system of such motor under the condition of an adjacent two-phase open-circuit fault into a first-order inertial system. According to the invention, not only the thrust fluctuation caused by motor failure is restrained, but also more importantly, the dynamic performance and the steady-state performance are consistent with those under a normal condition to realize the fast response to non-overshoot and the stable switching frequency of a voltage source inverter.

Description

technical field [0001] The invention relates to a fault-tolerant control method for adjacent two-phase open-circuit faults of a permanent magnet linear motor, in particular to a fault-tolerant vector control method for adjacent two-phase open-circuit faults of a five-phase fault-tolerant permanent magnet linear motor. It is suitable for occasions that have high requirements on the reliability and dynamic performance of the motor, such as aerospace, electric vehicles, deep sea, and medical equipment. Background technique [0002] With the development of society and the improvement of people's living standards, the requirements for the comfort, safety and stability of car driving are getting higher and higher. As an important part of modern automobiles, the performance of the suspension system has an extremely important impact on the ride comfort and operational stability of the vehicle. Therefore, the research on active suspension systems has been highly valued by the industr...

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Problems solved by technology

[0004] In view of the deficiencies in the existing motor fault-tolerant control technology, as well as the characteristics of the five-phase permanent magnet embedded fault-tolerant linear motor proposed by the present invention and the characteristics of two adjacent open-circuit faults of this type of motor, the purpose of the present invention is to overcome the problem of two adjacent motors. The existing fault-tolerant strategy uses current hysteresis control after a phase open circuit fault, resulting in disordered switching frequency of the inverter, reduced motor response speed, poor dynamic performance, inability to accurately follow the current, and severe noise. The existing fault-tolerant vector control strategy cannot achieve two-phase Due to the defect of fault-tolerant operation under the condition of open circuit fault, and the problem of difficult parameter adjustment caused by the contradiction between the rapid response and overshoot of traditional current PI control, a phase for the five-phase permanent magnet embedded fault-tolerant linear motor of the present invention is proposed. The two-phase adjacent open-circuit fault-tolerant vector control method realizes the accurate estimation of the back EMF, reduces the difficulty of controller parameter adjustment, and realizes high fault-tolerant performance, high dynamic performance, and good current follow-up of this type of motor system in the state of adjacent two-phase open-circuit faults performance, reduce CPU overhead, realize constant inverter switching frequency, reduce noise, facilitate electromagnetic compatibility design, and then improve the dynamic performance and reliability

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