Fault-tolerant vector control method for adjacent two-phase faults of five-phase permanent magnet embedded fault-tolerant linear motor

Abstract

The invention discloses a five-phase permanent-magnet embedded fault-tolerant linear-motor adjacent two-phase fault-tolerant vector control method. According to principles that traveling wave magnetomotive forces before and after a two-phase open-circuit fault are invariant and a non-fault-phase current sum is zero, a condition that non-adjacent two-phase current amplitudes are equal is taken as a constraint condition so as to derive and popularize a Clark transformation matrix; matrix transposition is used to estimate a counter potential; and an inner model controller, a first-order inertia feedforward voltage compensator and a counter potential observer are used to change a nonlinear strong coupling system of the motor under a fault state into a first-order inertia system. According to a principle that a synthesized magnetomotive force of a non-fault-phase short circuit compensation current and a short circuit fault phase current is zero, a short circuit compensation voltage is calculated. The voltage is superposed with an output voltage of a vector control device. By using the method of the invention, a motor thrust fluctuation caused by adjacent two phase faults of the motor is restrained, dynamic performance and stable state performance are consistent with the performance under a normal state, and a switch frequency of a voltage source inverter is constant.

Description

technical field [0001] The invention relates to a fault-tolerant control method for one-phase short-circuit and one-phase open-circuit faults in two adjacent phases of a five-phase permanent magnet motor, in particular to a fault-tolerant control method for one-phase short-circuit and one-phase open-circuit faults in two adjacent phases of a five-phase permanent magnet linear motor Vector control method. 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. T...

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the existing motor fault-tolerant control technology, according to the characteristics of the five-phase permanent magnet embedded fault-tolerant linear motor and the fault characteristics of one phase short circuit and one phase open circuit fault in two adjacent phases of this type of motor, the purpose of the present invention is to overcome the motor The current hysteresis control used in the existing fault-tolerant strategy after one-phase short-circuit and one-phase open-circuit faults in two adjacent phases leads to the disadvantages of disordered switching frequency of the inverter, decreased motor response speed, poor dynamic performance, inability to accurately follow the current, and severe noise. Due to the problem of difficulty in parameter adjustment caused by the contradiction between rapid response and overshoot in traditional current PI control, and the fact that the existing fault-tolerant vector control strategy cannot realize fault-tolerant operation in the case of one-phase short-circuit and one-phase open-circuit faults, a method for the present invention is proposed The fault-tolerant vector control method of one-phase short-circuit and one-phase open-circuit of the five-phase permanent magnet embedded fault-tolerant linear motor realizes the accurate estimation of the back EMF, reduces the difficulty of controller parameter adjustment, and realizes the High fault-tolerant performance, high dynamic performance, and good current followability under the fault state of one phase short circuit and one phase open circuit in two adjacent phases, reduce CPU overhead, realize constant inverter switching frequency, reduce noise, and then improve the five functions of the present invention Dynamic performance and reliability of phase permanent magnet embedded fault-tolerant linear motor under this fault state

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