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

Abstract

The invention discloses a five-phase permanent-magnet embedded fault-tolerant linear-motor non-adjacent two-phase fault-tolerant vector control method. According to principles that 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 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 one phase short circuit and one phase open circuit of non-adjacent two phases of the motor is restrained, and dynamic performance and stable state performance are consistent with the performance under a normal state.

Description

technical field [0001] The invention relates to a five-phase permanent magnet motor fault-tolerant control method for one-phase short-circuit and one-phase open-circuit among two non-adjacent phases, in particular to a five-phase fault-tolerant permanent-magnet linear motor with one-phase short-circuit and one-phase open-circuit among non-adjacent two-phases Fault Tolerant 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. Therefore,...

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Problems solved by technology

[0004] Aiming at 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 characteristics of one-phase short-circuit and one-phase open-circuit faults among non-adjacent two phases of this type of motor, the purpose of the present invention is to overcome The current hysteresis control used by the current fault-tolerant strategy after the failure of one phase short circuit and one phase open circuit fault among non-adjacent two phases of the motor leads to disordered switching frequency of the inverter, decreased motor response speed, poor dynamic performance, inability to accurately follow the current, and severe noise Disadvantages, traditional current PI control is difficult to adjust parameters due to the contradiction between fast response and overshoot, and the existing fault-tolerant vector control strategy cannot achieve fault-tolerant operation in the case of one-phase short-circuit and one-phase open-circuit faults. The invented five-phase permanent magnet built-in fault-tolerant linear motor fault-tolerant vector control method of one-phase short-circuit and one-phase open-circuit of non-adjacent two phases realizes accurate estimation of back EMF, reduces the difficulty of controller parameter adjustment, and realizes this type of motor The system has high fault-tolerant performance, high dynamic performance, and good current followability under the condition of one-phase short-circuit and one-phase open-circuit fault in two non-adjacent phases, which reduces CPU overhead, realizes constant switching frequency of the inverter, reduces noise, and improves Dynamic performance and reliability of the five-phase permanent magnet embedded fault-tolerant linear motor of the present invention under the fault state of one-phase short-circuit and one-phase open-circuit among two non-adjacent phases

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