Short-circuit fault-tolerant vector control method for embedded hybrid magnetic material fault-tolerant cylindrical linear motor

Abstract

The invention discloses a short-circuit fault-tolerant vector control method for an embedded hybrid magnetic material fault-tolerant cylindrical linear motor. The short-circuit fault-tolerant vector control method comprises the following steps: building a five-phase embedded hybrid magnetic material fault-tolerant cylindrical linear motor model; compensating normal thrust missing caused by a short-circuit fault phase and suppressing a thrust ripple caused by phase short-circuit current with non-fault phase current of the motor; and obtaining expected phase voltage by adopting a series of coordinate conversion and voltage feed-forward compensation strategies, and achieving a fault-tolerant vector control after the phase short-circuit fault of the motor by a zero-sequence voltage harmonic injection-based CPWM modulation mode. According to the short-circuit fault-tolerant vector control method, the motor can suppress the thrust ripple of the motor under the condition of a phase short-circuit fault-tolerant operation; more importantly, the dynamic property, the steady-state performance and the properties in a normal state are consistent; the switching frequency of a voltage source inverter is constant; a CPU is low in overhead; and a natural coordinate system only needs to counterclockwise rotate a certain angle in any phase short-circuit fault, so that the motor fault-tolerant operation can be achieved.

Description

technical field [0001] The invention relates to a novel motor and a phase-short-circuit fault-tolerant fault-tolerant control method, in particular to a five-phase fault-tolerant permanent magnet linear motor and a phase-short-circuit fault fault-tolerant vector control method thereof. It is suitable for occasions that have high requirements on the reliability and dynamic performance of the motor, such as aerospace and electric vehicles. 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 industry. As the core component of the active electromagnetic suspens...

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Problems solved by technology

[0006] In view of the deficiencies in the existing motor fault-tolerant control technology, and the characteristics of the five-phase embedded hybrid magnetic material fault-tolerant cylindrical linear motor proposed by the present invention and the phase short circuit fault characteristics of this type of motor, the purpose of the present invention is to overcome the motor phase short circuit fault After the current fault-tolerant strategy uses current hysteresis control, the switching frequency of the inverter is disordered, the response speed of the motor is reduced, the dynamic performance is poor, the current cannot be followed accurately, the noise is serious, and the existing fault-tolerant control algorithm is complicated. The high-performance short-circuit fault-tolerant vector control method used in the five-phase embedded hybrid magnetic material fault-tolerant cylindrical linear motor of the present invention realizes high fault-tolerant performance, high dynamic performance, and good current follow-up of this type of motor system in a short-circuit fault state performance, reduce CPU overhead, realize constant inverter switching frequency, reduce noise, facilitate electromagnetic compatibility design, and further improve the dynamic performance and reliability of the five-phase embedded hybrid magnetic material fault-tolerant cylindrical linear motor of the present invention under short-circuit fault conditions sex

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