A short-circuit fault-tolerant vector control method for a fault-tolerant cylindrical linear motor with embedded hybrid magnetic materials

Abstract

The invention discloses a short-circuit fault-tolerant vector control method of an embedded mixed magnetic material fault-tolerant cylindrical linear motor, which includes establishing a five-phase embedded mixed magnetic material fault-tolerant cylindrical linear motor model; using the non-faulty phase current of the motor to compensate the short-circuit fault phase It leads to the lack of normal thrust of this phase and suppresses the thrust fluctuation caused by the short-circuit current of this phase; the expected phase voltage is obtained by adopting a series of coordinate transformation and voltage feedforward compensation strategies, and the CPWM modulation method based on zero-sequence voltage harmonic injection is used to realize the motor Fault-tolerant vector control after phase short-circuit fault. The invention can not only suppress the thrust fluctuation of the motor under the condition of phase short-circuit fault-tolerant operation, but more importantly, its dynamic performance, steady-state performance and normal performance are consistent, the switching frequency of the voltage source inverter is constant, and the CPU The overhead is small; when any one-phase short-circuit fault occurs, the natural coordinate system only needs to rotate a certain angle counterclockwise to realize fault-tolerant operation of the motor.

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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