Full-vector control method of five-phase fault-tolerant permanent magnet motor

Abstract

The invention discloses a full-vector control method of a five-phase fault-tolerant permanent magnet motor. According to the method, a five-phase SVPWM method is adopted when the motor operates normally; after a one-phase open-circuit fault occurs on the motor, the traditional SVPWM method and a current hysteresis control method are combined together to re-construct a post-fault coordinate system; re-distribution and sector reconstruction of space vectors are performed on the reconstructed coordinate system; target vectors are synthetized through re-selection of the space vectors; and therefore, full-vector control on the five-phase fault-tolerant permanent magnet motor can be realized. With the full-vector control method adopted, problems such as hardware variation and loop width selection brought about by the switching of normal five-phase SVPWM to current hysteresis control existing on most current methods can be solved, and tracking performance can be ensured, and torque ripples after open-circuit faults can be effectively restrained.

Description

technical field [0001] The invention relates to research on a full vector control method of a five-phase fault-tolerant permanent magnet motor, which belongs to the field of motor drive systems and can be used in high-reliability fields such as electric vehicles and ship propulsion. Background technique [0002] In recent years, research on five-phase motors and their drive systems has developed rapidly in the field of electric vehicles. Due to the inevitability of faults, research on fault-tolerant technology for motor drive systems has also gradually developed. Among all the faults, open-circuit faults are always the majority, so it is necessary to study the open-circuit faults of five-phase motors and their drive systems. [0003] At present, there are existing literatures that analyze and study the open-circuit fault-tolerant control of multi-phase motors. The document "Fault-tolerant five-phase permanent magnet motor drives" (published in 2004, Conference Record-IAS An...

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Problems solved by technology

However, most of the literature uses the five-phase SVPWM method to improve the motor efficiency when the motor is running normally, and uses the current hysteresis loop control method after a fault, which will bring corresponding changes in software and hardware and the selection of hysteresis loop width.

The document "Fault-tolerantcontrolforsix-phasePMSMdrivesystemviaintelligentcomplementarysliding-modecontrollingTSKFNN-AMF" (published in 2013, IEEE Transactions on Industrial Electronics, Volume 60, Issue 12, Pages 5747-5762) is carried out on a six-phase motor, and the SVPWM method is used before and after the fault, but the six-phase The motor is divided into two three-phase motors for control, so in essence it is still the three-phase SVPWM method used, not the real fault-tolerant SVPWM method

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