Torque ripple minimization fault-tolerance control method in loss of phase of six-phase motor

Abstract

The invention discloses a torque ripple minimization fault-tolerance control method in loss of phase of a six-phase motor. The method, after the loss of phase of the six-phase motor, decomposes residual phase magnetomotive force into positive sequence rotational component and negative sequence rotational component so as to eliminate negative sequence synthetic component from synthesized magnetomotive force, such that the synthetic magnetomotive force of a stator is similar to circular rotating magnetomotive force. According to the invention, the method aims at weakening torque ripple in loss of phase by eliminating the negative sequence component from the synthetic magnetomotive force of the stator. If the six-phase permanent magnetic synchronous motor has a phase winding loss of phase fault, the adjustment of the phase angle of the residual phase winding current can make the magnetomotive force to approach circular rotating magnetomotive force, such as to reduce the torque ripple of the motor.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a fault-tolerant control method based on a negative-sequence composite component in the stator magnetomotive force, which is suitable for multi-phase motors. Background technique [0002] With the rapid development of the economy, my country's automobile production continues to grow rapidly, which directly leads to the serious consumption of my country's oil resources and serious environmental pollution. The emergence of electric vehicles has alleviated these problems to a certain extent. Compared with traditional fuel vehicles, electric vehicles have many advantages. The driving motor of electric vehicles not only has high efficiency, but also can be converted into generator operation during braking. Thus, the kinetic energy of the running of the car is converted into electric energy and stored in the battery, which greatly improves the energy utilization rate. [00...

AI Technical Summary

Problems solved by technology

When the motor has a phase failure, although compared with the three-phase permanent magnet synchronous motor, the six-phase permanent magnet synchronous motor can still output torque to maintain the operation of the electric vehicle, but the motor will fluctuate greatly. The requirements are relatively high, so some methods need to be taken to reduce the torque fluctuation of the motor

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