A Torque Ripple Minimal Fault Tolerant Control Method Considering Reluctance Torque

Abstract

The invention discloses a torque ripple minimum fault-tolerant control method considering a reluctance torque. The torque ripple minimum fault-tolerant control method comprises the following steps of acquiring a motor parameter by finite element simulation software, wherein the motor parameter mainly comprises a no-load counter potential and an inductance waveform; performing polynomial fitting on the obtained inductance waveform by a matrix laboratory (MATLAB); determining an expression of a fault-tolerant current according to information of a fault phase; solving an electromagnetic torque of a motor according to a magnetic functional method of the motor and according to the obtained fault-tolerant current, inductance and the counter potential, wherein the electromagnetic torque comprises a permanent-magnet torque component and a reluctance torque component; decomposing the obtained electromagnetic torque into an average torque component, a secondary torque component and a quartic torque component; determining an equation set according to a principle that the average torque before and after a fault is not changed, the torque pulse is minimum and the sum of remaining normal phase currents is zero; and solving an optimal fault-tolerant current under the optimization condition of minimum quadratic sum of current amplitudes by an MATLAB non-linear optimization tool box. The torque pulse minimum fault-tolerant control containing the reluctance torque is achieved by a current hysteresis controller.

Description

technical field [0001] The invention relates to the technical field of fault-tolerant control of permanent magnet synchronous motors, in particular to a torque ripple minimum fault-tolerant control considering reluctance torque. It is suitable for occasions that have high requirements on the reliability of motors, such as aerospace, electric vehicles, and ship propulsion systems. Background technique [0002] Because of its high torque density, high efficiency and high reliability, the embedded permanent magnet motor is widely used in the fields of electric vehicles, aerospace and marine cruise systems. At the same time, a stable and reliable motor drive system is particularly important for some occasions that require high reliability, such as aircraft and electric vehicles. Therefore, high-reliability fault-tolerant control methods for permanent magnet motors have received extensive attention. [0003] In recent years, scholars at home and abroad have carried out in-depth...

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Problems solved by technology

[0004] In view of the fact that the existing fault-tolerant algorithm cannot use the reluctance torque to improve the output torque performance of the embedded five-phase permanent magnet synchronous motor during fault-tolerant operation, and does not take into account the torque ripple generated by the reluctance torque component during the fault-tolerant operation of the motor, cannot be suppressed effectively

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