Control method for reducing torque ripple of doubly salient electro-magnetic motor

Abstract

The invention discloses a control method for reducing torque ripple of a doubly salient electro-magnetic motor, and belongs to the technical field of motor control. With torque ripple minimization being taken as a target, and based on a current given function designed according to the torque generation principle and mutual inductance characteristics of the doubly salient electro-magnetic motor, the method can calculate a current given value required by each phase according to the output of a torque regulator and the position of a rotor at the moment. The output of the current given function serves as set values of three-phase current respectively, so that the problem that the three-phase current is given by the same current and cannot be controlled at the same time when the three phases are conducted at the same time in the phase change stage since the doubly salient electro-magnetic motor adopts traditional torque current closed-loop control is solved; and torque is generated by fullyutilizing mutual inductance change of the three phases, so that the torque generation efficiency of three-phase current is improved while torque pulsation is reduced. The method is suitable for optimizing the torque performance of the electro-magnetic doubly salient motor, and the efficiency of the doubly salient electro-magnetic motor during electric operation is improved.

Description

technical field [0001] The invention specifically discloses a control method for reducing the torque ripple of an electrically excited double salient motor, which belongs to the field of motor control. Background technique [0002] Electric excitation doubly salient motor is a new type of special motor. There are no windings and permanent magnets on the motor rotor. It has the advantages of simple structure, flexible control, good fault tolerance, and is suitable for harsh working conditions. It has good application prospects in aviation, wind power, new energy vehicles and other fields. The reduction of torque ripple is an important aspect to be considered in the smooth operation of the motor, so it is of great significance to study the reduction of torque ripple of electrically excited doubly salient pole motors. [0003] At present, the double-closed-loop structure of speed and current is mainly used for electrically excited double salient pole motors, and the torque rip...

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent applied by the applicant: a torque control method for electrically excited double salient motors, application number: 201811346348.0, proposes a double closed-loop control structure of speed and torque, the control amount is the drive of the power converter The signal can directly control the torque closed-loop and reduce the torque ripple, but it mainly reduces the torque ripple in the non-commutation stage, and the commutation torque ripple caused by the inability to change the current in the commutation stage still exists, and the torque signal is used Directly control the power tube on and off, there is no current closed loop, when the torque feedback is lower than the torque given for a long time, the armature current will be too large

For electrically excited double salient pole motors, if the traditional closed-loop control of torque and current is used to combine the closed-loop of speed and the closed-loop of current, when the three phases are turned on at the same time in the commutation phase, the three-phase currents are given by the same current, and three-phase currents will be generated Problems that cannot be controlled at the same time

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