A Control Method for Reducing Torque Ripple of Electrically Excited Double Salient Motor

Abstract

The invention discloses a control method for reducing torque ripple of an electrically excited double salient motor, belonging to the technical field of motor control. The present invention aims to minimize the torque ripple, and the current given function designed based on the torque generation principle and mutual inductance characteristics of the electrically excited double salient motor can be calculated according to the output of the torque regulator and the position of the rotor at this time. Current reference required for each phase. The output of the current given function is used as the set value of the three-phase current, which solves the problem that the electric excitation double salient pole motor adopts the traditional torque current closed-loop control. When the three phases are turned on at the same time during the commutation phase, the three-phase current is given by the same current , the problem that the three-phase current cannot be controlled simultaneously. The invention makes full use of the three-phase mutual inductance changes to generate torque, reduces the torque ripple, and improves the efficiency of the three-phase current to generate torque. The invention is suitable for optimizing the torque performance of the electric excitation double salient pole motor and improving the efficiency of the electric excitation double salient pole motor during electric operation.

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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