A direct instantaneous torque control system and method for a switched reluctance motor

Abstract

The invention provides a direct instantaneous torque control system and method of a switched reluctance motor based on a hysteresis loop optimization strategy. The method of the present invention includes the following steps: setting the upper and lower limits of the torque hysteresis loop and the reference torque, detecting the output torque of each phase and obtaining the actual output torque, and calculating the torque deviation; based on the torque deviation and the upper limit of the torque hysteresis loop, The relationship of the lower limit adjusts the working state of the power converter during single-phase and commutation operation; the actual output torque is derived with respect to time to obtain discrete slope data, and then a complete slope data curve for an electrical cycle is obtained; calculate an electrical cycle The most reasonable sampling time times for each rotor position torque from the hysteresis lower limit to the hysteresis upper limit, and select the best hysteresis value under different rotor positions to assign the hysteresis lower limit and dynamic hysteresis upper limit in the hysteresis system to realize the hysteresis adaptive control. The motor of the present invention has smooth output torque and significantly reduced torque ripple, ensuring more stable and efficient operation of the motor in an electric transmission system.

Description

technical field [0001] The invention relates to the technical field of switched reluctance motors, in particular to a system and method for direct instantaneous torque control of switched reluctance motors based on a hysteresis loop optimization strategy. Background technique [0002] Switched reluctance motor (SRM) has simple structure, flexible control, high adaptability and fault tolerance due to its special double salient pole structure, concentrated winding on the stator, and no permanent magnet material and winding on the rotor. Strong and other advantages. However, due to the unique structural characteristics and working principle of the switched reluctance motor, the characteristics of the motor are significantly different from other AC and DC motors, so it also leads to many shortcomings that urgently need to be studied and improved. The switched reluctance motor is a doubly salient pole structure and uses a switching method for power supply. The edge flux will cau...

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Problems solved by technology

However, the above three traditional control strategies do not take targeted control on torque ripple suppression, and cannot simultaneously solve the two major problems of speed regulation and torque ripple suppression

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