SRM torque distribution function control system and method based on interval segmentation

Abstract

The invention discloses an interval segmentation-based SRM torque distribution function control system and method, and belongs to the field of motor control. Comprising an interval segmentation torque distribution function module which outputs phase reference torque of each phase according to a total reference torque, an instantaneous phase torque value fed back in real time, a turn-on angle and a turn-off angle set by a system and a position signal fed back by each phase, can partition a commutation interval in real time, and can generate different phase reference torques in different intervals; and the torque hysteresis controller is used for tracking each phase of reference torque output by the interval segmentation torque distribution function module, and transmitting an output control signal to the power converter to control the on and off of a switching device so as to drive the system to operate normally. According to the method, real-time partitioning can be carried out according to the torque generation characteristics of the front phase and the rear phase in the commutation interval, and compared with a traditional torque distribution function control strategy, a specific torque distribution function does not need to be stipulated in advance, and torque ripple minimization can be achieved in a wide speed regulation range.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to an SRM torque distribution function control system and method based on interval segmentation. Background technique [0002] Switched Reluctance motor (SRM) has the characteristics of simple structure, low cost, high reliability and wide speed range, and has good development prospects in the fields of aerospace and new energy electric vehicles. However, due to the doubly salient pole structure and highly nonlinear electromagnetic characteristics of the motor itself, the switched reluctance motor drive system has disadvantages such as large noise and torque ripple, and low power density. Due to the SRM pulse power supply method, especially during the commutation period of the motor, it will cause large torque fluctuations, and the traditional control method cannot suppress the torque ripple generated during the commutation period. The traditional torque sharing function (T...

AI Technical Summary

Problems solved by technology

However, due to the double salient pole structure and highly nonlinear electromagnetic characteristics of the motor itself, the switched reluctance motor drive system has disadvantages such as large noise and torque ripple, and low power density.

Due to the SRM pulse power supply method, especially during the commutation period of the motor, it will cause large torque fluctuations, and the traditional control method cannot suppress the torque fluctuations generated during the commutation period

The traditional torque sharing function (Torque Sharing Function, TSF) control strategy achieves the effect of torque ripple suppression by assigning a reasonable reference torque to each phase in the form of a function in the commutation interval, but this control method is complex in algorithm, The hardware requirements of the controller are high, and the torque tracking ability of the front and rear phases during commutation is not fully considered, and the effect of torque ripple suppression needs to be improved

[0003] Although the literature "Torque Ripple Suppression of Switched Reluctance Motor Based on Improved Torque Distribution Function Method" studies a control strategy that does not specify a specific torque distribution function in advance, the previous phase is always demagnetized during commutation, and the The difference between the total reference torque and the previous phase is always used as the phase reference torque of the latter phase, and only the torque distribution is performed on the latter phase, but the torque tracking ability of the front and rear two phases during the commutation period is not considered, resulting in The increase of the torque of one phase is not enough to compensate the drop of the torque of the previous phase, resulting in a certain torque ripple

Images