Torque control method and system of current nonlinear compensated switched reluctance motor

Abstract

The invention relates to a torque control method and system of a current nonlinear compensated switched reluctance motor. According to the method, a basic control current is calculated by an electromagnetic torque mathematical expression of a linear induction model of the switched reluctance motor, a set torque is allocated to allocation torques of a switch-on phase and a switch-off phase by an optimal torque-sharing function, and the basic control current of each phase is acquired through conversion; and a nonlinear current compensation value of each phase is figured out and is superposed to the basic control current of each phase to serve as the control current of each phase, and a current hysteresis loop controller is controlled according to the difference between the control current and actually-measured current. A microprocessor of the system is connected with three current sensors and a rotor position angle and torque sensor on the switched reluctance motor, a program storage is provided with a data acquisition module and each calculation module of the method, a control signal is obtained by calculation according to each actually-measured signal, and a pulse width modulator controls three-phase input current of the switched reluctance motor. By the method and the system, the torque ripple of the switched reluctance motor is effectively suppressed, an embedment system can be constructed, and on-line control is facilitated.

Description

technical field [0001] The invention relates to the control field of an electric vehicle motor, in particular to a torque control method and system for a switched reluctance motor with current nonlinear compensation. Background technique [0002] Compared with other types of motors, switched reluctance motor (Switched Reluctance Motor, SRM) has the advantages of simple structure, firmness, no need for permanent magnet materials, high speed, reliable operation and wide speed range, and has gradually become a research hotspot in the field of drive speed regulation. However, the inherent double salient pole structure, highly nonlinear electromagnetic characteristics and switching power supply characteristics of the switched reluctance motor SRM lead to the torque ripple problem of the switched reluctance motor. Due to the strong nonlinearity of the electromagnetic characteristics of the switched reluctance motor, and there is no SRM mathematical model that meets the control req...

AI Technical Summary

Problems solved by technology

[0006] In fact, the inductance L of each phase of the switched reluctance motor changes with the change of the current I, and the relationship between torque and current is strongly nonlinear, making it difficult to analyze the inductance L

[0007] Therefore, the current control of the torque distribution function (TSF) of the switched reluctance motor is difficult to fundamentally solve the strong nonlinear relationship between torque and current, and it is still unable to effectively suppress the SRM torque ripple.

Images