Control method for reducing current fluctuation of switched reluctance motor in current chopping control mode

Abstract

The invention provides a control method for reducing a current fluctuation of a switched reluctance motor in a current chopping control mode. The control method is suitable for the switched reluctancemotors of various phase numbers and structures under a non-inductance model. The control method is characterized in that a conduction period is divided into a phase change section and a separate conduction section according to a position sensor signal; a given current is determined by a given rotating speed and an actual motor rotating speed obtained by calculation through a position sensor; thecurrent of a winding of each phase is collected through a hall current sensor; a PWM duty ratio of the phase change section and a PWM duty ratio of the separate conduction section are respectively adjusted according to the given current and the actual currents of the winding of each phase at the phase change section and the separate conduction section; and inputs of a controller are a rotating speed difference, the actual current of the winding and the position signal, and outputs are the PWM duty ratios, so that the control of a power converter is realized, the power converter controls the on-off of the electric energy of the switched reluctance motor, and the motor rotating speed is controlled. According to the control method, the steady-state characteristic of the switched reluctance motor is improved, the steady-state operation efficiency is improved, and the motor output torque ripple is reduced.

Description

technical field [0001] The invention relates to a method for suppressing the current fluctuation of a switched reluctance motor, which is suitable for switched reluctance motors with various phase numbers and structures under a non-inductance model. Background technique [0002] Switched reluctance motor has attracted wide attention in the transmission system due to its simple structure, low manufacturing cost, good controllability, and frequent forward and reverse rotation. Due to the high reliability and simple implementation of the current chopper control method, it has become a control method commonly used in switched reluctance motors in practical applications. However, since the current chopper control belongs to the hysteresis control, the winding current of the switched reluctance motor fluctuates beyond the upper and lower limits of the chopper. Reaching about twice the reference current, this will increase the power loss of the transmission line in the system and ...

AI Technical Summary

Problems solved by technology

[0003] In view of the above existing problems, the present invention proposes a way to reduce the current fluctuation of the switched reluctance motor under the current chopping control mode, so as to realize the adaptive adjustment of the PWM duty cycle when the current chopping is turned on at different speeds and loads , which solves the problem that the current fluctuation exceeds the upper and lower limits of chopping under the current chopping control mode

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