Taking Into Account Nonlinear Properties of Switched Reluctance Machines in Electric Drive Control Algorithms

The problem of creation the switched reluctance drive control system based on the simplified computer model, taking into account non-linear switched reluctance motor properties is considered. It is shown that the control algorithm based on piecewise linear approximation of magnetization curves does not provide a constant phase current and torque on an interval of tooth overlapping. When forming of the controlling signals in model the Miller's normalized magnetization curve is used. It represents family of real magnetization curves as dependence of flux linkage on phase current and the angular position of a rotor. For high speed area the dependence of phase switch on angle from the preset values of current and speed providing decrease of current and torque pulsations by 3-4 times is received.

I. Introduction

Extremely simple construction of switched reluctance machines (SRM) consisting of the salient pole stator with phase windings in the form of the concentrated coils and a passive salient pole rotor provides them increasing interest from experts already for several decades since mid-1980’s. Also the essentially flexibility in their control is very attractive.