ELECTRONIC CONTROL DEVICE IN PARTICULAR FOR USE IN A VARIABLE RELUCTANCE MOTOR

摘要

A control device for an electric motor with a stator having at least four groups of coils. Four switches are connected to the four coil groups so that two switches connect one terminal of a DC voltage supply to two coil groups and the other two switches connect the other terminal of the DC supply to the other two coil groups. A rotor position detector operates the first two switches in mutually exclusive time intervals at a frequency related to the rotor rotation. A pulse generator and two AND gates operate the other two switches in mutually exclusive time intervals at the frequency of the pulse generator. The frequency and the width of the pulse generator output pulses are variable.