Patent ID: 6359413
Filing Date: 2002-03-19
Classification: H02P

Abstract:
A current control system for a switched reluctance motor having a rotor defining a plurality of rotor poles, a stator defining a plurality of stator poles and at least one phase winding associated with at least one stator pole, said system comprising:a current regulator for receiving a current reference signal indicative of the desired output of the motor and a motor current signal indicative of the current in at least one phase winding and for providing a output signal in response to a difference between the motor current and the current reference signal; a back EMF decoupler for generating a back EMF signal indicative of back EMF created by the switched reluctance motor and adding said back EMF signal to the current regulator output signal and producing a back EMF decoupled duty cycle command signal; an inverter circuit responsive to said back EMF decoupled duty cycle command signal for switching current in at least one phase winding on and off to rotate the rotor of the switched reluctance motor; wherein said back EMF signal has a duty cycle equal to a sum of a calculated back EMF and a DC voltage supplied to the motor, said sum divided by twice said DC voltage; and wherein said calculated back EMF is equal to a partial derivative of a phase flux linkage with respect to a rotor position times a rotor speed.