A new sensorless method for switched reluctance motor drives

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Abstract
The paper describes a new method for indirect sensing of the rotor position in switched reluctance motors using PWM voltage control. The detection method uses the change of the derivative of the phase current to detect the position where a rotor pole and stator pole start to overlap, giving one position update per energy conversion. As no a priori knowledge of motor parameters is required (except for the numbers of stator and rotor poles), the method is applicable to most SRM topologies in a wide power and speed range and for several inverter topologies. The method allows medium performance closed-loop dynamics. To start up the motor a feedforward method is used which assures robust start-up from stand-still up to a minimum speed even under load. Experimental results demonstrate the robust functionality of the method with just one current sensor in the lower transistor bus, even with excitation overlap. The method is comparable to the back-EMF position estimation for brushless DC motors. A detailed operation and implementation of this scheme is shown, together with steady-state and dynamic transient test results.

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