Implementation of sensorless techniques for switched reluctance motor drive systems

This paper proposes two different methods to estimate the shaft position for a switched reluctance motor. Method 1 uses the self-inductance estimation technique to obtain the rotor position. First, by on-line measuring the slope of the stator current and compensating the back EMF effect, the self-inductance of the switched reluctance motor can be detected. Then, the shaft position of the motor can be estimated according to the self-inductance. Method 2, on the other hand, uses the phase-locked loop technique to generate the high frequency signals. These signals can be used to estimate the shaft position of the switched reluctance motor. The two proposed methods are compared and discussed in the paper. Several experimental results are shown to validate the theoretical analysis.