A model free fuzzy logic based rotor position sensorless switched reluctance motor drives

Switched reluctance motor drives may be used in many commercial applications due to their simplicity and inexpensiveness. However, they require rotor position information in order to operate. In many systems, though, rotor position sensors are undesirable and have disadvantages. To overcome the disadvantages induced by position sensors, a number of sensorless methods for switched reluctance motors have been proposed by researchers. Nevertheless, these methods present limitations, such as restrictions on the motor operating conditions and ineffectiveness at high speeds and at standstill operation. In this paper, a fuzzy logic-based sensorless control algorithm is described and a description of the implemented hardware system is given. The scheme may be used under all motor operating conditions including standstill and startup. An important feature is that saturation effects and real time nonidealiarities are not ignored, but no mathematical model is required. The system also incorporates techniques to overcome measurement errors and inaccuracies.