Special Issue: Modern Sensing Technologies

Vol. 90, April 2008, pp. 243-254

Actual Excitation-Based Rotor Position Sensing in Switched Reluctance Drives

Ibrahim AL-BAHADLY

School of Engineering and Advanced Technology, Massey University

Palmerston North, PN321, New Zealand

Tel.: +64 6 350 5799, fax: +64 6 350 2259

E-mail: i.h.albahadly@massey.ac.nz

 Received: 15 October 2007   /Accepted: 20 February 2008   /Published: 15 April 2008

Abstract: The sensing of the rotor position for Switched Reluctance (SR) motor is necessary for excitation control so as to obtain the best performance. The rotor position for SR motor control has usually been measured using a physical rotor position transducer attached to the rotor shaft. The fitting of a rotor position transducer on an SR motor requires additional electrical connections and additional cost, it is also a potential source of unreliability. Considerable attention has recently been applied to various methods for sensorless rotor position measurement, generally based on measurement of phase current and flux and a preknowledge of the magnetic characteristics. This paper presents two methods which deduce sensorless rotor position information by monitoring the actual excitation signals of the motor phases. This is done without the injection of diagnostic current pulses and has the advantages that the measured current is large and mutual effects from other phases are negligible.

Keywords: Rotor position sensing, Sensorless control, Switched reluctance motors

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