A switched reluctance machine based system, whether a motor drive or a startedgenerator, requires the rotor position to be determined to commutate at the correct instants. This paper compares the performance of a high-speed switched reluctance startedgenerator (SR S/G) system when operating with a resolver to the performance when operating resolverless, or sensorless, using an electronic position sensing (EPS) subsystem for rotor position estimation. A brief overview of the SR S/G system is given, followed by the approach for sensorless system operation. Test results are given, and system efficiency is compared, for both approaches when operating both as a starter and as a generator. Minimal difference is seen in system emciency, with peaks at over 75 percent for start-mode and at over 79 percent for generate mode, for both resolver-based and sensorless operation. 0-7803-3008-0195 $4.00 0 1995 IEEE
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