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A Low Cost Position Sensing Method of Switched Reluctance Motor Using Reflective Type Optical-sensors  

Kim S.J. (성균관대 대학원 메카트로닉스공학과)
Yoon Y.H. (성균관대 대학원 메카트로닉스공학과)
Won C.Y. (성균관대 정보통신공학부)
Kim H.S. (동양공업전문대학 자동화시스템과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.10, no.2, 2005 , pp. 148-154 More about this Journal
Abstract
As the exciting point of each phase is determined by the position of rotor, the rotor's accurate position-information is needed for the Switched Reluctance Motor(SRM). When using an absolute-encoder or a resolver, to detect the location of rotor the initial starting is possible, as early sensing of rotor's location is possible. However, this is not appropriate, considering the economical efficiency, and in case of using the incremental-encoder, there's a problem at initial starting as it is not easy to track down the location of rotor at the very beginning. When using Hall-ICs, there's a fault, as it needs a special ring magnet. Considering the initial starting and economical efficiency, the optical sensor technique using a slotted-disk and an opto-interrupter is appropriate, however, this method needs three opto-interrupters and a slotted-disk when using the 6/4 pole SRM. Nevertheless, in this paper, it used only two optical sensors to operate 6/4 pole SRM and made the start up and also forward and reverse operation possible. By excluding the slotted-disc md shortening a optical sensor, it improved the convenience and economical efficiency of the production. Also, as the space for slotted-disc is no more needed, it was able to reduce the size of motor.
Keywords
SRM; Reflective type optical sensors; Position sensing; Opto-interrupter;
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