Elimination of discrete position sensor and current sensor in switched reluctance motor drives
- 4 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 518-524
- https://doi.org/10.1109/ias.1990.152234
Abstract
Shaft position sensing is essential in switched reluctance motors (SRM) in order to synchronize the phase excitation pulses to the rotor position. In order to implement closed-loop torque control, current sensors are also unavoidable. These sensors can constitute a substantial portion of the total system cost and tend to reduce system reliability. A low-cost position sensing scheme using stator inductance measurement is presented. An analog electronic technique can be used to measure the inductance of a nonconducting phase by using a linear frequency-modulated (FM) converter. The output of the FM converter is decoded to get the shaft position signal. The control functions and converter switching signals are processed in a low-cost microcontroller. The discrete current sensors for closed-loop operation have been eliminated by using MOS-gated power switches with integrated current sensing capability. The combination of the above two schemes resulted in a totally sensorless SR motor drive.> Author(s) Ehsani, M. Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA Husain, I. ; Kulkarni, A.B.Keywords
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