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Application of sensor integration techniques to switched reluctance motor drives

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4 Author(s)
MacMinn, Stephen R. ; General Electric Co., Schenectady, NY, USA ; Rzesos, W.J. ; Szczesny, P.M. ; Jahns, T.M.

A novel drive system for a switched reluctance motor (SRM) is described. Instead of current sensors, the drive uses power MOSFET transistors with integrated pilot devices for current sensing. To compensate for the loss of current feedback when the switches are `off', a fixed off-time chopping strategy is used to control the phase currents. To eliminate the position sensor normally required for SR motor control, the controller estimates the rotor position using phase inductance measurements. The position estimation scheme is sufficiently precise to allow positioning of the phase firing pulses to within approximately two electrical degrees of the desired rotor angle, and full four-quadrant operation of the system is possible. A laboratory prototype system built and tested at speeds up to 3000 r/min shows good performance in all four operating quadrants, including at zero speed. The control is implemented in a single low-cost microprocessor

Published in:

Industry Applications, IEEE Transactions on  (Volume:28 ,  Issue: 6 )

Date of Publication:

Nov/Dec 1992

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