H - Electricity – 02 – K
Patent
H - Electricity
02
K
H02K 29/06 (2006.01) H02P 6/18 (2006.01) H02P 25/08 (2006.01)
Patent
CA 2168163
A switched reluctance motor includes a rotor mounted for rotation about an axis, and having a plurality of rotor poles, and a stator surrounding the rotor and including first, second and third stator phases. The motor also includes energizing means for sequentially energizing the stator phases with an energy source to cause rotation of the rotor, based on rotor position information, the energizing means causing one phase to be energized and then deenergized to near a zero current level prior to a point where the rotor pole breaks away from the stator pole. The energizing means further includes limited current turn on means connected to switch operating means for operating a switch on the one phase to permit flow of limited current through the one phase after it reaches a near zero current level but before the break away point. The motor further includes circuit means connected to the one phase for permitting the limited current to circulate through the one phase; and current sensing means for sensing the amount of current in the one phase and for determining when the current exceeds a predetermined regenerative current threshold at about the break away point, the energizing means being connected to the current sensing means to use this excess regenerative current information at about the break away point for rotor position information.
Bartos Ronald P.
Houle Timothy H.
Mehlhorn William L.
Van Sistine Thomas G.
A.o. Smith Corporation
Riches Mckenzie & Herbert Llp
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