Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1995-03-14
1996-06-11
Wysocki, Jonathan
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, H02P 700
Patent
active
055258875
ABSTRACT:
A switched reluctance motor includes a rotor mounted for rotation about a rotor shaft axis and a stator surrounding the rotor and having at least three electrically independent stator phases. The motor includes an electronic circuit for selectively energizing the phases in succession with a run current to generate a torque on the rotor and thereby rotate the rotor. The circuit includes switch operating means for selectively operating switches connecting an energy source to the phases. The circuit also includes current sensing means for sensing the amount of current in each of the phases, and timing means for determining the amount of time for the current in each phase to reach a predetermined current level threshold. The circuit also includes pulse means for periodically selectively operating the switch operating means for a limited time to energize the unenergized phases with a seek current without substantially generating torque on the rotor, and comparing means for comparing the amount of time that current in each of the unenergized phases took to reach the predetermined current level threshold. The circuit also includes run means connected to the comparing means and the switch operating means for switching on a selected one of the switches to rotate the rotor.
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A. O. Smith Corporation
Lowe, Jr. James Earl
Miller Thomas A.
Wysocki Jonathan
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