Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1995-10-27
1997-12-23
Masih, Karen
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318778, 318720, 310 10, H02P 146
Patent
active
057010641
ABSTRACT:
A polyphase dynamoelectric machine (10) such as a switched reluctance motor has a stator assembly (12) and a rotor assembly (14). The rotor assembly is movable with respect to the stator assembly. The stator assembly includes a stator (16) having a plurality of stator poles (18). The rotor assembly includes a rotor (20) having a plurality of rotor poles (22). The stator assembly further includes a plurality of separately energizable stator windings (24) associated with the respective machine phases. These stator windings are energized and de-energized in a predetermined sequential manner to sequentially activate and deactivate the machine phases. Energization and de-energization of the respective stator windings is at least partially determined as a function of the machine's instantaneous rotor position. The machine includes a processor (26) for determining the rotor position. The processor monitors the waveform of a circulating current coupled from an energized stator winding for an active machine phase into a de-energized stator winding for an inactive machine phase. Respective energized and de-energized stator windings are interconnected to form a closed circuit path by which the current in the energized stator winding is coupled into the de-energized stator winding. Monitoring the resultant current waveform provides an indication of rotor position, and the processor uses this information to energize and de-energize the stator windings.
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French Alan P.
Horst Gary E.
Emerson Electric Co.
Masih Karen
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