Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1996-04-17
1999-01-19
Wysocki, Jonathan
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, H02P 700
Patent
active
058617272
ABSTRACT:
An apparatus for controlling a switched reluctance machine changes the operating modes between a single-phase operating mode, and a multi-phase operating mode. The switched reluctance motor includes a rotatable rotor, a stator, and a plurality of stator windings defining a corresponding plurality of machine phases. When in the multi-phase mode, all of the plurality of stator windings corresponding to the plurality of machine phases are energized. When in the single-phase mode, stator windings corresponding to a single, selected machine phase are energized. The apparatus includes a logic circuit for sensing a speed of the rotor and generating a speed signal in response thereto, and a comparator circuit. The comparator circuit is responsive to the generated speed signal and is operative for changing the operating mode of the motor from the multi-phase mode to the single-phase mode when the rotor speed reaches a first predetermined level, and for changing the operating mode of the machine from the single-phase mode to the multi-phase mode when the rotor speed reaches a second predetermined level that is less than the first predetermined level. The first and second levels are offset and define a hysteresis operating band to prevent undesirable oscillation or "hunting" between the single-phase mode, and the multi-phase mode. In the single-phase mode, the current reference used for the energized stator windings associated with the selected machine phase is higher, than the corresponding current reference in the multi-phase mode.
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Blackburn Scott E.
Kolomeitsev Sergei F.
Dana Corporation
Wysocki Jonathan
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