Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1992-07-31
1994-05-31
Shoop, Jr., William M.
Electricity: motive power systems
Switched reluctance motor commutation control
318439, H02P 506
Patent
active
053172434
ABSTRACT:
A circuit and method for operating a polyphase dc motor of the type having a plurality of driving coils that are commutatively energized in a predetermined sequence to rotate a rotor has a zero crossing detector connected to determine when a back emf of a floating driving coil crosses zero. A generator for generating commutation sequence signals controls which of said driving coils are energized a delayed time after said zero crossing detector detects that a back emf of a floating driving coil has crossed zero. A mask circuit inhibits said zero crossing detector for a delayed time after a commutation change, in dependence upon an acceleration of the rotor. Also, a circuit is provided for adjusting the commutation delay time after a back emf of a floating one of said coils crosses zero, in dependence upon the acceleration of the rotor.
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Bachand Richard A.
Jorgenson Lisa K.
Martin David
Robinson Richard K.
SGS-Thomson Microelectronics Inc.
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