Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1994-03-28
1996-04-30
Martin, David S.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02P 118
Patent
active
055128050
ABSTRACT:
A circuit for operating a polyphase dc motor that has a plurality of driving coils has circuitry for receiving the back emf of at least one of the driving coils at a time when the at least one of the driving coils is in a floating state prior to the desired commutation sequence. Circuitry is provided for determining an anticipated direction the back emf will cross a reference voltage based upon the desired commutation sequence. And circuitry is also provided for determining if the back emf received by the circuitry for receiving the back emf crosses a reference voltage from other than the anticipated direction.
In addition, a method for operating a polyphase dc motor having a plurality of driving coils includes determining the actual instantaneous position of the rotor of the motor by determining when the back emf of at least one coil at a time when the at least one coil is in a floating state prior to the desired commutation sequence crosses a reference voltage from a predetermined direction. A desired rotor position precedent to executing a desired commutation sequence is determined, and the desired commutation sequence is executed when the circuit for determining the actual instantaneous position of the rotor detects that the rotor is actually in the desired rotor position. A signal is generated if the back emf of the at least one coil in a floating state crosses the reference voltage from other than the predetermined direction.
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Carobolante Francesco
Rohrbaugh Mark E.
Anderson Rodney M.
Bachand Richard A.
Jorgenson Lisa K.
Martin David S.
SGS-Thomson Microelectronics Inc.
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