Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1995-02-28
1996-05-14
Martin, David S.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02P 602
Patent
active
055170951
ABSTRACT:
A method and circuit for operating a polyphase dc motor having a plurality of driving coils is presented. In one of the available operating modes, drive current supplied to the driving coils is chopped, in PWM fashion to control the maximum current delivered thereto by turning the drive current on and off. Zero crossings of a back emf voltage of the driving coils that are connected into a floating state are detected for producing a commutation signal, and the detection of zero crossings is inhibited for a predetermined time after the drive current is turned off during the chopping step to avoid detecting a false zero crossing. In normal operation, detected back emf sampled voltages are forwarded to back emf detection circuitry responsive to a high frequency clock.
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Cameron Scott W.
Carobolante Francesco
Anderson Rodney M.
Bachand Richard A.
Jorgenson Lisa K.
Martin David S.
SGS-Thomson Microelectronics Inc.
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