Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Analog armature control
Patent
1995-02-13
1995-10-03
Shoop, Jr., William M.
Electricity: motor control systems
Open loop speed control system for dc motor with commutator
Analog armature control
318771, 318778, 318779, 388808, H02P 7285
Patent
active
054558859
ABSTRACT:
A method and apparatus for operating a polyphase dc motor selectively in dual-coil or uni-coil commutation modes. The motor has a plurality of "Y" connected driving coils connected together at a center tap. Each driving coil has an input node at an end opposite the center tap, and is driven by a switch pair. Each switch pair is arranged for connection in series across a power supply voltage, and has a node between each switch connected to a respective one of the coil input nodes. An additional pair of switches are provided for connection in series across the power supply with a connection node between each switch connected to the center tap. A circuit is provided to operate the switches to cause a driving current to be passed between sequentially selected pairs of the driving coils for an initial start-up time. Also, a circuit to operate the switches after the initial start-up time is provided to cause a driving current to be passed between sequentially selected only single ones of the driving coils and the center tap current input node. The apparatus also has a circuit for detecting a zero crossing of a bemf signal of a floating one of the driving coils and a delay circuit for establishing a delay between a zero crossing and a commutation of driving signals to the coils. A circuit operates the delay circuit to provide a first predetermined delay in dual-coil mode and a second predetermined delay in uni-coil mode.
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Arrambide Joseph C.
Bachand Richard A.
Jorgenson Lisa K.
Masih Karen
SGS-Thomson Microelectronics Inc.
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