Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1995-06-06
1998-10-13
Sircus, Brian
Electricity: motive power systems
Open-loop stepping motor control systems
318254, 318439, H02P 800
Patent
active
058217223
ABSTRACT:
A motor has a stationary assembly including three windings in magnetic coupling relation to a rotatable assembly, the position of which is sensed by a position sensor. A converter, adapted to be coupled to a power supply, energizes each of the windings with a voltage. The converter is responsive to the angular position and speed of the rotatable assembly for selectively energizing each of the windings according to a preselected sequence. The converter energizes each winding with the voltage throughout a commutation period when a back EMF induced in such winding has a polarity opposite to a polarity of the voltage energizing such winding, the commutation period for each winding overlapping the commutation period for another winding. Alternatively, the converter energizes each winding with the voltage throughout a commutation period of 180 electrical degrees, the commutation period for each winding overlapping the commutation period for another winding. As a result, torque ripple in the rotation of the rotatable assembly is reduced.
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Forbes Franklin L.
Krefta Ronald J.
Patel Amritlal H.
General Electric Company
Sircus Brian
Traynham Wayne O.
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