Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1996-07-08
1998-09-29
Cabeca, John W.
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318609, 318696, 280707, 280714, 188299, 188319, G05B 1940, B60G 1126
Patent
active
058149643
ABSTRACT:
A method of driving a stepping motor operable on a control signal having a predetermined number of excitation patterns switched in a predetermined sequence during each excitation cycle to rotate, at a predetermined angle defined by two stop positions, through step positions having sequential step numbers with respect to a reference step position. A control unit is powered from a source of power for producing the control signal to the stepping motor. The control unit has a memory for storing a control step position upon interruption of the power to the control unit. The stepping motor is reset to an initial step position set near one of the stop positions when the power to the control unit is resumed. A target step position is set at a step number equal to the step number of the initial step position plus the number of excitation patterns included in each excitation cycle. The stepping motor is driven to make steps in number equal to a difference of the step number of the control step position stored in the memory from the step number of the target step position.
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Cabeca John W.
Unisia Jecs Corporation
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