Driving device for a stepping motor
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United States of America Patent
Stats
-
Mar 29, 1988
Grant Date -
N/A
app pub date -
Sep 26, 1986
filing date -
Oct 17, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A driving device for a stepping motor wherein detection of a position of the rotor of a stepping motor can be effected accurately without the necessity of adjustments of various elements. The device detects a current flow in a field winding of an energized phase and compares it with a simulated saturation curve to detect a back EMF induced in the winding to find a current position of the rotor of the motor. The simulated saturation curve is produced by energizing the winding with a low voltage, measuring current flows in the winding as voltage signals at three different points of time, and calculating several data indicating a saturation curve from the voltage signals. The data are stored in memory and recalled one after another to produce a corresponding voltage when the field winding is energized.
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