Drive apparatus having a stepping motor
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United States of America Patent
Stats
-
Oct 2, 2012
Grant Date -
Apr 22, 2010
app pub date -
Oct 14, 2009
filing date -
Oct 20, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A drive apparatus includes a magnet rotor having a plurality of magnetic poles that are magnetized, a stator having a magnetic pole portion that opposes each pole of the magnet rotor, a coil configured to excite the magnetic pole portion, a position detector configured to detect a position of the magnet rotor, a first driver configured to switch an electrification state of the coil in accordance with a preset time interval, a second driver configured to switch an electrification state of the coil in accordance with an output of the position detector, and a controller configured to select the first driver when the output of the position detector is less than a first threshold, and to select the second driver when the output of the position detector is equal to or larger than the first threshold.
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