Pulse signal generating apparatus, rotating machine, control apparatus, and power window control apparatus
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United States of America Patent
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Jun 25, 2013
Grant Date -
Aug 11, 2011
app pub date -
Oct 31, 2008
filing date -
Dec 17, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A magnetic path is formed, in response to the rotation of a motor, by a magnetic detector (24 or 26) (more exactly, a magnetic wire (70)), a magnetic pole of the magnet (22), which is placed counter to each magnetic detector, and the rotating shaft (20). The magnetic wire (70) is formed of a magnetic material capable of causing a large Barkhausen jump. Whenever the magnetic pole opposite each magnetic element changes in response to the rotation of the motor, the direction of magnetic field constituting the magnetic path changes precipitously and a pulse signal in response to the change is outputted from the magnetic detector. Since the direction of magnetization of the magnetic wire (70) changes with a change in magnetic flux density received from a magnet (22), an induced electromotive force occurs due to a change in magnetic flux received by a detection coil. This makes enables the magnetic detector to output pulse signals without power supply.
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