Torque sensor using power measurement
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 1, 2000
Grant Date -
N/A
app pub date -
Aug 27, 1998
filing date -
Aug 29, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A torque sensor attached to a shaft for detecting torque applied on the shaft is disclosed. The torque sensor of the present invention includes a magnetic portion attached on the shaft and a retainer arranged to surround the magnetic portion and supported to rotate with respect to the magnetic portion. A first coil supported in the retainer to surround the magnetic portion forms a first magnetic circuit passing through the magnetic portion. A power source applies an alternating current to the first coil. A measuring circuit measures torque applied on the shaft based on an alternating current and an alternating current. The alternating current flows in the first coil when the alternating voltage is applied.
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