Torque sensing apparatus and method
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United States of America Patent
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Jul 5, 2005
Grant Date -
Aug 22, 2002
app pub date -
Nov 2, 2001
filing date -
Nov 21, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A torque sensor comprising a shaft of magnetostrictive material; a pair of magnets having oppositely sensed poles positioned circumferentially around the shaft so as to induce a localized magnetic field in the shaft between the poles. A torque applied to the shaft is sensed by a flux detector positioned circumferentially between the magnet poles so as to detect a component of the localized magnetic field which escapes from the shaft as a result of the torque. With this design, there is no need to permanently magnetize the shaft or a collar attached to the shaft, as in the prior art. The prior art manufacturing step of permanently magnetizing the collar or its shaft is also thus eliminated, greatly simplifying the manufacturing.
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