Magnetostrictive torque sensor and electrically powered steering apparatus using same
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United States of America Patent
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Jun 2, 2009
Grant Date -
Apr 5, 2007
app pub date -
Oct 4, 2006
filing date -
Oct 5, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A magnetostrictive torque sensor includes a rotating shaft that is rotated by an applied torque, magnetostrictive films formed around the entire circumferential periphery of a surface of the rotating shaft in at least one location, sensor coils for sensing a change in impedance of the magnetostrictive films, and a torque calculation unit for calculating the torque applied to the rotating shaft on the basis of a signal relating to the change in impedance outputted from the sensor coils. In this magnetostrictive torque sensor, a width of the magnetostrictive films in the axial direction of the rotating shaft and a width of the sensor coils in the axial direction of the rotating shaft are set so as to fulfill the relationship 1<(W1/W2)<1.35.
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