Measuring and testing – Dynamometers – Responsive to torque
Reexamination Certificate
2008-06-20
2010-02-16
Caputo, Lisa M (Department: 2855)
Measuring and testing
Dynamometers
Responsive to torque
Reexamination Certificate
active
07661324
ABSTRACT:
This magnetostrictive torque sensor10includes a rotating shaft11used to rotate according to an input torque and provided with magnetostrictive films14A and14B, an excitation coil12configured to apply an alternating magnetic field31to the magnetostrictive film, and detection coils13A and13B each of which detects a change in the magnetic characteristic of an associated one of the magnetostrictive films. The magnetostrictive torque sensor is configured so that a bias magnetic field is added to the alternating magnetic field from a bias power supply17so as to satisfy the following conditions:in-line-formulae description="In-line Formulae" end="lead"?Hm<Hin<Hn; andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−Hm>−Hin>−Hnin-line-formulae description="In-line Formulae" end="tail"?where Hm(>0) is an applied magnetic field corresponding to a maximum magnetic permeability obtained according to a magnetic hysteresis curve34of the magnetostrictive film, which shows magnetization caused by the alternating magnetic field, Hn(>0) is an applied magnetic field corresponding to an end of a range in which a discontinuous magnetization is performed, and Hin(>0) is an applied magnetic field that determines a sensitivity range to be set on a magnetostrictive sensitivity curve representing a magnetostrictive sensitivity exhibited by the magnetostrictive film.
REFERENCES:
patent: 4506554 (1985-03-01), Blomkvist et al.
patent: 4627298 (1986-12-01), Sahashi et al.
patent: 6966232 (2005-11-01), Asaumi et al.
patent: 7497132 (2009-03-01), Harata et al.
patent: 2001/0035056 (2001-11-01), Garshelis
patent: 2004/0107781 (2004-06-01), Asaumi et al.
patent: 2009/0049931 (2009-02-01), Asaumi et al.
patent: 0 366 217 (1989-01-01), None
patent: 0 366 217 (1989-01-01), None
patent: 2004-191068 (2004-07-01), None
Sasada et al., Torgue Transducers with Stress-Sensitive Amorphous Ribbons of Chevron-Pattern, IEEE Transactions on Magnetics, Sep. 1984, pp. 951-953, vol. MAG-20 No. 5, part 1, New York, US.
Doi Mizuho
Fukuda Yuichi
Harata Hitoshi
Kashimura Yukiya
Arent Fox LLP.
Caputo Lisa M
Honda Motor Co. Ltd.
Kirkland, III Freddie
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