Title:
磁歪式トルクセンサとこれを利用した電動パワーステアリング装置
Document Type and Number:
Japanese Patent JP4886264
Kind Code:
B2
Abstract:
A magnetostrictive torque-sensor (10) comprising a first magnetostrictive film (14A), a second magnetostrictive film (14B), and a third magnetostrictive film (14C) formed over the entire circumferential periphery of a surface of a rotating shaft (11). A first sensor coil (13A), a second sensor coil (13B), and a third sensor coil (13C) for sensing changes in impedance are provided for the first, second, and third magnetostrictive films, respectively. Signals according to the changes in impedance outputted from the first through third sensor coils are inputted to a torque calculating unit (17). The torque calculating unit (17) calculates the torque applied to the rotating shaft on the basis of the output signal from the first sensor coil and the output signal from the second sensor coil. Furthermore, the output signals from the first through third sensor coils are compared, and failures in the first magnetostrictive film or the second magnetostrictive film are detected by a failure detector (18).
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Inventors:
Jin Harada
Mizuho Dohi
Karasawa Hitoshi
Tomohiro Hoshi
Yuya Kashimura
Mizuho Dohi
Karasawa Hitoshi
Tomohiro Hoshi
Yuya Kashimura
Application Number:
JP2005293030A
Publication Date:
February 29, 2012
Filing Date:
October 05, 2005
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
G01L3/10; B62D5/04
Domestic Patent References:
| JP2000028449A | ||||
| JP2002082000A | ||||
| JP2002257648A | ||||
| JP4359126A | ||||
| JP5052680A | ||||
| JP61245033A | ||||
| JP10260092A |
Attorney, Agent or Firm:
Yoichiro Shimoda
Tamiya Hiroshi
Tamiya Hiroshi