Title: Magnetostrictive torque sensor and electrically powered steering apparatus using same
Application Number: 200610143154 Application Date: 2006.10.08
Publication Number: 1945247 Publication Date: 2007.04.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01L1/12;G01L3/10;H01L41/12;H01L41/22;B62D6/10
Applicant(s) Name: Honda Motor Co., Ltd. Address:
Inventor(s) Name: Harata Hitoshi;Hoshi Tomohiro;Fukuda Yuichi;Kashim
Attorney & Agent: magao beng
Abstract:
    A magnetostrictive torque sensor (10) includes a rotating shaft (11) rotated by an applied torque, magnetostrictive films (14A, 14B) formed around the entire circumferential periphery of a surface of the rotating shaft in at least one location, sensor coils (13A, 13B) for sensing a change in impedance of the magnetostrictive films, and a torque calculation unit (17) 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 (10), a width (W1) of the magnetostrictive films (14A, 14B) in the axial direction of the rotating shaft and a width (W2) of the sensor coils in the axial direction of the rotating shaft are set so as to fulfill the relationship 1
Time: 5