The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 2016
Filed:
Mar. 21, 2012
Masaki Kuwahara, Fujisawa, JP;
Takayuki Kobayashi, Fujisawa, JP;
Kazuhiro Yoshida, Fujisawa, JP;
Toshiyuki Onizuka, Fujisawa, JP;
Takayoshi Sugawara, Fujisawa, JP;
Nobuhiko Andou, Fujisawa, JP;
Masaki Kuwahara, Fujisawa, JP;
Takayuki Kobayashi, Fujisawa, JP;
Kazuhiro Yoshida, Fujisawa, JP;
Toshiyuki Onizuka, Fujisawa, JP;
Takayoshi Sugawara, Fujisawa, JP;
Nobuhiko Andou, Fujisawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
There is provided a torque detecting device for providing a highly accurate torque signal, and an electric power steering device using the torque detecting device. A torque sensor is provided with a first coil pair and a second coil pair, which detect a relative displacement between an input shaft and an output shaft by corresponding the relative displacement to a change in impedance. Magnetization signal generating units supply exciting currents with different magnetization frequencies to the first coil pair and a second coil pair, respectively. The magnetization frequency difference is set to 3.5 kHz or higher. Moreover, low-pass filters for intercepting passage of a frequency equivalent to the magnetization frequency difference are deployed in signal processing circuits respectively.