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:
Oct. 17, 2006
Filed:
Aug. 17, 2005
Masayuki Katakura, Kanagawa, JP;
Asako Toda, Kanagawa, JP;
Yuichi Takagi, Kanagawa, JP;
Hiroshi Kushihara, Nagano Prefecture, JP;
Masayuki Katakura, Kanagawa, JP;
Asako Toda, Kanagawa, JP;
Yuichi Takagi, Kanagawa, JP;
Hiroshi Kushihara, Nagano Prefecture, JP;
Sony Corporation, Tokyo, JP;
Tamagawa Seiki Co., Ltd., Nagano, JP;
Abstract
A resolver use angle detection IC subjected to a phase lock operation so as to follow not an angle θ(t) for detection, but a phase angle ωot±θ(t) having an offset of a frequency ωot in the phase lock units. For this reason, when the excitation frequency ωot is set sufficiently high with respect to the frequency of the angle θ(t), the phase angle ωot±θ to be followed in the phase lock units will not become zero. For this reason, an angle having a high precision can be found in real time regardless of the configuration not including the conventional apparatus in which the configuration is complex and the power consumption is large like a bipolar VCO and an up/down type counter.