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:
Mar. 21, 2006
Filed:
Mar. 04, 2004
Takao Takehara, Tokyo, JP;
Takao Takehara, Tokyo, JP;
Minebea Co., Ltd., Nagano-ken, JP;
Abstract
An R/D converter allows high precision detection of a rotation angle of a rotor axis of a resolver having high rates of rotation. An A/D converter is built into a digital signal processor and converts a sine wave and cosine wave output from the resolver. An axis angle calculator calculates tan θ=A((sin ωt)(sin θ))/A((sin ωt)(cos θ)) from A(sin ωt)(sin θ) and A(sin ωt)(cos θ) and further calculates θ=tanθ. The angle space is divided into quadrants and an offset value is set for each quadrant and by adding or subtracting the calculated θ to or from the offset value to form the final angle of the rotor axis of the resolver.