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:
Jul. 23, 2002
Filed:
Oct. 17, 2000
Hironori Kato, Miyagi-ken, JP;
Toshiyuki Hoshi, Miyagi-ken, JP;
Yoshio Sanpei, Miyagi-ken, JP;
Hirofumi Okumura, Miyagi-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
The rotation angle detection apparatus comprises: a rotor connected to a rotating body, a rotation angle detection unit, a memory unit and a control unit. Control unit detects an amplitude absolute value of a first angle detection signal and amplitude absolute value of a second angle detection signal. Control unit compares detected amplitude absolute value of first angle detection signal and amplitude absolute value of second angle detection signal to determine which is a smaller amplitude absolute value or a larger amplitude absolute value. Control unit calculates a basic rotation angle of the rotating body based on an arctangent angle of a quotient value obtained by dividing the smaller amplitude absolute value by the larger amplitude absolute value. Control unit converts the basic rotation angle to a different angle value for each of a plurality of angle processing cases, and the rotation angle of the rotating body is detected.