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. 04, 2020
Filed:
Dec. 04, 2015
Oriental Motor Co. Ltd., Tokyo, JP;
Daiki Kondo, Ibaraki, JP;
ORIENTAL MOTOR CO. LTD., Tokyo, JP;
Abstract
An electrostatic encoder () detects the rotation angle of a rotor () with great accuracy based on the change in the capacitance between electrodes arranged on a stator () and the rotor (). Detection electrodes (to) and transmission electrodes (to) are arranged circumferentially and alternately on the stator (). Detection signals (phase A, phase B) amplitude-modulated based on the rotation of the rotor () and having a mutual phase difference of 90 degrees are output from adjacent ones of the detection electrodes. Modulated signals (V, V) are generated by demodulating the detection signals having a mutual phase difference of 90 degrees. Applying resolver-digital (RD) conversion processing to the modulated signals allows obtaining the rotation angle of the rotor.