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:
Sep. 20, 1994
Filed:
Aug. 25, 1992
Shuichi Tanaka, Tokyo, JP;
Wataru Ichikawa, Tokyo, JP;
Kabushiki Kaisha SG, Tokyo, JP;
Abstract
Primary coils generate flux upon being excited by a predetermined ac signal. A stator is made in a plate-like configuration and has plural primary coils independently in the circumferential direction so that flux is generated by the primary coils in the direction of the axis of rotation. A rotor is provided displaceably relative to the primary coils to change reluctance with respect to the flux generated by the primary coils. Accordingly, as the rotor is rotated, reluctance change is produced due to the relative positional relation between the primary coils provided in the stator and the rotor. This reluctance change causes to change self-inductance of the primary coils and affects the exciting ac signal flowing through the primary coils and, therefore, by outputting the self-induced ac signal in the primary coils, the relative positional relation between the rotor and the primary coils, i.e., the rotational position of the rotor, can be detected.