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:
Aug. 11, 2020
Filed:
Feb. 22, 2018
Azbil Corporation, Chiyoda-ku, JP;
Hiroaki Narita, Chiyoda-ku, JP;
AZBIL CORPORATION, Chiyoda-ku, JP;
Abstract
A rotation control apparatus includes a relative position sensor that contactlessly detects the mechanical displacement amount of a shaft to be actuated in a direction of rotation, absolute position sensors that are provided at mutually different positions within a rotatable range of the shaft to be actuated and each output a detection signal when the shaft to be actuated has reached its corresponding position, and a position calculating unit that calculates an absolute position of the shaft to be actuated in the direction of rotation on the basis of an integrated value of the mechanical displacement amount since the detection signal is output and a reference value indicating a position corresponding to the absolute position sensor that has output the detection signal. At least one of the absolute position sensors is provided to correspond to a third position excluding a first position and a second position within the rotatable range.