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. 16, 2010
Filed:
Sep. 28, 2005
Kazushige Muroi, Nagoya, JP;
Kohei Terada, Nagoya, JP;
Kazushige Muroi, Nagoya, JP;
Kohei Terada, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken, JP;
Abstract
An evaluation device for a rotary drive that evaluates periodic velocity fluctuation of the rotary drive is provided. The evaluation device includes a rotational velocity fluctuation detector, a reference signal generator, and a multiplier-accumulator. The rotational velocity fluctuation detector detects rotational velocity fluctuation relative to a reference velocity of the rotary drive. The reference signal generator generates a reference signal, in which the reference signal has a period and a phase angle. The multiplier-accumulator performs a multiply-accumulate operation between the rotational velocity fluctuation detected by the rotational velocity fluctuation detector and the reference signal generated by the reference signal generator, so as to detect a fluctuation intensity at the phase angle of a component having the period, in which the component is included in the rotational velocity fluctuation detected by the rotational velocity fluctuation detector.