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. 12, 1991
Filed:
Nov. 29, 1988
Hiromi Onodera, Nara, JP;
Toshio Inaji, Minou, JP;
Tsukasa Yoshiura, Katano, JP;
Noriaki Wakabayashi, Hirakata, JP;
Hiroshi Mitani, Daito, JP;
Mitsuo Tokura, Kadoma, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A position control system is disclosed for positioning a stepping motor to a target position according to a closed loop control system. The closed loop control system controls the position of the stepping motor according to a current position signal outputted from an encoder operatively coupled to the stepping motor. Furthermore, circuitry is provided for correcting electrically a torque angle error of the stepping motor caused by a positional error between the stepping motor and the encoder due to a mechanical mounting error of the encoder, to thereby drive the stepping motor at a torque angle maintained at the most desirable range.