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:
Nov. 10, 2015
Filed:
Oct. 30, 2014
Applicant:
Sharp Kabushiki Kaisha, Osaka, JP;
Inventor:
Tamaki Mashiba, Osaka, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 8/00 (2006.01); H02P 8/14 (2006.01); B65H 7/20 (2006.01); H02P 8/12 (2006.01); H02P 8/16 (2006.01); H02P 8/18 (2006.01); H02P 8/10 (2006.01);
U.S. Cl.
CPC ...
B65H 7/20 (2013.01); H02P 8/10 (2013.01); H02P 8/12 (2013.01); H02P 8/14 (2013.01); H02P 8/16 (2013.01); H02P 8/18 (2013.01);
Abstract
A stepping motor control device includes a driving IC driving a stepping motor by PWM control, and a setting circuit for setting PWM frequency of the driving IC. The setting circuit sets the driving IC such that in stepping motor accelerating and decelerating periods, the PWM frequency of the driving IC becomes higher than the PWM frequency of the driving IC in a constant-speed period of the stepping motor. Thus, power loss of the driving IC in the stepping motor accelerating and decelerating periods can be reduced, and ripple current can be reduced.