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. 04, 2009
Filed:
Apr. 03, 2007
Yoshiaki Shibasaki, Azumino, JP;
Kosaku Nobuta, Suwa, JP;
Yoshiaki Shibasaki, Azumino, JP;
Kosaku Nobuta, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A method of controlling a stepping motor including a stator having a driving coil wound therearound, and a rotor, the method comprising: performing a driving control of driving the rotor at a predetermined step angle and a stop control of stopping the rotor at a predetermined stop position; and if a predetermined rotation range of the rotor including a range having a maximum position holding torque that is a maximum holding torque of the rotor when the rotor stops with the driving coil thereof being supplied with a current, is referred to as a first rotation range, and a predetermined rotation range of the rotor other than the first rotation range is referred to as a second rotation range, in the stop control, setting the sum of currents supplied to the driving coils to stop the rotor at a target stop position within the second rotation range to be larger than the sum of currents supplied to the driving coils to stop the rotor at a target stop position within the first rotation range.