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. 01, 2011
Filed:
Apr. 10, 2008
Yoshihisa Yamada, Shizuoka, JP;
Yoshihisa Yamada, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
A stepping motor drive is provided, by which a recoil movement of a driven member upon an initialization action can be reduced. The stepping motor drive includes: a drive signal supply means which supplies a plurality of periodic drive signals having different phases from each other to generate a rotation torque in a stepping motor, one electric cycle being constructed by a plurality of excitation steps; a control means which makes the drive signal supply means supply the drive signal upon a initialization action in which a driven member connected with rotation of the stepping motor is made abut against a stopper; and a first storing means which stores a torque control parameter according to an inversion phase characteristic intrinsic to the stepping motor.