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:
Sep. 01, 1987
Filed:
Apr. 16, 1986
Masahiko Sato, Funabashi, JP;
Kazutoshi Kato, Narashino, JP;
Akira Ishibashi, Tokyo, JP;
Tsurumasa Matsushita, Narashino, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
It takes a comparatively long time for a rotor of a stepping motor to be positioned at the next target stop position (target angular position) and stopped there. This time is the settling time. Before the rotor passes through the next target angular position and begins to oscillate, necessary control is provided to reduce the magnitude of the oscillation for the purpose of shortening the settling time. The phase excitation on each winding of the stepping motor is usually changed over successively until the target angular position is reached. When the stepping motor has approached the target angular position, the changeover of phase excitation is gradually conducted. As a result, the magnitude of the above described oscillation is reduced and hence the settling time is shortened.