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. 21, 1989
Filed:
Aug. 25, 1988
Hideki Kabune, Kariya, JP;
Kohji Kamiya, Chita, JP;
Kiyoshi Miyake, Kariya, JP;
Shigeru Saito, Kariya, JP;
Shinichi Yamada, Kariya, JP;
Ken Asami, Nagoya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an all-phase de-energized state of the stepping motor, all motor windings having different phases are energized. After the all-phase de-energized state is detected, the motor windings are sequentially energized in accordance with predetermined phase energization patterns. Each of the energizations of the motor windings lasts for a given interval chosen to allow the stepping motor to generate a starting torque greater than a maximal load torque. After energizations of the motor windings corresponding to one cycle of the phase energization patterns are completed, durations of the energizations of the motor windings are gradually shortened to increase a rotational speed of the stepping motor.