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:
Oct. 03, 1989
Filed:
Apr. 08, 1988
Kouichi Ishizaka, Saitama, JP;
Akimitsu Ebina, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
A motor speed control apparatus includes a ladder resistor circuit, a reference signal generator, and a comparator. The ladder resistor circuit selectively receives a voltage signal having a predetermined amplitude at a plurality of nodes. The ladder resistor circuit arranged to change an output voltage value thereof in accordance with a voltage application position. The level of the reference signal generator is periodically changed. The comparator compares a voltage value of the reference signal with an output voltage value of the ladder resistor circuit and outputs a pulse output having a variable pulse width on the basis of a comparison result. A motor speed is controlled on the basis of the pulse output.