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. 29, 1988
Filed:
Sep. 28, 1987
Eiichi Ishii, Tokyo, JP;
Masuo Osuga, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A speed control system for a DC motor is disclosed. This system includes a first transistor connected between a first terminal and a reference terminal, a second transistor connected between a second terminal and the reference terminal, an error amplifier having first input terminal connected via a reference voltage circuit to the first terminal, a second input terminal connected to a third terminal and an output terminal connected to the bases of the first and second transistors, a first resistor connected between a power terminal and the second terminal, a second resistor connected between the first and third terminals, and a third resistor connected between the second and third terminals, and the motor is connected between the first terminal and the power terminal.