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:
May. 07, 2002
Filed:
Apr. 28, 2000
Kunio Tanaka, Osaka, JP;
Keyence Corporation, Osaka, JP;
Abstract
One terminal of the DC motor is connected to the power supply terminal , and the other terminal of the DC motor is connected to the ground terminal through the FET . The FET is connected between the terminal and terminal of the DC motor . A reversal input terminal of the comparator is connected to the terminal of the DC motor , and a non-reversal input terminal of the comparator is connected to the terminal of the DC motor . The output terminal of the comparator is connected to the gate of the FET through the switch SW . The CPU supplies a control signal FV which is changed at a predetermined period T according to the speed signal supplied from the receiver , to the gate of the FET through the driver . When the counter electromotive force is generated in the DC motor , the comparator supplies a high level control signal RD to the gate of the FET through the switch SW