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. 07, 2008
Filed:
Nov. 16, 2006
Tomoharu Yokouchi, Osaka, JP;
Keisuke Kuroda, Osaka, JP;
Tomoharu Yokouchi, Osaka, JP;
Keisuke Kuroda, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A motor driving apparatus includes a speed control circuit for outputting a speed control signal on the basis of a target speed command and rotating speed information of a motor, a PWM signal generating circuit for generating and outputting a PWM signal on the basis of the speed control signal, a switching circuit for feeding power to motor windings on the basis of the PWM signal, and a protection circuit including a full torque detecting circuit for detecting a full torque status in which the speed control signal is a signal for instructing maximum torque. The protection circuit outputs a signal for stopping the switching circuit when the full torque detecting circuit detects a full torque status continuously for a specified time.