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:
Sep. 10, 1991
Filed:
Jun. 28, 1990
Satomi Yamauchi, Aichi, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a motor control apparatus and a motor controlling method, when a connector is disconnected while an operation signal is ON, an excitation current component signal becomes zero and does not reach a predetermined value even after a predetermined period of time. In this case, a current component signal discriminating circuit discriminates that an amplitude of the excitation current component signal is equal to or less than the predetermined value, a timer issues an alarm signal because the predetermined period has passed from input of the operation signal, and a stop circuit stops operation of an inverter upon reception of the alarm signal, so that the inverter is prevented from breakdown.