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:
Jun. 24, 1980
Filed:
Jun. 17, 1977
Nobuo Anzai, Inazawa, JP;
Eiki Watanabe, Inazawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An elevator control apparatus comprises a thyristor power rectifier connected to an AC power source and for driving a DC motor for cage drive; a power stoppage detector for detecting the power stoppage of the AC power source; and a series circuit including a capacitor and switching connected in series with the capacitor. The series circuit is connected across the thyristor power rectifier. Before a cage starts its travel, the capacitor is charged through the thyristor power rectifier, with the polarity which depends on the traveling direction of the cage. At the power stoppage, the capacitor is discharged through the thyristor power rectifier, in response to a switching operation of the switching element.