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:
Aug. 20, 2002
Filed:
Feb. 12, 2001
Hiroshi Araki, Tokyo, JP;
Shinobu Tajima, Tokyo, JP;
Ikuro Suga, Tokyo, JP;
Kazuyuki Kobayashi, Tokyo, JP;
Other;
Abstract
An elevator control device includes: a convertor which rectifies a.c. power and converts the a.c. power into d.c. power; an inverter which converts the d.c. power into a.c. power having a variable voltage and a variable frequency; an electric motor which is driven by the a. c. power having a variable voltage and a variable frequency to operate an elevator; a power storing unit which is charged with electric power; a required-power arithmetically operating circuit which calculates power required by the elevator, which is an electric power required for the operation of the elevator or an electric power caused by the operation of the elevator; and a charging/discharging control circuit which controls charging and discharging of the power storing unit based on the power required by the elevator.