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. 13, 2002
Filed:
Dec. 21, 2000
Shinobu Tajima, Tokyo, JP;
Hiroshi Araki, Tokyo, JP;
Ikuro Suga, Tokyo, JP;
Kazuyuki Kobayashi, Tokyo, JP;
Other;
Abstract
To reduce total power required to drive an elevator by a commercial power supply during a peak power-consumption time period, for instance, an afternoon in summer time, a control apparatus includes a converter for rectifying AC electric power into DC electric power; an inverter for inverting the DC electric power into AC electric power having a variable voltage and a variable frequency; a motor driven by the AC electric power having the variable voltage and the variable frequency to operate an elevator; a power storage apparatus for storing electric power; and a charge/discharge control for controlling charging and discharging operation of the power storage apparatus based upon a charging target value.