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. 25, 1988
Filed:
Aug. 25, 1986
Nobuo Mitsui, Katsuta, JP;
Yoshio Sakai, Naka, JP;
Masao Nakazato, Katsuta, JP;
Mitsuyuki Honbu, Katsuta, JP;
Shigeta Ueda, Hitachi, JP;
Seiya Shima, Katsuta, JP;
Katsu Komuro, Mito, JP;
Takeki Ando, Naka, JP;
Akiteru Ueda, Toukai, JP;
Kazuhiko Sasaki, Katsuta, JP;
Toshiaki Kurosawa, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An elevator control apparatus comprises an inverter device for supplying an induction motor for driving an elevator cage with AC electric power of variable voltage and frequencies and control equipment for controlling the output voltage and frequencies of the inverter device in response to signals produced in floors served by the elevator and in an elevator cage. The inverter device is constructed by a converter unit for converting AC electric power to DC electric power, at the input end of which a capacitor is connected in parallel with an AC electric source, an inverter unit for inverting the DC electric power converted in the converter unit into AC electric power, at the output end of which a capacitor is connected in parallel with an induction motor for driving the elevator cage and a DC reactor connected between the converter unit and the inverter unit. The thus constructed elevator control apparatus does not cause interference in electric appliances such as audio equipment, computer etc. existing within a building in which the elevator is installed.