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:
Jul. 14, 1992
Filed:
Jan. 02, 1991
Kenji Oshima, Yokohama, JP;
Yasutami Kito, Kasugai, JP;
Otis Elevator Company, Farmington, CT (US);
Abstract
An inverter control device for controlling an induction motor that drives elevators, has two induction motor coils that are electrically separate with inverters connected to each coil, and a control device that controls these two inverters with the same current command. The preferred structure is one where one control system outputs one current command to two inverters, the inverter control device has two separate control systems that divide one current command and output each half to the respective inverter and one carrier circuit that modulates each control system at the same timing, or two separate converters are connected to the power element of the respective inverters.