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:
Jan. 21, 2014
Filed:
Jul. 25, 2008
Helmut Schroeder-brumloop, Berlin, DE;
Marvin Dehmlow, Berlin, DE;
Ingo Engelhard, Berlin, DE;
Andreas Tutat, Berlin, DE;
Helmut Schroeder-Brumloop, Berlin, DE;
Marvin Dehmlow, Berlin, DE;
Ingo Engelhard, Berlin, DE;
Andreas Tutat, Berlin, DE;
Otis Elevator Company, Farmington, CT (US);
Abstract
An elevator system and associated method includes power control for operating an elevator () in an emergency mode wherein the elevator () includes a car (), a drive motor (), a motor drive unit () which supplies power to the drive motor () and controls the same and an emergency power supply (). The motor drive unit () has a predetermined normal operation switching frequency. In an emergency mode, power is supplied to the motor from the emergency power supply () while the motor drive unit is in an emergency mode. An actual emergency operation condition characteristic is determined for setting the switching frequency of the motor drive unit () dependent on the actual emergency operation condition characteristic.