Title:
エレベータシステム
Document Type and Number:
Japanese Patent JP4022281
Kind Code:
B2
Abstract:
The invention provides an elevator system for controlling movement of an elevator car with respect to guide rails in an elevator hoistway, having a force-estimation or position-scheduled current command controller and a magnet driver circuit without the need for a flux sensor. The force-estimation or position-scheduled current command controller responds to a force command signal, and further responds to a sensed gap signal, for providing a force-estimation or position-scheduled current command controller signal as a current command to the magnet driver circuit. The magnet driver circuit responds to the force-estimation or position-scheduled current command controller signal, for providing a magnet driver circuit signal to control said horizontal movement of the elevator car with respect to the guide rail in the elevator hoistway, whereby the horizontal movement of the elevator car is controlled without sensing magnetic flux. Other applications include any system that uses an electromagnet to produce an attractive or repulsive force across a large air gap, such as magnetic levitation trains or shuttles, and magnetic bearings.
Inventors:
Timothy W. Lemmers
Randal Kay Roberts
Rajesh Rajamani
Roy S. Colby
Randal Kay Roberts
Rajesh Rajamani
Roy S. Colby
Application Number:
JP7962097A
Publication Date:
December 12, 2007
Filing Date:
March 31, 1997
Export Citation:
Assignee:
OTIS ELEVATOR COMPANY
International Classes:
B66B11/02; B60L13/08; B66B1/06; B66B7/04; F16C39/06
Domestic Patent References:
| JP7196273A |
Attorney, Agent or Firm:
Tsuyoshi Hashimoto