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US 10,479,645 B2Granted
Electromagnetic brake system for elevator application
AssigneeOtis Elevator Company
InventorsAmir Lotfi, David J. Lanesey
Life of this patent
Estimating the term…
Abstract
A brake system for an elevator car includes a multiple of brake segments to control a timing and a rate of brake torque for deceleration of the elevator car, a first of the multiple of brake segments includes a first electromagnetic coil with a characteristic different than a second electromagnetic coil of a second of the multiple of brake segments.
Claims10
A brake system for an elevator car for an E-stop operation after loss of power comprising:
- a first brake segment operable to apply a first brake torque at a first time;
- a second brake segment sequentially operable subsequent to the first brake segment, the second brake segment operable to apply the first brake torque at a second time subsequent to the first time;
- and
- a third brake segment sequentially operable subsequent to the second brake segment, the third brake segment operable to apply the first brake torque at a third time, the third time is about equal to the second time, wherein the first, the second, and the third brake segment are sequentially operated to stop 125% of a rated load of the elevator car, each of the multiple of sequentially operated brake segments includes an electromagnetic coil that controls the timing and the rate of brake torque for that brake segment, the first brake segment includes a first electromagnetic coil with a characteristic different than a second electromagnetic coil of the second brake segment and a third electromagnetic coil of the third brake segment.
1 more element
A method of engaging an electromagnetic brake for an elevator system upon initiation of an E-stop operation after loss of power, comprising:
- controlling a multiple of brake segments to sequentially control application of a multiple of brake segments for deceleration of the elevator car by applying a first brake segment to prevent an overspeed condition prior to applying a second, and a third brake segment of the multiple of brake segments;
- and
- applying an about equal torque from each of the second, and the third brake segment subsequent to the first brake segment, the torque from the first brake segment less than a torque from each of the second, and the third brake segment, the multiple of brake segments sequentially operated to stop 125% of a rated load of the elevator car.
Dependencies are inferred from the claim text.