Back to results
US 9,957,131 B2Granted
Elevator speed control
AssigneeOtis Elevator Company
InventorsIsmail Agirman, Edward Piedra
Life of this patent
Estimating the term…
Abstract
Embodiments are directed to calculating a current associated with a motor of an elevator based on an output of a speed regulator, and controlling the elevator based on the current. Embodiments are directed to examining a feeder current obtained via a converter current sensor of a regenerative drive during a peak power condition, and regulating a speed of an elevator based on the feeder current.
Claims10
A method comprising:
- calculating a current associated with a motor of an elevator based on an output of a speed regulator;
- and
- controlling the elevator based on the current;
- comparing the current to a limit associated with at least one of a drive and the motor,
- wherein controlling the elevator comprises finishing an elevator run when the comparison indicates that the current is less than the limit, and
- wherein controlling the elevator comprises at least one of (i) halting the elevator, (ii) slowly bringing the elevator to a stop and running the elevator back to an initial position, and (iii) reducing a speed reference and having the elevator proceed to an initial landing, when the comparison indicates that the current is greater than the limit.
3 more elements
A system comprising:
- a speed regulator configured to receive a speed feedback and a speed reference and generate a torque current reference;
- a controller configured to control an elevator's operation based on the torque current reference;
- wherein the controller is configured to compare the torque current reference to a limit associated with at least one of a drive and the motor,
- wherein the controller is configured to perform:
- controlling the elevator comprises finishing an elevator run when the comparison indicates that the torque current reference is less than the limit, and
- controlling the elevator comprises at least one of (i) halting the elevator, (ii) slowly bringing the elevator to a stop and running the elevator back to an initial position, and (iii) reducing a speed reference and having the elevator proceed to an initial landing, when the comparison indicates that the current is greater than the limit.
3 more elements
Dependencies are inferred from the claim text.