Start jerk reduction for an elevator
AssigneeOtis Elevator Company
InventorsRaj Kantesaria, Mark E. Shepard, Donald F. Cominelli
Life of this patent
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Abstract
At the beginning of a run of an elevator 4, from an elevator control 14 a stiction removing velocity signal 20 is provided to a drive control 24 for commanding the elevator until stiction is broken; then as soon as the elevator 4 moves a normal dictated velocity signal 21 controls the elevator 4 throughout the remainder of the run. In further accordance with the present invention, the stiction removing velocity signal 20 is provided prior to the dictated velocity signal 21 only when the elevator 4 is operating in a regenerative mode, as determined by the elevator 4 moving in the up direction while lightly loaded or moving in the down direction while heavily loaded.
Claims20
A method of reducing start jerk in an elevator, comprising the steps of:
- detecting the lifting of an elevator brake at the beginning of an elevator run;
- providing a variable removing velocity signal to a drive control after the lifting of said brake;
- providing a dictated velocity signal to said drive control in response to an event and for the duration of said elevator run.
An elevator system, comprising:
- an elevator controller, responsive to a lift signal from an elevator brake for providing a variable stiction removing velocity signal to a drive control until an event and for providing a dictated velocity signal after said variable event;
- an elevator drive, responsive to said stiction removing velocity signal and dictated velocity signal for providing a torque signal to an elevator motor;
- an elevator motor, responsive to said drive signal for moving an elevator.
Dependencies are inferred from the claim text.