Patent ID: 11897725
Assignee: OTIS ELEVATOR COMPANY
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A method of engaging an electromagnetic brake for an elevator system comprising:
detecting one or more operational characteristics of the elevator system;
selecting a first position, a second position or a third position of a switching mechanism disposed at a brake control circuit depending on the one or more detected operational characteristics;
flowing electrical current through one or more components of the brake control circuit, depending on the position of the switching mechanism, to determine a rate of engagement of the electromagnetic brake; and
stopping a flow of electrical current through the brake control circuit, thereby causing engagement of the electromagnetic brake;
wherein in the first position the switching mechanism closes on a first pathway to direct electrical current along the first pathway having a snubber diode to slow dissipation of current in the control circuit in an event of a loss of AC power to the control circuit; and
wherein in the second position the switching mechanism closes on a second pathway to direct electrical current along the second pathway arranged in parallel to the first pathway and including a snubber diode and a resistor; and
wherein in the third position the switching mechanism is in an open position such that deceleration is not delayed.