Patent ID: 11897730
Assignee: OTIS ELEVATOR COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  F  H | IPC B  F  H

Claim 1:
2. The frictionless safety brake actuator (100; 200) of claim 1, wherein
the respective orientations (154, 156, 134, 164, 166) of the electromagnet(s) (130, 132) of the first magnet set and of the magnet(s) (134) of the second magnet set all lie in a plane that is parallel to the axis (115) and perpendicular to the first and second stators (104, 106);
the first and second magnet sets comprise a total of N magnets arranged in N positions indexed from n=1 to n=N along the axis (115), wherein the electromagnet(s) (130, 132) of the first magnet set and the magnet(s) (134) of the second magnet set are oriented such that, when a forward current (152) is being applied to the electromagnet(s) (130, 132) of the first magnet set, for n=1 to n=N−1, the (n+1)th magnet has an orientation that is rotated by 90° with respect to the orientation of the nth magnet in a first rotational direction, and when a reverse current (162) is being applied to the electromagnet(s) (130, 132) of the first magnet set, for n=1 to n=N−1, (n+1)th magnet has an orientation which is rotated by 90° with respect to the nth magnet in a second rotational direction which is opposite to the first rotational direction.