US 11,728,080 B2
Actuator
Javier Munoz Sotoca, Madrid (ES)
Assigned to OTIS ELEVATOR COMPANY, Farmington, CT (US)
Filed by Otis Elevator Company, Farmington, CT (US)
Filed on Dec. 30, 2019, as Appl. No. 16/730,030.
Claims priority of application No. 19382529 (EP), filed on Jun. 24, 2019.
Prior Publication US 2020/0402695 A1, Dec. 24, 2020
Int. Cl. H01F 7/16 (2006.01); H01F 7/121 (2006.01); B66B 5/16 (2006.01); H01F 7/08 (2006.01)
CPC H01F 7/121 (2013.01) [B66B 5/16 (2013.01); H01F 7/081 (2013.01); H01F 7/16 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electromechanical actuator device comprising:
a fixed part, a first movable part and a second movable part, each of said movable parts being arranged to move with respect to the fixed part along an actuation direction, wherein the fixed part, the first movable part, the second movable part, and a core of the fixed part each comprises a respective ferromagnetic material; and
a conductive coil wrapped around the core, said conductive coil being housed at least partially within the fixed part;
wherein the electromechanical actuator device is arranged such that:
the first movable part is coupled to the fixed part by at least one restorative component such that, in a working position, the first movable part is separated from the fixed part along the actuation direction by a first actuation distance; and
the second movable part is coupled to the first movable part by at least one second restorative component such that, in the working position, the second movable part is separated from the first movable part along the actuation direction by a second actuation distance;
when an electric current is passed through the conductive coil, an induced magnetic field attracts the first and second movable parts toward the fixed part, thereby reducing the first and second actuation distances;
wherein the fixed part is hollow and comprises a side wall, an open end and a closed end, such that the closed end and the side wall enclose the coil, wherein a face of the open end is arranged to abut a face of the first movable part when the electromechanical actuator device is in a reset position.