US 12,078,218 B2
Silent electromagnetic brake
Tuukka Korhonen, Helsinki (FI); and Jorma Mustalahti, Helsinki (FI)
Assigned to KONE Corporation, Helsinki (FI)
Filed by KONE Corporation, Helsinki (FI)
Filed on Feb. 20, 2020, as Appl. No. 16/796,443.
Claims priority of application No. 19164573 (EP), filed on Mar. 22, 2019.
Prior Publication US 2020/0300319 A1, Sep. 24, 2020
Int. Cl. F16D 65/14 (2006.01); F16D 55/226 (2006.01); F16D 65/00 (2006.01); F16D 65/18 (2006.01); F16D 121/20 (2012.01)
CPC F16D 65/18 (2013.01) [F16D 55/2262 (2013.01); F16D 65/0006 (2013.01); F16D 2121/20 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An electromagnetic brake comprising:
an electromagnet arranged about a central axis;
a slide movable with respect to the electromagnet in a slide actuation direction upon actuation of the electromagnet; and
an air gap provided between the electromagnet and the slide through which a magnetic field passes when the electromagnet is actuated, wherein
the slide is arranged radially inside or outside of the electromagnet with respect to the central axis,
the electromagnet comprises a coil wound about the central axis such that the coil surrounds the air gap in a plane transverse to the central axis, the coil being adapted to generate the magnetic field upon excitation,
the electromagnetic brake further comprises a magnetic field adaption device for adapting the magnetic field so as to generate a magnetic force acting on the slide in the slide actuation direction,
the magnetic field adaption device comprises
an electromagnet projection projecting from the electromagnet into the air gap; and
a slide projection projecting from the slide into the air gap, and
the electromagnet projection and the slide projection are offset from each other in the slide actuation direction in the state of the electromagnet not being actuated.