US 12,420,287 B2
Eddy current brake for a crusher
Leon Paul Heinrich Bei Der Sandwisch, Neuenkirchen (DE); and Guido Leuschen, Bielefeld (DE)
Assigned to Metso USA Inc., Brookfield, WI (US)
Filed by Metso USA Inc., Brookfield, WI (US)
Filed on Feb. 16, 2023, as Appl. No. 18/169,930.
Prior Publication US 2024/0278252 A1, Aug. 22, 2024
Int. Cl. B02C 4/42 (2006.01); B02C 1/02 (2006.01); B02C 1/04 (2006.01); B02C 1/08 (2006.01); B02C 2/00 (2006.01); B02C 4/10 (2006.01); H02K 49/00 (2006.01); H02K 49/04 (2006.01); H02K 49/10 (2006.01)
CPC B02C 4/42 (2013.01) [B02C 4/10 (2013.01); H02K 49/043 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A crusher for crushing a supply of mineral material, the crusher comprising:
a stationary crushing member;
a moving crushing member spaced from the stationary crushing member by a crushing gap, wherein the moving crusher member is a crushing roller mounted to an eccentric shaft such that a rotation of the eccentric shaft creates an eccentric movement of the crushing roller toward and away from the stationary crushing member to change the crushing gap and crush the mineral material within the crushing gap; and
an inductive current braking system operable to create a magnetic braking force to restrict a rotational movement of the crushing roller, wherein the inductive current braking system comprises:
a braking yoke including a magnetic material; and
a braking disc formed from an electrically conductive material that is received in the braking yoke,
wherein the braking yoke and the braking disc are rotationally movable relative to each other to induce the magnetic braking force that restricts the rotational movement of the crushing roller.
 
6. A braking system for use with a crusher having a stationary crushing member and a moving crushing member that are spaced from each other to define a crushing gap, the moving crushing member including a crushing roller mounted to an eccentric shaft such that a rotation of the eccentric shaft creates an eccentric movement of the crushing roller relative to the crushing gap, the braking system comprising:
a braking disc formed from an electrically conductive material; and
at least one braking yoke including a magnetic material, wherein the braking disc and the at least one braking yoke are mounted on the crusher such that a relative movement between the braking disc and the at least one braking yoke induces a magnetic braking force that opposes a rotational movement of the moving crushing roller.
 
13. A compact eccentric crusher having a stationary jaw and a crushing roller mounted to an eccentric shaft such that a rotation of the eccentric shaft creates an eccentric movement of the crushing roller into and out of a crushing gap, the crusher comprising:
at least one braking yoke is mounted for a rotational movement with the crushing roller;
a stationary braking disc formed from an electrically conductive material that is received in the at least one braking yoke, wherein the at least one braking yoke rotates around the braking disc, wherein rotation of the at least one braking yoke relative to the braking disc induces a magnetic braking force that opposes the rotational movement of the crushing roller.