A frictionless safety brake actuator (100; 200), for use in an elevator system (50), comprises at least two stators (104, 106); a magnet array (102) positioned between the stators (104, 106); a linkage (108) attached to the magnet array (102); and a biasing arrangement (118). The linkage (108) is actuatable to move a safety brake (58; 186) into frictional engagement with an elevator guide rail (56; 188). The magnet array (102) is moveable between a first position in which the linkage (108) is actuated and a second position in which the linkage (108) is not actuated. The biasing arrangement (118) is arranged to bias the magnet array (102) towards the first position. The magnet array (102) comprises a first magnet set and a second magnet set which comprise at least one magnet each and at least three magnets in total. The magnet(s) (130, 132) of the first magnet set is/are arranged alternately with the magnet(s) (134) of the second magnet set in a stack. The or each magnet in the first magnet set is an electromagnet (130, 132). The magnet array (102) produces a magnetic field (158, 168). The electromagnet(s) (130, 132) in the first magnet set and the magnet(s) (134) in the second magnet set each have a respective orientation (154, 156, 134, 164, 166) such that when a forward current (152) is supplied to the electromagnet(s) (130, 132), the magnetic field (158) is stronger on a first side of the magnet array (102) than on a second, opposing side of the magnet array (102), and when a reverse current (162) is supplied to the electromagnet(s) (130, 132), the magnetic field (168) is stronger on the second side than on the first side of the magnet array (102). The stators (104, 106) each comprise a respective array of discrete magnetic elements which have a staggered configuration.
FRICTIONLESS SAFETY BRAKE ACTUATOR
REIBUNGSLOSE SICHERHEITSBREMSBETÄTIGUNG
ACTIONNEUR DE FREIN DE SÉCURITÉ SANS FRICTION
2024-03-06
Patent
Electronic Resource
English
IPC: | B66B Aufzüge , ELEVATORS |