maintenance free, electromagnetic lüftbare federdruckbremse with novel electrical ansteuerungsschaltung for solenoids

摘要

An electromagnetically releasable spring pressure brake has a stationary coil-bearing housing (1) with a ring-shaped magnet coil (2) and a friction lining rotor (5) that cooperates with a non-revolving, but axially movable armature core disk (4) in order to press the friction lining against a shaft housing or end shield when no current is flowing through the magnet coil, the coil-bearing housing (1) being secured to the shaft housing or end shield. The spring pressure brake also has an electric driving circuit (10) for the magnet coil (2) for driving the same when the brake is released with a considerably increased power in comparaison with the power required to normally hold the brake in the released position. In order to obtain a brake having a simple design, a reduced heat load, short operating and releasing times and no air gap adjustment, the driving circuit (10) has a phase control (32) and means (20) for generating an overexcitation delay. In order to release the brake, the overexcitation delay generator drives the phase control (32) driving circuit (22) so that the firing angle is generated only after a predetermined overexcitation time has elapsed during which the magnet coil is excited by an overexcitation voltage, and afterwards the phase control (32) reduces the power applied to the magnet coil (2) by phase controlling.