Patent ID: 6321883
Filing Date: 2001-11-27
Classification: F16D,H02K

Abstract:
An electromagnetically actuated brake in an electric motor comprising:a shaft rotatable about its long axis;a brake rotor mounted on the shaft in a rotationally stable manner and comprising a braking surface by means of which the shaft can be braked;a magnetic body which can be energized electromagnetically to produce a magnetic force;a spring-loaded armature plate which is mounted on the shaft and is movable axially parallel to the long axis of the shaft by the magnetic force produced in the magnetic body against the force of its spring-loading whereby in a braked state the armature plate is apposed to the braking surface of the brake rotor;at least one compression spring to generate the spring-loading of the armature plate whereby when the magnetic body is de-energized, the armature plate is pressed against the brake rotor by the spring-loading;and for damping oscillations during change from said braked state to a non-braked state and during said non-braked state when the magnetic force is produced, further comprisinga first damping means made of a solid material with a high load-bearing capacity which is located between the armature plate and the magnetic body;and a second damping means which is attached to the first damping means in the axial direction of the shaft and which comprises a flexible material; andwherein said first and second damping means are provided for coming into contact over substantially its entire area with said magnetic body and said armature plate during said non-braked state, and wherein said first and second damping means are not attached to and separate from said armature plate.