Patent ID: 6459182
Filing Date: 2002-10-01
Classification: H02K

Abstract:
A prefabricated brake being assembled as a preassembled part for being mounted by screw means to an electric motor comprising a housing having a brake-mounting end shield at one end of the housing and a rotor comprising a rotor shaft passing through an aperture in said end shield and projecting from said end shield, said prefabricated brake comprising:a brake housing forming a cavity defined by said brake housing and closed by said brake-mounting end shield of said electric motor and in which a brake coil and an associated magnetic body are mounted, an armature which is nonrotatably fixed in a guide mechanism formed in said cavity of said brake housing but can be displaced in a direction parallel of said rotor shaft by an electromagnetic pulling force generated by said brake coil and said associated magnetic body, spring means for pushing said armature in a direction opposite to said pulling force, a brake rotor for being nonrotatably but axially displacably mounted on said rotor shaft, a friction sheet being fixed to said brake housing, wherein, when said prefabricated brake is mounted to said electric motor, said armature, brake rotor and friction sheet being arranged so that when no electrical current is flowing through said brake coil, said spring means are pushing said armature against said brake rotor pressing said brake rotor against that friction sheet which is pressed to said brake mounting end shield so that, when said brake rotor is rotating together with said rotor, braking forces and heat generated by friction between said braking rotor and said friction sheet is transferred to said brake mounting end shield, and wherein, when said prefabricated brake is dismounted from said brake-mounting end shield of said electric motor, said friction sheet holds said spring means, said armature and said brake rotor within said cavity of said brake housing.