Patent ID: 7108110

Claim:
A braking device for an electric motor with a stator ( 14 , 16 , 18 ) and a rotor ( 10 ) composing: a braking element ( 20 ) that can be moved between an operating position and a braking position depending on a magnetic flux in the stator ( 14 , 16 , 18 ), wherein there is an air gap ( 32 ) between the braking element ( 20 ) and the stator ( 14 , 16 , 18 ), and with a short-circuit ring ( 38 ) for suppressing mechanical vibrations, wherein a surface enclosed by the short-circuit ring ( 38 ) is inclined in relation to a boundary surface ( 42 ) of the braking element ( 20 ) in relation to the air gap ( 32 ) between the stator ( 14 , 16 , 18 ) and the braking element ( 20 ), wherein the magnetic flux traveling through the braking element ( 20 ) is comprised of a main magnetic flux (I H ) flowing through the short-circuit ring ( 38 ) and a secondary magnetic flux (I N ) that bypasses the short-circuit ring ( 38 ), and wherein the air gap ( 32 ) between the braking element ( 20 ) and the stator ( 14 , 16 , 18 ) is smaller in the region of the main magnetic flux (I H ) than in the region of the secondary magnetic flux (I N ).