Patent ID: 8541963

Claim:
An electrodynamic braking device for a universal motor having a field winding ( 2 , 2 ′) and an armature ( 1 ), having a switching device (S 1 -S 6 , S 8 , 3 , v, v′, v″) for switching from a motor mode to a braking mode, wherein the braking device is designed to supply the armature ( 1 ) and the field winding ( 2 , 2 ′) with an alternating current of a power grid ( 50 , 51 ) during the motor mode, wherein said braking device is designed to short circuit said armature ( 1 ) and to continue to supply said field winding ( 2 , 2 ′) with an alternating current from the power grid ( 50 , 51 ) during the braking mode, wherein said braking device is designed to supply said field winding ( 2 , 2 ′) with a current having an A.C. voltage which has the frequency of said power grid in a first phase of said braking mode and wherein said braking device is designed to supply the field winding ( 2 , 2 ′) with an alternating current from said power grid which has a frequency that is reduced with respect to the frequency of said power grid in a further phase of the braking mode.