Patent ID: 6998804

Claim:
A system for operating an electric motor having a field winding and a commutating armature in an operating mode and a braking mode, comprising: the commutating armature electrically connected on a first side to a supply voltage and on a second side to a first side of the field winding; the field winding electrically connected on a second side to a side of a first triac; said first triac electrically connected on a second side to the supply voltage; a first controller, electrically connected to said first triac for controlling said first triac; a first diode, a second triac and a second diode; said first diode having an anode electrically connected to the first side of the commutating armature; said second triac electrically connected on a first side to the second side of the commutating armature; said second diode having an anode electrically connected to the second side of the field winding; said first and second diodes having respective cathodes electrically connected to each other and electrically connected to a second side of said second triac; and a second controller, electrically connected to said second triac for controlling said second triac.