The KG series are housed DC-drives with revolving armatures. These can be designed as series (universal motor) or shunt motor. The series motor has a high starting torque, but its speed is heavily load-dependent. The speed of the shunt motor remains nearly constant and is controlled by the armature voltage.The KG series are housed dc-drives with commutators. These can be designed as a series (universal motor) or shunt motor. The series motor has a large starting torque, but the speed depends strongly on the load. The shunt motor is speed stiff. The speed is controlled by the armature voltage.