What about the transformer next to the dormitory bed?
DC shunt motor excitation winding and armature winding are connected in parallel, and as a generator, is the terminal voltage of motor itself from the excitation winding power supply; as the shunt motor, excitation winding and the armature
No connection between magnetic winding and armature winding, and the other by the DC power supply of DC motor excitation winding power supply called excited DC motor, permanent magnet DC motor can also be seen as excited or self-excited DC motor, generally called for permanent magnet direct excitation mode.
