Separately Excited DC Motor
There is no connection between the field winding and the armature winding, and the DC motor powered by other DC power supply to the field winding is called separately excited DC motor, permanent magnet DC motor can also be regarded as separately excited or self-excited DC motor, generally directly called excitation The method is permanent magnet.
Shunt Excited DC Motor
The field winding of the shunt-excited DC motor is connected in parallel with the armature winding. As a shunt generator, the terminal voltage from the motor itself supplies power to the field winding; as a shunt motor, the field winding and the armature share the same power supply , In terms of performance, it is the same as the separately excited DC motor.
Series Excited DC Motor
After the field winding of the series-excited DC motor is connected in series with the armature winding, it is connected to the DC power supply. The excitation current of this DC motor is the armature current.
Compound Excitation DC Motor
Compound-excited DC motors have two excitation windings: shunt excitation and series excitation. If the magnetomotive force generated by the series winding is in the same direction as the magnetomotive force generated by the shunt winding, it is called product compound excitation. If the two magnetomotive forces have opposite directions, it is called differential compound excitation.
DC motors with different excitation methods have different characteristics. In general, the main excitation modes of DC motors are shunt excitation, series excitation and compound excitation, and the main excitation modes of DC generators are separate excitation, shunt excitation and compound excitation.