In series with armature
In parallel with armature
In series with shunt field
In parallel with shunt field
Build up the voltage
Reduce the field current
Reduce armature current
Maintain constant output voltage
Resistance between the opposite brushes
Resistance between brush and commutator raiser
Resistance between brush and commutator
Resistance between brush and armature conductors
Long shunt compound
Cumulative compound
Differential compound
Short shunt compound
Reduce the copper loss
Reduce the friction loss
Reduce the hysteresis loss
Reduce the eddy current loss