Characteristics of D.C. compound motors:



In dc compound motors both shunt field and series field will be acting simultaneously. In cumulative compound motors the series field assists the shunt field. In such motors when armature current increases the field flux increases. So for given armature current the torque developed will be greater and speed lower when compared to a shunt motor. In differentially compounded motors the series field opposes the shunt field. Therefore when armature current increases the field flux decreases. So for given armature current, the torque developed will be lower and the speed greater when compared to shunt motor.



Torque Vs armature current and speed Vs armature current characteristics of dc compound motors are shown in the following figure.



The speed Vs torque characteristics are compared with that of shunt motor as shown in the following figure.


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