Question

Explain the characteristics and applications of DC compound motor.

Hint:

DC compound motors offer a balance of high starting torque and stable speed, ideal for heavy load applications.

Answer 1

A DC compound motor combines the features of both shunt and series motors by having two field windings: a shunt winding (connected in parallel) and a series winding (connected in series with the armature). Characteristics:
It has good starting torque because of the series winding.
It provides nearly constant speed under varying loads due to the shunt winding.
Speed regulation is better than a series motor but not as good as a shunt motor.
It can handle sudden load changes without much speed fluctuation. Applications:
Used in elevators and hoists where high starting torque is required.
Suitable for presses and heavy-duty cranes.
Used in rolling mills and paper mills.