When is a compound DC motor particularly suitable?

A compound DC motor is particularly suitable when high starting torques are required due to its unique design that combines series and shunt field windings. The series winding, which has a lower resistance and carries the full load current, provides a boost in magnetic field strength when starting, resulting in a significant starting torque.

This characteristic is advantageous in applications such as cranes, elevators, and other machinery that requires a strong force to begin movement, facilitating smooth operation from a standstill. The combination of series and shunt windings helps maintain stable performance under varying load conditions, making the compound motor versatile and effective in demanding scenarios where high torque is essential at startup.