To improve the torque

Reduce the field current

To decrease the back emf

To prevent increase in speed

Shunt motor

Series motor

Differential compound motor

Cumulative compound motor

Voltage control method

Field diverter control method

Armature diverter method

Series field tapping method

Field control

Armature control

Field diverter control

Ward-Leonard system control

Insulate slots

Bind the coils

Wrap the conductor

Insulate exposed conductors