Shunt motor is suitable for electric trains

Series motor is suitable for machine tools

Series motor is suitable for belt driven machines

Compound motor is suitable for fly-wheel drive

D.C. shunt motor

D.C. series motor

Cumulative compound motor

Differential compound motor

Line voltage too high

Short-circuit in the field winding

Pitted starter contact terminals

Wrong grade of carbon brushes

Increasing the back e.m.f. with a resistor

Limiting the armature current with a shunt resistor

Changing the voltage with a starter

Changing the field current by a field rheostat

50%

25%

150%

200%