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CUMULATIVE COMPOUND MOTOR

It is one in which series field is so connected that it assists the field due to shunt winding.The armature torque is increased under heavy load at starting.As the load increases,the speed decreases in the same way as in series motor.When the load is increased suddenly the shunt field prevents the motor from speeding up beyond the safe value.

DIFFERENTIAL COMPOUND MOTOR

It is one in which winding is so connected that the field due to it opposes that due to shunt winding.It tends to keep the speed constant.When starting up the motor,the series windin is required to be short circuited otherwise the series field winding would rise to its full value before shunt field.This will cause the motor to start in the wrong direction,at high speed.

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