What is the difference between cumulative and differential connections of dc compound motor or generator?

Answer 1

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.

Answer 2

Well, sweetheart, the difference between cumulative and differential connections in a DC compound motor or generator lies in how the series and shunt fields are connected. In cumulative connection, both series and shunt fields aid each other, resulting in higher overall field strength. In differential connection, the series and shunt fields oppose each other, leading to a weaker overall field strength. So, pick your poison, depending on whether you want more power or less power.

Answer 3

in case of cumulative generator series field flux and main field flux are of same direction and in case of a differential compound generator series field flux and main field flux opposes each other.