In other words, the generator which has both shunt and series fields is called the compound wound generators. If the magnetic flux produced by the series winding assists the flux produced by the shunt winding, then the machine is said to be cumulative compounded.

What are cumulative and differential compound generator?

When the series winding is connected to aid the shunt winding, the generator is called a cumulative compound-wound generator; if the series winding is connected to oppose the magnetic field, it's called a differential compound-wound generator.

What is compounded generator?

[′käm‚pau̇nd ′jen·ə′rād·ər] (electricity) A direct-current generator which has both a series field winding and a shunt field winding, both on the main poles with the shunt field winding on the outside.