Question

What changes must be done in arrangement to convert ac generator to dc generator?

Answer 1

The Voltage generated in the armature, placed in a rotating Magnetic Field, of a DC generator is alternating in nature. The commutation in DC machine or more specifically commutation in DC generator is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes. Again in DC Motor, the input DC is to be converted in alternating form in armature and that is also done through commutation. This transformation of current from the rotating armature of a DC machine to the stationary brushes needs to maintain continuously moving contact between the commutator segments and the brushes.
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Answer 2

just replacing the split rings to slip rings is enough