DC Generators
In case of D.C. machine winding, number of commutator segments is equal to

Number of armature coil sides
Number of armature turns
Number of armature conductors
Number of armature coils

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DC Generators
When two D.C. generators are running in parallel an equalizer bar is used

To increase the series flux
So that the two identical machines will pass approximately equal currents to the load
To increase the generated e.m.f.
To reduce the combined effect of armature reaction of both the machines

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DC Generators
Wave winding is composed of

Any even number of conductors
That even number which is exact multiple of poles
Any odd number of conductors
That even number which is exact multiple of poles + 2

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