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DC Generators
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Lap Winding
The difference among the winding type arise from the way the
coil ends are connected.
A lap winding may have one or more turns of anapproximately trapezoidal shape, with the two ends close to
each other so that they can be connected to adjacent
commutator segments.
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Developed diagram of a 4-pole, 8-coil, lap wound dc machine
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A polar-winding diagram of a 4-pole, -coil, lap wound dc machine
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!olar "inding #iagram of a $-pole,%& 'oil, (ap wound #'
machine with %& 'ommutator )egments
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*rush 'onnections and 'urrents in )ix parallel !aths of a lap-
"ound machine +perated as a enerator
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Wave Winding
The wave winding has the same basic trapezoidal appearance
in the coil body as the lap winding, but the coil ends are
spread apart.
The coil ends are connected to the commutator segments that
are one less or one more segment than the angular distance
between two lie polarity field poles.
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)implex #ouble layer "ave "inding or 4-!ole #' enerator
"ith %/ 'oils
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)ome 'ommon Terms
!ole !itch0 1t is defined as the number of armature conductors
per pole. 1f there are 2 coil sides and poles, pole pitch is
3256%2
'oil side0 1t is defined as the length of a wire laying the
magnetic field.
'oil0 Two coil side with there end connections from a coil.
The coil may be single turn or multi turn
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)ome 'ommon Terms 'oil !itch0 1t is defined as distance between two sides of a coil
in terms of armature slots. 1f the coil pitch is e7ual to pole pitch , the winding is said to be full pitch
Yc
YR
YB
YF
Lap Winding
Wave Winding
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ront !itch0 1t is defined as the distance between the second coil
side of one coil and the first coil side of the next coil
*ac !itch0 1t is defined as the distance measured in terms of
armature coil sides between two coil sides connected at the bac
end of armature to form a coil
8esultant !itch0 1t is defined as the distance between beginning
of one coil and the beginning of the next coil 'ommutator !itch0 The number of commutator segments
spanned by the two ends of a coil is called commutator pitch
)ome 'ommon Terms
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