Armature Windings :
Now, we will discuss the winding of an actual armature. But before doing this, the meaning of the following terms used in connection with
armature winding should be clearly kept in mind.
Pole Pitch :
It may be variously defined as :
(i) The periphery of the armature divided by the number of poles of the generator
i.e. the distance between two adjacent poles.
(ii) It is equal to the number of armature conductors (or armature slots) per pole. If there are 48
conductors and 4 poles, the pole pitch is 48/4 = 12.
Coil :
With reference to Fig, the two conductors AB and CD along with their end connections
constitute one coil of the armature winding. The coil may be single-turn coil or multiturn coil . A single-turn coil will have two conductors. But a multi-turn coil may have many conductors per coil side. In fig for example, each coil side has 3 conductors. The
group of wires or conductors constituting a coil side of a multi-turn coil is wrapped with a tape as a
unit (Fig. 26.23) and is placed in the armature slot. It may be noted that since the beginning and the
end of each coil must be connected to a commutator bar, there are as many commutator bars as coils
for both the lap and wave windings (see Example 26.1)
here side of a coil (1-turn or multiturn) is called a winding element. Obviously, the number of
winding elements is twice the number of coils.
In the Next Post I will post about Pitch Factor and Wdg Types Stay Tuned
Now, we will discuss the winding of an actual armature. But before doing this, the meaning of the following terms used in connection with
armature winding should be clearly kept in mind.
It may be variously defined as :
(i) The periphery of the armature divided by the number of poles of the generator
i.e. the distance between two adjacent poles.
(ii) It is equal to the number of armature conductors (or armature slots) per pole. If there are 48
conductors and 4 poles, the pole pitch is 48/4 = 12.
Coil :
With reference to Fig, the two conductors AB and CD along with their end connections
constitute one coil of the armature winding. The coil may be single-turn coil or multiturn coil . A single-turn coil will have two conductors. But a multi-turn coil may have many conductors per coil side. In fig for example, each coil side has 3 conductors. The
group of wires or conductors constituting a coil side of a multi-turn coil is wrapped with a tape as a
unit (Fig. 26.23) and is placed in the armature slot. It may be noted that since the beginning and the
end of each coil must be connected to a commutator bar, there are as many commutator bars as coils
for both the lap and wave windings (see Example 26.1)
here side of a coil (1-turn or multiturn) is called a winding element. Obviously, the number of
winding elements is twice the number of coils.
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