Introduction to DC Armature Windings
There are two kinds of dc armature windings that are the lap and wave windings. For development of dc armature windings, a number of pitches related to the types of dc armature windings are back pitch, Front pitch and Winding pitch.
Back Pitch, Yb: Back pitch is the distance among the two active sides of similar coil under adjacent opposite poles. For double layer winding,
Equation: Yb = (2c/p) + K
Where K stands for = any integer or fraction, added or subtracted with 2C/P which will provide the value of Yb an odd integer.
Front Pitch, Yf: Front pitch is the distance among two coil sides connected to the same commutator segment. It has to be an odd integer.
Winding Pitch or Coil Pitch, Y: Winding pitch or coil pitch is the distance among starting ends of two consecutive coils expressed in terms of coil sides.
For a double layer winding, winding pitch has to be an even integer.
Y = + 2m (for lap winding)
Y = (2C + 2m)/(P/2) (for wave winding)
In which m = 1, 2, 3 for simplex, duplex and triplex windings correspondingly,
P stands for = number of poles, and
C stands for = number of coils. + Sign points out progressive winding and - sign points out retrogressive winding.
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