2. Both the front and back pitches must be odd in simplex windings.
3. The average pitch should be approximately equal to the number of inductors divided by the number of poles.
This condition must obtain in order that the electric pressures induced in inductors moving simultaneously under poles of opposite sign, will be added. The smallest pitch meeting this condition would stretch completely across a pole face, while the largest would stretch from the given pole tip to the next pole tip of like polarity.
The choice of front and back pitch for a given number of inductors should, with lap and wave windings in general, comply with the following conditions:
1. All the coils composing the winding must be similar, both mechanically and electrically, and must be arranged symmetrically upon the armature.
2. Each inductor of a simplex winding must be encountered once only, and the winding must be re-entrant.
3. Each simplex winding composing a multiplex winding must fulfill the requirement for a simplex winding.
4. A singly re-entrant multiplex winding must as a whole satisfy the requirement for a simplex winding.
In addition to the above requirements for lap and wave windings in general, lap windings must comply with the following conditions:
1. The front and back pitches must be opposite in sign;