From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Technical note detailing the principles and formulas for wave winding of uniform slot pitch in armatures.
| Identifier | ExFiles\Box 68\4\ scan0217 | |
| Date | 30th May 1921 guessed | |
| X 1640 X.1640 - ARMATURE WINDINGS. (3) WAVE WINDING OF UNIFORM SLOT PITCH. Number of conductors = n (virtual) " " poles = p Both n and p are even. Winding is preferably retrogressive. So in n - 2 conductors there must be p steps. For uniform slot pitch, if conductor pitch is z, for coil or back end connection, it must be z - 2 for front or commutator end connection. Thus the conductor steps are alternately z and z-2, starting with z, and both are necessarily odd. Number of conductors passed and traversed in p steps = n - 2 = p/2 (z + z-2) = p (z - 1) Hence n = p (z - 1) + 2 Number of slots = n/2 = p(z - 1)/2 + 1 Since z - 1 is even, number of slots = p m + 1 where m is an integer. Thus for a four pole machine number of slots = 4 m + 1. EFC. | ||