AN ALTERNATIVE PATTERN FOR FOUR-POLE THREE-PHASE INDUCTION MOTOR WINDINGS

Abstract- The three-phase a.c. windings are approached in the paper taking into account the supplementary degree of freedom given by non-uniform distribution of the coils placed in the non-equal cross section slots. A functional criterion is defined starting from the space harmonic contents of the air gap mmf expressed by the number of turns of the stator concentric coils and the angular openings of the respective coils. Some constraints related to the technological limitation of minimum tooth width and yoke height are considered. One example of the single layer, integer winding with 24 slots, four poles motor is discussed