MULTIPHASE DOUBLE-LAYER LOOP WINDING Russian patent published in 2004 - IPC

FIELD: electrical engineering; multiphase squirrel-cage induction motors.

SUBSTANCE: proposed 2p = 4-pole, m = 9-phase loop winding distinguished by improved mmf content and reduced differential dissipation factor σ_d and placed in z = 54 slots at fractional number of slots per pole per phase q = z/2m + b + 0.5 has 2pm alternating (b + 1) and b coil groups with concentric coils at m = 9 phases, m' = 2m = 18 phase belts, q = 1.5 and b = 1; winding has 36 coil groups numbered 1G through 36G at slot pitch y_m = 12, 10, and turn number w_k, (1 - x)w_k for odd-numbered groups, y'_m = 11c (1 + x)w_k turns for even-numbered groups. Groups 1G, -10G, 19G, and -28G are series-connected in first phase and group numbers of each next phase are alternating at interval of two _{groups relative to first-phase groups, where 2wk is number of turns in each slot, x = 0.30, and minus sign means cumulative connection in phase for each group number.}

EFFECT: improved harmonic mmf content and reduced differential dissipation factor.

1 cl, 2 dwg