FIELD: electrical and electromechanical engineering; induction and synchronous machines including induction motors.
SUBSTANCE: proposed asymmetric double-layer fractional-slot lap winding, m = 3-phase, m' = m - 3-band, 2p = 6c, and z = 24c slots, slot number per pole per phase q = z/3p has 3pc coil groups with coil grouping 3 2 3 3 3 3 3 3 2 repeated c times. Novelty is that concentric coils have slot pitches ysi = 6, 4, 2 and slot numbers (1 - x)wc, (1 + x)wc, and (1 - x)wc, respectively, for three-coil groups, as well as slot pitches y'si =5, 3 and turn numbers wc, (1 - x)wc, respectively, for two-coil groups at x = 0.5, where c = 1, 2, 3 ...; 2wx is turn number in slots completely filled with winding.
EFFECT: reduced asymmetry and differential scatter ratios.
1 cl
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RU2293419C2 |
