THREE-PHASE, DOUBLE-LAYER, FRACTIONAL-SLOT (q=4.5), 2p/2p=2/1 POLE-CHANGING WINDING Russian patent published in 2005 - IPC

FIELD: electrical engineering.

SUBSTANCE: proposed double-layer pole-changing winding whose phase leads are connected in Y/YY or Δ/YY has N_cg = 6p₂ coil groups placed in z = 6p₂q slots with slot pitch y_s = z/2p₁, each phase being divided into two parts with odd-numbered groups in one part, even-numbered ones, in other part, and additional leads, brought out of midpoints in each phase. With 2p₁/2p₂ = 4/2, 8/4, and 12/6, odd-numbered concentric five-coil groups have coil pitches y_si = 11 - 2(i - 1) at turn number (1 - x)w_c of coil with i = 1, 5 and at turn number(1 + x)w_c of coil with i = 3, and even-numbered four-coil groups have coil pitch y'_si = 10 - 2(i - 1) with turn number (1 + x)w_c of coil with i = 3 at w_c turns of remaining coil groups, where z = 27 for 2p₁/2p₂ = 4/2, z = 54 for 2p₁/2p₂ = 8/4, z = 81 for 2p₁/2p₂ = 12/6; i = 1... 5 is coil number in group starting from external one; 2w_c is turn number per slot at x = 0.52.

EFFECT: equalized internal voltages and resistances among large and small coil groups of proposed winding.

1 cl, 3 dwg