THREE-PHASE, DOUBLE-LAYER, FRACTIONAL-SLOT (q=3.5), 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, 12/6, and 16/8, odd-numbered concentric four-coil groups have coil pitches y_si = 8 - 2(i - 1) at turn number (1 + x)w_c, at turn number(1 - x)w of coil with i = 1, 4 and at turn number (1 + x)w_c of coil with i = 2 and at turn number of coil with i = 1, 4, and at turn number (1 + x)w_c, of coil with i = 2, and even-numbered three-coil groups have coil pitch y_si = 7 - 2(i - 1) at turn number (1 + x)w_c of coil with i = 2 at w_c turns of remaining coil groups, where z = 21 for 2p₁/2p₂ = 4/2, z = 42 for 2p₁/2p₂ = 8/4, z = 63 for 12/6, z = 84 for 2p₁/2p₂ = 16/8; i = 1 ... 4 is coil number in group starting from external one; 2w_c is turn number per slot at x = 0.53.

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

1 cl, 3 dwg