THREE-PHASE, DOUBLE-LAYER, FRACTIONAL-SLOT (q=2.5), 2p/2p=2/1 POLE-CHANGING WINDING Russian patent published in 2005 - IPC

FIELD: electrical engineering.

SUBSTANCE: proposed fractional-slot (q = 2.5) 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 = 8/4, 12/6, and 16/8, odd-numbered concentric three-coil groups have coil pitches y_si = 6, 4, 2 at turn number (1 - x)w_c, (1 + x)w_c (1 - x)w_c, and even-numbered double-coil groups have coil pitch y_si = 5, 3 at turn number w_c, (1 + x)w_c, where z = 30 for 2p₁/2p₂ = 8/4, z = 45 for 2p₁/2p₂ = 12/6, z = 60 for 2p₁/2p₂ = 16/8; 2w_c is turn number per slot at x = 0.54.

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

1 cl, 3 dwg