SPLIT-PHASE TWO/FOUR/SIX/TEN POLE CHANGING WINDING Russian patent published in 2002 - IPC

FIELD: electrical engineering; single-phase variable-speed motors. SUBSTANCE: proposed winding provides for developing four-pole motors with 24, 36, and 48 stator slots. Winding is built up of two parts each having 2q coils, diameter pitch being for pole pair number P₂ = 2 and pole pair ratio P₁:P₂ = 1:2 and P₃>P₂. Novelty is that all coils are assembled in six concentric coil groups, coil number per group being dependent on numerical series 1K, 1K, 1K, 1K, 1K, 1K, where K is positive integer number K = Z₁/12, and Z₁ is number of stator slots; starting and finishing leads of coil groups are brought out; at P₁ = 1 parallel-interconnected coil groups numbered 1, 4, 5 according to above-given series are connected in parallel with parallelinterconnected coil groups 2, 3, 6 through capacitor; at P₂ = 2 coil groups 2, 3, 6 are interconnected in parallel, coil groups 1, 4, 5 are interconnected in parallel and series-connected to coil groups 2, 3, 6; capacitor is connected in parallel with coil groups 1, 4, 5; at P₄ = 5 coil groups 1, 5, 3 are interconnected in series, coil groups 6, 4, 2 are interconnected in series and connected in parallel with coil groups 1, 5, 3; capacitor is connected in parallel with coil group 4; at P₃ = 3 coil groups 1, 3, 4 are interconnected in series, coil groups 2, 6, 3 are interconnected in series and parallel-connected to coil groups 1, 3, 4; capacitor is parallel-connected to coil groups 2, 6. EFFECT: enhanced speed control range, reduced number of leads being changed over thereby facilitating pole changing process. 9 dwg