SINGLE-PHASE POLE-CHANGING MOTOR WINDING Russian patent published in 1997 - IPC

FIELD: electrical engineering. SUBSTANCE: split-phase, single-layer winding with pole pair ratio P₁:P₂= 1:2 and P₃> P₂ is built up of two parts with diametral pitch according to pole pair P₂; each part has 2q coils and each phase, 1/a circuits, where q = 3a, 5a, 7a, ...; a = 1,2,3, ...; both circuits are series-connected with three taps; pole pair P₂ is formed by cumulative connection of coils of first and second winding parts, pole pair P₁, by differential connection, and pole pair P₃ is determined by expression P₃= P₁q/a, where first phase is formed by odd-numbered circuits of winding and second phase, by even-numbered ones; next circuit is differentially connected to preceding one. EFFECT: facilitated manufacture and reduced active material input. 5 cl, 6 dwg