TEN-FOUR-TWO POLE CHANGING WINDING Russian patent published in 2003 - IPC

FIELD: electrical machines; variable-speed electrical machines including three-speed motors. SUBSTANCE: winding has 18 coil groups numbered 1 through 18 and leads numbered 19 through 27; in first phase (i = 1) finishing lead of coil group 1 is connected to starting lead of group 5, finishing lead of group 5, to finishing lead of group 10, starting lead of group 10, to finishing lead of group 14, finishing lead of group 3, to finishing lead of group 12; in second phase (i = 2) finishing lead of coil group 7 is connected to starting lead of group 11, finishing lead of group 11, to finishing lead of group 16, starting lead of group 16, to finishing lead of group 2, finishing lead of group 9, to finishing lead of group 18; in third phase (i = 3) finishing lead of group 13 is connected to starting lead of group 17, finishing lead of group 17, to finishing lead of group 4, starting lead of group 4, to finishing group of group 8, finishing lead of group 15, to finishing lead of group 6; leads from starting lead of group 2, from starting lead of group 8, from starting lead of group 14, from finishing lead of group 3, from finishing lead of group 9, from finishing lead of group 15, from interconnected starting leads of groups 18 and 13, from interconnected starting leads of groups 6, 7, 9, and from interconnected starting leads of groups 12, 13, 15 multiple of three coil groups are divided into internal half-groups 3*, 6*, 9*, 12*, 15*, 18* and external half-groups 3, 6, 9, 12, 15, 18 having different pitch; external half-groups are wound with large-section wire. Applying voltage across leads 20, 23, 26 gives ten-pole machine with star-data connected phases. With voltage applied across leads 19, 22, 25, with leads 21, 24, 27 being interconnected, motor runs as four-pole machine with star-star connected phases. With voltage applied across leads 21, 24, 27, with leads 20, 23, 26 being interconnected, motor runs as two-pole machine with phases connected in star and delta. EFFECT: enlarged functional capabilities of new variable-speed motors using such winding. 1 cl, 1 dwg