SIX TO FOUR POLE CHANGING WINDING Russian patent published in 2000 - IPC

FIELD: variable-speed motors. SUBSTANCE: winding has twenty one coil groups with coil numbers alternating in coil groups as follows: 1, 5, 6, 5, 1, 3, 3, 1, 5, 6, 5, 1, 3, 3, 1, 5, 6, 5, 1, 3, 3; finishing lead 2 of coil group is connected to its finishing lead 6, starting lead 3 to starting lead 8, finishing lead 3 to finishing lead 19, starting lead 21 to starting lead 4, finishing lead 5 to finishing lead 10, starting lead 10 to starting lead 15, starting lead 7 to starting lead 11, finishing lead 9 to finishing lead 13, finishing lead 12 to finishing lead 17, starting lead 17 to starting lead 1, starting lead 14 to starting lead 18, finishing lead 16 to finishing lead 20; combined starting leads 16, 5 and finishing lead 21 of coil groups form lead 22; combined starting leads 6, 13, 20 of coil groups form lead 23; combined starting leads 2,12 and finishing lead 7 of coil groups form lead 24; combined finishing leads 1, 8, 15 of coil groups form lead 25; combined finishing leads 4, 11, 18 of coil groups form lead 26; combined starting leads 9,19 and finishing lead 14 of coil groups form lead 27. With voltage applied to leads 22, 24, 27 we shall have four poles and to leads 22, 26, 27, six poles. EFFECT: reduced unbalance of internal-voltage vectors in parallel circuits. 1 dwg