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

FIELD: electrical engineering; dual-speed motors. SUBSTANCE: winding with pole number 2p = 4 has eighteen coil groups with number of coils alternating within each group as follows: 3, 3, 2, 1, 1, 2, 3, 2, 1, 1, 2, 3, 3, 2, 1, 1, 2; coil group starting lead 1 is connected to its finishing lead 5, starting lead 6, to starting lead 9, finishing lead 10, to finishing lead 14, finishing lead 7, to finishing lead 11, starting lead 12, to starting lead 15, finishing lead 16, to finishing lead 2, finishing lead 13, to finishing lead 17, starting lead 18, to starting lead 2, finishing lead 4, to finishing lead 8; starting leads 13, 14, and finishing lead 18 of coil groups are combined and form terminal lead 19; starting leads 5, 11, and 17 are combined and form terminal lead 20; starting leads 1, 10, and finishing lead 6 are combined and form terminal lead 21; starting leads 2, 8, and 14 are combined and form terminal lead 22; finishing leads 3, 9, and 15 are combined and form terminal lead 23; starting leads 7, 16, and finishing lead 12 are combined and form terminal lead 24. Motor runs as four-pole machine when voltage is applied to leads 19, 21, 24 and as six-pole machine when it is applied to leads 20, 22, 23. EFFECT: reduced unbalance of internal-voltage vectors in parallel circuits of winding. 5 dwg