DOUBLE-LAYER THREE-PHASE POLE-CHANGING WINDING Russian patent published in 1994 - IPC

FIELD: manufacture of double-speed electrical machines. SUBSTANCE: winding is built up of several identical coils and several identical sections comprising 69 coil groups. Number of coils in each coil group, starting from first one, is three times repeated to form the following row: 4C, 4C,2C,2C, C, C, 4C,C,C,C,C,2C,4C,4C,4C,C,3C,2C,C,C,C,C. Adjacent coil groups 2 and 3,4 and 5,5 and 6,6 and 7,8 and 9,9 and 10,11 and 12,12 and 13,17 and 18, 19 and 20, 20 and 21, 22 and 23, 23 and 24, 25 and 26, 27 and 28, 28 and 29, 29 and 30,31 and 32,32 and 33,34 and 35,35 and 36,40 and 41,42 and 43,43 and 44,45 and 46,46 and 47,48 and 49,50 and 51,51 and 52,52 and 53,54 and 55,55 and 56,57 and 58,58 and 59,63 and 64,65 and 66, 66 and 67,68 and 69,69 and 1 are cumulatively connected; remaining adjacent coil groups are connected differentially. Like-polarity circuits of all winding sections may be interconnected in series to form 12 circuits. Three winding leads for pole pair 2p1

multiple of 10 are formed by three joined together finishing leads of circuits 4,7,10, those of circuits 5,8,11, and leads of circuits 6,9,12. For pole pairs 2p2 multiple of 12, winding leads are formed by starting leads of circuits 1, 2, and 3. EFFECT: improved design. 8 dwg