GB1441161A - Change speed rotary dynamo-electric machine - Google Patents

Abstract

1441161 Dynamo-electric machines COMPAGNIE ELECTRO-MECANIQUE 26 June 1973 [27 June 1972] 30336/73 Heading H2A A change speed rotary dynamo-electric machine includes a three phase winding comprising at least nine groups of coils, A1....C3, Fig. 1, the coils in each group, e.g. 1, 2, 3, 10 in Al, being connected in series, the groups of coils being brought out to terminals, e.g. U 1 , X 1 for Al, whereby the interconnection of the groups may be changed to change the winding pole number, and the grouping of the coils is arranged to enable the selection of a plurality of group interconnections providing different winding pole numbers and different machine speeds in each case with a balanced three phase winding. The interconnection of the groups of coils shown in Fig. 1 provides a four pole winding. Figs. 2, 3 and 4 (all not shown) illustrate different interconnections of the groups A1 .... C3 providing respectively six pole, two pole and fourteen pole windings. In a modification, Fig. 15 (not shown) the same thirty six coils are arranged in twelve groups all brought out to terminals which are interconnected to form four parallel delta networks giving a four pole winding. A six pole winding is obtained by changing the interconnections of the groups to form a complex delta network, Fig. 16 (not shown), three of the groups being omitted. Fig. 23 (not shown) illustrates another 36 coil winding for a two speed machine, the coils being arranged in nine groups which are interconnected to form three parallel star networks for both machine speeds. Fig. 19 (not shown) illustrates another 36 coil windings arranged in twelve groups which are interconnected as four parallel stars for one speed and three parallel stars for another speed, three of the groups being ineffective in the latter interconnection. In yet another winding having 36 rails arranged in twelve groups A1 ....C4, Fig. 17, terminals. R<SP>1</SP>,S<SP>1</SP>,T<SP>1</SP> are energised to provide a six pole winding and terminals R,S,T are energised to provide a four pole winding, groups A4, B4 and C4 being isolated in the latter interconnection.