THREE-PHASE WINDING WITH POLE SWITCHING Russian patent published in 1994 - IPC

FIELD: electric machine engineering. SUBSTANCE: invention relates to three-phase two-speed asynchronous motors. Three-phase winding with pole switching with relation of number of poles P₁:P₂= 1:2 is connected by star circuit and consists of identical number of poles. Coils are integrated into coil groups. Number of coils per phase zone is integer. Each phase includes four parts. With greater number of poles parts are connected in series. First two parts are connected in aiding, two others - in opposition to first two. With lesser number of pairs of poles two first parts and two second parts of each phase are connected in parallel and in opposition. Integrated first parts of each phase are connected in series with integrated second parts of each adjacent phase. EFFECT: improved operational characteristics. 4 dwg, 2 tbl