Reduction of leakage flux in electrical machines

摘要

An electrical machine (100) includes an armature (102) defining a winding slot (104; 404; 604) that houses a winding (106; 406; 606). A slot opening (108; 608) connects into the winding slot (104; 404; 604). A flux repeller (110; 210; 310; 410; 510; 610) is disposed in the slot opening (104; 404; 604) to reduce slot leakage flux. In certain embodiments the armature (102) is a stationary armature (102) defining a plurality of winding slots (104; 404; 604), each winding slot (104; 404; 604) housing a winding (106; 406; 606). A rotor (112; 612) is disposed radially apart from the stationary armature (102) with a radial gap (114; 614) defined between the armature (102) and rotor core (112; 612). Each winding slot (104; 404; 604) has a slot opening (108; 608) that connects the winding slot (104; 404; 604) to the gap (114; 614). A plurality of flux repellers (110; 210; 310; 410; 510; 610) is included as described above, with a respective one of the flux repellers (110; 210; 310; 410; 510; 610) disposed in each respective slot (104; 404; 604) opening to reduce slot leakage flux.