CPC H02K 17/20 (2013.01) [H02K 17/42 (2013.01); H02K 2213/03 (2013.01)] | 19 Claims |
1. An electric induction machine, comprising:
a housing having an inner space;
a stator assembly arranged annularly within the inner space of the housing;
a shaft rotatably supported so as to concentrically extend through the stator assembly; and
a rotor assembly fixed to and surrounding the shaft within the inner space, the rotor assembly being disposed concentrically with and inside the stator assembly, wherein the rotor assembly further comprises:
a cylindrical rotor frame;
a plurality of axially extending longitudinal rotor grooves spaced circumferentially along the rotor frame, each rotor groove being rectangular in shape;
a plurality of longitudinal rotor bars accommodated within the rotor grooves, each rotor bar comprising a rectangular shape corresponding to the rectangular shape of a corresponding rotor groove except for a chamfer region;
a plurality of slits, each slit extending radially outward from a radial outer side of each respective rotor groove to an outer circumference of the rotor frame; and
the chamfer region formed in only each respective rotor bar as a gap between each respective rotor groove and rotor bar pair at a position corresponding to a radially outer internal corner region of the rotor groove,
wherein the gap of the chamfer region does not extend in the tangential direction of the rotor frame beyond a tangentially closest side of the slit.
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