Traction motor

A rotor for an induction motor comprising:

• a punching assembly;
• a plurality of conductive bars substantially parallel to an axis of the rotor and connected to the punching assembly at a periphery of the punching assembly, each conductive bar having an end;
• and
• an end-ring connected to the end of each conductive bar of the plurality of conductive bars, the end-ring comprising copper and having a cross-section comprising:
• a punching surface facing the punching assembly;
• a housing surface opposite the punching surface;
• an outer surface adjoining the punching surface and the housing surface;
• and
• an inner surface opposite the outer surface, the inner surface including a first face adjoining the housing surface and substantially parallel to the outer surface, a second face adjoining the punching surface and substantially parallel to the outer surface, and a distance from the outer surface to the second face being between 1.1 and 1.3 times greater than a distance from the outer surface to the first face.

A traction motor including a rotor, the rotor comprising:

• a punching assembly;
• a plurality of conductive bars substantially parallel to the axis of the rotor and connected to the punching assembly at a periphery of the punching assembly, each conductive bar having an end;
• and
• an end-ring connected to the end of each conductive bar of the plurality of conductive bars, the end-ring including a cross-section comprising:
• a punching surface, a housing surface opposite the punching surface, an outer surface adjoining the punching surface and the housing surface, an inner surface opposite the punching surface, and a centroid that is closer to the punching surface than to the housing surface.