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A high speed induction motor comprising a stator and a rotor coaxially positioned within the stator, and mounted in a suitable frame having a water cooled jacket. The stator includes a multiphase winding 16 on a laminated core 18, and having stainless steel end plates 24. Cooling coils 30 are around

A high speed induction motor comprising a stator and a rotor coaxially positioned within the stator, and mounted in a suitable frame having a water cooled jacket. The stator includes a multiphase winding 16 on a laminated core 18, and having stainless steel end plates 24. Cooling coils 30 are around the end turn portions of the windings, and layers of insulation 28 are between the windings and the cooling coils. The rotor 12 has a core section 37 and an integral shaft 38. A plurality of elongated conductor bars 40 fit tightly into semiclosed elongated slots 42 in the rotor core 37, the slots and bars preferably having a wedge shaped cross section, and having a narrow neck portion adjacent the outer periphery of the rotor core, forming rotor teeth 54 between adjacent conductor bars. Copper end rings 68 are provided at opposite ends of the rotor core, with reduced opposite end portions 76 of the conductor bars received and brazed within spaced slots 70 around the periphery of the end rings. The copper end rings are spaced from the ends of the rotor core by non-magnetic spacers 78 and retained by titanium end caps.

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In an induction motor comprising a stator including a laminated iron core, and a multiphase winding on said core; and a rotor including a one piece rotor core and shaft coaxially mounted within the stator; the improvement wherein said rotor comprises a plurality of elongated slots in the periphery o

In an induction motor comprising a stator including a laminated iron core, and a multiphase winding on said core; and a rotor including a one piece rotor core and shaft coaxially mounted within the stator; the improvement wherein said rotor comprises a plurality of elongated slots in the periphery of the rotor core, said slots having a reduced outer radial end portion adjacent to the core periphery and partially enclosing said slots, a plurality of elongated conductor bars received in said slots and having reduced outer radial end portions received in the reduced outer radial end portions of said slots, and providing outer radial restraint of said conductor bars in the rotor core, said conductor bars having end portions extending outwardly beyond the ends of said rotor core, conductor end rings at opposite axial ends of the rotor core, said end rings having a plurality of slots in the periphery thereof, said end portions of said conductor bars received in said last mentioned slots, and non-magnetic metal spacers mounted between the ends of the rotor core and the conductor end rings for reducing the self-induced magnetic field around the end rings thereby reducing the electrical reactance of the end rings.