Electric motor rotor including end ring restrainer
AssigneeSchaeffler Technologies AG & Co. KG
InventorsTuo Luo, Wasi Uddin
Life of this patent
Estimating the term…
Abstract
An induction motor rotor includes a magnetic metal core; and an electrically conductive metal contiguous with the magnetic metal core. The electrically conductive metal includes rotor bars extending along the magnetic metal core and end segments formed onto opposite ends of the rotor bars. Each of the end segments includes a base section extending a first axial distance from the magnetic metal core and a protrusion extending a second axial distance from the magnetic metal core. The second axial distance is greater than the first axial distance. The induction motor rotor also includes a metal ring positioned on an outer circumferential surface of each of the end segments to prevent the end segments from separating from the rotor bars.
Claims20
An induction motor rotor comprising:
- a magnetic metal core;
- an electrically conductive metal contiguous with the magnetic metal core, the electrically conductive metal including rotor bars extending along the magnetic metal core and end segments formed onto opposite ends of the rotor bars, each of the end segments including a base section extending a first axial distance from the magnetic metal core and a protrusion extending a second axial distance from the magnetic metal core, the second axial distance being greater than the first axial distance;
- and
- a metal ring positioned on an outer circumferential surface of each of the end segments to prevent the end segments from separating from the rotor bars,
- each of the metal rings being positioned on only a portion of an outer circumferential surface of the base section and only a portion of an outer circumferential surface of the protrusion.
An induction motor comprising:
- a stator;
- and
- a rotor rotatable with respect to the stator, the rotor comprising:
- a magnetic metal core formed by a plurality of circumferentially spaced segments;
- an electrically conductive metal including rotor bars interleaved between the circumferentially spaced segments and end segments formed onto opposite ends of the rotor bars, each of the end segments protruding axially past the magnetic metal core and including a base section extending a first axial distance from the magnetic metal core and a protrusion extending a second axial distance from the magnetic metal core, the second axial distance being greater than the first axial distance;
- and
- a metal ring positioned on an outer circumferential surface of each of the end segments, the metal ring having a greater yield strength than the end segments,
- each of the metal rings being positioned on only a portion of an outer circumferential surface of the base section and only a portion of the outer circumferential surface of the protrusion.
A method of manufacturing an induction motor rotor comprising:
- joining an electrically conductive metal to a magnetic metal core to form rotor bars interleaved between circumferentially spaced segments of the magnetic metal core and end segments formed onto opposite ends of the rotor bars, each of the end segments protruding axially past the magnetic metal core and including a base section extending a first axial distance from the magnetic metal core and a protrusion extending a second axial distance from the magnetic metal core, the second axial distance being greater than the first axial distance;
- and
- fixing a metal ring on an outer circumferential surface of each of the end segments, the metal rings each having a greater yield strength than the end segments,
- each of the metal rings being positioned on only a portion of an outer circumferential surface of the base section and only a portion of an outer circumferential surface of the protrusion.
Dependencies are inferred from the claim text.