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US 9,866,092 B2Granted
Rotor and method of forming same
AssigneeGM Global Technology Operations LLC
InventorsMichael D. Hanna, James G. Schroth, John S. Agapiou, John C. Morgante
Life of this patent
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Abstract
A method of forming a rotor includes inserting a conductor bar into a slot defined by a lamination stack to define a gap between the conductor bar and the lamination stack. The method further includes, after inserting, swelling the conductor bar within the slot to fill the gap and form the rotor. A rotor is also disclosed.
Claims12
A method of forming a rotor, the method comprising:
- inserting a conductor bar into a slot defined by a lamination stack to define a gap between the conductor bar and the lamination stack;
- after inserting, expanding the conductor bar within the slot to fill the gap and form the rotor;
- and
- diffusing hydrogen gas into the conductor bar;
- wherein diffusing includes heating the conductor bar at a temperature of from about 100° C. to about 800° C. for a duration of from about 1 hour to about 20 days in an atmosphere including hydrogen in an amount of from about 2 parts by volume to about 100 parts by volume based on 100 parts by volume of the atmosphere.
2 more elements
A method of forming a rotor, the method comprising:
- stacking a plurality of steel laminations adjacent and in contact with one another to form a lamination stack, wherein the lamination stack has a proximal surface and a distal surface spaced apart from the proximal surface and further wherein the lamination stack defines a slot therethrough extending from the proximal surface to the distal surface;
- diffusing hydrogen gas into the conductor bar;
- wherein diffusing includes exposing the conductor bar to an atmosphere including hydrogen in an amount of from about 2 parts by volume to about 20 parts by volume based on 100 parts by volume of the atmosphere;
- after diffusing, inserting a conductor bar having an end portion into the slot to define a gap between the conductor bar and the lamination stack;
- after inserting, applying a flux material to the end portion;
- after applying, pre-heating the flux material;
- and
- after inserting, expanding the conductor bar within the slot to fill the gap and form the rotor.
5 more elements
A method of forming a rotor, the method comprising:
- stacking a plurality of steel laminations adjacent and in contact with one another to form a lamination stack, wherein the lamination stack has a proximal surface and a distal surface spaced apart from the proximal surface and further wherein the lamination stack defines a slot therethrough extending from the proximal surface to the distal surface;
- diffusing hydrogen gas into the conductor bar;
- after diffusing, inserting a conductor bar having an end portion into the slot to define a gap between the conductor bar and the lamination stack;
- after inserting, applying a flux material to the end portion;
- after applying, pre-heating the flux material;
- and
- after inserting, expanding the conductor bar within the slot to fill the gap and form the rotor;
- wherein expanding includes heating the conductor bar at a temperature of from about 100° C. to about 800° C. for a duration of from about 1 hour to about 20 days in an atmosphere including hydrogen in an amount of from about 2 parts by volume to about 100 parts by volume based on 100 parts by volume of the atmosphere.
5 more elements
Dependencies are inferred from the claim text.