High speed induction motor rotor and method of fabrication
AssigneeGeneral Electric Company
InventorsGerald Burt Kliman, Raymond Alan White, Wen Liang Soong, Roger Neal Johnson, Joseph Eugene Miller, John Raymond Hughes
Life of this patent
Estimating the term…
Abstract
An induction motor rotor comprises a rotor shaft, a rotor core, which may be solid or may include a plurality of rotor laminations, having rotor bar slots, a plurality of rotor bars extending through the rotor bar slots, and two rotor end rings brazed to the rotor bars and extending to the rotor shaft, the rotor bars and rotor end rings pre-stressing the rotor core.
Claims32
An induction motor rotor comprising:
- a rotor shaft;
- a plurality of rotor laminations having rotor bar slots;
- a plurality of rotor bars extending through the rotor bar slots;
- two rotor end rings brazed to the rotor bars, the rotor bars and rotor end rings pre-stressing the rotor laminations to prevent loosening of the rotor laminations during rotation of the rotor.
A method for fabricating an induction motor rotor lamination, the method comprising:
- patterning a sheet of silicon steel to form a rotor lamination having rotor bar slots;
- and
- annealing the rotor lamination at a temperature ranging from about 675° C. to about 732° C. for a time period ranging from about 4 minutes to about 10 minutes.
A method for fabricating an induction motor rotor, the method comprising:
- inserting rotor bars into a rotor core;
- brazing two rotor end rings to the rotor bars while maintaining a temperature sufficient for brazing for a time period sufficient to complete brazing without significantly reducing the strength of the rotor core;
- permitting the rotor end rings, the rotor core, and the rotor bars to cool so that the rotor bars and rotor end rings pre-stress the rotor core.
A method for fabricating an induction motor rotor, the method comprising:
- inserting rotor bars into a rotor core comprising a plurality of partially annealed silicon steel rotor laminations;
- simultaneously annealing the rotor laminations and brazing two rotor end rings to the rotor bars;
- permitting the rotor end rings, the rotor core, and the rotor bars to cool so that the rotor bars and rotor end rings pre-stress the rotor core.
An induction motor rotor comprising:
- a rotor shaft;
- a solid rotor core having rotor grooves and rotor bar slots;
- a plurality of rotor bars extending through the rotor bar slots;
- two rotor end rings brazed to the rotor bars, the rotor bars and rotor end rings pre-stressing the rotor core to prevent loosening of the rotor bars during rotation of the rotor.
A method for fabricating a rotor core, the method comprising:
- providing rotor laminations, each rotor lamination having a rotor bar slots;
- stacking the rotor laminations with at least one of the rotor bar slots of each rotor lamination being aligned by at least one alignment pin comprising a material sufficiently hard to prevent the alignment pin from damaging the rotor lamination;
- removing the at least one alignment pin;
- inserting rotor bars into the rotor bar slots with each rotor bar being inserted into a respective one of the rotor bar slots.
Dependencies are inferred from the claim text.