System and method for stator construction of an electric motor
First Claim
1. A method to reduce core loss in an electric motor by preparing laminates of at least one of the stator and rotor such that, upon assembly into a stator and rotor of an electric motor and operated within expected parameters, core loss is reduced, comprising:
- forming at least one of a stator and a rotor laminate;
subjecting the at least one stator and rotor laminate to a reduced temperature bath; and
assembling a plurality of the stator and rotor laminates into a stator and rotor of an electric motor, respectively, such that upon operation, the electric motor exhibits reduced core loss,wherein the at least one stator and rotor laminate is subjected to the reduced temperature by submersion of the laminate into a cold bath,wherein the at least one stator and rotor laminate remains submersed in the cold bath for a period of up to 8 hours and is then removed in a reverse process until completely free of the cold bath, andwherein the at least one stator and rotor laminate is held free of the cold bath and allowed to substantially reach room temperature before assembly.
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Accused Products
Abstract
A system and method to reduce core loss in the stator of an electric motor by first preparing laminations of the stator and/or rotor in a water jetting operation, punching or stamping operation, laser cutting operation, or similar manufacturing operation, and then subjecting the laminations to a temperature treatment in a manner such that, upon assembly into a stator and/or rotor of an electric motor and operated within expected parameters, core loss is reduced. The system and method subjects the laminations to a cold bath preferably consisting of liquid nitrogen, after stamping but preferably prior to assembly, and then stacking the laminations together for assembly as a stator and/or rotor of an electric motor.
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Citations
17 Claims
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1. A method to reduce core loss in an electric motor by preparing laminates of at least one of the stator and rotor such that, upon assembly into a stator and rotor of an electric motor and operated within expected parameters, core loss is reduced, comprising:
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forming at least one of a stator and a rotor laminate; subjecting the at least one stator and rotor laminate to a reduced temperature bath; and assembling a plurality of the stator and rotor laminates into a stator and rotor of an electric motor, respectively, such that upon operation, the electric motor exhibits reduced core loss, wherein the at least one stator and rotor laminate is subjected to the reduced temperature by submersion of the laminate into a cold bath, wherein the at least one stator and rotor laminate remains submersed in the cold bath for a period of up to 8 hours and is then removed in a reverse process until completely free of the cold bath, and wherein the at least one stator and rotor laminate is held free of the cold bath and allowed to substantially reach room temperature before assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to reduce core loss in laminates of an electric motor, comprising:
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forming at least one of a stator or a rotor laminate; subjecting the laminate at a room temperature of between 293 K and 298 K (68 F and 77 F), to a reduced temperature bath maintained between 63 K and 77.2 K (−
346 F and −
320 F) at normal atmospheric pressure; andassembling a plurality of laminates into an electric motor such that upon operation, the electric motor exhibits reduced core loss. - View Dependent Claims (11, 12, 13)
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14. A method to reduce core loss in laminates of an electric motor, comprising:
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subjecting at least one of a stator or a rotor laminate at a room temperature of between 293 K and 298 K (68 F and 77 F), to a reduced temperature bath maintained between 63 K and 77.2 K (−
346 F and −
320 F) at normal atmospheric pressure; andassembling a plurality of laminates at a room temperature of between 293 K and 298 K (68 F and 77 F) into an electric motor such that upon operation, the electric motor exhibits reduced core loss. - View Dependent Claims (15, 16, 17)
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Specification