Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1997-05-15
2001-01-30
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S049540, C310S064000, C310S254100
Reexamination Certificate
active
06181038
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an electric motor or generator, such as an alternator, having a stator impregnated with a thermally conductive epoxy resin.
BACKGROUND OF THE INVENTION
Electric motors or generators having a stator secured within the housing of the rotor or generator are well known. A rotor coil mounted on a shaft is positioned within the stator and is rotatable relative to the stator about the longitudinal axis of the shaft. Liquid cooling can be provided for the motor or generator by passing fluid, such as water, through passages formed in the housing order to provide cooling for the stator. In order to enhance the cooling of the stator, the stator can be impregnated with a thermally conductive epoxy resin which promotes the thermal conductivity between the stator and the cooling fluid. EP-A-0327338 describes such a known arrangement. Because of the tight fitting of the stator in the housing, it can be difficult to impregnate the stator without leaving air pockets in the epoxy resin.
SUMMARY OF THE INVENTION
An electric motor or generator in accordance with the present invention comprises a housing having a substantially annular inner surface; a stator having an annular outer surface fixedly secured within the housing against the annular inner surface; a shaft having a longitudinal axis, extending into the housing, and rotatable about the longitudinal axis relative to the housing and the stator; a rotor coil mounted on the shaft and positioned within the stator; and a thermally conductive epoxy resin impregnating the stator; wherein the housing and the annular outer surface of the stator have a number of longitudinally extending slots formed therein within which the epoxy resin is also positioned.
The slots allow easier passage of the epoxy resin around the stator during the impregnating process. This reduces the time taken to insert the epoxy resin and improves the quality by reducing the risk of air pockets being left in the (epoxy resin.
REFERENCES:
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patent: 61-052136 (1986-03-01), None
patent: 61-147744 (1986-07-01), None
patent: 61-147744A (1986-07-01), None
patent: WO88/06371 (1988-08-01), None
patent: WO89/11176 (1989-11-01), None
Dobrowitsky Margaret A.
General Motors Corporation
Perez Guillermo
Ramirez Nestor
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