Apparatus and method for dissipating heat from a motor

Electrical generator or motor structure – Dynamoelectric – Rotary

Reexamination Certificate

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Details

C310S064000, C310S089000, C029S596000

Reexamination Certificate

active

06201321

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to an apparatus and method for improved dissipation of heat from an electric motor, especially a brushless motor.
SUMMARY OF THE INVENTION
By the present invention, heat is dissipated from an electric motor by heat-conductive masses of material encapsulating end turns of a stator fixed in a housing of the motor. Heat is also dissipated from the stator through one of the heat-conductive masses of material to an element of the housing, such as a front plate, extending across one of the ends of the stator toward a shaft of the motor.
In one embodiment, a resilient heat-conductive pad is interposed between the element of the housing and a side of one of the heat-conductive masses of material facing the element of the housing. The resilient heat-conductive pad has a thickness greater than the manufacturing tolerances associated with assembling an end of the stator at an end of a main portion of the housing adjacent to the element.
In another embodiment, the heat-conductive mass of material adjacent to the element of the housing extends into contact with the element. The contact can be assured, even without the presence of a resilient pad, by forming the heat-conductive mass between the stator and the element of the housing after the stator is assembled to the housing. More specifically, a heat-conductive material in liquid form is made to flow into a space around the end turns and into any gap between the housing elements and the end turns to fill the space and the end turns to fill the space and the gap, after which the liquid material is cured.


REFERENCES:
patent: 3719436 (1973-03-01), McFarlin
patent: 3742595 (1973-07-01), Lykes
patent: 3758799 (1973-09-01), Dochterman et al.
patent: 4128527 (1978-12-01), Kinjo et al.
patent: 4387311 (1983-06-01), Kobayashi et al.
patent: 4624884 (1986-11-01), Harada et al.
patent: 4963776 (1990-10-01), Kitamura
patent: 5459190 (1995-10-01), Nakamura et al.
patent: 5532533 (1996-07-01), Mizutani

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