Totally enclosed air cooled electrical machines
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United States of America Patent
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-
Sep 7, 1982
Grant Date -
N/A
app pub date -
Jun 13, 1980
filing date -
Jun 13, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A totally enclosed electrical machine, particularly a high power electric motor, is provided with a plate-type, crossflow, air-to-air heat exchanger which is seated on the frame of the electrical machine. Adjacent plates of the heat exchanger are modular units which define an array of ducts through which the internal air heated by the machine flows in a direction away from the machine. The ducts at opposite ends of the array provide passages for the bi-directional flow of air, such that air which is cooled in the heat exchanger is returned to the opposite ends of the machine. The heat exchanger is provided with a plenum in which air is returned to the end ducts. A baffle in the plenum distributes the air in different amounts, which vary progressively but in opposite senses, to the return ducts which communicate with the opposite ends of the machine thereby equalizing the temperature of the return air supplied to the opposite ends of the machine and providing uniform cooling of the machine. External air is directed through channels between adjacent plates of the heat exchanger, the opposite sides of which define the ducts for the internal machine air. The entire unit can readily be assembled at low cost.
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