Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-12-12
1997-05-27
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 65, H02K 900
Patent
active
056335431
ABSTRACT:
In a ventilated cooling system for a generator, the cooling ducts in the stator are arranged to control the flow of cooling gases through the stator. The ducts in the stator extend radially and direct cooling gases from the outer periphery of the stator to its inner cylindrical surface. Cooling gases flow radially inward through these stator ducts, extract heat out of the stator and exit from the stator ducts into an annular air gap between the stator and rotor. A fan on the rotor draws the heated air out from the air gap and causes more cooling gas to be drawn into the stator. The cooling ducts in the stator are spaced and sized to optimally distribute the flow of cooling gases through the stator by equalizing the pressure drops between the stator outer plenum and the entrance to the rotor exhaust fans. For example, the stator ducts may be spaced close together at the center of the stator and farther apart near the ends of the stator to provide balanced cooling flows and uniform temperatures. Similarly, the cross-sectional area of the cooling ducts at the center of the stator may be greater than that of the ducts near the ends of the stator. By arranging the spacing and area of the stator ducts along the length of the stator, the volume of cooling gases and the required pressure head are reduced and minimized. In addition, the volume of cooling gases may be directed to those sections of the stator that most require cooling.
REFERENCES:
patent: 831625 (1906-09-01), McElroy
patent: 926086 (1909-06-01), Behrend
patent: 3508093 (1970-04-01), Obukhov
patent: 4876470 (1989-10-01), Geller
Boardman, IV William H.
Jarczynski Emil D.
Nold Rebecca A.
Budd Mark O.
General Electric Co.
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