Drip-proof type electrical rotating machine

Electrical generator or motor structure – Dynamoelectric – Rotary

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310 63, H02K 902

Patent

active

042753210

ABSTRACT:
Drip-proof type electrical rotating machine having inlets and outlets for air flow formed below a rotating shaft supported by a frame. The inlets are formed on end brackets located at both sides of a stator core, and cooling fans rotating together with the rotating shaft are provided on a rotor in opposite to both of the end brackets. Air guides are provided between the inlet and the cooling fans, each air guide being provided with an air passing hole. When the air guide is assembled into the frame, the distance from the axis of the rotating shaft to an above edge of the air passing hole is shorter than the distance from the shaft axis to an lower edge of the air passing hole. With such a construction, the upper edge portion of each air passing hole above the rotating shaft substantially prevents air taken-in from backwardly flowing out therethrough, and the lower edge portion under the shaft permits an effective air suction therethrough from the inlet, thus resulting in improvement of cooling effect of the rotating machine.

REFERENCES:
patent: 1428889 (1922-09-01), Johnson
patent: 1921140 (1933-08-01), Smith
patent: 2347517 (1944-04-01), Smalley
patent: 2488409 (1949-11-01), Hubscher
patent: 3749953 (1973-07-01), Baumann
patent: 3761748 (1973-09-01), Baumann

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