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Drip-proof type electrical rotating machine
| Details |
Inventors: Shimamoto, Koji; Shimizu, Mitsuo; Yamashita, Takao;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Skudy; R.
Assistant Examiner:
Attorney, Agent or Firm: Craig & Antonelli
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. |
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DETAILED DESCRIPTION An object of the invention is to provide a electrical rotary machine with improved cooling effect and which is provided with a unique air passing hole of an air guide.
Another object of the invention is to provide an electrical rotary machine manufactured at a low cost.
According to the present invention, an air guide is constructed such that the distance from the axis of a rotating shaft of the machine to the edge of the air passing hole portion above the rotating shaft is selected to be shorter than that from the axis to the edge of the air passing hole portion under the shaft.
This configuration of the air guide can be realized in such a way that the air passing hole is shaped circular and the center of the circular hole is eccentrically located below the axis of the rotating shaft.
This configuration may also be realized when the radius of the air passing hole above the rotating shaft is so selected as to be shorter than that below the rotating shaft.
With such an air passing hole, since the area of the air passing hole under the shaft is larger, a sufficient amount of air may be supplied therethrough to the space including the stator coil.
Accordingly, the lower part of the stator coil is sufficiently cooled.
Most of the air flowing into the space including the stator coil in the frame is exhausted from the outlet, with little flow thereof along the inner surface of the housing.
Therefore, the outstanding counter-flow is almost eliminated.
Further, the area of the air passing hole above the shaft is made smaller than the conventional one, so that the counter-flow passing therethrough is much reduced.
Accordingly, the turbulent flow produced in the vicinity of an inlet of the air passing hole is also reduced so that the amount of the air flow toward the stator coil through the air passing hole is increased, thus resulting in good cooling of the stator coil.
An experiment was conducted to check the effects of the invention.
In the electrical rotary machine used in the experiment, the diameter d
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