JPH0564388A - Frame of rotary electric machine - Google Patents

Abstract

PURPOSE:To improve heat release effect of the whole and to improve temperature rise of a rotary electric machine by bypassing and flowing cooling wind through a zone of a cooling fin with a punchthrough hole into a zone where cooling wind is shielded by a terminal box and the lug of a bearing bracket. CONSTITUTION:Cooling wind shielded by a terminal box and the lug of a bearing bracket is allowed to bypass and flow by designing cooling fins installed outside a stator frame. A rotary electric machine with a decrease in temperature rise is provided by improving the thermal conductivity, that is heat release effect, of the whole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine, which is a fully-closed fan-type rotating electric machine and has cooling fins on the outer peripheral surface of a stator frame made of steel plate.

[0002]

2. Description of the Related Art A conventional fully-closed fan-type rotating electric machine is shown in FIGS. That is, with the bearing brackets 2 arranged at both ends of the cylindrical stator frame 1, the stud 3 and the nut 4 are attached.
Ears 5 project from the outer periphery of the bearing bracket 2 for fixing to the stator frame 1 via (not shown). Further, a terminal box 6 for pulling out lead wires is attached to the outside of the stator frame 1. The rotating shaft 7 protruding outside the bearing bracket 2 is attached to the bearing bracket 2
Is rotatably supported by a bearing 8. A fan 9 for cooling is attached to the end of the rotary shaft 7, and the ear 5 of the bearing bracket for guiding the wind by the air blowing action of these fans.
From the fan cover 10 attached to the outer peripheral portion of the stator frame 1 to the plurality of cooling fins 11 attached to the outer peripheral portion of the stator frame 1.
Is designed to be cooled.

[0003]

A part of the cooling air drawn from the fan cover 10 in the above structure flows to cool the cooling fin 11. However, it can be seen from the measurement result of the anemometric distribution shown in the central cross section of the stator in FIG. 7 that the wind speed is extremely low near the terminal box 6 and the ear 5 of the bearing bracket. This is because the cooling air is blocked by the terminal box 6 and the ear 5 of the bearing bracket and does not flow. Therefore, when the rotating electric machine is operated and the temperature of the rotating electric machine rises, heat is conducted to the stator frame 1 and the cooling fins 1 on the outer peripheral surface of the stator frame 1 are transferred.
Heat is dissipated through 1. However, terminal box 6
Also, since the heat transfer coefficient in the vicinity of the ear 5 of the bearing bracket, that is, the heat radiation effect is poor, there is a problem that the temperature of the wind in this portion becomes extremely high.

In order to solve this problem, measures are taken in designing the electric machine such that the magnetic flux density is reduced and the loss generated is reduced to increase the stacking thickness of the stator core. However, there are drawbacks that the weight of the rotating electric machine is heavy and the material cost is high.

The present invention has been made in view of the above circumstances, and an object thereof is to devise a cooling fin attached to the outer periphery of a stator frame to block winds blocked by the ears of a terminal box and a bearing bracket. It is intended to provide a rotating electric machine having a reduced temperature rise by improving the overall thermal conductivity, that is, the heat dissipation effect, by allowing the cooling air to flow around.

[0006]

A rotating electric machine according to the present invention includes a cooling fin attached to a rotating shaft protruding to the outside of the rotating electric machine, a cover and a steel plate for guiding the wind generated by the cooling fan to the outer circumference of the rotating electric machine. In a structure in which a plurality of cooling fins are provided on the outer peripheral surface of a stator frame formed in a cylindrical shape, a structure in which a through hole is formed in the cooling fin near the width of the ears of the terminal box and the bearing bracket is provided. It has characteristics.

[0007]

[Function] Since the cooling air bypasses and flows into the portion where the cooling air is blocked by the ears of the terminal box and the bearing bracket from the portion where the through holes are formed in the cooling fins, the overall heat dissipation effect is improved and the rotating electric machine Reduce temperature rise.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described.

First, referring to FIGS. 1 and 2, bearing brackets 2 arranged at both ends of a cylindrical stator frame 1 are fixed to a stator frame 21 by studs 3 and nuts 4 (not shown). The ears 5 of the bearing bracket project as shown in FIG. Further, a terminal box 6 for pulling out lead wires is attached to the outside of the stator frame 1. Further, the rotating shaft 7 protruding to the outside of the bearing bracket 2 is rotatably supported by the bearing bracket 2 via a bearing 8. A cooling fan 9 is attached to an end of the rotary shaft 7, and a fan cover 10 attached to an outer peripheral portion of an ear of a bearing bracket for guiding air by the air blowing action of the fan cover 10 to an outer peripheral portion of the stator frame 1. The cooling fins 1 attached to the are cooled.

Now, the cooling fins 7 are provided with holes only in the cooling fins 11a, b, c and d which are close to the width of the ears 5 of the terminal box 6 and the bearing bracket. The cooling fins 11 are fixed to the stator frame 1 by welding (Tig or laser) or the like, and are made of a material having good heat conduction and high mechanical rigidity, for example, mild steel, aluminum, copper or the like.

According to the above embodiment, the following effects can be obtained. That is, as shown in FIG. 3, the flow of wind generated by the cooling fan flows along the inside of the fan cover that leads to the outer periphery of the rotary electric machine, and the wind from the outlet of the fan cover flows along the cooling fins. The wind flow between the cooling fins is guided to the rear. However, since the cooling fins 11a, b, c, d have holes, as shown in FIG. Will flow around. In this way, the cooling air flows by bypassing the portion where the cooling air is blocked, so that the overall heat transfer coefficient is improved and the temperature of the rotating electric machine is lowered. (Other embodiments)

In addition, the present invention is not limited to the embodiment shown in the above drawings, and the shape of the holes provided in the cooling fins is not limited as shown in FIG. You may fold it. Various modifications can be made in the implementation without departing from the gist.

[0013]

The frame of the rotating electric machine according to the present invention has a cylindrical cooling fan mounted on a rotary shaft protruding outside the rotating electric machine, a cover for guiding the wind generated by the cooling fan to the outer periphery of the rotating electric machine, and a steel plate. A plurality of cooling fins are provided on the outer peripheral surface of a stator frame formed in a shape of a stator box, and the cooling fins close to the width of the ears of the terminal box and the bearing bracket are formed with through holes to form a stator frame. The effect of equalizing the temperature rise of the respective parts and improving the decrease of the temperature rise of the entire rotary electric machine is exerted.

[Brief description of drawings]

FIG. 1 is a top sectional view showing an embodiment of the present invention,

FIG. 2 is a front half sectional view,

FIG. 3 is a diagram showing the flow of wind,

FIG. 4 is a diagram showing an example of another fin,

FIG. 5 is a view corresponding to FIG. 1 of a conventional example,

FIG. 6 is a view corresponding to FIG. 2 of a conventional example,

FIG. 7 is a distribution chart of wind speed measurement.

[Explanation of symbols]

In the figure, 1 is a stator frame, 2 is a bearing bracket,
3 is a stud, 4 is a nut, 5 is a bearing bracket ear, 6 is a terminal box, 7 is a rotating shaft,
8 is a bearing fan, 9 is a fan,
10 is a fan cover and 11 is a cooling fin.

Claims (1)

[Claims] 1. A cooling fan attached to a rotary shaft protruding to the outside of a rotary electric machine, a cover for guiding the wind generated by the cooling fan to the outer periphery of the rotary electric machine, and a stator frame formed of a steel plate in a cylindrical shape. A frame of a rotating electric machine, wherein a plurality of cooling fins are provided on an outer peripheral surface, and a penetrating hole is formed in the cooling fin near the width of the ears of the terminal box and the bearing bracket.