JP2792272B2 - Cooling device for rotating electric machine stator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device having an axial fan on a rotating shaft of a rotary electric machine and cooling a stator by double flow.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are longitudinal sectional views showing the path of cooling air of a stator of a conventional rotating electric machine. In the figure, the rotating electric machine includes a stator core 3 and a stator winding 4 supported by a stator frame 1, and a ventilation duct 2 behind the stator core 3. A rotor containing a field winding is attached to the rotating shaft 8, and an axial fan 5 fixed to both ends of the rotating shaft 8 is provided.
Supplies cooling air to the rotating electric machine. In FIG. 3, a part of the cooling air 6 sent from the axial flow fan 5 passes through an air gap between the stator core 3 and the rotor, cools the stator core 3 and the stator windings 4, and then cools the stator. It reaches the back of the iron core 3 and is discharged outside the machine through the wind tunnel 9.

FIG. 5 is a cross-sectional view showing a half of a VV cross section of FIG. 4 and 5, a part of the cooling air 6 sent from the fan 5 reaches the back of the stator core 3 through the stator winding end chamber 10, and further passes through the ventilation duct 2, and further passes through the stator core 3. After cooling the stator winding 4, it reaches the back of the stator core 3 again and is discharged from the wind tunnel 9 to the outside of the machine.

[0004]

In FIG. 4 and FIG.
The openings 2a of the plurality of ventilation ducts 2 arranged in the cooling air supply chamber 7 between the stator frame 1 and the back of the stator core 3 open toward the inner diameter side toward the center of the rotating electric machine. The cooling air 6 discharged from the opening 2 a is supplied to the outer diameter side of the stator core 3. Note that the ventilation ducts 2 are dispersedly arranged at several locations so as not to hinder ventilation in other rooms. The cooling air 6 discharged from the ventilation duct 2 enters the stator core 3 and cools the stator core 3 and the stator windings 4. At this time, the main flow discharged from the ventilation duct 2 and the cooling air 6 There is a difference in cooling air flow between the portions between the portions, and the temperature of the stator core 2 and the stator winding 4 may be unbalanced depending on the location.
The temperature of the plurality of stator windings 4 housed in the groove of the stator core 3 is measured by a thermometer. There was a problem that it could not be grasped exactly whether it indicated.

An object of the present invention is to provide a cooling device for uniformly cooling a stator of a rotating electric machine.

[0006]

Means for Solving the Problems A cooling fan is passed through an air gap between a stator and a rotor to a stator core and a stator winding by an axial fan mounted on a rotating shaft, and a stator frame is provided. The cooling air discharged from the openings of the plurality of ventilation ducts arranged in the cooling air supply chamber between the stator core back and the stator core is circulated through the stator core and the stator winding, and the stator core and In the cooling device for a stator of a rotating electric machine that cools the stator winding, the above object is achieved by radially opening openings of the plurality of ventilation ducts toward the stator frame.

In the cooling device for a rotating electric machine stator according to the first aspect of the present invention, if the opening of the ventilation duct is disposed in the cooling air supply chamber at a position where the outer periphery of the stator core is equally divided into a plurality of portions, cooling is performed. This is suitable for making the wind pressure in the wind supply chamber uniform.

[0008]

According to the present invention, the air is discharged from the ventilation duct by radially opening the opening of the ventilation duct of the cooling air supply chamber of the rotating electric machine which cools the stator by the double flow. The cooling air blows against the stator frame and mixes, and the air pressure in the cooling air supply chamber is equalized.Therefore, an equal amount of cooling air flows around the stator core and stator windings all around, and the stator core and stator The child winding can be cooled evenly.

In the cooling device for a rotating electric machine stator according to the present invention, the opening of the ventilation duct may be arranged in the cooling air supply chamber at a position where the outer periphery of the stator core is equally divided into a plurality of parts. The cooling air discharged from the section is evenly distributed, rebounds and hits the stator frame, and is mixed, so that the cooling air supply chamber has uniform air pressure throughout.

[0010]

1 is a sectional view showing a cooling air path of a stator of a rotating electric machine provided with a cooling device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a half of a II-II section in FIG. is there. FIG.
2 and FIG. 2, the same parts as those in FIG. 4, FIG. 5, and FIG. Stator frame 1, Stator core 3,
The stator winding 4, axial fan 5, and rotating shaft 8 are shown in FIG.
Therefore, the description is omitted. The path of the cooling air 6 supplied to the air gap between the stator core 3 and the rotor by the axial fan 5 is the same as in FIG.

In the cooling device according to the embodiment of the present invention, the openings 2a of the plurality of ventilation ducts 2 arranged in the cooling air supply chamber 7 between the stator frame 1 and the back of the stator core 3 are fixed to the stator frame. Radially open outward toward 1. Axial flow fan 5
Of the cooling air 6 sent from the stator winding end chamber 1
0, reaches the back of the stator core 3, enters the cooling air supply chamber 7 through the ventilation duct 2, and opens the opening 2 of the ventilation duct 2.
a, radially outwardly toward the stator frame 1. As a result, the cooling air 6 hits the stator frame 1 and rebounds, is mixed, and the air pressure in the cooling air supply chamber 7 is made uniform,
The stator core 3 and the stator windings 4 are uniformly cooled.

In the example shown in FIG. 2, the cooling air 6 is fixed since the opening 2a of the ventilation duct 2 is disposed in the cooling air supply chamber 7 at a position where the outer periphery of the stator core 3 is equally divided into 14 parts. When hitting the child frame 1, the wind pressure becomes uniform throughout the cooling air supply chamber.

[0013]

According to the present invention, since the opening of the ventilation duct of the cooling air supply chamber is radially opened outward toward the stator frame, the cooling air discharged from the opening is
Once it hits the wall of the stator frame, it is mixed and the air pressure in the cooling air supply chamber is made uniform, and an equal amount of cooling air flows through the stator core and stator winding, so that the temperature of each part of the stator is made uniform. Therefore, the temperature detected by the thermometer accurately indicates the temperature of the stator winding. As a result, the reliability of the rotating electric machine can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a cooling air path of a stator of a rotating electric machine including a cooling device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a half of the II-II cross section of FIG.

FIG. 3 is a longitudinal sectional view showing a path of cooling air of a stator of a conventional rotating electric machine.

FIG. 4 is a longitudinal sectional view showing another route of cooling air of a stator of a conventional rotating electric machine.

FIG. 5 is a sectional view showing a half of a VV section in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator frame 2 Ventilation duct 2a Opening 3 Stator iron core 4 Stator winding 5 Axial fan 6 Cooling air 7 Cooling air supply chamber 8 Rotating shaft

Claims (2)

(57) [Claims] An axial fan mounted on a rotating shaft allows cooling air to flow through an air gap between a stator and a rotor to a stator core and a stator winding, and also allows a stator frame and a stator core to flow. Cooling air discharged from openings of a plurality of ventilation ducts disposed in the cooling air supply chamber between the back and the back is passed through the stator core and the stator winding, and the stator core and the stator winding are A cooling device for a rotating electric machine stator for cooling a wire, wherein openings of the plurality of ventilation ducts are radially opened outward toward the stator frame. 2. The cooling device for a rotating electric machine stator according to claim 1, wherein the opening of the ventilation duct is disposed in the cooling air supply chamber at a position where the outer periphery of the stator core is equally divided into a plurality. A cooling device for a rotating electric machine stator, characterized in that: