JPH07298524A - Cooling structure for electric rotating machine - Google Patents

Abstract

PURPOSE:To cool the interior of an electric rotating machine efficiently without increasing the cost by making a channel for passing refrigerant in the stator. CONSTITUTION:A stator 3 comprises three types of steel plates 4, 5, 6, and the steel plate 4 is provided with a pair of symmetrical holes 42 facing each other through the cut-off parts 41 at two points and elongating in the peripheral direction along the fringe of the steel plate 4. One or several steel plates 6 are laminated alternately with predetermined number of steel plates 4 and one steel plate 5 and a steel plate 5 is laminated finally thereon. A pair of shunt pipes are then inserted into the conduction hole of each steel plate 5 until the pipes abut, at the forward end thereof, on the steel pipe 6 or being set closely thereto. A motor 1 is installed such that the shunt pipe 32 is located on the underside and a flow-in pipe 13 is coupled with the shunt pipe 32. Consequently, a refrigerant in the shunt pipe 32 flows through an ejection port 32a into each elongated hole 42 and combined through the conduction hole before being discharged through a flow-out pipe 14. This structure realizes highly efficient direct cooling of stator touching a hottest coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for cooling a rotating electric machine such as a motor or a generator.

[0002]

2. Description of the Related Art In a conventional rotating electric machine, a magnetic field is formed inside or an electric current flows therethrough, so that heat is generated due to copper loss or iron loss. The temperature tended to rise. However, when the internal temperature rises, when a permanent magnet is used inside the rotating electric machine, the magnetic force of the permanent magnet disappears at the Curie temperature or higher, or the electric resistance of the lead wire increases due to the temperature increase, and The performance deteriorates, and further, the deterioration of the electric insulating material is promoted, which shortens the life of the rotating electric machine.

In order to solve such a problem,
For example, according to Japanese Utility Model Laid-Open No. 58-159872, a heat exchanger separate from the stator is interposed between the stator and the outer wall of the rotating electric machine, and the air circulated in the rotating electric machine is cooled by the heat exchanger. Therefore, it is known that the rise of the internal temperature is suppressed.

[0004]

In the above-mentioned conventional one, it is difficult to enhance the cooling efficiency because the stator and the like are indirectly cooled via the internal air, and it is possible to sufficiently cool the inside of the rotating electric machine. In addition, there is a problem that the cost increases due to the provision of the heat exchanger.

In view of the above problems, an object of the present invention is to provide a cooling structure capable of efficiently cooling the inside of a rotary electric machine without increasing the cost.

[0006]

In order to achieve the above object, the invention of claim 1 is a structure for cooling a rotating electric machine comprising a rotor and a stator, wherein a passage through which a refrigerant flows is formed inside the stator. It is characterized by having done.

According to a second aspect of the invention, in the first aspect of the invention, the stator is formed by laminating a plurality of steel plates.
It is characterized in that the steel plates forming the stator are formed with openings forming the passages in a laminated state.

According to a third aspect of the present invention, in the second aspect of the invention, the steel sheet is annular, and the opening is an elongated hole extending in the circumferential direction of the steel sheet with an uncut portion. Is characterized by.

[0009]

According to the first aspect of the present invention, the heat exchanger is not provided separately from the stator, but a passage is provided inside the stator to allow the refrigerant to flow directly, thereby contacting the coil which is a high heat source. This effectively cools the existing stator, prevents the amount of heat generated by the coil from diffusing into the rotating electric machine, and suppresses the temperature rise inside the rotating electric machine.

By the way, the stator is often formed of laminated steel plates in order to rectify the flow of magnetic flux. In such a case, the steel plates constituting the stator are generally formed by punching by a press. Therefore, if the opening to be the passage for the refrigerant is provided at the same time as the press working as in the invention of claim 2, it is not necessary to form the passage in the stator again, and after forming the stator once. The shape of the passage can be made more complicated than in the case of forming the passage, and the cooling efficiency can be improved.

In particular, when the annular steel plates are laminated to form the stator as in the third aspect of the present invention, a long hole extending in the circumferential direction of the steel plates is provided to allow the coolant to flow so as to wrap the entire stator. The cooling efficiency can be further enhanced. The uncut portion is for preventing the steel plate from separating into two due to the long hole.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 is a motor, which is a kind of rotating electric machine, and is provided with a rotor 2 made of a permanent magnet and a stator 3 made of laminated steel plates and having an exciting coil 31 wound thereon. . The stator 3 has an annular front cap 11
And the disc-shaped back plate 12 and are integrally fastened with through bolts (not shown). The rotor 2 is rotatably supported by the front cap 11 and the end plate 12 via bearings 21 and 22.

The stator 3 is composed of three types of steel plates 4, 5 and 6, and the steel plate 4 has two uncut portions 4 as shown in FIG.
A pair of symmetrical long holes 42 facing each other with the No. 1 sandwiched were provided so as to extend in the circumferential direction along the outer edge of the steel plate 4. Round hole 4
3 is for inserting the through bolt. Further, as shown in FIG. 3, the steel plate 5 does not have an elongated hole unlike the steel plate 4, and each of the pair of communication holes 51 and 52 corresponds to a position facing each other with the uncut portion 41 of the steel plate 4 interposed therebetween. Was set up. The round hole 53 is for inserting a through bolt like the round hole 43, and the steel plate 6 is not provided with an elongated hole and a communicating hole, but is provided with only a round hole for inserting a through bolt. Is.

The laminated state of each of the steel plates 4, 5 and 6 is shown in FIG.
As shown in FIG. 1, first, a predetermined number of steel plates 4 and one steel plate 5 are alternately laminated on one or several steel plates 6, and finally the steel plates 5 are laminated. Then, a pair of diversion pipes 32 are provided in the communication holes 51 of each steel plate 5, and the tip of the diversion pipe 32 is made up of the steel plate 6.
Insert so that it touches or comes close to. It should be noted that the branch pipes 32 are provided with jet outlets 32 a that are respectively opened in the elongated holes 42 in the inserted state so as to become larger in diameter toward the tip of the branch pipe 32. When the insertion of the flow dividing pipe 32 is completed, the front cap 11 is applied to the steel plate 6 side and the end plate 12 is applied to the steel plate 5 side, and these are integrally fastened by the through bolts as described above to assemble the motor 1. Then, the motor 1 is installed so that the diversion pipe 32 is located on the lower side, the inflow pipe 13 is connected to the diversion pipe 32, and the refrigerant is supplied to the diversion pipe 32. Then, the refrigerant in the diversion pipe 32 flows into the elongated holes 42 from the ejection ports 32 a, and the refrigerant reaching the upper end of each elongated hole 42 merges through the communication hole 52 and flows out.
To the outside.

By the way, the refrigerant may be gas such as air, liquid such as water, or any other refrigerant. In addition, in the above-described embodiment, the width of the long hole 42 is set to be the same for all the steel plates 4, but by alternately laminating two kinds of steel plates having different width dimensions of the long hole, the area in which the refrigerant contacts the stator is increased. Thereby, the cooling efficiency can be improved.

Further, in the above-mentioned embodiment, the steel plates 5 are laminated with the predetermined number of the steel plates 4 sandwiched therebetween, but this is for increasing the mechanical strength of the stator, and when the steel plates 4 alone can provide sufficient strength. Alternatively, the steel plate 5 may be omitted. Although the long hole 42 is closed by the steel plate 6, the steel plate 6 may be omitted and the long hole 42 may be closed by the front cap 11.

[0017]

As is apparent from the above description, according to the present invention, the stator in contact with the coil that generates the most heat inside the rotating electric machine is directly and efficiently cooled, so that the temperature rise inside the rotating electric machine is suppressed. Therefore, the performance of the rotating electric machine is not deteriorated. Further, since it is not necessary to separately provide a heat exchanger, the cost of the rotating electric machine can be reduced as compared with the conventional one in which a heat exchanger is separately provided.

[Brief description of drawings]

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

[Fig. 2] Diagram showing the shape of the steel plate in the II-II cross section

FIG. 3 is a view showing another shape of the steel plate in the III-III cross section.

FIG. 4 is an exploded view illustrating a laminated state of laminated steel sheets.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 motor 2 rotor 3 stator 4 steel plate 5 steel plate 6 steel plate 13 inflow pipe 14 outflow pipe 31 exciting coil 32 shunting pipe 41 uncut portion 42 long hole 51 communicating hole 52 communicating hole

Claims (3)

[Claims] 1. A cooling structure for a rotating electric machine, comprising: a structure for cooling a rotating electric machine including a rotor and a stator, wherein a passage for flowing a refrigerant is formed inside the stator. 2. The rotating electric machine according to claim 1, wherein the stator is formed by laminating a plurality of steel plates, and the steel plates forming the stator are provided with openings forming the passages in a laminated state. Cooling structure. 3. The cooling machine for a rotating electric machine according to claim 2, wherein the steel plate has an annular shape, and the opening is an elongated hole extending in a circumferential direction of the steel plate with an uncut portion. Construction.