JP3522327B2 - Cooling structure of rotating electric machine - Google Patents

Description

Description: 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. 2. Description of the Related Art A conventional rotating electric machine generates heat due to copper loss or iron loss due to the formation of a magnetic field or the flow of electric current inside the rotating electric machine. And the internal temperature tended to increase. 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 above the Curie temperature, or the electric resistance of the conductor increases due to the temperature rise, and the rotating electric machine The performance deteriorates, and furthermore, the deterioration of the electrical insulating material is promoted, and the service life of the rotating electric machine is shortened. [0003] In order to solve such problems,
For example, according to Japanese Utility Model Laid-Open Publication 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. Thus, there is known an apparatus in which an increase in the internal temperature is suppressed. [0004] In the above-mentioned conventional apparatus, it is difficult to increase the cooling efficiency because the stator and the like are indirectly cooled through the internal air, so that the inside of the rotating electric machine is sufficiently cooled. In addition, there is a problem that the cost is increased due to the provision of the heat exchanger. [0005] 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 rotating electric machine without increasing the cost. In order to achieve the above object, the present invention provides a structure for cooling a rotating electric machine having a rotor and a stator, wherein the stator has an uncut portion.
A long hole formed so as to extend in the circumferential direction of the steel plate
Corresponds to the position where one steel sheet and the uncut part are sandwiched
A second steel plate provided with a pair of communication holes, and a plurality of ejection ports
A pair of branch pipes arranged in a row,
The first steel sheet and the second steel sheet are alternately laminated and the pair of
Inserting the pair of branch pipes into the communication hole, the pair of branch pipes
By supplying the refrigerant to the flow pipe, from the jet port
A refrigerant is caused to flow into each of the long holes . According to the present invention, the heat exchanger is not provided separately from the stator, but is provided with a passage inside the stator and allows the refrigerant to flow directly. The stator that is in contact with a certain coil is efficiently cooled, and the amount of heat generated by the coil is prevented from diffusing into the rotating electric machine, thereby suppressing a temperature rise inside the rotating electric machine. Further , the stator is often formed of laminated steel sheets to rectify the flow of magnetic flux. In such a case, each steel sheet constituting the stator is generally formed by punching with a press. Thus, the ratio in the case if provided simultaneously opening serving the passage for refrigerant during press working, it is not necessary to form a passage again stator, also once to form a passage after forming the stator The shape of the passage can be complicated, and the cooling efficiency can be increased. Further , when a stator is formed by laminating annular steel plates, a long hole extending in the circumferential direction of the steel plates can be provided to allow a refrigerant to flow so as to wrap the entire stator, thereby further increasing the cooling efficiency. Can be The uncut portion is for preventing the steel plate from being separated into two by the elongated hole. Referring to FIG. 1, reference numeral 1 denotes a motor, which is a kind of rotating electric machine, and includes a rotor 2 composed of a permanent magnet and a stator 3 composed of a laminated steel sheet and having an exciting coil 31 wound thereon. Have. The stator 3 has an annular front cap 11.
And a disk-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. The steel plate 4 has two uncut portions 4 as shown in FIG.
A pair of symmetrical long holes 42 that face each other across 1 are provided so as to extend in the circumferential direction along the outer edge of the steel plate 4. In addition, round hole 4
Reference numeral 3 is for inserting the through bolt. As shown in FIG. 3, unlike the steel plate 4, the steel plate 5 does not have a long hole, and a pair of communication holes 51 and 52 corresponding to positions facing each other across the uncut portion 41 of the steel plate 4. Was provided. The round hole 53 is for inserting a through bolt like the round hole 43, and the steel plate 6 is not provided with a long hole and a communication hole, but is provided with only a round hole for inserting a through bolt. It is. FIG. 4 shows the laminated state of these steel plates 4, 5, and 6.
As shown in (1), first, a predetermined number of steel plates 4 and one steel plate 5 are alternately stacked on one or several steel plates 6, and finally, the steel plates 5 are stacked. Then, a pair of branch pipes 32 is inserted into the communication hole 51 of each steel plate 5, and
Insert so that it is in contact with or close to. In the dividing pipe 32, ejection ports 32 a each opening to the elongated hole 42 in the inserted state are arranged in line so as to increase in diameter as approaching the tip of the dividing pipe 32. When the insertion of the branch 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. Then, the motor 1 is installed so that the distribution pipe 32 is located on the lower side, and the inflow pipe 13 is connected to the distribution pipe 32 to supply the refrigerant to the distribution pipe 32. Then, the refrigerant in the distribution pipe 32 flows into each of the long holes 42 from the ejection port 32a, and the refrigerant that has reached the upper end of each of the long holes 42 merges through the communication hole 52 and flows out of the outflow pipe 14.
Spills out of the building. The refrigerant may be a gas such as air, a liquid such as water, or any other refrigerant. Further, in the above embodiment, the width of the long hole 42 was set to the same size for each of the steel plates 4. Thereby, the cooling efficiency can be increased. Further, in the above embodiment, the steel plates 5 are laminated with a predetermined number of the steel plates 4 interposed therebetween, but this is for increasing the mechanical strength of the stator. The steel plate 5 may be omitted. Further, although the elongated hole 42 is closed by the steel plate 6, the steel plate 6 may be omitted, and the elongated hole 42 may be closed by the front cap 11. As is apparent from the above description, according to the present invention, since the stator in contact with the coil that generates the most heat in the rotating electric machine is directly and efficiently cooled, the temperature inside the rotating electric machine rises. Can be suppressed, so that the performance of the rotating electric machine does not decrease. Further, since there is no need to separately provide a heat exchanger, it is possible to reduce the cost of the rotating electric machine as compared with a conventional device in which a heat exchanger is separately provided.

[Brief description of the drawings] FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention. FIG. 2 is a view showing a shape of a steel sheet in a II-II cross section. FIG. 3 is a diagram showing another shape of the steel plate in the III-III cross section. FIG. 4 is an exploded view illustrating a laminated state of a laminated steel sheet. [Explanation of symbols] 1 motor 2 rotor 3 Stator 4 Steel plate 5 steel plate 6 steel plate 13 Inflow pipe 14 Outflow pipe 31 Excitation coil 32 diversion pipe 41 Uncut part 42 long hole 51 Communication hole 52 Communication hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 1/20 H02K 9/04

Claims (1)

(57) [Claim 1] In a structure for cooling a rotating electric machine provided with a rotor and a stator, the stator has an uncut portion.
A long hole formed so as to extend in the circumferential direction of the steel plate
Corresponds to the position where one steel sheet and the uncut part are sandwiched
A second steel plate provided with a pair of communication holes, and a plurality of ejection ports
And a predetermined number of the first steel plates and the second steel plates are alternately laminated.
And insert the pair of branch pipes into the pair of communication holes
By supplying a refrigerant to the pair of branch pipes,
And a refrigerant flowing from the jet port into each of the long holes .