JP3891083B2 - Cooling structure of rotating electric machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling structure for a rotating electrical machine that efficiently cools a stator of the rotating electrical machine (such as a motor, a generator, or a motor / generator).
[0002]
[Prior art]
Conventionally, in a rotating electrical machine (for example, a motor, a generator, or a motor / generator), a stator core is formed by opening a through hole in the stator core, passing a hollow bolt through the through hole, and flowing a coolant through the hollow bolt. A method of cooling is disclosed (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-336966
[Problems to be solved by the invention]
However, in the above-described prior art, since the distance between the stator coil, which is a heat source, and the refrigerant is large, the performance of cooling the stator coil is not so good due to the influence of the stator core and the hollow bolt.
[0005]
The present invention has been made paying attention to such conventional problems, and an object of the present invention is to provide a cooling structure for a rotating electrical machine excellent in cooling performance.
[0006]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected, it is not limited to this.
[0007]
The present invention includes a rotor (30) connecting the rotary shaft, the coaxially disposed outside the rotor (30), a stator a stator core wound with coils extending in the axial direction a plurality circumferentially disposed (20) , the rotor (30) and the stator (20) are housed inside, a cylindrical part (11) having both ends open, and a U-shaped cross section, and bolted to the cylindrical part (11). A three-body case (10) having first and second cylindrical bottom portions (12, 13) for closing both ends of the opening of the cylindrical portion (11) and sandwiching the stator (20), and the case The first refrigerant passage (7) formed by the recess in the inner wall of the cylindrical portion (11) of (10) and the outer periphery of the stator (20), the cylindrical portion (11) and the first cylinder Contact surface with the bottom (12), and the cylindrical portion (11) and the front It is disposed on the contact surface between the second cylinder bottom portion (13), formed between the refrigerant leakage preventing member (15) in which the first refrigerant passage (7) to prevent leakage of refrigerant flowing through, adjacent the stator core The second refrigerant passage (24) is provided.
[0008]
[Action / Effect]
According to the present invention, since the coil and the stator core can be cooled by the refrigerant flowing through the first and second refrigerant passages, excellent cooling performance is exhibited.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
[0010]
1 and 2 are cross-sectional views showing a rotating electrical machine according to an embodiment of the present invention. 1 is a view taken in the direction of arrows I-I in FIG. 2, and FIG. 2 is a view taken in the direction of arrows II-II in FIG.
The rotating electrical machine 1 includes a case 10, a stator 20, and a rotor 30, and functions as, for example, a motor, a generator, a motor / generator, or the like.
[0011]
The case 10 has a cylindrical portion 11 and cylindrical bottom portions 12 and 13.
[0012]
The cylindrical portion 11 is a cylindrical member having both ends open, and a stator 20 is disposed on the inner periphery thereof. Moreover, the cylindrical part 11 has a recessed part formed in a part of the inner wall near the center, and its cross section is concave as shown in the lower part of FIG. As will be described later, a cooling water supply port and a cooling water discharge port communicate with the recess, and the recess is used as the cooling water passage 7.
[0013]
The cylinder bottom portions 12 and 13 are members that close the openings at both ends of the cylindrical portion 11 in the axial direction. The cylinder bottom parts 12 and 13 are cylindrical members whose one ends are closed by a disk. As shown in FIG. 1, the cross sections of the cylinder bottom portions 12 and 13 have a “U” shape. The cylindrical bottom portions 12 and 13 are fixed to the cylindrical portion 11 by bolts 14 and sandwich the stator 20.
[0014]
The cylinder bottom portions 12 and 13 are provided with bearings 12d and 13d that rotatably support a rotating shaft 32 (described later) of the rotor 30.
[0015]
An O-ring 15 is disposed on the contact surface between the cylinder bottom portions 12 and 13 and the cylindrical portion 11 to prevent leakage of the cooling water flowing through the cooling water passage 7.
[0016]
A cooling oil supply passage 8 is formed in the cylindrical portions of the cylindrical portion 11 and the cylindrical bottom portion 12. In FIG. 1, the cooling oil supply passage 8 is illustrated in the upper part. One end of the cooling oil supply passage 8 is formed in the vicinity of the cylinder bottom portion 13 and communicates with an oil supply port 8 a that opens to the outer surface of the cylinder portion 11. The other end of the cooling oil supply passage 8 communicates with a first cooling oil chamber 24a (described later).
[0017]
A cooling oil discharge passage 9 is formed in the cylindrical portions of the cylindrical portion 11 and the cylindrical bottom portion 13. In FIG. 1, the cooling oil discharge passage 9 is illustrated in the lower part. One end of the cooling oil discharge passage 9 is formed in the vicinity of the cylinder bottom portion 12 and communicates with an oil discharge port 9 a that is open to the outer surface of the cylinder portion 11. The other end of the cooling oil discharge passage 9 communicates with a second cooling oil chamber 24b (described later).
[0018]
The cooling oil supply passage 8 and the cooling oil discharge passage 9 are alternately formed at equal intervals in the circumferential direction of the cylindrical portion 11 (see FIG. 2). In FIG. 2, six cooling oil supply passages 8 and six cooling oil discharge passages 9 are formed.
[0019]
The stator 20 is provided on the inner periphery of the cylindrical portion 11 of the case 10 and is sandwiched between the cylinder bottom portions 12 and 13 from both sides.
[0020]
The stator 20 includes a stator core 21 and a stator coil 22 (see FIG. 4). Moreover, cylindrical stator inner peripheral wall surfaces 23a and 23b are formed on the rotor-side surface (inner peripheral surface) of the stator, and one end of each of the stator inner peripheral wall surfaces 23a and 23b is the cylinder bottom portions 12 and 13. It is fixed to.
[0021]
The stator inner peripheral wall surface 23 a is a refrigerant chamber forming member that defines the first cooling oil chamber 24 a together with the stator core 21 and the cylinder bottom 12.
[0022]
The stator inner peripheral wall surface 23 b is a refrigerant chamber forming member that defines the second cooling oil chamber 24 b together with the stator core 21 and the cylinder bottom portion 13.
[0023]
The rotor 30 is disposed inside the stator 20. The rotor 30 includes a columnar rotor core 31 and a rotating shaft 32 that is disposed through the central axis of the rotor core 31. Both ends of the rotating shaft 32 are supported by the cylinder bottom portions 12 and 13 via bearings 12d and 13d, respectively, and are rotatable. A magnet 31 a is arranged in the vicinity of the outer peripheral surface of the rotor 30.
[0024]
FIG. 3 is a perspective view of the stator core.
[0025]
The stator core 21 is formed by laminating a number of substantially T-shaped electromagnetic steel plates each having a back core 21a and teeth 21b extending from the back core 21a toward the inner periphery. A resin layer 21f is formed on a surface of the back core 21a on the case 10 side (an upper surface in FIG. 3). In addition, about half of the key 25 is embedded in the back core 21a.
[0026]
4 is a view taken in the direction of arrows IV-IV in FIG.
The stator 20 is fixed to the cylindrical portion 11 of the case 10 by the fitting of the key 25, so that the stator 20 cannot rotate with respect to the case 10. In addition, an insulating cap 21d is attached to the tooth 21b, and the stator coil 22 is concentratedly wound thereon. This insulating cap 21 d has an insulating performance and prevents conduction between the stator core 21 and the stator coil 22. Further, the surface of the insulating cap 21d is the end face of the stator 20 (see FIG. 1).
[0027]
A space between the teeth 21b is a slot 21c, and the stator coil 22 is passed through the slot 21c. The slot 21c is a groove-like space opened at both end portions in the axial direction and the radially inner peripheral side. The slot 21c is used to cool the stator coil 22 by closing the opening portion on the radially inner peripheral side with the resin 21e. The slot 21c is used as an oil passage 24 through which cooling oil can flow. The oil passage 24 thus formed communicates the first cooling oil chamber 24a and the second cooling oil chamber 24b. Therefore, the oil taken in from the cooling oil supply passage 8 passes through the first cooling oil chamber 24a, the oil passage 24, and the second cooling oil chamber 24b and is discharged from the cooling oil discharge passage 9, The heat of the stator coil 22 is absorbed.
[0028]
FIG. 5 is a VV arrow view of FIG.
Near the center of the cylindrical portion 11, a recess is formed in the inner peripheral portion of the cylindrical portion 11, and a space exists between the cylindrical portion 11 and the stator 20. This space is the cooling water passage 7. In the cooling water passage 7, the key 25 is not fitted into the cylindrical portion 11 of the case 10.
[0029]
The cylindrical portion 11 is formed with a cooling water supply port 7a and a cooling water discharge port 7b communicating with the cooling water passage 7, so that the cooling water can flow therethrough.
[0030]
Further, a resin layer 21f as a refrigerant intrusion preventing means is formed on the surface of the stator core 21 (back core 21a) on the cooling water passage 7 side (see FIG. 3). The resin layer 21f prevents the leakage of cooling water from between the laminated electromagnetic steel sheets and the generation of rust on the electromagnetic steel sheets.
[0031]
Further, a seal 26 is disposed between the cylindrical portion 11 and the key 25 of the stator 20, and the seal 26 discharges the cooling water supplied from the cooling water supply port 7 a and the cooling water discharge port 7 b. The cooling water is partitioned.
[0032]
Therefore, the cooling water supplied from the cooling water supply port 7a flows through the cooling water passage 7 as shown by arrows in FIG. 5, cools the stator core 21, and is discharged from the cooling water discharge port 7b.
[0033]
With the above structure, the heat generated from the stator coil 22 is cooled by the cooling oil flowing through the oil passage 24 and the cooling water flowing through the stator core 21 and flowing through the cooling water passage 7.
[0034]
Further, by using different refrigerants, a high-temperature refrigerant can be cooled by a low-temperature refrigerant due to a temperature difference of the refrigerant.
[0035]
According to the present embodiment, the cooling oil is allowed to flow through the oil passage 24 and the stator coil 22 is directly cooled while maintaining insulation without causing rust, so that the cooling performance is excellent.
[0036]
Further, since the resin layer 21f is formed on the surface of the stator core 21 (back core 21a) on the cooling water passage 7 side, the leakage of cooling water to the electromagnetic steel sheet can be prevented, and rust is not generated on the electromagnetic steel sheet. .
[0037]
Furthermore, by providing the stator inner peripheral wall surfaces 23a and 23b, the periphery of the stator coil can be sealed, so that the refrigerant can flow intensively through the coil.
[0038]
In addition, according to the present embodiment, since there is a space between the stator core and the case except for the portion where the key is fitted, the stator core can be fixed to the case while the cooling water passage 7 is secured.
[0039]
Further, since the seal 15 is provided, the sealing performance between the cylindrical portion 11 and the cylindrical bottom portions 12 and 13 can be secured, and leakage of the cooling water flowing through the cooling water passage 7 is prevented.
[0040]
It should be noted that the present invention is not limited to the embodiment described above, and various modifications and changes can be made within the scope of the technical idea, and it is obvious that these are equivalent to the present invention. For example, the size and quantity of the cooling oil supply passage and the like may be appropriately adjusted according to the system size and performance.
[0041]
Furthermore, in the present embodiment, the case where two different types of refrigerant are used has been described, but the same refrigerant may be used.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rotating electrical machine of the present invention as viewed from a direction perpendicular to the axis.
FIG. 2 is a cross-sectional view of the rotating electrical machine of the present invention viewed from the axial direction.
FIG. 3 is a perspective view of a stator core.
4 is a view taken along arrow IV-IV in FIG. 1;
FIG. 5 is a VV arrow view of FIG. 1;
[Explanation of symbols]
1 Rotating electrical machine 7 Cooling water passage (first refrigerant passage)
8 Cooling oil supply passage 9 Cooling oil discharge passage 10 Case 15 Seal (refrigerant leakage preventing member)
20 Stator 21 Stator core 21b Teeth 21c Slot 21e Resin (slot closing member)
21f Resin layer (refrigerant entry prevention means)
24 oil passage (second refrigerant passage)
30 rotor

Claims (6)

A rotor coupled to the rotating shaft;
A stator arranged coaxially on the outside of the rotor and arranged in a circumferential direction with a plurality of stator cores extending in the axial direction and wound with coils ; and
The rotor and the stator are housed inside, and a cylindrical portion having both ends open, and a U-shaped cross section that is bolted to the cylindrical portion to close both ends of the cylindrical portion, and holds the stator And a three-body case having a second tube bottom ,
A first refrigerant passage formed by a recess in the inner wall of the cylindrical portion of the case and the outer periphery of the stator;
Arranged on the contact surface between the cylindrical portion and the first tube bottom portion and the contact surface between the cylinder portion and the second tube bottom portion to prevent leakage of the refrigerant flowing through the first refrigerant passage. A refrigerant leakage prevention member;
A second refrigerant passage formed between adjacent stator cores;
A cooling structure for a rotating electrical machine comprising: Wherein the first refrigerant passage flows cooling water as a coolant, a cooling structure of a rotating electrical machine according to claim 1 wherein the second refrigerant passage, characterized in that flowing cooling oil as a coolant. The second refrigerant passage is disposed in the vicinity of the tooth tip rotation according to claim 1 or claim 2, characterized in that it is formed by a slot closure member for closing the slot opening of between the teeth Electric cooling structure. Formed on the outer peripheral surface of the stator core, the refrigerant first flows through the refrigerant passage of, the claims 1 to 3, characterized in that it comprises a refrigerant intrusion prevention means for preventing the entering into the stator core The rotating electrical machine cooling structure described. Wherein formed between the stator core and the casing, the cooling structure of the rotating electrical machine according to claims 1 to 4, characterized in that it comprises a coolant chamber forming member defining a coolant chamber with its stator core and the case. Provided between the stator core and the casing, the cooling structure of the rotary electric machine according to claim 1, claim 5, characterized in that it comprises a key fitting member for fixing the the stator core and the case.

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