Fully enclosed rotating electrical machine

Abstract

To obtain a fully enclosed type rotary electric machine with a new structure which is improved so as to reduce inconveniences.SOLUTION: A fully enclosed type rotary electric machine of an embodiment includes a case, a stator, a rotor iron core, a spider, a rotary shaft, a partition disc, and a fan. The partition disc extends from the rotor iron core toward a second end wall and partitions the interior of the case into a sealed space, in which the stator is housed, and an upstream side air passage which extends from a first air passage of the rotor iron core and a second air passage of the spider and reaches a first suction port provided at a radial inner end of the second end wall at the radial inner side relative to the sealed space. The fan extends from the rotor iron core to a first end wall, partitions the interior of the case into the sealed space and a downstream side air passage which extends from the first air passage and the second air passage toward the first end wall side at the radial inner side relative to the sealed space, and rotates integrally with the rotor shaft to generate airflow flowing from the upstream side air passage to the downstream side air passage via the first air passage and the second air passage.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to a totally enclosed rotating electrical machine.

Background Art

[0002] Conventionally, there has been known a totally enclosed rotating electrical machine including a stator, a rotor core disposed to face the inner peripheral surface of the stator and provided with an air passage penetrating in the axial direction, a rotor shaft attached to the inner peripheral portion of the rotor core and rotatably supported by a pair of bearings in a case, a fan fixed to one axial end portion of the rotor core, and a partition disk fixed to the other axial end portion of the rotor core.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In this type of totally enclosed rotating electrical machine, it would be beneficial to obtain a novel configuration improved to have fewer inconveniences.

Means for Solving the Problems

[0005] The totally enclosed rotating electrical machine according to the embodiment includes a case, a stator, a rotor core, a spider, a rotor shaft, a partition disk, and a fan. The case has a cylindrical frame, a first end wall covering one axial end of the frame, and a second end wall covering the other axial end of the frame. The stator is fixed to the inner peripheral surface of the frame. The rotor core is arranged to face the inner peripheral surface of the stator and is provided with a first air passage penetrating in the axial direction. The spider is fixed to the inner peripheral surface of the rotor core, is provided with a second air passage penetrating in the axial direction, and extends in the axial direction more than the rotor core. The rotor shaft is fixed to the inner peripheral portion of the spider and is rotatably supported by the first end wall and the second end wall via a pair of bearings provided at both axial ends. The partition disk is fixed to the outer peripheral surface of the rotor shaft, extends from the rotor core toward the second end wall, and partitions the sealed space in the case where the stator is accommodated and the upstream air passage leading from the first air passage and the second air passage to the radially inner end of the second end wall inside the radially inner side of the stator with respect to the sealed space. The fan is fixed to the outer peripheral surface of the rotor shaft, extends from the rotor core toward the first end wall, partitions the sealed space in the case and the downstream air passage leading from the first air passage and the second air passage toward the first end wall side inside the radially inner side of the sealed space, and generates an air flow from the upstream air passage toward the downstream air passage side via the first air passage and the second air passage by rotating integrally with the rotor shaft.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Best Mode for Carrying Out the Invention

[0007] Exemplary embodiments and modifications of the present invention will be disclosed below. The configurations of the embodiments and modifications shown below, as well as the operations and effects brought about by the configurations, are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments and modifications. Further, according to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by the configuration.

[0008] In addition, the embodiments and modifications disclosed below include similar components. Therefore, hereinafter, the same reference numerals will be given to those similar components, and redundant descriptions will be omitted. In this specification, ordinal numbers are used only for distinguishing parts, members, parts, positions, directions, etc., and do not indicate order or priority.

[0009] [Embodiment] FIG. 1 is a cross-sectional view of a totally enclosed rotating electrical machine 1 according to an embodiment. The totally enclosed rotating electrical machine 1 shown in FIG. 1 is configured as a motor mounted on a railway vehicle, and includes a stator 2, a rotor shaft 3, a rotor core 4, a spider 5, a fan 7, a partition disk 8, a case 10, and the like. The totally enclosed rotating electrical machine 1 is connected so as to be able to transmit a rotational force (torque) to the wheels of the railway vehicle via a coupling, a gear box, etc. (not shown).

[0010] In the following description, for convenience, the axial direction of the rotation center Ax of the totally enclosed rotating electrical machine 1 will be simply referred to as the axial direction, the radial direction of the rotation center Ax will be simply referred to as the radial direction, and the circumferential direction of the rotation center Ax will be simply referred to as the circumferential direction. Also, in the figure, one end side (drive side, coupling side) in the axial direction is indicated by an arrow X, and the outer side in the radial direction is indicated by an arrow R.

[0011] The case 10 has a frame 11 and a plurality of brackets 6, 13, 14. The frame 11 is configured in a double cylindrical shape centered on the rotation center Ax. That is, the frame 11 has an outer cylindrical portion 11a and an inner cylindrical portion 11b. A downstream air passage 10c through which an air flow W generated by the rotation of a fan 7 described later flows is provided between the outer cylindrical portion 11a and the inner cylindrical portion 11b.

[0012] An exhaust port 10d is provided at the other axial end of the outer cylindrical portion 11a. The exhaust port 10d constitutes the open end of the downstream air passage 10c. The downstream air passage 10c is surrounded by the outer cylindrical portion 11a, the inner cylindrical portion 11b, the brackets 6, 13, the fan 7, etc., and extends axially and radially so as to surround the stator 2 from one axial end of the rotor core 4. The exhaust port 10d communicates with an air passage 4a of the rotor core 4 and an air passage 5a of the spider 5, which will be described later, through this downstream air passage 10c. The exhaust port 10d is an example of a first exhaust port.

[0013] In addition, a recess 11c is provided on the inner peripheral surface 11d of the inner cylindrical portion 11b. The recess 11c is recessed outward in the radial direction from the inner peripheral surface 11d and is open inward in the radial direction. The stator core 2a of the stator 2 is fixed in a state of being axially sandwiched in the recess 11c. The side surface of the recess 11c functions as a core retainer.

[0014] The bracket 6 is attached to one axial end of the outer cylindrical portion 11a. The bracket 6 is configured in a disk shape that spreads along the radial direction and the circumferential direction, and covers the downstream air passage 10c from one axial end side. The bracket 6 is overlapped axially with an end wall 11e1 extending radially inward from one end of the outer cylindrical portion 11a and is fastened (integrated) by a coupling tool such as a screw or a bolt.

[0015] Bracket 13 is attached to the inner peripheral portion of bracket 6. Bracket 13 is fastened (integrated) to bracket 6 via a coupling tool such as a screw or a bolt. Further, a bearing 16a is attached to the inner peripheral surface of bracket 13. The bearing 16a is constituted by a roller bearing or the like. The bearing 16a is an example of a first bearing, and brackets 6, 13 and end wall 11e1 are an example of a first end wall covering one axial end portion of the frame 11.

[0016] Bracket 14 is attached to the inner peripheral portion of an end wall 11e2 that extends radially inward from the other axial end portion of the inner cylinder portion 11b. Bracket 14 is fastened (integrated) to end wall 11e2 via a coupling tool such as a screw or a bolt. Further, a bearing 16b is attached to the inner peripheral surface of bracket 14. The bearing 16b is constituted by a ball bearing or the like. The bearing 16b is an example of a second bearing, and bracket 14 and end wall 11e2 are an example of a second end wall covering the other axial end portion of the frame 11.

[0017] Further, an air inlet 10a is provided near the bearing 16b in the end wall 11e2. The air inlet 10a communicates with an upstream air passage 10b located on the other axial end portion side of the rotor core 4 in the case 10. The upstream air passage 10b is surrounded by the end wall 11e2, bracket 14, partition disk 8, and the like. The air inlet 10a communicates with the air passage 5a of the spider 5 and the air passage 4a of the rotor core 4 via this upstream air passage 10b. The air inlet 10a is an example of a first air inlet.

[0018] The stator 2 has a stator core 2a and a coil 2b. The stator core 2a is configured in an annular shape centered on the rotation center Ax and is fixed to the inner peripheral surface 11d of the frame 11. The stator core 2a is a so-called laminated core constituted by laminating a plurality of steel plates 2c made of a magnetic material in the axial direction. The coil 2b is embedded in a slot provided in the inner peripheral portion of the stator core 2a. The coil ends of the coil 2b protrude from both axial end faces of the stator core 2a.

[0019] Here, in the present embodiment, the stator 2 is housed in a sealed space 9 surrounded by the inner cylindrical portion 11b of the frame 11, the rotor core 4, the fan 7, and the partition disk 8. The stator 2 generates a magnetic field inside the case 10 by energizing the coil 2b, and the rotor core 4 and thus the rotor shaft 3 located radially inward of the stator 2 are rotated in the circumferential direction around the rotation center Ax by the interaction with the magnetic field.

[0020] The rotor core 4 is configured in an annular shape. The outer peripheral surface of the rotor core 4 faces the inner peripheral surface 2d of the stator core 2a with a slight radial gap therebetween. Further, a rotor shaft 3 is attached to the inner peripheral portion of the rotor core 4 and extends along the axial direction inside the case 10. The rotor shaft 3 is rotatably supported by end walls 11e1 and 11e2 via a pair of bearings 16a and 16b provided at both axial ends. One axial end portion 3a of the rotor shaft 3 protrudes outside the case 10, and a joint for connecting a drive gear device is attached to this protruding portion.

[0021] The inner peripheral surface 4d of the rotor core 4 is fixed to the cylindrical portion 5b of the spider 5. The rotor core 4 is configured by axially laminating a plurality of steel plates 4b made of a magnetic material. Further, the rotor core 4 is fixed in a state of being sandwiched from both axial sides by the flange 5c of the spider 5 and the core retainer 15. The core retainer 15 is configured in an annular shape and supports one axial end surface of the rotor core 4.

[0022] In addition, the rotor core 4 is provided with air passages 4a penetrating the plurality of steel plates 4b in the axial direction. One axial end portion of the air passage 4a communicates with the downstream air passage 10c through the through hole 15a of the core retainer 15 and the through hole 7b of the fan 7, and the other axial end portion of the air passage 4a communicates with the upstream air passage 10b through the through hole 5d of the spider 5 and the through hole 8b of the partition disk 8. In the present embodiment, the rotor core 4 is provided with a plurality of air passages 4a spaced apart from each other in the circumferential direction. The air passage 4a is an example of a first air passage.

[0023] The spider 5 has a cylindrical portion 5b and a flange 5c. The cylindrical portion 5b is configured in a cylindrical shape centered on the rotation center Ax. The cylindrical portion 5b is interposed between the rotor shaft 3 and the rotor core 4 and is fixed to the outer peripheral surface of the rotor shaft 3 by press-fitting, key fitting, or the like. Further, the cylindrical portion 5b extends axially beyond the rotor core 4 and spans between the fan 7 and the partition disk 8. The inner peripheral surface 4d of the rotor core 4 is fixed to the outer peripheral surface of the cylindrical portion 5b by press-fitting, key fitting, or the like.

[0024] Here, in the present embodiment, the cylindrical portion 5b is provided with an air passage 5a that axially penetrates the cylindrical portion 5b. The air passage 5a is configured in a slit shape with a smaller radial width than the air passage 4a. One axial end of the air passage 5a communicates with the downstream air passage 10c via the through hole 7c of the fan 7, and the other axial end of the air passage 5a communicates with the upstream air passage 10b via the through hole 8c of the partition disk 8. In the present embodiment, a plurality of air passages 5a are provided in the cylindrical portion 5b at intervals in the circumferential direction. The air passage 5a is an example of a second air passage.

[0025] The flange 5c protrudes radially outward from the other axial end of the cylindrical portion 5b. The flange 5c is configured in an annular plate shape centered on the rotation center Ax and supports the other axial end face of the rotor core 4. Further, the flange 5c is provided with a through hole 5d that axially penetrates and communicates axially with the air passage 4a of the rotor core 4 described above.

[0026] The partition disk 8 is provided adjacent to the other axial end side of the flange 5c. The partition disk 8 is configured in a funnel shape (trumpet shape). Specifically, in the cross-sectional view of FIG. 1, the partition disk 8 extends inclined so as to go radially outward toward the other axial end side from the flange 5c side toward the end wall 11e2. The partition disk 8 is fixed to the outer peripheral surface of the rotor shaft 3 by press-fitting, key fitting, or the like.

[0027] Further, on the outer peripheral edge portion 8e of the partition disk 8, a claw portion 8d protruding toward the other end side in the axial direction is formed. On the other hand, on the inner peripheral edge portion 11i on the inner side where the end wall 11e2 branches into two branches, a claw portion 11h protruding toward the one end side in the axial direction is formed. The claw portion 8d and the claw portion 11h are engaged with each other via an annular minute gap. In the present embodiment, an annular minute gap is formed in an uneven shape in a cross-sectional view of FIG. 1 between the claw portion 8d and the claw portion 11h, thereby forming a labyrinth structure.

[0028] The partition disk 8 partitions a substantially sealed closed space 9 in which the stator 2 is accommodated by the above-described configuration and an upstream air passage 10b that extends from the air passages 4a and 5a to the air inlet 10a radially inward of the closed space 9. Note that a plurality of through holes 8b and 8c that penetrate in the axial direction and form a part of the air passages 4a and 5a are provided at the bottom 8a on the side opposite to the outer peripheral edge portion 8e of the partition disk 8, that is, on the one end side in the axial direction.

[0029] The fan 7 is provided adjacent to the one end side in the axial direction of the core retainer 15 and the cylindrical portion 5b. The fan 7 has a plurality of blades 7a and a main plate 7f. The main plate 7f is configured in a funnel shape (trumpet shape). Specifically, in a cross-sectional view of FIG. 1, the main plate 7f extends while being inclined so as to face radially outward toward the one end side in the axial direction from the core retainer 15 side toward the end wall 11e1. The main plate 7f is fixed to the outer peripheral surface of the rotor shaft 3 by press fitting, key fitting, or the like.

[0030] Further, on the outer peripheral edge portion 7e of the main plate 7f, a claw portion 7d protruding toward the other end side in the axial direction is formed. On the other hand, on the inner peripheral edge portion 11g of a portion that extends radially inward from the one end side in the axial direction of the inner cylinder portion 11b, a claw portion 11f protruding toward the one end side in the axial direction is formed. The claw portion 7d and the claw portion 11f are engaged with each other via an annular minute gap. In the present embodiment, an annular minute gap is formed in an uneven shape in a cross-sectional view of FIG. 1 between the claw portion 7d and the claw portion 11f, thereby forming a labyrinth structure.

[0031] The fan 7 partitions a sealed space 9 in which the stator 2 is accommodated by the above-described configuration and a downstream air passage 10c that is radially inward of the sealed space 9 and extends from the air passages 4a and 5a toward the end wall 11e1. The downstream air passage 10c extends radially outward at one axial end side of the sealed space 9 and extends radially outward of the sealed space 9 toward the other axial end side to reach the exhaust port 10d. Note that a plurality of through holes 7b and 7c that penetrate axially and form part of the air passages 4a and 5a are provided at the bottom on the side opposite to the outer peripheral edge 7e of the main plate 7f, that is, at the other axial end side.

[0032] The blades 7a are provided on the surface of the inclined portion of the main plate 7f on the side opposite to the sealed space 9, that is, on the downstream air passage 10c side. The plurality of blades 7a extend radially about the rotation center Ax. The plurality of blades 7a may be arranged at equal or unequal intervals in the circumferential direction of the main plate 7f.

[0033] The blades 7a of the fan 7 can generate an air flow W that is introduced from the intake port 10a into the upstream air passage 10b by rotation around the rotation center Ax and travels toward the downstream air passage 10c side via the plurality of air passages 4a and 5a. The air flow W introduced into the downstream air passage 10c flows through a radially outward extending portion surrounded by the fan 7 and the bracket 6 in the downstream air passage 10c and an axially extending portion surrounded by the outer cylinder portion 11a and the inner cylinder portion 11b, exchanges heat with the inner cylinder portion 11b (stator 2), and is discharged to the outside from the exhaust port 10d of the frame 11.

[0034] As described above, in the present embodiment, the totally enclosed rotating electric machine 1 includes a cylindrical frame 11, an end wall 11e1 (first end wall) covering one end portion of the frame 11 in the X direction (axial direction), an end wall 11e2 (second end wall) covering the other end portion of the frame 11 in the axial direction, a case 10 having these, a stator 2 fixed to the inner peripheral surface 11d of the frame 11, a rotor core 4 disposed to face the inner peripheral surface 2d of the stator 2 and provided with an air passage 4a (first air passage) penetrating in the X direction, a rotor shaft 3 attached to the inner peripheral portion of the rotor core 4, extending in the X direction within the case 10, and rotatably supported by a pair of bearings 16a and 16b on the end walls 11e1 and 11e2, a spider 5 fixed between the outer peripheral surface of the rotor shaft 3 and the inner peripheral surface 4d of the rotor core 4, rotatable integrally with the rotor shaft 3 and the rotor core 4, and provided with an air passage 5a (second air passage) penetrating in the X direction, a partition disk 8 fixed to the other end portion of the rotor core 4 in the X direction, extending from the rotor core 4 toward the end wall 11e2, partitioning the sealed space 9 in which the stator 2 is accommodated within the case 10 and the upstream air passage 10b leading from the air passages 4a and 5a to the radially inner end portion of the end wall 11e2 on the radially inner side of the sealed space 9, a fan 7 fixed to one end portion of the rotor core 4 in the X direction, extending from the rotor core 4 toward the end wall 11e1, partitioning the sealed space 9 within the case 10 and the downstream air passage 10c leading from the air passages 4a and 5a toward the end wall 11e1 side on the radially inner side of the sealed space 9, and generating an air flow W flowing from the upstream air passage 10b through the air passages 4a and 5a toward the downstream air passage 10c side by rotating integrally with the rotor core 4.

[0035] According to such a configuration, the rotor core 4 and the spider 5 can form a plurality of air passages 4a and 5a spaced apart from each other in the radial direction in the rotor portion of the totally enclosed rotating electric machine 1. Thereby, compared with the case where a plurality of air passages are provided in the rotor core 4 only with spaces in the radial direction, while suppressing a decrease in the rigidity and strength of the rotor core 4, it is possible to more effectively suppress a temperature rise of the pair of bearings 16a and 16b, the rotor core 4, the rotor shaft 3, and the like by the air flow W.

[0036] In addition, the spider 5 interposed between the rotor shaft 3 and the rotor core 4 enables the rotor shaft 3 to be more easily or smoothly attached to or detached from the rotor core 4, and thus the workability of maintenance, repair, etc. of the rotor shaft 3 can be improved. Further, compared with the case where the fans 7, the intake port 10a, the exhaust port 10d, etc. are provided independently in the upstream air passage 10b and the downstream air passage 10c in the case 10, the totally enclosed rotating electric machine 1 can be more simply configured, and thus the labor and cost required for manufacturing the totally enclosed rotating electric machine 1 can be reduced, or the totally enclosed rotating electric machine 1 can be configured to be smaller.

[0037] [First Modification Example] FIG. 2 is a cross-sectional view of the totally enclosed rotating electric machine 1A according to the first modification example. The totally enclosed rotating electric machine 1A has the same configuration as the totally enclosed rotating electric machine 1 of the above embodiment. Therefore, the totally enclosed rotating electric machine 1A can obtain the same operations and effects as those of the above embodiment based on the same configuration.

[0038] However, in this modification example, as shown in FIG. 2, the intake port 12a is provided at the radially inner end of the end wall 11e1, which is different from the above embodiment. The intake port 12a communicates with the downstream air passage 10c and can introduce outside air near the bearing 16a in the downstream air passage 10c. The intake port 12a is an example of a second intake port.

[0039] In this modification example, the fan 7 generates an air flow W that is sucked from the two intake ports 10a and 12a by rotation around the rotation center Ax and exhausted from one exhaust port 10d. The air flow W includes an air flow W that is introduced from the intake port 10a into the upstream air passage 10b, passes through the air passage 4a of the rotor core 4 or the air passage 5a of the spider 5, and the downstream air passage 10c in this order and is exhausted from the exhaust port 10d, and an air flow W that is introduced from the intake port 12a into the downstream air passage 10c and is exhausted from the exhaust port 10d only through the downstream air passage 10c.

[0040] Thus, according to this modification example, by the intake port 12a, the bearing 16a can perform heat exchange with the colder air flow W before performing heat exchange with other heat generating parts such as the bearing 16b and the rotor core 4. As a result, the temperature rise of the bearing 16a can be more effectively suppressed, and thus it is possible to suppress the cooling performance of the bearing 16a by the air flow W from decreasing compared to the cooling performance of the bearing 16b.

[0041] [Second Modification Example] FIG. 3 is a cross-sectional view of the totally enclosed rotating electrical machine 1B of the second modification example. The totally enclosed rotating electrical machine 1B has the same configuration as the totally enclosed rotating electrical machine 1 of the above embodiment. Therefore, the totally enclosed rotating electrical machine 1B can obtain the same operations and effects as the above embodiment based on the same configuration.

[0042] However, in this modification example, as shown in FIG. 3, an exhaust port 12b is provided at the radially outer end of the end wall 11e1, and the fan 7 is constituted by a two-layer cooling fan having first blades 7a1 and second blades 7a2 arranged in the axial direction, which is different from the above embodiment. The exhaust port 12b is an example of the second exhaust port.

[0043] In this modification example, the main plate 7f of the fan 7 has a first portion 7f1 and a second portion 7f2. The first portion 7f1 and the second portion 7f2 are arranged at intervals in the axial direction, and in a cross-sectional view of FIG. 3, they are inclined so as to be radially outward toward one axial end side from the core retainer 15 side toward the end wall 11e1 and extend parallel to each other. The outer peripheral edge 7e of the first portion 7f1 is engaged with the inner peripheral edge 11g of the inner cylinder portion 11b described above via the claw portions 7d and 11f. The first portion 11f1 partitions the downstream air passage 10c and the sealed space 9 in which the stator 2 described above is accommodated.

[0044] Also, regarding the outer peripheral edge portion 7e of the second portion 7f2, a claw portion 7d protruding toward the other end side in the axial direction is formed, while a claw portion 11f protruding toward the one end side in the axial direction is formed on the inner peripheral edge portion of the end wall 11e1 in the outer cylinder portion 11a. The claw portion 7d and the claw portion 11f are engaged with each other via an annular minute gap. In this modification, an annular minute gap is formed in an uneven shape in a cross-sectional view of FIG. 3 between the claw portion 7d and the claw portion 11f, thereby forming a labyrinth structure.

[0045] The second portion 7f2 partitions the downstream air passage 10c into two spaces, i.e., a first discharge passage 10c1 for the exhaust port 10d and a second discharge passage 10c2 for the exhaust port 12b, by the above-described configuration. The first discharge passage 10c1 and the second discharge passage 10c2 are arranged side by side in the axial direction or the radial direction. In this modification, the second discharge passage 10c2 communicates with the air passage 5a of the spider 5 through a through hole 7c provided at the bottom of the main board 7f, and the first discharge passage 10c1 communicates with the air passage 4a of the rotor core 4 through a through hole 15a of the core retainer 15.

[0046] The first blade 7a1 is fixed to the surface on the side opposite to the sealed space 9 in the inclined portion of the first portion 7f1, i.e., the surface on the first discharge passage 10c1 side. A plurality of first blades 7a1 are provided on the first portion 7f1 so as to extend radially around the rotation center Ax. The first blade 7a1 can generate an air flow W1 that is introduced from the intake port 10a into the upstream air passage 10b by rotation around the rotation center Ax and is discharged from the exhaust port 10d via the air passage 4a of the rotor core 4 and the first discharge passage 10c1 in this order.

[0047] The second blade 7a2 is fixed to the surface on the side opposite to the first discharge passage 10c1 in the inclined portion of the second part 7f2, that is, on the side of the second discharge passage 10c2. A plurality of second blades 7a2 are provided in the second part 7f2 so as to extend radially about the rotation center Ax. The second blade 7a2 can generate an air flow W2 that is introduced from the intake port 10a into the upstream air passage 10b by rotation around the rotation center Ax, and is discharged from the exhaust port 12b via the air passage 5a of the spider 5 and the second discharge passage 10c2 in this order.

[0048] Thus, according to this modification, since the air flow W can be divided into a plurality of air flows W1 and W2 by the two-layer fan 7, the degree of freedom in the flow path configuration for each heat generating part in the case 10 is likely to increase, and as a result, it may be possible to more effectively suppress the temperature rise of the pair of bearings 16a and 16b, the stator 2, etc.

[0049] [Third Modification] FIG. 4 is a cross-sectional view of the totally enclosed rotating electric machine 1C of the third modification. The totally enclosed rotating electric machine 1C has the same configuration as the totally enclosed rotating electric machine 1B of the second modification. Therefore, the totally enclosed rotating electric machine 1C can obtain the same operations and effects as those of the second modification based on the same configuration.

[0050] However, in this modification, as shown in FIG. 4, the intake port 12a is provided at the radially inner end of the end wall 11e1, which is different from the second modification. The intake port 12a communicates with the second discharge passage 10c2 of the downstream air passage 10c, and can introduce outside air near the bearing 16a in the second discharge passage 10c2. The intake port 12a is an example of the second intake port.

[0051] In this modified example, the fan 7 generates an air flow W that is drawn in from two intake ports 10a and 12a and exhausted from two exhaust ports 10d and 12b by rotation around the rotation center Ax. The air flow W includes an air flow W1 that is introduced from the intake port 10a into the upstream air passage 10b, passes through the air passage 4a of the rotor core 4 and the first discharge passage 10c1 in sequence, and is discharged from the exhaust port 10d; an air flow W2 that is introduced from the intake port 10a into the upstream air passage 10b, passes through the air passage 5a of the spider 5 and the second discharge passage 10c2 in sequence, and is discharged from the exhaust port 12b; and an air flow W2 that is introduced from the intake port 12a into the second discharge passage 10c2 and is discharged from the exhaust port 12b only through the second discharge passage 10c2.

[0052] Thus, according to this modified example, by the intake port 12a, the bearing 16a can exchange heat with a cooler air flow W2 before exchanging heat with other heat-generating parts such as the bearing 16b and the rotor core 4. As a result, the temperature rise of the bearing 16a can be more effectively suppressed, and thus it is possible to suppress the cooling performance of the bearing 16a by the air flow W2 from decreasing compared with the cooling performance of the bearing 16b by the air flow W1.

[0053] [Fourth Modified Example] FIG. 5 is a cross-sectional view of the totally enclosed rotating electrical machine 1D of the fourth modified example. The totally enclosed rotating electrical machine 1D has the same configuration as the totally enclosed rotating electrical machine 1C of the third modified example above. Therefore, the totally enclosed rotating electrical machine 1D can obtain the same operations and effects as those of the third modified example based on the same configuration.

[0054] However, in this modified example, as shown in FIG. 5, the difference from the third modified example above is that the first discharge passage 10c1 communicates with the air passage 4a of the rotor core 4 and the air passage 5a of the spider 5 through a through hole 7c provided at the bottom of the main board 7f. That is, in this modified example, the second discharge passage 10c2 is configured not to communicate with the upstream air passage 10b on the bearing 16b side.

[0055] In this modification example, the fan 7 generates an air flow W that is inhaled from two intake ports 10a and 12a and discharged from two exhaust ports 10d and 12b by rotation around the rotation center Ax. The air flow W is introduced from the intake port 10a into the upstream air passage 10b, and passes through the air passage 4a of the rotor core 4, the air passage 5a of the spider 5, and the first discharge passage 10c1 in this order, and is discharged from the exhaust port 10d as an air flow W1, and is introduced from the intake port 12a into the second discharge passage 10c2 and discharged from the exhaust port 12b only through the second discharge passage 10c2 as an air flow W2. The air flow W1 is an example of a first air flow, and the air flow W2 is an example of a second air flow.

[0056] Thus, according to this modification example, since the air flow W can be split into the air flow W1 for the bearing 16b and the air flow W2 for the bearing 16a by the fan 7, the cooling performance of the pair of bearings 16a and 16b can be further enhanced by the two air flows W1 and W2.

[0057] As described above, the embodiments and modification examples of the present invention have been illustrated. However, the above embodiments and modification examples are merely examples and are not intended to limit the scope of the invention. The above embodiments and modification examples can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the gist of the invention. In addition, the specifications of each component, shape, etc. (structure, type, direction, form, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately changed and implemented.

Explanation of Reference Numerals

[0058] 1, 1A to 1D... Totally enclosed rotating electric machine, 2... Stator, 2d... Inner peripheral surface, 3... Rotor shaft, 4... Rotor core, 4a... Air passage (first air passage), 4d... Inner peripheral surface, 5... Spider, 5a... Air passage (second air passage), 5b... Cylindrical portion, 5c... Flange, 5d... Through hole, 7... Fan, 7a1... First blade, 7a2... Second blade, 7f2... Second part (partition wall), 8... Partition disk, 9... Sealed space, 10... Case, 10a... Air inlet (first air inlet), 10b... Upstream air passage, 10c... Downstream air passage, 10c1... First discharge passage, 10c2... Second discharge passage, 10d... Exhaust port (first exhaust port), 11... Frame, 11e1... End wall (first end wall), 11e2... End wall (second end wall), 12a... Air inlet (second air inlet), 12b... Exhaust port (second exhaust port), 16a, 16b... Bearings, Ax... Rotation center, R... Radial direction, W... Air flow, W1... First air flow, W2... Second air flow, X... Axial direction.

Claims

【Claim 1】 A case having a cylindrical frame, a first end wall covering one axial end of the frame, and a second end wall covering the other axial end of the frame; A stator fixed to the inner peripheral surface of the frame; A rotor core disposed opposite to the inner peripheral surface of the stator and provided with a first air passage penetrating in the axial direction; A spider fixed to the inner peripheral surface of the rotor core, provided with a second air passage penetrating in the axial direction, and extending in the axial direction more than the rotor core; A rotor shaft fixed to the inner peripheral portion of the spider and rotatably supported by the first end wall and the second end wall via a pair of bearings provided at both axial ends; A partition disk fixed to the outer peripheral surface of the rotor shaft, extending from the rotor core toward the second end wall, partitioning a sealed space in which the stator is accommodated in the case and an upstream air passage leading from the first air passage and the second air passage to the radially inner end of the second end wall inside the radially inner side of the stator than the sealed space; A fan fixed to the outer peripheral surface of the rotor shaft, extending from the rotor core toward the first end wall, partitioning the inside of the case into the sealed space and a downstream air passage leading from the first air passage and the second air passage toward the first end wall side inside the radially inner side of the sealed space, and generating an air flow from the upstream air passage through the first air passage and the second air passage toward the downstream air passage side by rotating integrally with the rotor shaft; Comprising: A second intake port is provided at the radially inner end of the first end wall; The downstream air passage extends radially outward on one axial end side from the sealed space; The frame is provided with a first exhaust port communicating with the second intake port and the first intake port through the downstream air passage; A second exhaust port is provided at the radially outer end of the first end wall; The fan has a first blade that generates a first air flow sucked from the first intake port and exhausted from the first exhaust port, a second blade that generates a second air flow sucked from the second intake port and exhausted from the second exhaust port, and a partition plate that partitions the first air flow and the second air flow; A totally enclosed rotating electrical machine.

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