Rotating Electric Machine

Abstract

To provide a rotary electric machine in which a rotor is provided with a coil and which can prevent cooling oil from jetting out from a housing.SOLUTION: A rotary electric machine 100 includes: a rotor coil 32 wound around a rotor 3; ejection holes 11f and 12c provided in a housing 1 and ejecting oil toward a rotor coil 32; a breathing hole 13a provided above the rotor 3 and communicating the inside and the outside of the housing 1; and a wall portion 7 that is provided in the housing 1 so as to be positioned between the rotor 3 and the breathing hole 13a in a radial direction of the rotor 3, and prevents the oil scattered with the rotation of the rotor 3 from entering the breathing hole 13a.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] Patent document 1 discloses an electric motor having a stator provided in a housing, a rotor rotatably attached to the housing and having a core portion formed at the center of rotation, and a plurality of teeth extending radially from the core portion, a stator winding attached to the stator so as to face the rotor in the radial direction, and a rotor winding wound in multiple layers radially around the teeth of the rotor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-45956 A Summary of the Invention [Problem to be solved by the invention]

[0004] The electric motor described in Patent Document 1 does not disclose any measures against heat generation in the stator winding or rotor winding. Generally, the stator winding is cooled by pouring oil over it, and it is conceivable to apply such measures to the electric motor described in Patent Document 1 as well.

[0005] However, in the electric motor described in Patent Document 1, when oil is poured onto the rotor windings provided on the rotor, the rotor windings rotate together with the rotor, and the oil may be splashed forcefully inside the housing, which may cause the oil to spurt out from a communication passage (breathing hole) with the outside provided in the housing.

[0006] The present invention has been made in consideration of such technical problems, and aims to provide a rotating electric machine having a coil on a rotor, which can prevent cooling oil from spraying out of the housing to the outside. [Means for solving the problem]

[0007] In one aspect of the present invention, a rotating electric machine comprises a housing, a stator accommodated in the housing, a stator coil wound around the stator, a shaft rotatably supported in the housing, a rotor attached to the shaft and supported in the stator, a rotor coil wound around the rotor, a nozzle provided in the housing for spraying oil toward the rotor coil exposed from the side of the rotor in the direction of the rotational axis of the shaft, a ventilation hole provided above the rotor and connecting the inside and outside of the housing, and a wall provided in the housing so as to be positioned between the rotor and the ventilation hole in the radial direction of the rotor, and which prevents oil scattered as the rotor rotates from entering the ventilation hole. Effect of the Invention

[0008] In the present invention, a wall portion is provided so as to be located between the rotor and the ventilation hole in the radial direction of the rotor. As a result, even if oil cooling the rotor coil is scattered as the rotor rotates, the oil hits the wall portion and is prevented from entering the ventilation hole, thereby preventing the oil from spraying out to the outside. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic cross-sectional view of a rotating electric machine. [Diagram 2] FIG. 2 is a perspective view of the rotating electric machine. [Diagram 3] FIG. 3 is a front view of the rotating electric machine. [Figure 4] FIG. 4 is a rear view of the second cover. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] Fig. 1 is a schematic cross-sectional view of the rotating electric machine 100. Fig. 2 is a perspective view of the rotating electric machine 100. Fig. 3 is a front view of the rotating electric machine 100. The rotating electric machine 100 is a motor, a generator, or a motor-generator that operates as both a motor and a generator, and is a field winding type synchronous machine.

[0012] 1, the rotating electric machine 100 includes a housing 1, a stator 2 accommodated in the housing 1, a shaft 4 rotatably supported by the housing 1, and a rotor 3 attached to the shaft 4 and supported within the stator 2. In this embodiment, the up-down direction in the drawing is the top-to-bottom direction, and in the following description, the top-to-bottom direction will be referred to as the up-to-down direction. Also, the direction of the rotation axis of the rotor 3 and the shaft 4 will be simply referred to as the rotation axis direction or the axial direction, and the radial direction of the rotor 3 will be simply referred to as the radial direction.

[0013] As shown in Figures 1 to 3, the housing 1 comprises a cylindrical accommodating portion 11 having a space formed therein for accommodating the stator 2 and the rotor 3, and a first cover 12 serving as a first cover portion for covering an opening 11a on one end side of the accommodating portion 11.

[0014] 1, the housing portion 11 is formed in a cylindrical shape with a bottom. A through hole 11c through which the shaft 4 passes is provided in a bottom 11b of the housing portion 11. In addition, a tank portion 11d that stores oil for cooling the stator 2 and the rotor 3 is provided below the housing portion 11.

[0015] 1 to 3, the first cover 12 is fixed to the housing portion 11 by bolts or the like so as to cover an opening 11a of the housing portion 11. As shown in Fig. 1, the first cover 12 has a through hole 12a through which wires connected to a stator coil 22 and a rotor coil 32, which will be described later, are inserted, and a through hole 12b through which the shaft 4 is inserted. A bearing 5a that rotatably supports the shaft 4 is provided in the through hole 12b.

[0016] The housing 1 further includes a second cover 13 as a second cover portion that covers the through hole 12a provided in the first cover 12, and a third cover 14 that covers the through hole 12b provided in the first cover 12.

[0017] As shown in Figures 2 and 3, the second cover 13 and the third cover 14 are fixed to the outer surface of the first cover 12 by bolts. The second cover 13 is provided with a ventilation hole 13a (see Figures 1 and 4) that communicates between the inside and outside of the housing 1, and a through hole 13b (see Figures 2 to 4) through which wiring (cables) connected to the stator coil 22 and the rotor coil 32 are inserted. In addition, the second cover 13 is provided with a pipe 15 that is attached to the outer side of the ventilation hole 13a and extends upward. Although not shown, a seal member is provided between the through hole 13b and the cable, and the gap between them is sealed by the seal member.

[0018] The stator 2 has a stator core 21 and a stator coil 22. The stator core 21 is formed in a cylindrical shape, and a plurality of teeth (not shown) formed to protrude radially inward are provided on the inner circumferential surface of the stator core 21. Three-phase (U-phase, V-phase, W-phase) stator coils 22 are wound around the teeth. The stator coils 22 are wound around the teeth by concentrated winding or distributed winding.

[0019] The rotor 3 has a rotor core 31 and a rotor coil 32 as a field winding. A plurality of teeth (not shown) formed to protrude radially outward are provided on the outer peripheral surface of the rotor core 31. A single-phase winding is wound around the teeth of the rotor core 31. The rotor 3 is attached to the shaft 4, and is supported within the stator 2 with a predetermined gap provided between the rotor 3 and the inner peripheral surface of the stator 2.

[0020] The shaft 4 is rotatably supported in the housing 1 by bearings 5a and 5b formed of ball bearings. One end of the shaft 4 passes through a through hole 11c of the accommodation portion 11 and protrudes to the outside, and is connected to a driving wheel (not shown) via a worm reduction mechanism (not shown) or to an engine (not shown) via a speed increasing mechanism (not shown).

[0021] The rotating electric machine 100 further includes a collar member 6 attached to the rotor 3 and having a peripheral wall portion 6a that radially covers the rotor coil 32 exposed from the side surfaces 3a, 3b of the rotor 3 in the rotational axis direction, and a cooling mechanism C that cools the stator coil 22 and the rotor coil 32.

[0022] The collar member 6 is formed in a substantially cylindrical shape, and is fixed to the outer edge portion of the rotor core 31, at both axial ends of the rotor core 31. As a result, the collar member 6 rotates integrally with the rotor 3.

[0023] The collar member 6 is provided with a vertical wall portion 6b extending radially inward from one end of a cylindrical peripheral wall portion 6a, and a plurality of communication holes 6c formed to penetrate the peripheral wall portion 6a in the radial direction. The communication holes 6c are provided at positions facing the coil end portions 22a of the stator coil 22 at predetermined intervals in the circumferential direction.

[0024] The cooling mechanism C includes a pump P, an ejection hole 11e provided in an upper portion of the housing portion 11 and ejecting oil supplied from the pump P, an ejection hole 11f provided in a bottom portion 11b of the housing portion 11 and ejecting oil toward a rotor coil 32 exposed from one side surface 3a of the rotor 3 in the axial direction of the shaft 4, and an ejection hole 12c provided in the first cover 12 and ejecting oil toward a rotor coil 32 exposed from the other side surface 3b of the rotor 3 in the axial direction of the shaft 4. The pump P and the ejection holes 11e, 11f, and 12c are connected by flow paths provided in the housing portion 11 and the first cover 12. The pump P is operated when the stator coil 22 and the rotor coil 32 are energized and the rotor 3 is rotating.

[0025] The ejection hole 11e is provided at the top of the inner peripheral surface of the housing portion 11 so as to face the vicinity of the center in the axial direction of the stator 2. In the embodiment shown in FIG. 1, a case where one ejection hole 11e is provided is described as an example, but a plurality of ejection holes 11e may be provided in the axial or circumferential direction. The oil ejected from the ejection hole 11e cools the stator core 21 and the stator coil 22 while flowing down along the outer periphery of the stator 2. The oil that flows down along the outer periphery of the stator 2 is returned to the tank portion 11d.

[0026] The ejection hole 11f ejects oil toward the rotor coil 32 located on the upper side among the rotor coils 32 exposed from one side surface 3a of the rotor 3. The ejection hole 12c ejects oil toward the rotor coil 32 located on the upper side among the rotor coils 32 exposed from the other side surface 3b of the rotor 3.

[0027] As described above, the pump P operates when the rotor 3 is rotating. When the rotor 3 rotates, the rotor coil 32 also rotates, so that the oil ejected from the ejection holes 11f and 12c is sequentially applied to the rotor coils 32 arranged in the circumferential direction. This makes it possible to cool all of the rotor coils 32 arranged in the circumferential direction.

[0028] Most of the oil ejected from the ejection holes 11f and 12c is blown outward in the radial direction by centrifugal force. The blown oil is captured by the peripheral wall portion 6a of the collar member 6. The oil captured by the peripheral wall portion 6a passes through the communication hole 6c and is blown out of the collar member 6 by centrifugal force.

[0029] 1, in this embodiment, the coil end portion 22a of the stator coil 22 is provided at a position facing the communication hole 6c in the rotation axis direction. As a result, the oil ejected from the communication hole 6c is sprayed onto the coil end portion 22a of the stator coil 22.

[0030] In this way, the oil ejected from the ejection holes 11f and 12c cools the rotor coil 32, and then is guided by the collar member 6 to the coil end portion 22a of the stator coil 22, thereby cooling the coil end portion 22a of the stator coil 22. The oil that has cooled the coil end portion 22a of the stator coil 22 falls by gravity and is returned to the tank portion 11d.

[0031] In the rotating electric machine 100 configured in this manner, when the rotor 3 rotates at high speed, a strong centrifugal force acts on the oil applied to the rotor coil 32, etc. When a strong centrifugal force acts on the oil, the oil scatters over a wide area inside the housing 1. At this time, some of the scattered oil may enter the pipe 15 through the through hole 12a of the first cover 12 and the ventilation hole 13a of the second cover 13, and the oil may be discharged to the outside of the housing 1.

[0032] 3 and 4, in the rotating electric machine 100 of this embodiment, the second cover 13 is provided with a wall portion 7 that prevents oil scattered with the rotation of the rotor 3 from entering the ventilation hole 13a. The specific configurations of the ventilation hole 13a and the wall portion 7 will be described below. Note that Fig. 4 is a view (rear view) of the second cover 13 as seen from the inside.

[0033] In the rotating electric machine 100 of this embodiment, as shown in Fig. 3, when the normal rotation direction of the rotor 3 is clockwise as viewed from the direction of the rotation axis (see the arrow), the ventilation hole 13a is provided in a region (region R) above the rotor 3 and to the right of the rotation axis O. Note that the normal rotation direction here refers to the rotation direction in which the rotating electric machine 100 is normally used (the rotation direction that occupies most of the operating time). Specifically, for example, when the rotating electric machine 100 is used as a drive motor for a vehicle, it is the direction in which the rotor 3 rotates when the vehicle is moved forward.

[0034] As shown in Fig. 3, in the region to the right of the rotation axis O, the rotation direction of the rotor 3 is downward, so the amount of oil scattering upward is less than in the region to the left of the rotation axis O. Also, because gravity acts on the oil, the amount of oil scattering in the region above the rotor 3 is less than in the region below the rotor 3. Therefore, in the region above the rotor 3 and to the right of the rotation axis O (region R), the amount of oil that is stirred up and scattered by the rotation of the rotor 3 is less than in other regions. Therefore, by providing the ventilation hole 13a in such region R, the amount of oil that enters the ventilation hole 13a can be reduced.

[0035] 3 and 4, in this embodiment, the wall 7 is provided so as to surround the ventilation hole 13a. To explain the wall 7 in detail, the wall 7 has a first wall 7a provided so as to be located between the rotor 3 and the ventilation hole 13a in the radial direction of the rotor 3, a second wall 7b provided so as to face the first wall 7a across the ventilation hole 13a in the radial direction of the rotor 3, and a third wall 7c connecting the ends of the first wall 7a and the second wall 7b on the rotation axis O side. That is, the wall 7 is formed in a substantially U-shape having an opening 7d in a direction away from the rotation axis O. By forming the wall 7 in this shape, even if oil flies from the direction shown by the dotted arrow in FIG. 3 as the rotor 3 rotates, the oil hits the wall 7, thereby preventing the oil from entering the ventilation hole 13a.

[0036] In this embodiment, the first wall portion 7a and the second wall portion 7b are formed so as to be inclined downwards in a direction away from the rotation axis O, in other words, toward the opening portion 7d. As a result, even if oil enters the wall portion 7, the oil can flow down the first wall portion 7a and the second wall portion 7b by gravity and be discharged from the opening portion 7d. In other words, by adopting such a shape, it is possible to prevent oil from accumulating in the wall portion 7.

[0037] The configuration, operation, and effects of the embodiment of the present invention configured as above will be described below.

[0038] The rotating electric machine 100 comprises a housing 1, a stator 2 accommodated in the housing 1, a stator coil 22 wound around the stator 2, a shaft 4 rotatably supported in the housing 1, a rotor 3 attached to the shaft 4 and supported in the stator 2, a rotor coil 32 wound around the rotor 3, ejection holes 11f, 12c provided in the housing 1 for ejecting oil toward the rotor coil 32 exposed from side surfaces 3a, 3b of the rotor 3 in the direction of the rotational axis of the shaft 4, a ventilation hole 13a provided above the rotor 3 and communicating between the inside and outside of the housing 1, and a wall portion 7 provided in the housing 1 so as to be positioned between the rotor 3 and the ventilation hole 13a in the radial direction of the rotor 3, and which prevents oil scattered as the rotor 3 rotates from entering the ventilation hole 13a.

[0039] In this configuration, the wall portion 7 is provided so as to be located between the rotor 3 and the ventilation hole 13a in the radial direction of the rotor 3. As a result, even if oil cooling the rotor coil 32 is scattered as the rotor 3 rotates, the oil hits the wall portion 7 and is prevented from entering the ventilation hole 13a. This makes it possible to prevent the oil from spraying out to the outside.

[0040] The rotating electric machine 100 further includes a collar member 6 that is attached to the rotor 3 and has a peripheral wall portion 6a that radially covers the rotor coil 32 exposed from the side surfaces 3a, 3b of the rotor 3 in the rotation axis direction, and a plurality of communication holes 6c formed so as to penetrate the peripheral wall portion 6a in the radial direction. In addition, the coil end portion 22a of the stator coil 22 is provided at a position facing the communication holes 6c in the radial direction.

[0041] In this configuration, the coil end portion 22a of the stator coil 22 is provided at a position facing the communication hole 6c in the radial direction, so that the oil ejected from the communication hole 6c is sprayed onto the coil end portion 22a of the stator coil 22. This allows the oil ejected from the ejection holes 11f and 12c to cool the rotor coil 32 and then cool the stator coil 22. Furthermore, the oil ejected from the communication hole 6c hits the coil end portion 22a of the stator coil 22, thereby preventing the oil from scattering toward the ventilation hole 13a, etc.

[0042] In the rotating electric machine 100, the housing 1 has a cylindrical accommodating section 11 that accommodates the stator 2 and the rotor 3, a first cover 12 (first cover portion) that covers the opening 11a of the accommodating section 11, and a second cover 13 (second cover portion) that covers the through hole 12a of the first cover 12 (first cover portion) and has a ventilation hole 13a and a wall portion 7.

[0043] In this configuration, since the wall portion 7 is provided on the second cover 13 (second cover portion), it is possible to easily form the wall portion 7. Moreover, the second cover 13 (second cover portion) can be easily added to an existing rotating electric machine.

[0044] The rotating electric machine 100 further includes a pipe 15 that is attached to the outer side of the ventilation hole 13a and extends upward.

[0045] In this configuration, since the pipe 15 extending upward is provided, it is possible to prevent oil from spurting out from inside the housing 1 to the outside.

[0046] In the rotating electric machine 100, when viewed from the direction of the rotation axis, when the rotation direction of the rotor 3 is clockwise, the ventilation hole 13a is provided in an area (area R) above the rotor 3 and to the right of the rotation axis O of the shaft 4.

[0047] Compared to other regions, the region (region R) above the rotor 3 and to the right of the rotation axis O receives a relatively small amount of oil that is stirred up and scattered by the rotation of the rotor 3. Therefore, by providing the ventilation hole 13a in such region R, the amount of oil that enters the ventilation hole 13a can be reduced.

[0048] In the rotating electric machine 100, the wall portion 7 has a first wall portion 7a arranged to be located between the rotor 3 and the ventilation hole 13a in the radial direction of the rotor 3, a second wall portion 7b arranged to face the first wall portion 7a across the ventilation hole 13a in the radial direction of the rotor 3, and a third wall portion 7c connecting the rotating shaft side ends of the first wall portion 7a and the second wall portion 7b.

[0049] In this configuration, even if oil flies as the rotor 3 rotates, the oil hits the wall portion 7, thereby preventing the oil from entering the ventilation hole 13a.

[0050] In the rotating electric machine 100, the first wall portion 7a is formed so as to be inclined downward in a direction away from the rotation axis O.

[0051] In this configuration, even if oil enters the wall portion 7, the oil is discharged from the first wall portion 7a by gravity. This makes it possible to prevent oil from accumulating within the wall portion 7.

[0052] Although the embodiments of the present invention have been described above, the configurations described in the above embodiments and the respective modified examples merely represent some of the application examples of the present invention and are not intended to limit the technical scope of the present invention.

[0053] In the above embodiment, the wall portion 7 is provided on the second cover 13, but the wall portion 7 may be provided on the first cover 12. In addition, the wall portion 7 does not necessarily have to be U-shaped, and may be provided, for example, only with the first wall portion 7a and the third wall portion 7c, as long as the wall portion 7 is provided at a location between the rotor 3 and the breathing hole 13a in the radial direction of the rotor 3.

[0054] Furthermore, the first cover 12, the second cover 13, the third cover 14, and the storage section 11 may be appropriately integrated in any of these combinations.

[0055] In the above embodiment, the rotating electrical machine 100 is described with the collar member 6 provided as an example, but the collar member 6 does not necessarily have to be provided.

[0056] In addition, in the above embodiment, an example was described in which the ventilation hole 13a is provided in the area above the rotation axis O and on the right side (area R), but the ventilation hole 13a only needs to be provided at least above the rotor 3. [Explanation of symbols]

[0057] 100 rotating electric machine, 1 housing, 2 stator, 3 rotor, 3a side surface, 3b side surface, 4 shaft, 6 collar member, 6a peripheral wall portion, 6b standing wall portion, 6c communication hole, 7 wall portion, 7a first wall portion, 7b second wall portion, 7c third wall portion, 7d opening portion, 11 collection container portion, 11e... nozzle, 11f... nozzle, 12... first cover (first cover portion), 12c... nozzle, 13... second cover (second cover portion), 13a... ventilation hole, 15... pipe, 21... stator core, 22... stator coil, 22a... coil end portion, 31... rotor core, 32... rotor coil

Claims

1. A rotating electric machine, Housing and A stator accommodated within the housing; A stator coil wound around the stator; a shaft rotatably supported in the housing; a rotor attached to the shaft and supported within the stator; A rotor coil wound around the rotor; an oil ejection hole provided in the housing and exposed from a side surface of the rotor in a rotation axis direction of the shaft, the oil ejection hole being configured to eject oil toward the rotor coil; a ventilation hole provided above the rotor and communicating between the inside and the outside of the housing; a wall portion provided in the housing so as to be positioned between the rotor and the ventilation hole in the radial direction of the rotor, the wall portion preventing oil scattered as the rotor rotates from entering the ventilation hole.

2. 2. A rotating electric machine according to claim 1, a collar member attached to the rotor, the collar member having a peripheral wall portion that radially covers the rotor coil exposed from a side surface of the rotor in the rotation axis direction, and a plurality of communication holes formed to penetrate the peripheral wall portion in the radial direction, A rotating electric machine, wherein a coil end portion of the stator coil is provided at a position facing the communication hole in the direction of the rotation axis.

3. A rotating electric machine according to claim 1 or 2, The housing includes: a cylindrical housing portion that houses the stator and the rotor; A first cover portion that covers an opening of the storage portion; a second cover portion covering the through hole of the first cover portion and having the ventilation hole and the wall portion provided therein.

4. A rotating electric machine according to any one of claims 1 to 3, The rotating electric machine further comprises a pipe attached to an outer side of the ventilation hole and extending upward.

5. A rotating electric machine according to any one of claims 1 to 4, The rotor is clockwise when viewed from a predetermined direction, The ventilation hole is provided in a region above the rotor and to the right of a rotation axis of the shaft when viewed from the predetermined direction.

6. A rotating electric machine according to claim 5, The wall portion is a first wall portion provided so as to be located between the rotor and the ventilation hole in a radial direction of the rotor; a second wall portion provided to face the first wall portion across the ventilation hole in a radial direction of the rotor; a third wall portion connecting ends of the first wall portion and the second wall portion on the rotating shaft side.

7. A rotating electric machine according to claim 6, The first wall portion is formed so as to slope downward as it moves away from upper and lower planes passing through the rotation shaft.

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