Rotating electric machine

Abstract

This design aims to keep the cost of rotating electrical machinery down while enabling effective cooling of the coil ends of the stator coils. [Solution] The rotating electric machine of the present disclosure includes a plurality of refrigerant passages opening at one end face and the other end face of the stator core, a cylindrical portion surrounding one coil end of the stator coil, and a plurality of refrigerant holes formed at circumferential intervals in the cylindrical portion, and a refrigerant guide member that guides refrigerant from a refrigerant supply portion formed in the case to one coil end and the stator core side, a first seal member that seals the space between one end of the refrigerant guide member and the case, and a plurality of holes formed at circumferential intervals so as to communicate with the openings at one end face of the stator core of the corresponding refrigerant passages, and a second seal member that seals the space between one end face of the stator core and the other end of the refrigerant guide member, and seals the space between one end face of the stator core and the case.

Description

Technical Field

[0001] The present disclosure relates to a rotating electric machine including a case, an annular stator disposed within the case, and a rotor rotatably disposed within the stator.

Background Art

[0002] Conventionally, a starter for a rotating electric machine including a support member that supports a stator core on the radially outer side of the stator core is known (see, for example, Patent Document 1). Such a support member for the stator includes an annular oil passage forming portion and an annular outer peripheral support portion. The oil passage forming portion includes a first oil passage forming portion and a second oil passage forming portion spaced apart in the axial direction, and a circumferential oil passage extending over the entire circumference in the circumferential direction between the two, and is integrally joined to the outer peripheral surface of the stator core. The first and second oil passage forming portions have an axially extending oil passage that extends linearly or is formed by a connection of a large number of holes. The outer peripheral support portion includes a recess that forms an oil introduction passage, and a barrel portion that projects radially inward so as to fill a notch formed in the first oil passage forming portion or the like and extends in the axial direction. The outer peripheral support portion is integrally joined to the outer peripheral surface of the oil passage forming portion. The oil introduced into the introduction passage of the outer peripheral support portion flows in the circumferential direction along the circumferential oil passage, and a part of the oil flowing in the circumferential direction is captured by the barrel portion and flows into the axially extending oil passage of the first oil passage forming portion or the like. The oil in the axially extending oil passage flows out from the opening of the axially extending oil passage and drips onto the coil end portion of the stator coil. Thereby, it becomes possible to cool the coil end portion with oil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0005] Therefore, the main objective of this disclosure is to enable good cooling of the coil end portion of the stator coil while suppressing the cost increase of the rotating electric machine. [Means for solving the problem]

[0006] The rotating electric machine of this disclosure includes a case, an annular stator disposed within the case, a rotor rotatably disposed within the stator, a plurality of refrigerant passages, a refrigerant guide member, a first seal member, and a second seal member. The plurality of refrigerant passages are formed circumferentially spaced in the stator core so as to extend from one end face to the other end face of the stator core. Each of the plurality of refrigerant passages opens at one end face and the other end face of the stator core. The refrigerant guide member includes a cylindrical portion that surrounds one coil end of a stator coil wound around the stator core, and a plurality of refrigerant holes formed circumferentially spaced in the cylindrical portion. The refrigerant guide member guides refrigerant from a refrigerant supply portion formed in the case to the one coil end and the stator core. The first seal member seals the space between the end of the refrigerant guide member opposite to the stator core and the case. The second sealing member includes a plurality of holes formed at intervals in the circumferential direction, each hole communicating with an opening at one end face of the stator core of the corresponding refrigerant passage. The second sealing member seals the space between one end face of the stator core and the other end of the refrigerant guide member on the stator core side, as well as the space between one end face of the stator core and the case.

[0007] In this rotating electric machine, a portion of the refrigerant from the refrigerant supply unit is guided to one coil end through multiple refrigerant holes in the refrigerant guide member. Another portion of the refrigerant from the supply unit is guided to the stator core by the refrigerant guide member and flows into each refrigerant passage through multiple holes in the second seal member and an opening on one end face of the stator core. The refrigerant flowing into each refrigerant passage flows out through an opening on the other end face of the stator core and is supplied to the other coil end of the stator coil. Furthermore, the space between one end of the refrigerant guide member and the case is sealed by the first seal member, and both the space between the stator core and the other end of the refrigerant guide member, and the space between the stator core and the case are sealed by the second seal member. This effectively suppresses the flow of refrigerant from the supply unit between one end of the refrigerant guide member and the case, between the stator core and the other end of the refrigerant guide member, and between the stator core and the case, enabling a sufficient supply of refrigerant to both coil ends of the stator coil. In addition, by sealing both the space between the stator core and the other end of the refrigerant guide member, and the space between the stator core and the case, the increase in the number of parts of the rotating electric machine can be suppressed. As a result, it becomes possible to cool the coil ends of the stator coils effectively while keeping the cost of the rotating electric machine down. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram illustrating the rotating electric machine of this disclosure. [Figure 2] This is a plan view showing a plate member that forms the stator core of the rotating electric machine of the present disclosure. [Figure 3] This is a plan view showing other plate members forming the stator core of the rotating electric machine of the present disclosure. [Figure 4] This is a plan view showing yet another plate member forming the stator core of the rotating electric machine of the present disclosure. [Figure 5] This is a perspective view showing a refrigerant guide member of a rotating electric machine in this disclosure. [Figure 6] This is a cross-sectional view showing the main part of the rotating electric machine disclosed herein. [Modes for carrying out the invention]

[0009] Next, with reference to the drawings, embodiments for carrying out the invention of this disclosure will be described.

[0010] Figure 1 is a schematic diagram showing a rotating electric machine 1 of the present disclosure. The rotating electric machine 1 shown in the figure is a three-phase AC motor used, for example, as a driving source or generator for electric vehicles (BEVs), fuel cell vehicles (FCVs), or hybrid vehicles (PHEVs, HEVs). As shown in the figure, the rotating electric machine 1 includes a case 2, an annular stator 3, and a rotor 4 rotatably arranged within the stator 3. The case 2 includes a cylindrical case body 20 and a cover 25 fixed to the case body 20 via a plurality of bolts (not shown) so as to close the open end (left end in Figure 1) of the case body 20. The case body 20 and the cover 25 are made of a metal such as an aluminum alloy.

[0011] The stator 3 of the rotating electric machine 1 includes a stator core 30 and three phase (three) stator coils CU, CV, and CW wound around the stator core 30. The stator core 30 is formed by stacking multiple electromagnetic steel sheets 31, 32, and 33, as shown in Figures 2, 3, and 4, and connecting them in the stacking direction by crimping. However, the stator core 30 may also be formed in an annular shape by, for example, pressure molding and sintering ferromagnetic powder.

[0012] As shown in Figure 2, the electromagnetic steel sheet 31 includes a central hole 310, a plurality of protrusions 311, a plurality of (for example, 48 in this embodiment) notches 312, a plurality of (for example, 3 in this embodiment) bolt holes 314, and a plurality of (for example, 48 in this embodiment) holes 315. The plurality of protrusions 311 extend radially from the annular outer circumference of the electromagnetic steel sheet 31 toward the central hole 310 (axis) and are adjacent to each other at predetermined intervals in the circumferential direction. The plurality of notches 312 each extend radially between adjacent protrusions 311 and are arranged circumferentially at predetermined intervals, opening at the central hole 310. The plurality of bolt holes 314 are formed on the outer circumference of the electromagnetic steel sheet 31 at circumferential intervals (for example, at equal intervals). The multiple holes 315 are formed circumferentially at intervals (equally spaced) so as to be close to the outer circumference of the electromagnetic steel sheet 31, on the radially outer side of the base end of each protrusion 311.

[0013] As shown in Figure 3, the electromagnetic steel sheet 32 ​​includes a central hole 320, a plurality of protrusions 321, a plurality of (for example, 48 in this embodiment) notches 322, a plurality of (for example, 3 in this embodiment) bolt holes 324, and a plurality of (for example, 48 in this embodiment) slits 325. The plurality of protrusions 321 extend radially from the annular outer circumference of the electromagnetic steel sheet 32 ​​toward the central hole 320 (axis) and are adjacent to each other at predetermined intervals in the circumferential direction. The plurality of notches 322 each extend radially between adjacent protrusions 321 and are arranged circumferentially at predetermined intervals, opening at the central hole 320. The plurality of bolt holes 324 are formed on the outer circumference of the electromagnetic steel sheet 32 ​​at circumferential intervals (for example, at equal intervals). Multiple slits 325 are formed at circumferential intervals (equally spaced) so as to extend from the base end of each protrusion 321 to the vicinity of the outer circumference of the electromagnetic steel sheet 32 ​​and communicate with the holes 315 in the electromagnetic steel sheet 31.

[0014] As shown in Figure 4, the electromagnetic steel sheet 33 includes a central hole 330, a plurality of protrusions 331, a plurality of (for example, 48 in this embodiment) notches 332, a plurality of (for example, 3 in this embodiment) bolt holes 334, and a plurality of (for example, 48 in this embodiment) holes 335. The plurality of protrusions 331 extend radially from the annular outer circumference of the electromagnetic steel sheet 33 toward the central hole 330 (axis) and are adjacent to each other at predetermined intervals in the circumferential direction. The plurality of notches 332 each extend radially between adjacent protrusions 331 and are arranged circumferentially at predetermined intervals, opening at the central hole 330. The plurality of bolt holes 334 are formed on the outer circumference of the electromagnetic steel sheet 33 at circumferential intervals (for example, at equal intervals). Multiple holes 335 are formed at circumferential intervals (equally spaced) so as to communicate with the inner end of the slit 325 of the electromagnetic steel sheet 32 ​​near the base end of each protrusion 331.

[0015] In this embodiment, a relatively small number of electromagnetic steel sheets 31 are laminated to form the lead-side end of the stator core 30. In addition, a large number of electromagnetic steel sheets 33 are laminated to form the majority of the stator core 30 and the non-lead-side end. Furthermore, a plurality of electromagnetic steel sheets 32 are laminated between the plurality of electromagnetic steel sheets 31 and the plurality of electromagnetic steel sheets 33. When the plurality of electromagnetic steel sheets 31, 32, and 33 are connected, the plurality of protrusions 311, 321, and 331 overlap to form the plurality of teeth portions of the stator core 30, and the plurality of notches 312, 322, and 332 overlap to form the plurality of slots of the stator core 30.

[0016] Furthermore, the stator core 30 has multiple bolt holes extending axially, formed by the communication of bolt holes 314, 324, and 334 in the electromagnetic steel sheets 31, 32, and 33. In addition, the stator core 30 has multiple (for example, 48 in this embodiment) refrigerant passages 35 spaced apart in the circumferential direction, formed by the communication of holes 315 in the electromagnetic steel sheet 31, slits 325 in the electromagnetic steel sheet 32, and holes 335 in the electromagnetic steel sheet 33. Each refrigerant passage 35 extends from one end face 30a on the lead side of the stator core 30 (the right end face in Figure 1) to the other end face 30b on the non-lead side (the left end face in Figure 1), and opens at both the one end face 30a and the other end face 30b.

[0017] The stator coils CU, CV, and CW of the stator 3 are each formed by electrically joining multiple segment coils (coil wires) (not shown), and are connected to each other, for example, by a star connection (Y connection). The segment coils are electrical conductors formed by bending a flat rectangular wire, which has an insulating coating made of, for example, enamel resin, onto its surface, into a roughly U-shape, and have a pair (two) of legs. The two legs of each segment coil are inserted into different slots of the stator core 30, and the legs of each segment coil that protrude from one end face 30a of the stator core 30 are bent.

[0018] After the bending process is complete, the tip of each segment coil is electrically joined by welding to the tip of a corresponding segment coil adjacent to it in the radial direction of the stator core 30. As a result, multiple stator coils CU, CV, and CW are wound around the stator core 30. Furthermore, the annular coil end portions Ea of the stator coils CU, CV, and CW protrude from one end face 30a of the stator core 30, and the annular coil end portions Eb of the stator coils CU, CV, and CW protrude from the other end face 30b of the stator core 30.

[0019] The rotor 4 of the rotating electric machine 1 is a so-called embedded magnet type (IPM type) rotor. As shown in FIG. 1, the rotor 4 includes a rotor shaft 40, a rotor core 41 fixed to the rotor shaft 40, and a plurality of permanent magnets (not shown) embedded in the rotor core 41 so as to form a plurality of magnetic poles (in this embodiment, for example, 8 poles). The rotor 4 is disposed in the case 2 so that the rotor core 41 can rotate freely within the stator 3 via an air gap. Further, the rotor shaft 40 is rotatably supported by a plurality of bearings (not shown) held by the case 2.

[0020] Furthermore, as shown in FIG. 1, the rotating electric machine 1 includes a refrigerant guide member 50. The refrigerant guide member 50 is formed of resin or the like, and as shown in FIG. 5, includes an annular cylindrical portion 51, an annular side plate portion 52, and an annular flange portion 53. The cylindrical portion 51 has an inner diameter larger than the outer diameter of one coil end portion Ea of the stator coils CU, CV, CW, an outer diameter smaller than the outer diameter of the stator core 30, and an axial length longer than the protruding length (axial length) of the coil end portion Ea from one end face 30a of the stator core 30. Further, a plurality of refrigerant holes (through holes) 51o are formed in the cylindrical portion 51 at intervals in the circumferential direction.

[0021] The side plate portion 52 of the refrigerant guide member 50 extends radially inward and radially outward from one end portion (the right end portion in FIG. 5) of the cylindrical portion 51. In this embodiment, the side plate portion 52 has an inner diameter slightly larger than the inner diameter of the stator core 30 and an outer diameter slightly larger than the outer diameter of the cylindrical portion 51. Further, a plurality of refrigerant discharge holes 52o are formed in the lower portion of the side plate portion 52. The flange portion 53 extends radially outward from the other end portion (the left end portion in FIG. 5) of the cylindrical portion 51. In this embodiment, the flange portion 53 has an outer diameter slightly smaller than the outer diameter of the side plate portion 52.

[0022] As shown in Figure 5, an annular first gasket (first sealing member) 61 is attached to the outer circumference of the side plate portion 52 of the refrigerant guide member 50. In this embodiment, the first gasket 61 is made of, for example, acrylic rubber material and has an outer diameter that is approximately the same as the outer diameter of the side plate portion 52. The first gasket 61 includes a plurality of holes into which corresponding projections formed in the side plate portion 52 are press-fitted, and is attached to the outer circumference of the side plate portion 52 so as to protrude on the side opposite to the cylindrical portion 51 side of the side plate portion 52.

[0023] Furthermore, an annular second gasket (second sealing member) 62 is attached to the flange portion 53 of the refrigerant guide member 50. In this embodiment, the second gasket 62 is made of, for example, acrylic rubber, and has an inner diameter that is approximately the same as the inner diameter of the cylindrical portion 51 and an outer diameter that is approximately the same as the outer diameter of the stator core 30. The second gasket 62 includes a plurality of holes into which corresponding projections formed in the flange portion 53 are press-fitted, and is attached so as to extend radially outward on the surface of the flange portion 53 opposite to the side plate portion 52. Moreover, the second gasket 62 has a plurality of holes 62o that are located radially outward of the flange portion 53 and are spaced circumferentially at the same pitch as the arrangement pitch of the holes 315 in the electromagnetic steel sheet 31. Each hole 62o is formed to have a larger opening area than the holes 315 in the electromagnetic steel sheet 31 when the second gasket 62 is compressed by a specified amount during installation.

[0024] As shown in Figure 6, the refrigerant guide member 50 (assembly) to which the first and second gaskets 61 and 62 are attached is fitted into a fitting portion (spigot portion) 21 formed in the case body 20 of the case 2. The fitting portion 21 is a cylindrical portion having an inner diameter slightly larger than the outer diameter of the side plate portion 52 of the refrigerant guide member 50 and the first gasket 61. The first gasket 61 and the side plate portion 52 of the refrigerant guide member 50 are fitted into the fitting portion 21, and the first gasket 61 abuts against an annular inner opposing portion 22 that extends radially inward from the tip of the fitting portion 21 (right end in Figure 6). The outer circumference of the second gasket 62 (the radially outer portion of the multiple holes 62o) abuts against an outer opposing portion 23 of the case body 20 that extends radially outward from the inner opposing portion 22 and on the cover 25 side (left side in Figure 6).

[0025] Furthermore, an annular space S is defined radially between the cylindrical portion 51 of the refrigerant guide member 50 and the case body 20, surrounding the cylindrical portion 51. As shown in Figure 6, the space S communicates with at least one refrigerant supply hole (refrigerant supply section) 20o formed in the case body 20, and lubricating cooling oil (lubricating cooling medium) for lubricating and cooling the rotating electric machine 1 is supplied to the refrigerant supply hole 20o from an oil pump or the like (not shown). The case body 20 and the refrigerant guide member 50 are provided with an anti-rotation structure that restricts the rotation of the refrigerant guide member 50 relative to the case 2.

[0026] Furthermore, as shown in Figure 6, the stator 3 described above is assembled inside the case body 20 such that one coil end portion Ea is surrounded radially by the cylindrical portion 51 of the refrigerant guide member 50, and the outer circumference of one end face 30a of the stator core 30 abuts against the second gasket 62. In addition, the stator 3 (stator core 30) is fastened to the case body 20 (case 2) via bolts (not shown) inserted through a plurality of bolt holes.

[0027] As a result, the first gasket 61 is compressed (crushed) in response to the fastening of the stator 3 to the case body 20, sealing the space between the side plate portion 52 that forms the end of the refrigerant guide member 50 opposite to the stator core 30 side and the inner opposing portion 22 (case 2) of the case body 20. Similarly, the second gasket 62 is also compressed (crushed) in response to the fastening of the stator 3 to the case body 20. As a result, the second gasket 62 seals the space between one end face 30a of the stator core 30 and the flange portion 53 that forms the other end of the refrigerant guide member 50 on the stator core 30 side, as well as the space between one end face 30a of the stator core 30 and the outer opposing portion 23 of the case body 20.

[0028] As shown in Figure 6, each hole 62o of the second gasket 62 communicates with the space S and a corresponding refrigerant passage 35 that opens at one end face 30a of the stator core 30. In this embodiment, the opening 36 of each refrigerant passage 35 at one end face 30a of the stator core 30 is defined by holes 315 of a plurality of electromagnetic steel sheets 31, and each opening 36 is located inside the corresponding hole 62o of the second gasket 62 and communicates with the space S through the hole 62o. Furthermore, each refrigerant passage 35 includes a radial passage 37 defined by slits 325 of a plurality of electromagnetic steel sheets 32 and an axial passage 38 defined by holes 335 of a plurality of electromagnetic steel sheets 33.

[0029] Each refrigerant passage 35's radial passage 37 communicates with a corresponding opening 36 and extends radially inward from the opening 36 to communicate with a corresponding axial passage 38. That is, each refrigerant passage 35's opening 36 and the axial passage 38 communicate via the radial passage 37. Furthermore, each refrigerant passage 35's axial passage 38 extends axially from the inner end of the radial passage 37 (one end face 30a side) toward the other end face 30b of the stator core 30, and opens near the outer circumference of the other coil end portion Eb of the stator coils CU, CV, and CW on the other end face 30b of the stator core 30. As a result, the openings 36 of the multiple refrigerant passages 35 on one end face 30a of the stator core 30 are located radially outward from the stator 3 than the openings 39 of the multiple refrigerant passages 35 (axial passages 38) on the other end face 30b of the stator core 30.

[0030] During operation of the rotating electric machine 1 configured as described above, lubricating coolant is supplied to the refrigerant supply hole 20o of the case body 20, and this lubricating coolant flows into the space S from the upper refrigerant supply hole 20o. A portion of the lubricating coolant that flows into the space S flows down along the cylindrical portion 51 of the refrigerant guide member 50, as shown by the dotted line in Figure 6, and is supplied to one coil end portion Ea of the stator coils CU, CV, and CW through the multiple refrigerant holes 51o of the cylindrical portion 51. In addition, a portion of the lubricating coolant that flows into the space S is guided towards the stator core 30 by the cylindrical portion 51 of the refrigerant guide member 50, as shown by the dotted line in Figure 6, and flows into each refrigerant passage 35 through the multiple holes 62o of the second gasket 62 and the opening 36 on one end face 30a of the stator core 30.

[0031] The lubricating coolant that flows into each refrigerant passage 35 flows through the radial passage 37 and the axial passage 38, flows out from the opening 39 on the other end face 30b of the stator core 30, and is supplied to the other coil end portion Eb of the stator coils CU, CV, and CW. Furthermore, the space between the side plate portion 52 (one end) of the refrigerant guide member 50 on the side opposite to the stator core 30 and the inner opposing portion 22 of the case body 20 is sealed by the first gasket 61, and both the space between the one end face 30a of the stator core 30 and the flange portion 53 (other end) of the refrigerant guide member 50 on the stator core 30 side, and the space between the one end face 30a of the stator core 30 and the outer opposing portion 23 of the case body 20 are sealed by the second gasket 62.

[0032] This effectively prevents lubricating coolant from flowing from the refrigerant supply hole 20o into the gap between the side plate portion 52 of the refrigerant guide member 50 and the inner opposing portion 22 of the case body 20, the gap between the stator core 30 and the flange portion 53 of the refrigerant guide member 50, and the gap between the stator core 30 and the outer opposing portion 23 of the case body 20, thereby enabling sufficient supply of lubricating coolant to the coil end portions Ea and Eb of both the stator coils CU, CV, and CW. In addition, by sealing both the gap between the stator core 30 and the flange portion 53 of the refrigerant guide member 50 and the gap between the stator core 30 and the outer opposing portion 23 of the case body 20 with the second gasket 62, the increase in the number of parts of the rotating electric machine 1 can be suppressed. As a result, it becomes possible to effectively cool the coil end portions Ea and Eb of the stator coils CU, CV, and CW while keeping the cost of the rotating electric machine 1 down. Furthermore, the lubricating coolant that cools one coil end Ea of the stator coils CU, CV, and CW is recovered through the refrigerant discharge hole 52o of the refrigerant guide member 50 and reused for lubricating and cooling the rotating electric machine 1. Similarly, the lubricating coolant that cools the other coil end Eb of the stator coils CU, CV, and CW is also recovered through an oil passage (not shown) and reused for lubricating and cooling the rotating electric machine 1.

[0033] Furthermore, each of the multiple holes 62o in the second gasket 62 has a larger opening area than the openings 36 of the multiple refrigerant passages 35 on one end face 30a of the stator core 30 when installed as described above. This prevents the openings 36 from being blocked by the second gasket 62 and ensures a sufficient amount of lubricating coolant supplied from the refrigerant supply hole 20o to the other coil end portion Eb of the stator coils CU, CV, and CW via the multiple refrigerant passages 35.

[0034] Furthermore, the first gasket 61 is attached to the outer circumference of the side plate portion 52 (one end) of the refrigerant guide member 50, and the second gasket 62 is attached to the flange portion 53 (the other end) of the refrigerant guide member 50. This makes it possible to further improve the ease of assembly of the first and second gaskets 62 to the stator 3 and the case body 20 (case 2). However, the first and second gaskets 61 and 62 do not necessarily have to be attached to the refrigerant guide member 50, and may be assembled separately to the stator 3 and the case body 20 (case 2).

[0035] Furthermore, the case body 20 includes an inner opposing portion 22 and an outer opposing portion 23. The inner opposing portion 22 is located on the opposite side of the refrigerant supply hole 20o from the stator core 30 side and is radially inward of the stator 3 than the outer opposing portion 23, and faces the side plate portion 52 (one end) of the refrigerant guide member 50 with a gap in the axial direction of the stator 3. The outer opposing portion 23 is located on the stator core 30 side of the refrigerant supply hole 20o and faces the one end face 30a of the stator core 30 with a gap in the axial direction of the stator 3. Furthermore, the first gasket 61 seals the space between the side plate portion 52 (one end) of the refrigerant guide member 50 and the inner opposing portion 22. In addition, the second gasket 62 seals the space between the one end face 30a of the stator core 30 and the flange portion 53 of the refrigerant guide member 50, as well as the space between the one end face 30a of the stator core 30 and the outer opposing portion 23. This makes it possible to absorb both the variation in the distance between one end face 30a of the stator core 30 and the outer opposing portion 23, and the variation in the distance between one end face 30a of the stator core 30 and the flange portion 53 of the refrigerant guide member 50, by adjusting the thickness of the first gasket 61.

[0036] Furthermore, each of the multiple refrigerant passages 35 includes a radial passage 37 and an axial passage 38. Each radial passage 37 connects the opening 36 of the refrigerant passage 35 at one end face 30a of the stator core 30 to the axial passage 38. The axial passage 38 opens at the other end face 30b of the stator core 30 and extends axially from the stator 3 toward the radial passage 37 (one end face 30a). The openings 36 of the multiple refrigerant passages 35 at one end face 30a of the stator core 30 are located radially outward from the openings 39 of the multiple refrigerant passages 35 at the other end face 30b of the stator core 30. This allows the refrigerant guide member 50, positioned radially outward from one coil end Ea of the stator coils CU, CV, and CW, to distribute the lubricating coolant from the refrigerant supply hole 20o to the one coil end Ea side and the stator core 30 side via the refrigerant passages 35, while simultaneously supplying the lubricating coolant to the other coil end Eb of the stator coils CU, CV, and CW.

[0037] As described above, the rotating electric machine 1 of this disclosure includes a case body 20 that, together with the cover 25, constitutes a case 2, an annular stator 3 disposed within the case body 20, a rotor 4 rotatably disposed within the stator 3, a plurality of refrigerant passages 35, a refrigerant guide member 50, a first gasket 61, and a second gasket 62. The plurality of refrigerant passages 35 are formed in the stator core 30 at circumferential intervals so as to extend from one end face 30a to the other end face 30b of the stator core 3. Each of the plurality of refrigerant passages 35 opens at one end face 30a and the other end face 30b of the stator core 30. The refrigerant guide member 50 includes a cylindrical portion 51 that surrounds one coil end portion Ea of the stator coils CU, CV, CW wound around the stator core 30, and a plurality of refrigerant holes 51o formed at circumferential intervals in the cylindrical portion 51. The refrigerant guide member 50 guides lubricating cooling oil (refrigerant) from the refrigerant supply hole 20o formed in the case body 20 to one coil end Ea side and the stator core 30 side. The first gasket 61 seals the space between the side plate portion 52 of the refrigerant guide member 50 (the end opposite to the stator core 30 side) and the case body 20. The second gasket 62 includes a plurality of holes 62o formed at intervals in the circumferential direction, and each hole 62o communicates with an opening 36 in the end face 30a of the stator core 30 of the corresponding refrigerant passage 35. The second gasket 62 seals the space between the end face 30a of the stator core 30 and the flange portion 53 of the refrigerant guide member 50 (the end on the stator core 30 side), and also seals the space between the end face 30a of the stator core 30 and the case body 20. As a result, it becomes possible to effectively cool the coil end portions Ea and Eb of the stator coils CU, CV, and CW while keeping the cost increase of the rotating electric machine 1 down.

[0038] The invention disclosed herein is not limited in any way to the embodiments described above, and it goes without saying that various modifications can be made within the scope of this disclosure. Furthermore, the embodiments described above are merely one specific form of the invention described in the summary section of the invention, and do not limit the elements of the invention described in the summary section of the invention. [Industrial applicability]

[0039] The invention disclosed herein is applicable in industries such as the manufacturing of rotating electric machines. [Explanation of Symbols]

[0040] 1 Rotating electric machine, 2 Case, 20 Case body, 20o Refrigerant supply hole, 21 Fitting part, 22 Inner opposing part, 23 Outer opposing part, 25 Cover, 3 Stator, 30 Stator core, 30a One end face, 30b Other end face, 31, 32, 33 Electrical steel sheet, 35 Refrigerant passage, 36, 39 Opening, 37 Radial passage, 38 Axial passage, 4 Rotor, 40 Rotor shaft, 41 Rotor core, 50 Refrigerant guide member, 51 Cylindrical part, 51o Refrigerant hole, 52 Side plate part, 52o Refrigerant discharge hole, 53 Flange part, 61 First gasket, 62 Second gasket, 62o Hole part, 310, 320, 330 Center hole, 311, 321, 331 Protrusion, 312, 322, 332 Notches, 314, 324, 334 bolt holes, 315, 335 holes, 325 slit, CU, CV, CW stator coil, Ea, Eb coil end section, S space.

Claims

1. A rotating electric machine comprising a case, an annular stator disposed within the case and including a stator core and stator coils wound around the stator core, and a rotor rotatably disposed within the stator, A plurality of refrigerant passages are formed in the stator core at circumferential intervals so as to extend from one end face to the other end face of the stator core, and each of these passages opens at the one end face and the other end face of the stator core, A refrigerant guide member includes a cylindrical portion that surrounds one coil end of the stator coil, and a plurality of refrigerant holes formed at circumferential intervals in the cylindrical portion, which guides refrigerant from a refrigerant supply unit formed in the case to the one coil end and the stator core. A first sealing member that seals the space between the end of the refrigerant guide member opposite to the stator core side and the case, A second sealing member includes a plurality of holes formed at circumferential intervals so as to communicate with the opening at one end face of the stator core of the corresponding refrigerant passage, which seals the space between the one end face of the stator core and the other end of the refrigerant guide member on the stator core side, and also seals the space between the one end face of the stator core and the case, A rotating electric machine equipped with the following features.

2. In the rotating electric machine described in claim 1, A rotating electric machine in which each of the plurality of holes in the second sealing member has an opening area larger than the openings of the plurality of refrigerant passages at one end face of the stator core.

3. In the rotating electric machine according to claim 1 or 2, A rotating electric machine in which the first sealing member is attached to one end of the refrigerant guide member, and the second sealing member is attached to the other end of the refrigerant guide member.

4. In the rotating electric machine according to claim 1 or 2, The case includes an outer opposing portion that faces one end face of the stator core on the stator core side of the refrigerant supply unit at a distance in the axial direction of the stator, and an inner opposing portion that faces one end of the refrigerant guide member at a distance in the axial direction, on the opposite side of the refrigerant supply unit from the stator core side and further inward in the radial direction of the stator than the outer opposing portion. The first sealing member seals the space between the one end of the refrigerant guide member and the inner opposing portion. The second sealing member seals the space between the one end face of the stator core and the outer opposing portion of the rotating electric machine.

5. In the rotating electric machine according to claim 1 or 2, Each of the plurality of refrigerant passages includes an axial passage that opens at the other end face of the stator core and extends in the axial direction of the stator toward the one end face, and a radial passage that connects the axial passage with the opening of the refrigerant passage at the one end face of the stator core. A rotating electric machine in which the openings of the plurality of refrigerant passages on one end face of the stator core are located radially outward from the openings of the plurality of refrigerant passages on the other end face of the stator core.

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