Rotating electric machines

Abstract

A rotating electric machine, wherein a frame (21) disposed between an outer peripheral surface of a stator (10) and a housing (30) comprises: a main wall (213) which divides a space (40) between the housing (30) and the frame (21) in an axial direction to form a plurality of flow paths; and ribs (214, 215, 216, 217, 218, 219) which are respectively disposed in the plurality of flow paths and extend in the circumferential direction of the frame, and a main wall opening (213a) disposed in the main wall and a rib opening (214b, 215b, 216b, 217b, 218b, 219b) disposed in the rib are arranged opposite to each other in the axial direction of the frame (21).

Description

Technical Field

[0001] The present application relates to a rotating electrical machine. Background Art

[0002] Among rotating electrical machines such as motors and generators, there is a known rotating electrical machine that uses a pump to circulate a refrigerant in a flow path formed around a stator to cool the stator in order to increase output. For example, Patent Document 1 discloses a rotating electrical machine that is configured to form a spiral flow path between a frame that fixes the stator and a housing that is an outer wall, and circulate the refrigerant in the flow path.

[0003] In addition, patent document 2 discloses a rotating electric machine, which is constructed to form a cooling space between an inner cylinder that fixes a stator and an outer cylinder that covers the surface of the stator, wherein a plurality of grooves are formed axially on the surface of the inner cylinder in the cooling space, and the cooling space is divided axially by a spacer, and an opening is provided at the spacer on the side opposite to an inlet and an outlet in the radial direction, the inlet is provided on the side of one of the divided cooling spaces, and the outlet is provided on the side of the other divided cooling space, so that a refrigerant flowing into one of the cooling spaces from the inlet flows into the other cooling space from the opening of the spacer and flows out to the outside from the outlet.

[0004] Prior art literature

[0005] Patent Literature

[0006] [Patent Document 1] Japanese Utility Model Application Laid-Open No. 01-131256

[0007] [Patent Document 2] Japanese Patent Application Publication No. 2013-042661

[0008] According to the existing rotating electric machine disclosed in Patent Document 1, when the structure is complex and it is manufactured by die casting, a die casting mold divided in at least four directions in the circumferential direction is required, which has a technical problem of increased manufacturing cost. In addition, according to the existing rotating electric machine disclosed in Patent Document 2, the groove formed on the surface of the inner cylinder in the cooling space becomes an obstacle to the axial flow of the refrigerant at the opening of the spacer, and the flow rate of the refrigerant becomes uneven and cannot be cooled uniformly. In addition, the change in the cross-sectional area of ​​the flow path at the opening will cause pressure loss, requiring a larger capacity pump, which has a technical problem of increased cost. Summary of the invention

[0009] The present application discloses a technology for solving the above-mentioned technical problems, and an object of the present application is to provide a rotating electrical machine that can achieve uniform cooling of a refrigerant at a low cost.

[0010] The rotating electrical machine disclosed in the present application comprises:

[0011] a stator, wherein the stator encloses the rotor inside;

[0012] a frame having the stator fitted in an inner peripheral surface portion of the frame; and

[0013] a housing configured to cover an outer peripheral surface of the frame,

[0014] The frame includes a first partition wall and a second partition wall arranged on the outer peripheral surface portion at a distance therebetween in the axial direction of the frame.

[0015] The rotating motor is configured to allow the refrigerant to flow from a refrigerant inlet provided in the housing to a space formed between the housing and the frame, and to allow the refrigerant flowing into the space to flow out of the space from a refrigerant outlet provided in the housing, wherein:

[0016] The frame comprises:

[0017] a main wall provided on the outer peripheral surface portion of the frame body and dividing the space portion along the axial direction to form a plurality of flow paths; and

[0018] ribs, the ribs are respectively arranged on the plurality of flow paths and extend along the circumference of the frame,

[0019] The main wall includes a main wall opening portion opening toward the axial direction,

[0020] The rib includes a rib opening portion opened toward the axial direction,

[0021] The main wall opening and the rib opening are arranged to face each other in the axial direction.

[0022] According to the rotating electrical machine disclosed in the present application, it is possible to obtain a rotating electrical machine that can achieve uniform cooling with a refrigerant at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The schematic diagram showing a partial cross section of the rotating electrical machine according to the first embodiment.

[0024] Figure 2 It is a perspective view showing a frame and a casing of the rotating electrical machine according to the first embodiment.

[0025] Figure 3A is from Figure 2 The side view of the housing of the rotating electrical machine according to the first embodiment is viewed from the direction of arrow A shown.

[0026] Figure 3B is from Figure 2The side view of the housing of the rotating electrical machine according to the first embodiment is viewed from the direction of arrow B shown.

[0027] Figure 4 It is along Figure 3A and Figure 3B A schematic cross-sectional view of line CC.

[0028] Figure 5 It is a schematic diagram showing a housing of a rotating electrical machine according to the second embodiment.

[0029] Figure 6 It is a schematic diagram showing a housing of a rotating electrical machine according to a third embodiment.

[0030] Fig. 7A It is a perspective view showing a housing of a rotating electrical machine according to a fourth embodiment.

[0031] Figure 7B is from Fig. 7A A side view of the housing of the rotating electrical machine according to the fourth embodiment as viewed from the direction of arrow F shown.

[0032] Figure 8 It is an explanatory diagram showing a modified example of the housing of the rotating electrical machine according to the fourth embodiment.

[0033] (Explanation of symbols)

[0034] 100 Rotating motor;

[0035] 1 rotor shaft;

[0036] 7 Bracket;

[0037] 71 recess;

[0038] 72 bracket through hole;

[0039] 8 gap;

[0040] 9 screws;

[0041] 10 stator;

[0042] 11 stator core;

[0043] 12 stator coil;

[0044] 21 frame;

[0045] 210 frame body;

[0046] 211 first partition wall;

[0047] 211a, 212a grooves;

[0048] 211c, 212c O-rings;

[0049] 212 second partition wall;

[0050] 212b eaves;

[0051] 213 main wall;

[0052] 213a main wall opening;

[0053] 2131 First main wall;

[0054] 2132 Second main wall;

[0055] 2133 Third main wall;

[0056] 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225 ribs;

[0057] 214a, 215a, 216a, 217a, 218a, 219a first rib opening;

[0058] 214b, 215b, 216b, 217b, 218b, 219b second rib opening;

[0059] 281 First flow path;

[0060] 282 Second flow path;

[0061] 30 housing;

[0062] 31 housing wall;

[0063] 311 Shell through hole;

[0064] 32 flange portion;

[0065] 71, 321 concavity;

[0066] 33 refrigerant inlet;

[0067] 34 refrigerant outlet;

[0068] 40 Space Department;

[0069] 60 rotors;

[0070] 62 rotor core;

[0071] 63 permanent magnet;

[0072] 300 intermediate wall;

[0073] 300a, 300b have inclined faces. DETAILED DESCRIPTION

[0074] Implementation Method 1

[0075] Hereinafter, a rotating electrical machine according to Embodiment 1 will be described based on the drawings. Figure 1 Schematic diagram showing a rotating electrical machine according to Embodiment 1 in partial cross section. Figure 1 In the figure, the rotating electric machine 100 includes: a rotor 60 fixed to a rotor shaft 1; a stator 10 enclosing the rotor 60 with a gap 8 therebetween; a cylindrical frame 21 surrounding the outer periphery of the stator 10 and having both axial ends open; a housing 30 surrounding the outer periphery of the frame 21; and a bracket 7 fixed integrally to the housing 30.

[0076] The stator 10 includes a stator core 11 formed by stacking a plurality of electromagnetic steel sheets in the axial direction, and a plurality of stator coils 12 inserted into and wound around slots 13 formed in the stator core 11. The stator coils 12 may be concentratedly wound between adjacent slots or distributedly wound across a plurality of slots.

[0077] The rotor 60 is a permanent magnet type rotor, which includes: a cylindrical rotor core 62 with the rotor shaft 1 passing through its axial center position; and a plurality of permanent magnets 63 buried on the outer peripheral surface side of the rotor core 62. The rotor core 62 is formed by stacking a plurality of electromagnetic steel plates in the axial direction. The permanent magnets 63 are arranged in the circumferential direction of the rotor core 62 at a predetermined interval and constitute excitation magnetic poles. In addition, the rotor 60 is not limited to a permanent magnet type rotor, and can also be a so-called cage rotor in which a plurality of uninsulated rotor conductors are accommodated in the slots of the rotor core 62 and the two sides of these rotor conductors are short-circuited by short-circuit rings, or a winding type rotor in which a rotor coil serving as an excitation coil is installed in the slots of the rotor core 62.

[0078] One axial end of the housing 30 is blocked by the housing wall 31, and the other axial end is open. A flange portion 32 is provided at the peripheral portion of the other axial end of the housing 30. The flange portion 32 is fixed to the bracket 7 by a plurality of screws 9. Thus, the housing 30 is fixed to the bracket 7, and the other axial end of the housing 30 is blocked by the bracket 7. The housing 30 is provided with a refrigerant inlet portion 33 and a refrigerant outlet portion 34 arranged at intervals in the axial direction at predetermined positions in the circumferential direction. The refrigerant inlet portion 33 and the refrigerant outlet portion 34 are open at the inner circumferential surface portion of the housing 30.

[0079] A housing through hole 311 is formed in the radial center of the housing wall portion 31 that blocks one axial end of the housing 30. The first bearing 201 is inserted into the housing through hole 311, and the outer ring of the first bearing 201 is fixed to the housing wall portion 31. The bracket 7 has a recessed portion 71 that is recessed in the axial direction on the inner wall surface opposite to the stator 10. The end of the stator coil 12 on the bracket side is accommodated in the recessed portion 71 of the bracket 7. A bracket through hole 72 is formed in the radial center of the bracket 7. The second bearing 202 is inserted into the bracket through hole 72, and the outer ring of the second bearing 202 is fixed to the bracket 7.

[0080] One axial end 111 of the rotor shaft 1 is fixed to the inner ring of the first bearing 201, and is rotatably supported on the housing wall 31 via the outer ring of the first bearing 201, and passes through the housing through hole 311 to protrude axially from the housing wall 31. The other axial end 112 of the rotor shaft 1 is fixed to the inner ring of the second bearing 202, and is rotatably supported on the bracket 7 via the outer ring of the second bearing 202, and passes through the bracket through hole 72 to protrude axially from the bracket 7. The inner circumferential surface of the frame 21 is fitted with the outer circumferential surface of the stator core 11, and one axial end is open, and the other axial end abuts against the inner wall surface of the bracket 7 and is blocked by the bracket 7.

[0081] Next, the frame body 21 and the housing 30 will be described in detail. Figure 2 is a perspective view showing a frame and a casing of the rotating electrical machine according to the first embodiment, Figure 3A is from Figure 2 A side view of the housing of the rotating electrical machine according to the first embodiment as viewed in the direction of arrow A shown in FIG. Figure 3B is from Figure 2 A side view of the housing of the rotating electrical machine according to the first embodiment as viewed in the direction of arrow B shown in FIG. Figure 4 It is along Figure 3A and Figure 3B A simplified cross-sectional view of the CC line in FIG. Figures 1 to 4 In the figure, the frame 21 includes a frame body 210 formed in a cylindrical shape, and an annular first partition wall 211, an annular second partition wall 212, an annular main wall 213 and ribs 214, 215, 216, 217, 218, and 219 serving as multiple auxiliary walls are provided on the outer peripheral surface of the frame body 210.

[0082] The frame body 210, the first partition wall 211, the second partition wall 212 and the main wall 213 are formed integrally by die-casting of aluminum material, for example. In addition, relative to the frame body 210, at least one of the first partition wall 211, the second partition wall 212 and the main wall 213 can also be formed as a split body and fixed to the outer peripheral surface of the frame body 210. The first partition wall 211 has a groove 211a extending over the entire circumference of its outer peripheral surface. The second partition wall 212 is formed with a groove 212a extending over the entire circumference of its outer peripheral surface. A flange 212b extending in the radial direction is formed at the axial end of the second partition wall 212.

[0083] like Figure 1 and Figure 2 As shown, the first partition wall 211 and the second partition wall 212 of the frame 21 are fitted with the inner peripheral surface of the housing 30. An O-ring 211c made of silicon is inserted into the groove 211a of the first partition wall 211, and an O-ring 212c made of silicon is inserted into the groove 212a of the second partition wall 212. The space 40 surrounded by the inner peripheral surface of the housing 30, the outer peripheral surface of the frame 21, the first partition wall 211, and the second partition wall 212 is sealed liquid-tight by the O-ring 211c and the O-ring 212c. In addition, at least one of the O-ring 211c and the O-ring 212c can also be replaced by a gasket or replaced by coated silicon.

[0084] The flange portion 212 b of the second partition wall 212 in the frame 21 is inserted into the recess 321 formed on the inner peripheral surface of the flange portion 32 of the housing 30 , and is sandwiched between the inner wall surface of the recess 321 of the housing 30 and the inner wall surface of the bracket 7 .

[0085] The main wall 213 is provided at the central part of the space portion 40 in the axial direction. The outer peripheral surface of the main wall 213 abuts against the inner peripheral surface of the housing 30, or faces the inner peripheral surface of the housing 30 with a small gap therebetween. The main wall 213 is located at a position on the opposite side of the circumferential direction relative to the circumferential position of the housing 30 opposite to the refrigerant inlet portion 33 and the refrigerant outlet portion 34, including Figure 3B The main wall opening 213a is shown as an opening toward the axial direction of the frame. The space portion 40 is separated by the main wall 213 into a space portion on the first partition wall 211 side and a space portion on the second partition wall 212 side. The space portion on the second partition wall 212 side constitutes a first flow path 281, and the space portion on the first partition wall 211 side constitutes a second flow path 282. That is, the main wall 213 provided on the outer peripheral surface of the frame 21 divides the space portion 40 along the axial direction of the frame to form a first flow path 281 and a second flow path 282 as a plurality of flow paths.

[0086] The first flow path 281 and the second flow path 282 are connected through the main wall opening 213a of the main wall 213. The refrigerant inlet 33 provided in the housing 30 is communicated with the first flow path 281, and the refrigerant outlet 34 provided in the housing 30 is communicated with the second flow path 282. That is, the first flow path 281 is arranged corresponding to the refrigerant inlet 33, and the second flow path 282 is arranged corresponding to the refrigerant outlet 34.

[0087] The ribs 214, 215, 216 as the auxiliary walls are arranged between the first partition wall 211 and the main wall 213, that is, arranged in the second flow path 282, and are arranged at intervals from each other in the axial direction of the frame body. The radial height of the ribs 214, 215, 216 starting from the outer peripheral surface of the frame body 210 is set to be smaller than the radial height of the first partition wall 211 and the main wall 213, such as Figure 1 As shown, the outer peripheral surfaces of the ribs 214 , 215 , and 216 face the inner peripheral surface of the housing 30 with a gap therebetween.

[0088] Similarly, the ribs 217, 218, 219 as the auxiliary walls are arranged between the main wall 213 and the second partition wall 212, that is, arranged in the first flow path 281, and are arranged at intervals from each other in the axial direction of the frame. The radial height of the ribs 217, 218, 219 starting from the outer peripheral surface of the frame body 210 is set to be smaller than the radial height of the main wall 213 and the second partition wall 212, such as Figure 1 As shown, the outer peripheral surfaces of the ribs 217, 218, and 219 face the inner peripheral surface of the housing 30 with a gap therebetween.

[0089] The ribs 214, 215, 216, 217, 218, 219 are integrally formed by die-casting of aluminum material together with the frame body 210. In addition, at least one of the ribs 214, 215, and 216 may be formed separately from the frame body 210 and fixed to the outer peripheral surface of the frame body 210.

[0090] The rib 219 includes a first rib opening portion 219a that opens toward the axial direction of the frame at a portion corresponding to the refrigerant inlet portion 33. The first rib opening portion 219a is formed by forming inclined surfaces 2191 and 2192 on the rib 219 that gently incline from the outer peripheral surface of the rib 219 toward the outer peripheral surface of the frame body 210 and reach the outer peripheral surface of the frame body 210. The inclined surfaces 2191 and 2192 are formed in an arc shape or a straight line shape. Similarly, the rib 218 and the rib 217 also include first rib opening portions 218a and 217a that open toward the axial direction of the frame at a portion corresponding to the refrigerant inlet portion 33, respectively. The first rib opening portions 218a and 217a each include an inclined surface portion that is the same as the first rib opening portion 219a.

[0091] The first rib openings 217a, 218a, and 219a are arranged as a whole to be substantially circular and face the refrigerant inlet 33, and the circumferential widths of the first rib openings 217a and 219a of the ribs 217 and 219 located on both axial sides of the rib 218 are formed to be the same, and the circumferential width of the first rib opening 218a of the central rib 218 is formed to be larger than the circumferential widths of the first rib openings 217a and 219a on both sides. With this configuration, the refrigerant from the refrigerant inlet 33 can flow evenly to the first flow path 281.

[0092] The rib 214 includes a first rib opening 214a at a portion corresponding to the refrigerant outlet 34. The first rib opening 214a is formed by forming inclined surfaces 2141 and 2142 on the rib 214 that gently incline from the outer peripheral surface of the rib 214 toward the outer peripheral surface of the frame body 210 and reach the outer peripheral surface of the frame body 210. The inclined surfaces 2141 and 2142 are formed in an arc shape or a straight line shape. Similarly, the ribs 215 and 216 also include first rib openings 215a and 216a at a portion corresponding to the refrigerant outlet 34. The first rib openings 215a and 216a respectively include the same inclined surfaces as the first rib opening 214a.

[0093] The first rib openings 214a, 215a, and 216a are arranged as a whole to be substantially circular and opposed to the refrigerant outlet 34. The circumferential widths of the first rib openings 214a and 216a of the ribs 214 and 216 on both sides of the rib 215 are formed to be the same, and the circumferential width of the first rib opening 215a of the central rib 215 is formed to be larger than the circumferential widths of the first rib openings 214a and 216a on both sides. With this configuration, the refrigerant from the second flow path 282 can flow to the refrigerant outlet 34 uniformly.

[0094] like Figure 3B As shown, the ribs 214, 215, 216 include second rib openings 214b, 215b, 216b on the circumferentially opposite sides of the frame body 210 relative to the respective first rib openings 214a, 215a, 216a. In addition, the ribs 217, 218, 219 include second rib openings 217b, 218b, 219b on the circumferentially opposite sides of the frame body 210 relative to the respective first rib openings 217a, 218a, 219a. These second rib openings 214b, 215b, 216b and the second rib openings 217b, 218b, 219b are arranged relative to each other in the axial direction with the main wall opening 213a as the center.

[0095] Here, if the axial length of the side surface of the second partition wall 212 relative to the side surface of the main wall 213 is set to D, it is desirable that the circumferential length of the main wall opening 213a provided in the main wall 213 is [2×D]. In addition, since the main wall 213 is provided in the central part of the space 40 as described above, the axial length of the side surface of the first partition wall 211 relative to the side surface of the main wall 213 is also D.

[0096] The second rib openings 214b, 215b, and 216b provided on the ribs 214, 215, and 216 are formed so that the circumferential widths thereof become smaller as they are closer to the first partition wall 211. That is, the circumferential width of the second rib opening 214b is set to be less than the circumferential width of the second rib opening 215b and less than the circumferential length of the second rib opening 216b. Furthermore, the circumferential width of the second rib opening 216b is set to be less than the circumferential width of the main wall opening 213a (=2D).

[0097] The second rib openings 217b, 218b, and 219b provided on the ribs 217, 218, and 219 are formed so that the circumferential widths thereof become smaller as they are closer to the second partition wall 212. That is, the circumferential width of the second rib opening 219b is set to be less than the circumferential width of the second rib opening 218b and less than the circumferential length of the second rib opening 217b. Furthermore, the circumferential width of the second rib opening 217b is set to be less than the circumferential width of the main wall opening 213a (=2D).

[0098] Here, if the axial length of the side wall of the rib 217 relative to the side wall of the second partition wall 212 is set to E1, the circumferential width of the second rib opening 217b of the rib 217 is set to "2×E1". If the axial length of the side wall of the rib 218 relative to the side wall of the second partition wall 212 is set to E2, the circumferential width of the second rib opening 218b of the rib 218 is set to "2×E2". If the axial length of the side wall of the rib 219 relative to the side wall of the second partition wall 212 is set to E3, the circumferential width of the second rib opening 219b of the rib 219 is set to "2×E3".

[0099] Similarly, if the axial length of the side wall of the rib 216 relative to the side wall of the first partition wall 211 is set to E1, the circumferential width of the second rib opening 216b of the rib 216 is set to "2×E1". If the axial length of the side wall of the rib 215 relative to the side wall of the first partition wall 211 is set to E2, the circumferential width of the second rib opening 215b of the rib 215 is set to "2×E2". If the axial length of the side wall of the rib 214 relative to the side wall of the first partition wall 211 is set to E3, the circumferential width of the second rib opening 214b of the rib 214 is set to "2×E3".

[0100] Thus, it is desirable that the circumferential width of the second rib opening of the rib be set to twice the axial length of the side wall of the rib facing the side wall of the partition wall.

[0101] In the rotating electric machine according to embodiment 1 constructed as described above, the refrigerant supplied from the refrigerant inlet portion 33 to the first rib openings 217a, 218a, and 219a by an externally arranged pump (not shown) takes the first rib openings 217a, 218a, and 219a as the starting point, is branched along the circumferential direction of the frame body 210 in the first flow path 281, flows through half of the outer circumferential surface portion of the frame body 210, and converges at the second rib openings 217b, 218b, and 219b.

[0102] The refrigerant in the first flow path 281 that converges at the second rib openings 217b, 218b, and 219b flows along the axial direction of the frame body through the main wall opening 213a provided on the main wall 213 and reaches the second rib openings 216b, 215b, and 214b in the second flow path 282. Starting from the second rib openings 216b, 215b, and 214b, the refrigerant in the second flow path 281 diverges along the circumferential direction of the frame body 210 in the second flow path 282, flows through half of the outer circumferential surface of the frame body 210 respectively, and converges at the first rib openings 214a, 215a, and 216a.

[0103] In this way, the refrigerant in the second flow path 282 that converges at the first rib openings 214a, 215a, and 216a flows out from the refrigerant outlet portion 34 to the outside, is cooled by, for example, a cooling device (not shown), and is again supplied to the first flow path 281 from the refrigerant inlet portion 33 by a pump. By circulating the refrigerant in the rotating electrical machine as described above, the stator of the rotating electrical machine is cooled, and the rotating electrical machine as a whole is cooled.

[0104] According to the rotary electric machine of embodiment 1, the refrigerant flowing into the first flow path from the refrigerant inlet portion 33 through the first rib opening portion can flow to the second rib opening portion located on the radially opposite side relative to the first rib opening portion without changing its flow path cross-sectional area. In addition, the refrigerant can flow into the second flow path by changing the flow in the axial direction through the main wall opening portion without changing the flow path cross-sectional area, and further flow from the second flow path to the first rib opening portion on the radially opposite side to flow out to the outside from the refrigerant outlet portion. Since the cross-sectional area of ​​the refrigerant does not change, the occurrence of pressure loss can be suppressed and the output of the pump can be reduced. In addition, since the first flow path and the second flow path are respectively separated by the ribs in the axial direction, the refrigerant is evenly distributed inside the first flow path and the second flow path, so that the entire frame can be evenly cooled and the rotary electric machine can be effectively cooled.

[0105] The main wall 213, the first partition wall 211 and the second partition wall 212 have the function of preventing the refrigerant from flowing out from the first flow path 281 and the second flow path 282 in the axial direction of the frame body. In contrast, the ribs 214, 215, 216, 217, 218, 219 as the auxiliary walls only have the function of increasing the surface area of ​​the frame body 21 to improve the cooling effect of the stator 10, and do not include the function of preventing the refrigerant from flowing out in the axial direction. Therefore, the height dimension of the ribs 214, 215, 216, 217, 218, 219 can be manufactured with a lower precision than the height dimension of the main wall 213, the first partition wall 211 and the second partition wall 212, and therefore, the ribs 214, 215, 216, 217, 218, 219 have the advantage of good productivity.

[0106] In addition, during assembly, when the frame 21 is axially inserted into the inner circumferential surface of the shell 30, since the height dimensions of the ribs 214, 215, 216, 217, 218, and 219 are smaller than the height dimensions of the main wall 213, the first partition wall 211, and the second partition wall 212, the ribs 214, 215, 216, 217, 218, and 219 will not interfere with the shell 30, thereby having the advantage of easy assembly.

[0107] Implementation Method 2

[0108] Next, a rotary electric machine according to Embodiment 2 will be described. In Embodiment 1, two rows of first flow paths and second flow paths are formed in the frame in the axial direction, but three or more rows of flow paths may be provided. Figure 5 1 is a schematic diagram showing a housing of a rotating electrical machine according to Embodiment 2, and shows a case where the flow paths are arranged in three rows.

[0109] like Figure 5 As shown, a first main wall 2131 and a second main wall 2132 are provided on the outer peripheral surface of the frame body 210, and ribs 214, 215, and 216 as auxiliary walls are provided between the first partition wall 211 and the first main wall 2131. In addition, ribs 217, 218, and 219 as auxiliary walls are provided between the first main wall 2131 and the second main wall 2132. In addition, ribs 220, 221, and 222 as auxiliary walls are provided between the second main wall 2132 and the second partition wall 212.

[0110] The first flow path 281 is formed between the second partition wall 212 and the second main wall 2132, the second flow path 282 is formed between the first main wall 2131 and the second main wall 2132, and the third flow path 283 is formed between the first main wall 2131 and the first partition wall 211. The refrigerant inlet portion 33 is provided in the housing 30 at a position corresponding to the first flow path 281, and the refrigerant outlet portion 34 is provided in the housing 30 at a position on the circumferentially opposite side of the frame body 210 relative to the refrigerant inlet portion 33 and corresponding to the third flow path 283.

[0111] The first rib openings of the ribs 220, 221, 222 that are opened in the axial direction of the frame are formed at positions opposite to the refrigerant inlet portion 33. The second rib openings of the ribs 220, 221, 222 that are opened in the axial direction of the frame, the main wall opening of the second main wall 2132 that is opened in the axial direction of the frame, and the second opening of one of the ribs 217, 218, 219 that is opened in the axial direction of the frame are respectively formed on the circumferentially opposite side of the frame body 210 relative to the refrigerant inlet portion 33. The other second rib openings of the ribs 217, 218, 219 that are opened in the axial direction of the frame, the main wall opening of the first main wall 2131 that is opened in the axial direction of the frame, and the second rib openings of the ribs 214, 215, 216 that are opened in the axial direction of the frame body are respectively formed at circumferential positions of the frame body 210 where the refrigerant inlet portion 33 is provided. The first rib opening portions of the ribs 214 , 215 , and 216 that are open in the axial direction of the frame are formed at positions that face the refrigerant outlet portion 34 .

[0112] Here, the first rib opening has the same structure as the first rib opening in Embodiment 1, the second rib opening has the same structure as the second rib opening in Embodiment 1, and the main wall opening has the same structure as the main wall opening in Embodiment 1. Ribs 217, 218, and 219 do not include the first rib opening, and the second rib openings are provided at two locations, with one second rib opening and the other rib opening existing on opposite sides of each other in the circumferential direction.

[0113] In the rotating electric machine according to embodiment 2 constructed as described above, the refrigerant supplied from the refrigerant inlet portion 33 to the first rib openings of the ribs 220, 221, and 222 by an externally arranged pump (not shown) is split along the circumference of the frame body 210 in the first flow path 281 with the first rib opening as the starting point, and flows through half the circumference of the outer circumferential surface of the frame body 210 respectively, and converges at the second rib openings of the ribs 220, 221, and 222.

[0114] The refrigerant of the first flow path 281 that converges at the second rib openings of the ribs 220, 221, and 222 flows along the axial direction of the frame body through the main wall openings arranged in the second main wall 2132 and reaches a second rib opening of the ribs 217, 218, and 219 in the second flow path 282. Taking the second rib opening as the starting point, the refrigerant is divided along the circumferential direction of the frame body 210 in the second flow path 282, flows through half of the outer circumferential surface of the frame body 210 respectively, and converges at another second rib opening of the ribs 217, 218, and 219.

[0115] The refrigerant in the second flow path 282 that converges at another rib opening of the ribs 217, 218, 219 flows along the axial direction of the frame through the main wall opening of the first main wall 2131 and reaches the second rib opening of the ribs 214, 215, 216 in the third flow path 283. Starting from the second rib opening, the refrigerant is divided along the circumferential direction of the frame body 210 in the third flow path 283, flows through half of the outer circumferential surface of the frame body 210 respectively, and converges at the first rib opening of the ribs 214, 215, 216.

[0116] The refrigerant that converges at the first rib openings of the ribs 214, 215, and 216 flows out from the refrigerant outlet 34 to the outside, is cooled by, for example, a cooling device (not shown), and is supplied to the third flow path 283 again from the refrigerant inlet 33 by a pump. By circulating the refrigerant in the rotating electrical machine as described above, the stator of the rotating electrical machine is cooled, and the rotating electrical machine as a whole is cooled.

[0117] According to the rotating electrical machine of the second embodiment described above, the same effects as those of the rotating electrical machine of the first embodiment described above can be obtained.

[0118] Implementation 3

[0119] Next, a rotary electric machine according to Embodiment 3 will be described. In Embodiment 1, two rows of first and second flow paths are formed in the frame in the axial direction, but in the rotary electric machine according to Embodiment 3, four rows of flow paths are provided. Figure 6 It is a schematic diagram showing a housing of a rotating electrical machine according to a third embodiment.

[0120] like Figure 6As shown, a first main wall 2131, a second main wall 2132, and a third main wall 2133 are provided on the outer peripheral surface of the frame body 210, and ribs 214, 215, and 216 as auxiliary walls are provided between the first partition wall 211 and the first main wall 2131. In addition, ribs 217, 218, and 219 as auxiliary walls are provided between the first main wall 2131 and the second main wall 2132. In addition, ribs 220, 221, and 222 as auxiliary walls are provided between the second main wall 2132 and the third main wall 2133. In addition, ribs 223, 224, and 225 as auxiliary walls are provided between the third main wall 2133 and the second partition wall 212.

[0121] The first flow path 281 is formed between the second partition wall 212 and the third main wall 2133, the second flow path 282 is formed between the third main wall 2133 and the second main wall 2132, the third flow path 283 is formed between the second main wall 2132 and the first main wall 2131, and the fourth flow path 284 is formed between the first main wall 2131 and the first partition wall 211. The refrigerant inlet 33 is provided in the housing 30 at a position corresponding to the first flow path 281, and the refrigerant outlet 34 is provided in the housing 30 at the same position of the refrigerant inlet 33 and the circumferential direction of the frame body 210 and at a position corresponding to the fourth flow path 284.

[0122] The first rib openings of the ribs 223, 224, 225 that are open toward the axial direction of the frame are formed at positions opposite to the refrigerant inlet portion 33. The second rib openings of the ribs 223, 224, 225 that are open toward the axial direction of the frame, the main wall opening of the third main wall 2133 that is open toward the axial direction of the frame, and the second rib openings of the ribs 220, 221, 222 that are open toward the axial direction of the frame are respectively formed on the opposite side of the frame body 210 relative to the refrigerant inlet portion 33 in the circumferential direction.

[0123] Another second rib opening portion of the ribs 220, 221, 222 that opens axially toward the frame, a main wall opening portion of the second main wall 2132 that opens axially toward the frame, and a second rib opening portion of the ribs 217, 218, 219 that opens axially toward the frame are respectively formed at circumferential positions of the frame body 210 where the refrigerant inlet portion 33 and the refrigerant outlet portion 34 are provided.

[0124] The other second rib openings of the ribs 217, 218, 219 that are open toward the axial direction of the frame, the main wall openings of the first main wall that are open toward the axial direction of the frame, and the second rib openings of the ribs 214, 215, 216 that are open toward the axial direction of the frame are respectively formed on the opposite side of the frame body 210 relative to the refrigerant inlet portion 33 and the refrigerant outlet portion 34 in the circumferential direction. The first rib openings of the ribs 214, 215, 216 that are open toward the axial direction of the frame are formed at positions opposite to the refrigerant outlet portion 34.

[0125] Here, the first rib opening has the same structure as the first rib opening in Embodiment 1, the second rib opening has the same structure as the second rib opening in Embodiment 1, and the main wall opening has the same structure as the main wall opening in Embodiment 1. Ribs 217, 218, 219 and ribs 220, 221, 223 do not include the first rib opening, and the second rib openings are provided at two locations, with one second rib opening and the other rib opening existing on opposite sides of each other in the circumferential direction.

[0126] In the rotating electric machine according to embodiment 3 constructed as described above, the refrigerant supplied from the refrigerant inlet portion 33 to the first rib openings of the ribs 223, 224, and 225 by an externally arranged pump (not shown) is branched along the circumference of the frame body 210 in the first flow path 281 with the first rib opening as the starting point, and flows through half the circumference of the outer circumferential surface of the frame body 210 respectively, and converges at the second rib openings of the ribs 223, 224, and 225.

[0127] The refrigerant of the first flow path 281 that converges at the second rib openings of the ribs 223, 224, and 225 flows along the axial direction of the frame body through the main wall openings arranged in the third main wall 2133 and reaches a second rib opening of the ribs 220, 221, and 222 in the second flow path 282. Starting from the second rib opening, the refrigerant is divided along the circumferential direction of the frame body 210 in the second flow path 282, flows through half of the outer circumferential surface of the frame body 210 respectively, and converges at another second rib opening of the ribs 220, 221, and 222.

[0128] The refrigerant in the second flow path 282 that converges at the other rib opening of the ribs 220, 221, 222 flows along the axial direction of the frame through the main wall opening of the second main wall 2132 and reaches a second rib opening of the ribs 217, 218, 219 in the third flow path 283, and diverges along the circumferential direction of the frame body 210 in the third flow path 283 with the second rib opening as the starting point, and flows through half the circumference of the outer circumferential surface of the frame body 210 respectively, and converges at the other second rib opening of the ribs 217, 218, 219.

[0129] The refrigerant in the third flow path 283 that converges at another rib opening of the ribs 217, 218, 219 flows along the axial direction of the frame through the main wall opening of the first main wall 2131 and reaches the second rib opening of the ribs 214, 215, 216 in the fourth flow path 284. Starting from the second rib opening, the refrigerant is divided along the circumferential direction of the frame body 210 in the fourth flow path 284, flows through half of the outer circumferential surface of the frame body 210 respectively, and converges at the first rib opening of the ribs 214, 215, 216.

[0130] The refrigerant that converges at the first rib openings of the ribs 214, 215, and 216 flows out from the refrigerant outlet 34 to the outside, is cooled by, for example, a cooling device (not shown), and is supplied to the third flow path 283 again from the refrigerant inlet 33 by a pump. By circulating the refrigerant in the rotating electrical machine as described above, the stator of the rotating electrical machine is cooled, and the rotating electrical machine as a whole is cooled.

[0131] According to the rotating electrical machine of the third embodiment described above, the same effects as those of the rotating electrical machine of the first embodiment described above can be obtained.

[0132] Implementation 4

[0133] Next, a rotating electrical machine according to a fourth embodiment will be described. Fig. 7A is a perspective view showing a frame of a rotating electrical machine according to a fourth embodiment, Figure 7B is from Fig. 7A This is a side view of the housing of the rotating electrical machine according to Embodiment 4 as viewed from the direction of arrow B. Fig. 7A , Figure 7B In the figure, an intermediate wall 300 is provided on the outer peripheral surface portion of the frame body 210 and extends along the axial direction of the frame body in the circumferential center portion of each of the main wall opening portion 213a of the main wall 213, the second rib opening portion 219b of the rib 219, the second rib opening portion 218b of the rib 218, the second rib opening portion 217b of the rib 217, the second rib opening portion 216b of the rib 216, the second rib opening portion 215b of the rib 215 and the second rib opening portion 214b of the rib 214.

[0134] The intermediate wall 300 is connected to the side surfaces of the first partition wall 211 and the second partition wall 212. The height dimension of the intermediate wall 300 from the outer peripheral surface of the frame body 210 is the same as the height dimension of each rib, and the other structures are the same as those of the rotating electrical machine of the first embodiment.

[0135] By providing the intermediate wall 300, the refrigerant can be effectively directed toward the outlet of the openings in the second rib openings 217b, 218b, 219b, 216b, 215b, 214b of each rib where the refrigerant diverted circumferentially from the refrigerant inlet 33 converges, and in the main wall opening 213a. Therefore, the disorder of the streamlines of the refrigerant can be suppressed, the cooling performance can be improved by increasing the flow rate of the refrigerant, and the miniaturization of the pump can be achieved by reducing the pressure loss.

[0136] Figure 8 1 is an explanatory diagram showing a modified example of the frame of the rotating electrical machine according to the fourth embodiment. Figure 8As shown, an inclined surface 300a extending in the axial direction and circumferential direction of the frame is provided at the connection between the intermediate wall 300 and the second partition wall 212. In addition, an inclined surface 300b extending in the axial direction and circumferential direction of the frame is provided at the connection between the intermediate wall 300 and the first partition wall 211.

[0137] exist Figure 8 , a portion enclosed by a dotted line around the connection between the intermediate wall 300 and the second partition wall 212 is enlarged in FIG H. Thus, by providing the inclined surface 300a at the connection between the intermediate wall 300 and the second partition wall 212, and providing the inclined surface 300b at the connection between the intermediate wall 300 and the first partition wall 211, the change of these inclined surfaces from the circumferential flow of the refrigerant to the axial flow is smoothed, the streamline of the cooling refrigerant can be stabilized, the cooling performance can be improved by increasing the flow rate of the refrigerant, and the miniaturization of the pump can be achieved by reducing the pressure loss.

[0138] This application records various illustrative embodiments and examples, but the various features, methods and functions recorded in one or more embodiments are not limited to application to specific embodiments, and can be applied to the embodiments alone or in various combinations. Therefore, countless variations that are not exemplified are envisioned within the technical scope disclosed in this application. For example, it includes the case where at least one constituent element is deformed, added or omitted, and also includes the case where at least one constituent element is extracted and combined with constituent elements of other embodiments.

Claims

1. A rotating electrical machine, comprising: a stator, wherein the stator encloses the rotor inside; a frame having the stator fitted in an inner peripheral surface portion of the frame; and a housing configured to cover an outer peripheral surface of the frame, The frame includes a first partition wall and a second partition wall arranged on the outer peripheral surface portion at a distance therebetween in the axial direction of the frame. The rotating motor is configured to allow the refrigerant to flow from a refrigerant inlet portion provided in the housing to a space portion formed between the housing and the frame, and to allow the refrigerant flowing into the space portion to flow out of the space portion from a refrigerant outlet portion provided in the housing, characterized in that: The frame comprises: a main wall provided on the outer peripheral surface portion of the frame body and dividing the space portion along the axial direction to form a plurality of flow paths; and ribs, the ribs are respectively arranged on the plurality of flow paths and extend along the circumference of the frame, The main wall includes a main wall opening portion opening toward the axial direction, The rib includes a rib opening portion opened toward the axial direction, The main wall opening and the rib opening are arranged opposite to each other in the axial direction. The frame includes an intermediate wall extending along the axial direction at the main wall opening and the rib opening, wherein the intermediate wall is connected to the first partition wall and the second partition wall. The intermediate wall includes an inclined surface portion at the connection portion with the first partition wall, which extends along the axial and circumferential directions of the frame and becomes wider as it approaches the first partition wall, and includes an inclined surface portion at the connection portion with the second partition wall, which extends along the axial and circumferential directions of the frame and becomes wider as it approaches the second partition wall.

2. The rotating electrical machine according to claim 1, characterized in that The width of the main wall opening in the circumferential direction is larger than the width of the rib opening in the circumferential direction.

3. The rotating electrical machine according to claim 2, characterized in that The frame comprises a main wall, A plurality of the ribs and the rib openings are arranged at intervals from each other in the axial direction. The rib opening portion provided in the rib closer to the one main wall has a circumferential width greater than the circumferential width of the rib opening portion provided in the rib farther from the one main wall.

4. The rotating electrical machine according to any one of claims 1 to 3, characterized in that One of the plurality of flow paths is arranged at a position corresponding to the refrigerant inlet portion, Another flow path among the plurality of flow paths is arranged at a position corresponding to the refrigerant outlet portion, The rib provided in the flow path at a position corresponding to the refrigerant inlet includes a rib opening different from the rib opening of the rib itself at the position corresponding to the refrigerant inlet. The rib provided in the flow path arranged at a position corresponding to the refrigerant outlet portion includes a rib opening portion different from the rib opening portion of the rib itself at the position corresponding to the refrigerant outlet portion.

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