Rotating electric machine

Abstract

A stator of a rotating electrical machine includes a stator core having first and second core blocks disposed adjacent to each other in an axial direction, and coils disposed in a plurality of slots. A plurality of first flow channels and a plurality of second flow channels penetrating the first and second iron core blocks in the axial direction are alternately arranged on the first and second iron core blocks at predetermined angles in the circumferential direction. The first and second iron core blocks are configured such that the plurality of first flow channels of the first iron core block are in communication with the plurality of second flow channels of the second iron core block, and the plurality of second flow channels of the first iron core block are in communication with the plurality of first flow channels of the second iron core block.

Description

Technical Field

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

[0002] Conventionally, there is a known technique for cooling by dropping a refrigerant from above the stator core. Such a technique is described, for example, in Patent Document 1. In Patent Document 1, a plurality of refrigerant guide vanes extending in the axial direction are provided on the outer peripheral surface of the stator core, and the refrigerant dropped onto the outer peripheral surface of the stator core and flows down along the outer peripheral surface flows in the axial direction of the stator by means of the plurality of refrigerant guide vanes and is guided to the coil end.

[0003] However, the technology described in Patent Document 1 is a structure in which a refrigerant is dripped onto the outer peripheral surface of the stator for cooling, and therefore it is difficult to ensure sufficient cooling performance for the coil.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2015-115994 (JP 2015-115994 A). Summary of the invention

[0007] A rotating electric machine according to one technical solution of the present invention comprises a rotor and a stator having a plurality of slots arranged in the circumferential direction. The stator comprises a stator core and a coil, wherein the stator core comprises a first core block and a second core block arranged adjacent to each other in the axial direction, wherein the coil is arranged in a plurality of slots, wherein a plurality of first flow channels and a plurality of second flow channels are arranged alternately at predetermined angles in the circumferential direction in the first core block and the second core block, respectively, wherein the plurality of first flow channels and the plurality of second flow channels penetrate the first core block and the second core block in the axial direction, respectively, and the first core block and the second core block are arranged such that the plurality of first flow channels of the first core block are connected to the plurality of second flow channels of the second core block, and the plurality of second flow channels of the first core block are connected to the plurality of first flow channels of the second core block. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The objects, features and advantages of the present invention will be further clarified through the following description of the embodiments in conjunction with the accompanying drawings.

[0009] Figure 1 It is a front view showing the main part structure of the rotating electrical machine according to the first embodiment of the present invention.

[0010] Figure 2 It is a side view showing the main part structure of the rotating electrical machine according to the first embodiment of the present invention.

[0011] Figure 3 This is a front view of a stacked body of a pair of core blocks.

[0012] Figure 4 yes Figure 3 Front view of one of the core blocks.

[0013] Figure 5 yes Figure 3 Front view of another core block in the figure.

[0014] Figure 6 This is a front view of a core block arranged at an axial end of the stator core.

[0015] Figure 7 is along Figure 3 A cross-sectional view of the stator core taken along line D1-D1.

[0016] Figure 8 As Figure 3 A front view of a stack of a pair of core blocks according to a modified example.

[0017] Fig. 9 yes Figure 8 Front view of an iron core block.

[0018] Fig.10 is along Figure 8 A cross-sectional view of the stator core taken along line D2-D2.

[0019] Fig.11 This is a diagram showing an example of magnetic flux density distribution when no refrigerant flow path is provided in the stator core.

[0020] Fig. 12A This is a diagram showing the magnetic flux density distribution of one core block among a pair of core blocks as a comparative example of the first embodiment of the present invention.

[0021] Fig. 12B It is a diagram showing the magnetic flux density distribution of the other core block of a pair of core blocks as a comparative example of the first embodiment of the present invention.

[0022] Fig.13 It is a front view of one core block as a comparative example of the first embodiment of the present invention.

[0023] Fig.14 It is a front view of another core block as a comparative example of the first embodiment of the present invention.

[0024] Fig.15 is shown with Figure 8 , 9 Diagram of the magnetic flux density distribution corresponding to the core block.

[0025] Fig.16 1 is a diagram showing the relationship between the position of the region where the refrigerant flow paths communicate with each other and the torque improvement rate in the first embodiment.

[0026] Fig.17 It is a front view of a stacked body of a pair of core blocks included in a rotating electrical machine according to a second embodiment of the present invention.

[0027] Fig.18 yes Fig.17 Front view of one of the core blocks.

[0028] Fig.19 yes Fig.17 Front view of another core block in the figure.

[0029] Fig. 20 is along Fig.17 A cross-sectional view of the stator core taken along line D3-D3.

[0030] Fig.21 is shown as Fig.17 A front view of a stack of a pair of core blocks according to a modified example.

[0031] Fig. 22 yes Fig.21 Front view of one of the core blocks.

[0032] Fig.23 yes Fig.21 Front view of another core block in the figure.

[0033] Fig.24 As Fig. 22 , 23 A front view of a core block of a comparative example.

[0034] Fig.25 1 is a diagram showing the relationship between the position of the region where the refrigerant flow paths communicate with each other and the torque improvement rate according to the second embodiment.

[0035] Fig.26 It is shown Fig. 22 FIG. 1 is a diagram of a modified example of .

[0036] Fig. 27 It is shown Fig. 22 , 23 Diagram of the magnetic flux density distribution of the core block.

[0037] Fig.28 It is shown Fig.26 Diagram of the magnetic flux density distribution of the core block.

[0038] Fig.29 is shown fixed with Figure 1 , 2 Diagram of different stator arrangements.

[0039] Fig.30 yes Fig.29 A front view of a stack of a pair of core blocks.

[0040] Fig.31 yes Fig.30 Front view of one of the core blocks.

[0041] Fig.32 yes Fig.30 Front view of another core block in the figure.

[0042] Fig.33 It is configured in Fig.29 A front view of the core block at the axial end of the stator core.

[0043] Fig.34 It is along Fig.30 A cross-sectional view of the stator core taken along line D4-D4. DETAILED DESCRIPTION

[0044] First embodiment

[0045] Below, refer to Figures 1 to 16 A first embodiment of the present invention will be described. Figure 1 1 is a front view showing a main part structure of a rotating electrical machine 1 according to an embodiment of the present invention. Figure 2 1 is a side view showing the structure of the main part of the rotating electrical machine 1. Below, as shown in the figure, three mutually orthogonal axes are defined as the X-axis, the Y-axis, and the Z-axis, and the structure of each part is described using these X-axis, Y-axis, and Z-axis. The Z-axis is equivalent to the axial direction along the center line (axis line CL1) of the rotating electrical machine 1. The Y-axis is equivalent to the gravity direction. The direction extending radially from the axis line CL1 is the radial direction, and the direction along the circle centered on the axis line CL1 is the circumferential direction.

[0046] like Figure 1 As shown, the rotary electric machine 1 includes a housing 4, a stator 2 having a substantially annular shape with the axis CL1 as the center and arranged in the housing 4, and a rotor 3 arranged radially inside the stator 2. The stator 2 includes: a stator core 20, which is formed by stacking a plurality of electromagnetic steel sheets in the axial direction; and a stator coil 21, which is accommodated in a plurality of grooves 201 provided in the circumferential direction on the inner peripheral surface of the stator core 20. A refrigerant inlet portion 42 for introducing refrigerant into the housing is provided at the top of the housing 4. A through hole 420 penetrating the housing 4 in the Y direction is formed in the refrigerant inlet portion 42. The coil conductor used for the stator coil 21 is, for example, a flat wire having a rectangular cross section. The coil conductor is not limited to a flat wire, but may also be a round wire having a circular cross section.

[0047] Figure 2 The cross-sectional shape of the housing 4 and the shape of the outer peripheral surface of the stator core 20 are shown. Figure 2As shown, the stator core 20 has four core blocks 200A, 200B, 210, 210 stacked in the axial direction. The four core blocks are arranged in the order of core block 210, core block 200A, core block 200B, and core block 210. The core blocks 200A, 200B, and 210 are formed by stacking a plurality of electromagnetic steel plates in the axial direction. A refrigerant flow channel 421 in the shape of an annulus is formed between the inner circumferential surface of the housing 4 and the outer circumferential surface of the core blocks 200A and 200B with the axis CL1 as the center. The through hole 420 of the refrigerant inlet 42 is connected to the refrigerant flow channel 421.

[0048] Figure 3 FIG. 2 is a front view of a stack of core blocks 200A and 200B. Figure 3 In the figure, the core block 200A is arranged on the front side, and the core block 200B is arranged on the rear side. The core block 200A and the core block 200B have the same shape. That is, the core block 200A and the core block 200B are formed by stacking electromagnetic steel plates of the same shape. As described later, the core block 200B is rotated (rotationally stacked) by a predetermined angle θ (refer to Figure 5 The grooves 201 are arranged at predetermined angles θ, that is, at predetermined groove pitches in the circumferential direction.

[0049] The core blocks 200A and 200B are formed with three types of refrigerant flow paths 202, 203, and 204. The refrigerant flow paths 202 to 204 indicated by solid lines are formed in the core block 200A, and the refrigerant flow paths 202 to 204 indicated by dotted lines are formed in the core block 200B.

[0050] Figure 4 yes Figure 3 Front view of the core block 200A in FIG. As described above, a plurality of refrigerant channels 202, a plurality of refrigerant channels 203, and a plurality of refrigerant channels 204 are formed in the core block 200A. The refrigerant channel 202 extends radially from the outer peripheral surface 211 of the core block 200A, and an opening is provided on the outer peripheral surface 211. The radially inner end of the refrigerant channel 202 extends to an annular region E1 centered on the axis CL1. The refrigerant channel 203 extends radially from the region E1 to an annular region E2 centered on the axis CL1 near the groove 201 on its radial inner side. The refrigerant channels 202 and 203 are provided to penetrate the core block 200A in the axial direction. The refrigerant channel 204 arranged in the region E2 extends in the axial direction and penetrates the core block 200A.

[0051] exist Figure 4In the example shown, the refrigerant flow channels 202 and the refrigerant flow channels 203 are alternately arranged in the circumferential direction at intervals of a predetermined angle θ, that is, at a pitch angle θ that is the same as the slot pitch, throughout the entire circumference of the core block 200A. The refrigerant flow channels 202 and 203 are arranged in the circumferential direction at intervals of a predetermined angle 2θ, respectively. The refrigerant flow channels 204 are arranged in the circumferential direction at intervals of a predetermined angle 2θ. The circumferential positions of the plurality of refrigerant flow channels 204 are the same as the circumferential positions of the plurality of refrigerant flow channels 202.

[0052] Figure 5 yes Figure 3 The front view of the core block 200B in FIG. Figure 5 As shown, the shape of the core block 200B is similar to Figure 4 The shape of the core block 200A is exactly the same. However, the core block 200A and the core block 200B are arranged differently in the circumferential direction. That is, compared with the core block 200A, the core block 200B is arranged so that the positions of the plurality of refrigerant flow channels 202 are offset by a predetermined angle θ in the clockwise direction. Therefore, for example Figure 4 The refrigerant flow path 202 at the symbol A position becomes Figure 5 When the core block 200A is stacked with the core block 200B, the core block 200B is rotated in the circumferential direction at a predetermined angle θ relative to the core block 200A. Figure 4 The 0° position and Figure 5 The core blocks 200B are stacked on the core blocks 200A so that the 0° positions of the core blocks 200A are aligned.

[0053] like Figure 3 As shown in the figure, when the core block 200A and the core block 200B are stacked, the radial inner end of the refrigerant flow channel 202 of the core block 200A and the radial outer end of the refrigerant flow channel 203 of the core block 200B are axially opposed. As a result, the refrigerant flow channel 202 of the core block 200A is connected to the refrigerant flow channel 203 of the core block 200B. In addition, the radial inner end of the refrigerant flow channel 202 of the core block 200B and the radial outer end of the refrigerant flow channel 203 of the core block 200A are axially opposed, and the refrigerant flow channels 202 and 203 are connected.

[0054] At this time, the radial inner end of the refrigerant flow channel 203 of the core block 200A is axially opposed to the refrigerant flow channel 204 of the core block 200B. In addition, the radial inner end of the refrigerant flow channel 203 of the core block 200B is axially opposed to the refrigerant flow channel 204 of the core block 200A. As a result, the refrigerant flow channel 203 of the core block 200A is connected to the refrigerant flow channel 204 of the core block 200B, and the refrigerant flow channel 203 of the core block 200B is connected to the refrigerant flow channel 204 of the core block 200A.

[0055] Figure 6 It is arranged at the axial end of the stator core 20. Figure 2 A front view of the core block 210. Figure 1 , 2 As shown, the outer diameter of the core block 210 is larger than that of the core blocks 200A and 200B. The core block 210 is embedded and fixed on the inner circumference of the housing 4. Figure 6 As shown, in the core block 210, the refrigerant flow passages 204 are formed at the same positions in the radial direction and the circumferential direction as the refrigerant flow passages 204 of the adjacent core blocks 200A and 200B. Therefore, a plurality of refrigerant flow passages 204 are arranged in the core block 210 at intervals of a predetermined angle θ in the circumferential direction.

[0056] Figure 7 is along Figure 3 A cross-sectional view of the stator core 20 cut along the D1-D1 line. Figure 7 In addition to the core blocks 200A and 200B, a pair of core blocks 210 and a stator coil 21 are also shown. Figure 7 As shown, the radial inner end of the refrigerant flow channel 202 of the core block 200B is opposite to the radial outer end of the refrigerant flow channel 203 of the core block 200A. The refrigerant flow channel 204 of the core block 200B and the refrigerant flow channel 204 of the core block 210 adjacent to the core block 200A are respectively opposite to the radial inner end of the refrigerant flow channel 203 of the core block 200A. The refrigerant flow channel 204 of the core block 200B is opposite to the refrigerant flow channel 204 of the core block 210 adjacent to the core block 200B.

[0057] exist Figure 7 In FIG. 1 , arrows are used to indicate the flow of the refrigerant. The refrigerant supplied from the outside passes through Figure 1 The refrigerant flows into the annular refrigerant flow channel 421 between the shell 4 and the core blocks 200A and 200B through the through hole 420 of the shell 4. After the refrigerant in the refrigerant flow channel 421 flows into the refrigerant flow channel 202 of the core block 200B, it flows out from the axially outer end faces of a pair of core blocks 210 through the refrigerant flow channels 203 and 204 and flows to the coil ends. In this way, the stator core 20 can be well cooled by the refrigerant flowing inside the core blocks 200A, 200B, and 210. Furthermore, the stator coil 21 arranged in the slot 201 can be cooled via the stator core 20.

[0058] Figure 8 FIG. 2 is a front view of a stack of core blocks 200C and 200D as a modified example of the core blocks 200A and 200B. Figure 8In the figure, the core block 200C is arranged on the front side, and the core block 200D is arranged on the rear side. The core block 200C and the core block 200D have the same shape. The refrigerant flow channels 202 and 203 shown by the solid line in the figure are formed in the core block 200C, and the refrigerant flow channels 202 and 203 shown by the dotted line are formed in the core block 200D.

[0059] Fig. 9 yes Figure 8 Front view of the core block 200C in FIG. In the core block 200C, a plurality of refrigerant flow channels 202 and 203 are alternately arranged at predetermined angles θ in the circumferential direction. The circumferential positions of the refrigerant flow channels 202 and 203 of the core block 200C are the same as the circumferential positions of the grooves 201. Figure 4 Similarly, the refrigerant flow channel 202 of the core block 200A extends radially from the outer peripheral surface 211 of the core block 200C, and its radial inner end extends to the annular region E1 centered on the axis CL1. The refrigerant flow channel 203 extends from the region E1 to the groove 201 radially inside thereof, and the radial inner end of the refrigerant flow channel 203 is connected to the groove 201.

[0060] When the core block 200C is stacked with the core block 200D, Figure 8 As shown, the core block 200D is stacked on the core block 200C in a state where the core block 200D is rotated by a predetermined angle θ in the circumferential direction relative to the core block 200C. In the stacked state of the core blocks 200C and 200D, the radial inner end of the refrigerant flow channel 202 of the core block 200C and the radial outer end of the refrigerant flow channel 203 of the core block 200D are axially opposed. In addition, the radial inner end of the refrigerant flow channel 202 of the core block 200D and the radial outer end of the refrigerant flow channel 203 of the core block 200C are opposed. As a result, the refrigerant flow channel 202 of the core block 200C is connected to the refrigerant flow channel 203 of the core block 200D, and the refrigerant flow channel 203 of the core block 200C is connected to the refrigerant flow channel 202 of the core block 200D.

[0061] Fig.10 is along Figure 8 A cross-sectional view of the stator core 20 cut along the D2-D2 line. Fig.10 In addition to the core blocks 200C and 200D, a pair of core blocks 210 and a stator coil 21 are also shown. Fig.10 As shown, the radially outer end of the refrigerant flow channel 203 of the core block 200C faces the radially inner end of the refrigerant flow channel 202 of the core block 200D. In addition, the radially inner end of the refrigerant flow channel 203 of the core block 200C communicates with the groove 201.

[0062] like Fig.10As shown by the middle arrow, the refrigerant supplied from the outside to the annular refrigerant flow channel 421 flows into the refrigerant flow channel 202 of the core block 200D, and then flows into the groove 201 through the refrigerant flow channel 203 of the core block 200C. The refrigerant flowing into the groove moves in the axial direction through the gap in the groove 201 and flows toward the coil end. In this way, the refrigerant not only flows in the core blocks 200C and 200D, but is also introduced into the groove 201, so the stator coil 21 can be directly cooled by the refrigerant. As a result, the cooling efficiency can be further improved.

[0063] However, if a refrigerant flow path is formed in the stator core, the magnetic flux density distribution changes, and the torque decreases compared to a case where there is no refrigerant flow path. Fig.11 2 is a diagram showing an example of magnetic flux density distribution when the stator core 20 is not provided with a refrigerant flow path. Fig.11 3 and a part of the stator 2 are shown, and lines 500 (hereinafter referred to as magnetic flux lines) representing magnetic flux density are shown. The number of magnetic flux lines 500 per unit volume represents the magnitude of the magnetic flux density, and the magnetic flux density is represented by the aggregation of the magnetic flux lines 500 and the direction in which the magnetic flux lines 500 extend. Fig.11 In the example shown, considering the number of magnetic flux lines 500 , the magnetic flux density of region F1 is greater than the magnetic flux density of region F2 .

[0064] Fig. 12A , Fig. 12B The diagrams show magnetic flux density distributions (distributions of magnetic flux lines 500 ) when the refrigerant flow paths 202 and 203 are formed in the core blocks 300A and 300B as comparative examples of the present embodiment. Fig.13 , 14 They are front views of the core blocks 300A and 300B respectively. Fig.13 As shown in FIG. 1 , a plurality of refrigerant flow paths 202 are formed in the core block 300A at predetermined angles θ in the circumferential direction. The circumferential positions of the refrigerant flow paths 202 are the same as the circumferential positions of the grooves 201. Fig.14 As shown, a plurality of refrigerant flow channels 203 communicating with the groove 201 are formed in the core block 300B at predetermined angles θ in the circumferential direction. When the core block 300B is stacked on the core block 300A, the radial inner end of the refrigerant flow channel 202 and the radial outer end of the refrigerant flow channel 203 are axially opposed, and the refrigerant flow channels 202 and the refrigerant flow channels 203 are communicated.

[0065] Fig. 12A shows the magnetic flux density distribution in the core block 300A, Fig. 12B 300B shows the magnetic flux density distribution in the core block 300B. Fig. 12AAs shown, in the core block 300A, the refrigerant flow path 202 extending in the radial direction hinders the flow of the magnetic flux lines 500, and the magnetic flux lines 500 are almost invisible in the region indicated by the symbol F3 of the back yoke (core portion radially outside the slots 201). As a result, the torque is greatly reduced.

[0066] Fig.15 The figure shows the core blocks 200C and 200D ( Figure 8 , 9 ) is a graph showing the magnetic flux density distribution corresponding to the core blocks 200C and 200D. Since the shapes of the core blocks 200C and 200D are the same, the magnetic flux density distributions are also the same. Fig. 9 As shown in FIG. 2 , the refrigerant flow passages 202 on the radially outer side and the refrigerant flow passages 203 on the radially inner side provided in the back yoke of the core block 200C are alternately arranged in the circumferential direction at intervals of a predetermined angle θ. Fig.15 As shown, the magnetic flux lines 500 are distributed throughout the back yoke, which is different from the comparative example ( Fig. 12A , Fig. 12B ) compared to the previous example, the suppression torque is reduced.

[0067] Although not shown in the figure, the core blocks 200A and 200B ( Figure 2 , 3 ) also becomes the same magnetic flux density distribution as that of the core blocks 200C and 200D, which can suppress the torque reduction. Figure 6 In the core block 210 , since the refrigerant flow path 204 is formed only in the vicinity of the groove 201 , the torque reduction can be further suppressed compared with the core blocks 200A and 200B.

[0068] like Figure 8 As shown, the radial inner end of the refrigerant flow channel 202 of the core block 200C and the radial outer end of the refrigerant flow channel 203 of the core block 200D, and the radial inner end of the refrigerant flow channel 202 of the core block 200D and the radial outer end of the refrigerant flow channel 203 of the core block 200C are in the annular area E1 (refer to Fig. 9 ) are axially opposed in the radial direction. The radial position of the region E1 is defined by an offset ΔR based on the radial center position of the back yoke. If the outer diameter of the core blocks 200C and 200D is set to R1, and the distance from the axis CL1 to the bottom (radially outer end) of the slot 201 is set to R2, the radial center position of the back yoke is (R1+R2) / 2. When the region E1 is located at the radial center position of the back yoke, ΔR=0, when it is located radially outward of the radial center position, ΔR>0, and when it is located radially inward, ΔR<0.

[0069] Fig.16 The position of the area E1 where the refrigerant flow paths 202 and 203 are connected is shown in FIG. Fig.13 , 14 The characteristic L1 shown by the dotted line represents the torque improvement rate of the comparative example, and the characteristic L2 shown by the solid line represents the torque improvement rate of the comparative example. Figure 8 , 9 The torque increase rate when the core blocks are 200C and 200D. Fig.16 In the figure, the torque improvement rate is shown with the case of ΔR=0 in the comparative example as the reference (0%). As shown in characteristic L1, in the comparative example, the degree of torque reduction is the smallest (0%) when ΔR=0. Then, in region E1, as ΔR=0 approaches the radial inner side and the radial outer side, the torque improvement rate decreases and the degree of torque reduction increases.

[0070] exist Figure 8 , 9 In the case of the core blocks 200C and 200D shown in the figure, as shown in the characteristic L2, when ΔR = 0, the torque improvement rate is the largest, and the torque improvement rate decreases as the region E1 approaches the radial inner side and the radial outer side from ΔR = 0. However, in the characteristic L2, unlike the characteristic L1, the torque improvement rate is a positive value when the region E1 deviates radially outward or radially inward.

[0071] As described above, in the first embodiment and the modified example, the refrigerant flow paths 202 to 204 are formed in the core blocks 200A, 200B and the core blocks 200C, 200D of the stator core 20. As a result, the cooling performance of the stator core 20 and the stator coil 21 can be improved, and the torque reduction caused by the provision of the refrigerant flow paths 202 to 204 can be suppressed. Figure 2 , 6 As shown in FIG. 7 , by the stator core 20 including the core block 210 formed with only the flow passage 204 , the torque reduction can be further suppressed.

[0072] Second embodiment

[0073] Reference Figures 17-28 A second embodiment of the present invention will be described. Fig.17 It is a front view of a stacked body of core blocks 200E and 200F included in the rotating electrical machine 1 according to the second embodiment of the present invention. Fig.18 This is the front view of the core block 200E. Fig.19 This is a front view of the core block 200F. Fig.17 In the figure, the core block 200E is arranged on the front side, and the core block 200F is arranged on the rear side.

[0074] like Fig.18As shown, a plurality of refrigerant channels 203 extending in the radial direction, a plurality of refrigerant channels 204 in the circumferential direction, and a plurality of refrigerant channels 205 extending in the circumferential direction are provided in the core block 200E. These refrigerant channels 203 to 205 extend in the axial direction and penetrate the core block 200E. Moreover, one of the plurality of refrigerant channels 205 in the circumferential direction (for example, the refrigerant channel 205 at the top) is provided with a refrigerant inlet passage 206 extending in the radial direction to the outer peripheral surface 211 of the core block 200E. In the core block 200E, 18 grooves 201 are provided at intervals of a specified angle θ in the circumferential direction. The specified angle θ is 20°. In the annular region E1 centered on the axis CL1, three refrigerant channels 205 are provided at equal intervals in the circumferential direction. The refrigerant channels 205 are provided at a specified angle 3θ extending at intervals of a specified angle 3θ.

[0075] In the region between the adjacent refrigerant flow paths 205 and 205 in the circumferential direction of the core block 200E, three refrigerant flow paths 203 are provided at intervals of a predetermined angle θ. Figure 4 Similarly, the refrigerant flow channel 203 extends from the annular region E1 to the annular region E2 radially inwardly centered on the axis CL1. In the region E2 radially inwardly of the refrigerant flow channel 205 of the core block 200E, three refrigerant flow channels 204 are provided at intervals of a predetermined angle θ. The refrigerant flow channel 204 is arranged between the grooves 201, 201 adjacent in the circumferential direction. The refrigerant flow channel 203 is also arranged between the grooves 201, 201 adjacent in the circumferential direction. Therefore, in the region E2 of the core block 200E, three refrigerant flow channels 203 and three refrigerant flow channels 204 are alternately arranged in the circumferential direction at intervals of a predetermined angle 3θ.

[0076] like Fig.19 As shown in FIG. 2 , unlike the core block 200E, the core block 200F is not provided with a refrigerant introduction path 206. In addition, the core block 200F is configured in the same manner as the core block 200E. The core block 200F is arranged to be rotated clockwise by a predetermined angle 3θ with respect to the core block 200E around the axis CL1. Fig.17 As shown, the core blocks 200E and 200F are stacked.

[0077] like Fig.17 As shown, in the state where the core blocks 200E and 200F are stacked, the circumferential end of the refrigerant flow channel 205 of the core block 200E overlaps the circumferential end of the refrigerant flow channel 205 of the core block 200F. As a result, the refrigerant flow channel 205 of the core block 200E is connected to the refrigerant flow channel 205 of the core block 200F, and a generally annular flow channel is formed in the core blocks 200E and 200F.

[0078] In addition, the refrigerant flow channel 205 of the core block 200E is opposed to the radially outer end of the refrigerant flow channel 203 of the core block 200F, and the radially inner end of the refrigerant flow channel 203 of the core block 200F is opposed to the refrigerant flow channel 204 of the core block 200E. The refrigerant flow channel 205 of the core block 200F is opposed to the radially outer end of the refrigerant flow channel 203 of the core block 200E, and the radially inner end of the refrigerant flow channel 203 of the core block 200E is opposed to the refrigerant flow channel 204 of the core block 200F.

[0079] Fig. 20 is along Fig.17 A cross-sectional view of the stator core 20 cut along the line D3-D3. Fig. 20 In addition to the core blocks 200E and 200F, a pair of core blocks 210 and a stator coil 21 are also shown. Fig. 20 As shown, the refrigerant flow channel 205 of the core block 200E is opposed to the radially outer end of the refrigerant flow channel 203 of the core block 200F. The refrigerant flow channel 204 of the core block 200E and the refrigerant flow channel 204 of the core block 210 adjacent to the core block 200F are opposed to the radially inner end of the refrigerant flow channel 203 of the core block 200F. The refrigerant flow channel 204 of the core block 210 adjacent to the core block 200E is opposed to the refrigerant flow channel 204 of the core block 200E.

[0080] The annular refrigerant flow channel 421 and the shell 4 ( Figure 1 ) is formed opposite to the inner circumference of the housing. Figure 1 ) is supplied from the outside to the refrigerant flow path 421. The refrigerant in the refrigerant flow path 421 is passed through the refrigerant introduction path 206 ( Fig.17 ) flows into the refrigerant flow channel 205. Fig. 20 As shown by the arrows, the refrigerant flowing into the refrigerant flow channel 205 passes through the refrigerant flow channel 203 of the core block 200F and the refrigerant flow channel 204 of the core blocks 200E and 210, flows out from the axially outer end faces of a pair of core blocks 210, and flows toward the coil ends.

[0081] Fig.21 FIG. 2 is a front view of a stack of core blocks 200G and 200H as a modified example of the core blocks 200E and 200F. Fig.21 In the figure, the core block 200G is arranged on the front side, and the core block 200H is arranged on the rear side. Fig. 22 This is the main view of the core block 200G. Fig.23 It is a front view of the core block 200H.

[0082] like Fig. 22As shown, the core block 200G is provided with a refrigerant flow channel 203 communicating with the groove 201 extending in the radial direction, a refrigerant flow channel 205 extending in the circumferential direction, and a refrigerant introduction path 206 extending from the refrigerant flow channel 205 in the radial direction to the outer peripheral surface 211 of the core block 200G. Fig.18 Compared with the core block 200E, the circumferential positions of the refrigerant flow paths 203 and 205 of the core block 200G are shifted in the clockwise direction by a predetermined angle θ / 2. Therefore, the circumferential position of the refrigerant flow path 203 coincides with the circumferential position of the groove 201 .

[0083] like Fig.23 As shown in FIG. 2 , unlike the core block 200G, the core block 200H is not provided with a refrigerant introduction path 206. In addition, the core block 200H is configured in the same manner as the core block 200G. The core block 200H is arranged to be rotated by a predetermined angle 3θ in the clockwise direction with respect to the core block 200G around the axis CL1. Fig.21 As shown, the core blocks 200G and 200H are stacked.

[0084] like Fig.21 As shown, in the state where the core blocks 200G and 200H are stacked, the circumferential end of the refrigerant flow channel 205 of the core block 200G overlaps with the circumferential end of the refrigerant flow channel 205 of the core block 200H. As a result, the refrigerant flow channel 205 of the core block 200G is connected with the refrigerant flow channel 205 of the core block 200H, and a flow channel that is generally annular is formed in the core blocks 200G and 200H. In addition, the refrigerant flow channel 205 of the core block 200G is opposite to the radially outer end of the refrigerant flow channel 203 of the core block 200H, and the refrigerant flow channel 205 of the core block 200H is opposite to the radially outer end of the refrigerant flow channel 203 of the core block 200G.

[0085] However, in Fig.17 In the core blocks 200E and 200F shown, three refrigerant flow channels 203 and refrigerant flow channels 205 and three refrigerant flow channels 204 are alternately arranged in the circumferential direction at predetermined angles 3θ. Therefore, by simply stacking the core block 200F at a predetermined angle 3θ relative to the core block 200E, all the refrigerant flow channels 204 can be connected to the refrigerant flow channels 205 via the refrigerant flow channels 203.

[0086] On the other hand, as Fig. 22 , 23 Comparative Example Fig.24In the core block 200J, one refrigerant flow channel 203 and one refrigerant flow channel 205 and five refrigerant flow channels 204 are alternately arranged in the circumferential direction at a predetermined angle of 5θ. In this case, in order to connect all refrigerant flow channels 204 and refrigerant flow channels 205 via the refrigerant flow channel 203, five rotation stackings are required. That is, six Fig.24 The core blocks 200J are stacked while being offset by a predetermined angle θ. Therefore, when the core blocks are arranged in the refrigerant flow passage 205 extending in the circumferential direction, as shown in FIG. Fig.17 and Fig.21 As shown, it is preferred that the circumferential flow passages (refrigerant flow passages 205) and the radial flow passages (refrigerant flow passages 203) are alternately arranged across the same angle (3θ) with respect to each other.

[0087] In a first embodiment, for example, Figure 8 , 9 As shown, the core block is constructed in such a manner that a refrigerant flow channel 202 extending in the radial direction from the outer peripheral surface 211 is provided on the back yoke of the core block, and the refrigerant supplied from the outside is guided to the refrigerant flow channel 203 on the radial inner side of the refrigerant flow channel 202 through the refrigerant flow channel 202. On the other hand, in the second embodiment, the core block is constructed in such a manner that a refrigerant flow channel 205 extending in the circumferential direction is provided on the back yoke, and the refrigerant is guided to the refrigerant flow channel 203 on the radial inner side of the refrigerant flow channel 205, thereby suppressing the reduction in torque caused by the provision of the refrigerant flow channel.

[0088] Fig.25 and Fig.16 Similarly, this is a diagram showing the relationship between the position of region E1 and the torque improvement rate. In the diagram, the case of ΔR=0 in the comparative example (a case where no refrigerant flow path is provided) is used as a reference (0%). Fig.25 The solid line in the characteristic L3 indicates the use of Fig. 22 , 23 The torque improvement rate when the core block is 200G and 200H. The characteristic L4 shown by the single-point chain line is as follows Fig.26 20K, represents the torque improvement rate when the refrigerant flow paths 203 and the refrigerant flow paths 205 are alternately arranged in the circumferential direction at every predetermined angle θ.

[0089] Fig. 27 It is shown that the use Fig. 22 , 23 Graph of the magnetic flux density distribution when the core block is 200G and 200H. Fig.28 It is shown that the use Fig.26 The magnetic flux density distribution of the core block at 200K. Fig. 27 , 28As shown, by alternately arranging the refrigerant flow passages 203 and the refrigerant flow passages 205 in the circumferential direction, a relatively good magnetic flux density distribution can be obtained. Fig.25 As shown, the torque is improved compared with the case of the comparative example.

[0090] As in the first embodiment (for example Figure 8 , 9 ), in a structure where the refrigerant flow passages 202 and 203 extending in the radial direction are alternately arranged in the circumferential direction, as shown in FIG. Fig.16 As shown in FIG. 1 , when the position where the refrigerant flow channel 202 and the refrigerant flow channel 203 are connected is located at the radial center position of the back yoke (ΔR=0), the torque improvement rate is the largest. On the other hand, as in the second embodiment, in a structure in which the refrigerant flow channel 205 extending in the circumferential direction and the refrigerant flow channel 203 extending in the radial direction are alternately arranged in the circumferential direction, as shown in FIG. Fig.25 As shown, the closer the position where the refrigerant flow channel 203 and the refrigerant flow channel 205 are connected to the radial inner end of the back yoke, the greater the torque improvement rate. Fig.25 In view of the characteristics L3 and L4, the position (region E1) where the refrigerant flow path 203 and the refrigerant flow path 205 are connected is preferably set radially inward of the radial center of the back yoke.

[0091] In the above, Figure 1 , 2 As shown, the stator 2 is fixed to the inner peripheral portion of the housing 4, but the method of fixing the stator 2 is not limited thereto. Fig.29 2 is a diagram showing other fixing methods of the stator 2. Fig.29 As shown, by stacking and Figure 2 The core blocks 200A and 200B corresponding to the core blocks 400A and 400B and Figure 2 The stator core 20 is formed by core blocks 410A and 410B corresponding to the pair of core blocks 210 .

[0092] The core blocks 410A, 400A, 400B, 410B have fastening portions 409 protruding radially outward from the outer peripheral surfaces 411 of the core blocks 410A, 400A, 400B, 410B. Through holes 408 that penetrate the core blocks 410A, 400A, 400B, 410B in the axial direction are formed in the fastening portions 409. Bolts 430 are inserted through the through holes 408 of the core blocks 410A, 400A, 400B, 410B, and nuts 431 are threadedly engaged with the bolts 430, thereby fixing the stator 2 to the stator fixing portion 412 of the housing 4.

[0093] Fig.30 It is a front view of a stacked body of core blocks 400A and 400B. Fig.31 It is a front view of the core block 400A. Fig.32It is a front view of the core block 400B. Fig.33 410A is a front view of the core block. Fig.31 As shown, the core block 400A is provided with Fig.18 The core block 400E has the same refrigerant flow passages 203, 204, 205, and 206. In the core block 400A, three fastening parts 209 protruding radially outward are provided at intervals of 120 degrees. A through hole 408 is provided in each fastening part 409. A through hole 207 for supplying refrigerant is provided in one fastening part 409, and the refrigerant introduction path 206 is connected to the through hole 207.

[0094] like Fig.32 As shown, the core block 400B is provided with Fig.19 The core block 200F has the same refrigerant flow passages 203, 204, 205. Fig.30 As shown, the core block 400B is stacked by rotating a predetermined angle 3θ with respect to the core block 400A around the axis CL1. In the state where the core blocks 400A and 400B are stacked, the circumferential end of the refrigerant flow channel 205 of the core block 400A overlaps with the circumferential end of the refrigerant flow channel 205 of the core block 400B. As a result, the refrigerant flow channel 205 of the core block 400A is connected to the refrigerant flow channel 205 of the core block 400B, and a generally annular flow channel is formed in the core blocks 400A and 400B.

[0095] In addition, the refrigerant flow channel 205 of the core block 400A is opposed to the radial outer peripheral end of the refrigerant flow channel 203 of the core block 400B, and the radial inner end of the refrigerant flow channel 203 of the core block 400B is opposed to the refrigerant flow channel 204 of the core block 400A. The refrigerant flow channel 205 of the core block 400B is opposed to the radial outer end of the refrigerant flow channel 203 of the core block 400A, and the radial inner end of the refrigerant flow channel 203 of the core block 400A is opposed to the refrigerant flow channel 204 of the core block 400B.

[0096] like Fig.33 As shown, the core block 410A is provided with Figure 6 The core block 410B has the same refrigerant flow path 204 as the core block 210. Through holes 408 are provided in each fastening portion 409, and a through hole 207 for supplying refrigerant is provided in one fastening portion 409. Although not shown in the figure, the core block 410B is not provided with a through hole 207, and other than that, the core block 410B is configured in the same manner as the core block 410A.

[0097] Fig.34 is along Fig.30 A cross-sectional view of the stator core 20 cut along the D4-D4 line. Fig.34 In addition to the core blocks 400A and 400B, the core blocks 410A and 410B and the stator coil 21 are also shown. Fig.34 As shown, in the stator fixing portion 412 of the housing 4, a refrigerant introduction hole 412a for introducing a refrigerant from the outside is provided at a position opposing the through hole 207 of the core block 410A.

[0098] like Fig.34 As shown by the middle arrow, the refrigerant supplied from the outside through the refrigerant introduction hole 412a flows from the through hole 207 of the core block 410A into the through hole 207 of the core block 400A. The refrigerant flowing into the through hole 207 of the core block 400A flows into the refrigerant flow path 205 through the refrigerant introduction path 206. The refrigerant in the refrigerant flow path 205 flows into the refrigerant flow path 203 of the core block 400B.

[0099] The radial inner end of the refrigerant flow channel 203 of the core block 400B is opposed to the refrigerant flow channel 204 of the core block 400A and the refrigerant flow channel 204 of the core block 410B adjacent to the core block 400B. Therefore, the refrigerant in the refrigerant flow channel 203 of the core block 400B flows in the axial direction along the refrigerant flow channel 204 of the core block 410B, flows out from the end surface of the core block 410B, and flows to the coil end. The refrigerant that flows from the refrigerant flow channel 203 of the core block 400B into the refrigerant flow channel 204 of the core block 400A flows in the axial direction along the refrigerant flow channels 204 of the core blocks 400A and 410A, flows out from the end surface of the core block 410A, and flows to the coil end.

[0100] In this way, the fastening portion 409 protruding from the outer circumferential surface of the core blocks 410A, 400A, 400B, and 410B can be fixed to the stator fixing portion 412 to form the stator core 20. In this case, as in the second embodiment, by alternating the refrigerant flow channels extending in the circumferential direction and the refrigerant flow channels extending in the radial direction and arranging them at a predetermined angle 3θ in the circumferential direction, it is possible to improve the cooling performance and suppress the reduction in torque caused by the provision of the refrigerant flow channels.

[0101] In addition, Fig.29 In the structure of the present invention, the refrigerant can be introduced into the stator core 20 using the refrigerant introduction hole 412a of the stator fixing portion 412. In this case, by arranging the through hole 207 for supplying the refrigerant near the through hole 408, the sealing performance when the stator core 20 is fastened to the housing 4 by bolts can be improved. It is also possible to well suppress the reduction in torque caused by the provision of the through hole 207.

[0102] The effects of the above-described embodiment and modified examples are summarized as follows.

[0103] (1) The rotary electric machine 1 includes a rotor 3 and a stator 2 having a plurality of slots 201 arranged in the circumferential direction. Figure 1The stator 2 has a stator core 20 and a coil 21. The stator core 20 has core blocks 200A, 200B or core blocks 200E, 200F arranged adjacent to each other in the axial direction. The coil 21 is arranged in a plurality of slots 201 ( Figure 7 , 20 ). Multiple refrigerant flow channels 202 and multiple refrigerant flow channels 203 or multiple refrigerant flow channels 203 and multiple refrigerant flow channels 205 are alternately arranged in the core blocks 200A, 200B or the core blocks 200E, 200F at intervals of a predetermined angle θ or a predetermined angle 3θ in the circumferential direction, respectively, and penetrate the core blocks 200A, 200B or the core blocks 200E, 200F in the axial direction. ( Figure 3 , 17 The core blocks 200A and 200B are configured such that the multiple refrigerant flow channels 202 of the core block 200A are connected to the multiple refrigerant flow channels 203 of the core block 200B, and the multiple refrigerant flow channels 203 of the core block 200A are connected to the multiple refrigerant flow channels 202 of the core block 200B ( Figure 3 The core blocks 200E and 200F are configured such that the multiple refrigerant channels 203 of the core block 200E are connected to the multiple refrigerant channels 205 of the core block 200F, and the multiple refrigerant channels 205 of the core block 200E are connected to the multiple refrigerant channels 203 of the core block 200F ( Fig.17 ).

[0104] Thus, by providing the refrigerant flow passages 202, 203 or the refrigerant flow passages 203, 205 inside the core blocks 200A, 200B or the core blocks 200E, 200F, the refrigerant can flow into the core blocks, thereby efficiently cooling the core blocks. Thus, the stator coils 21 arranged in the slots 201 of the stator core 20 can be well cooled.

[0105] (2) The refrigerant flow path 202 (first flow path) extends radially from the outer peripheral surface 211 of each of the core block 200A (first core block) and the core block 200B (second core block) to an annular region E1 (predetermined annular region) extending in the circumferential direction radially inside the outer peripheral surface 211 and radially outside the groove 201 ( Figure 4 The refrigerant flow path 203 (second flow path) is radially extended from the annular region E1 to the region near the groove 201 ( Figure 4). In this way, multiple refrigerant flow channels 202 and multiple refrigerant flow channels 203 extending in the radial direction are alternately arranged in the circumferential direction at predetermined angles θ in the core blocks 200A and 200B, respectively. Multiple refrigerant flow channels 202 are extended from the outer peripheral surface of the back yoke to the region E1, and multiple refrigerant flow channels 203 are extended from the region E1 to the vicinity of the groove 201, that is, the region E2. Thus, the torque reduction caused by the provision of the refrigerant flow channels can be suppressed, and the cooling efficiency can be improved.

[0106] (3) The annular region E1 is located approximately in the radial direction between the outer peripheral surface 211 of each of the core blocks 200A and 200B and the radially outer end of the slot 201 ( Figure 4 ). Therefore, if Fig.16 As shown, the torque improvement rate is the largest, and the degree of torque reduction caused by the provision of the refrigerant flow path can be reduced.

[0107] (4) The refrigerant flow path 205 (first flow path) is provided to extend in the circumferential direction in an annular region E1 (predetermined annular region) which is radially inward of the outer peripheral surface 211 of each of the core block 200E (first core block) and the core block 200F (second core block) and extends in the circumferential direction in the radial direction outside the groove 201 ( Fig.18 The refrigerant flow path 203 (second flow path) is radially extended from the annular region E1 to the region near the groove 201 ( Fig.18 The core block 200E is provided with a refrigerant inlet passage 206 (refrigerant supply portion), which extends radially from the outer peripheral surface 211 of the core block 200E to the refrigerant flow channel 205 ( Fig.18 Thus, by alternately arranging the refrigerant flow passage 205 extending in the circumferential direction and the refrigerant flow passage 203 arranged radially inward of the refrigerant flow passage 205 and extending in the radial direction at predetermined angles 3θ in the circumferential direction, it is possible to suppress the reduction in torque and improve the cooling efficiency.

[0108] (5) The annular region E1 is located radially inward of the radially approximately middle between the outer peripheral surface 211 of each of the core blocks 200E and 200F and the radially outer end of the slot 201 ( Fig.18 ). Therefore, if Fig.25 As shown, the torque improvement rate can be increased and the degree of torque reduction caused by providing the refrigerant flow path can be reduced.

[0109] (6) In the core blocks 200A, 200B or the core blocks 200E, 200F, a plurality of refrigerant flow paths 204 (third flow paths) are provided in the annular region E2 near the groove 201 and in the circumferential direction, penetrating the core blocks in the axial direction. Figure 3 , 17The refrigerant flow passages 204 of the core blocks 200A and 200E are connected to the radially inner ends of the refrigerant flow passages 203 of the core blocks 200B and 200F ( Figure 3 , 17 The refrigerant flow passages 204 of the core blocks 200B and 200F are connected to the radially inner ends of the refrigerant flow passages 203 of the core blocks 200A and 200E ( Figure 3 , 17 By providing the refrigerant flow path 204 near the slot 201 in this way, the cooling efficiency of the stator coil 21 in the slot 201 can be improved by using the refrigerant flowing in the refrigerant flow path 204 .

[0110] (7) The stator core 20 further includes a pair of core blocks 210, 210 (third core blocks) in the core blocks 200A, 200B or the core blocks 200E, 200F, respectively. The pair of core blocks 210, 210 (third core blocks) are arranged adjacent to each other in the axial direction ( Figure 7 , 20 A plurality of refrigerant flow channels 204 (fourth flow channels) are provided in a pair of core blocks 210, 210, and the plurality of refrigerant flow channels 204 (fourth flow channels) penetrate the pair of core blocks 210, 210 in the axial direction, and are connected to the radial inner end of the refrigerant flow channel 203 of the core block 200A or 200F and the refrigerant flow channel 204 of the core block 200B or 200E ( Figure 7 , 20 ) By providing the refrigerant flow path 204 in the pair of core blocks 210 in this way, it is possible to further suppress the reduction in torque.

[0111] (8) The refrigerant flow path 203 is further extended from the area E2 near the groove to the groove 201 ( Figure 8 , 21 ). Thus, the refrigerant flows from the refrigerant flow path 203 into the groove 201 , so that the stator coil 21 can be directly cooled by the refrigerant, thereby improving the cooling efficiency of the stator coil 21 .

[0112] (9) The plurality of grooves 201 are arranged at predetermined angles θ in the circumferential direction. Fig.18 ). If an integer N is used that is greater than or equal to 2, the predetermined angle when a plurality of refrigerant flow channels 203 and a plurality of refrigerant flow channels 205 are provided at predetermined angles is N times θ (3θ), and N (3) refrigerant flow channels 203 are arranged at predetermined angles θ between a pair of refrigerant flow channels 205, 205 adjacent in the circumferential direction ( Fig.18 ). Thus, all the refrigerant flow paths 203 and the refrigerant flow paths 205 can be communicated with each other through one rotation and lamination.

[0113] (10) The stator core 20 has a plurality of circumferentially extending fastening portions 409 (bolt insertion holes) protruding radially outward from the outer circumferential surface 211 of the stator core 20 and having through holes 408 (bolt insertion holes). Fig.30 At least one of the plurality of fastening portions 409 in the circumferential direction has a through hole 207 (refrigerant introduction hole) for supplying refrigerant, which is connected to the refrigerant flow path 205 and is introduced from the outside, formed near the through hole 408 ( Fig.30 By arranging the through hole 207 for supplying the refrigerant near the through hole 408, the torque reduction caused by the provision of the through hole 207 can be suppressed, and the tightening force of the bolt acts on the tightening portion 409 in the axial direction via the through hole 408, thereby improving the sealing performance.

[0114] The above-described embodiment and the modified examples may be arbitrarily combined with one or more of them, and the modified examples may be combined with each other.

[0115] By adopting the present invention, the cooling performance of the coil can be improved.

[0116] The present invention has been described above in conjunction with the preferred embodiments, but it should be understood by those skilled in the art that various modifications and changes can be made without departing from the scope of the disclosure of the claims set forth below.

Claims

1. A rotating electrical machine, comprising a rotor (3) and a stator (2) having a plurality of slots (201) arranged in a circumferential direction, characterized in that: The stator (2) has a stator core (20) and a coil (21), wherein the stator core (20) has a first core block (200A, 200E) and a second core block (200B, 200F) arranged adjacent to each other in the axial direction, and the coil (21) is arranged in the plurality of slots (201). A plurality of first flow passages (202, 205) and a plurality of second flow passages (203) are alternately provided at predetermined angles in the circumferential direction on the first core block (200A, 200E) and the second core block (200B, 200F) and penetrate the first core block (200A, 200E) and the second core block (200B, 200F) in the axial direction, respectively. The first core block (200A, 200E) and the second core block (200B, 200F) are configured such that the multiple first flow channels (202, 205) of the first core block (200A, 200E) are connected to the multiple second flow channels (203) of the second core block (200B, 200F), and the multiple second flow channels (203) of the first core block (200A, 200E) are connected to the multiple first flow channels (205) of the second core block (200B, 200F).

2. The rotating electrical machine according to claim 1, characterized in that: The first flow channel (202) is radially extended from the outer peripheral surface (211) of each of the first core block (200A) and the second core block (200B) to a predetermined annular region (E1) radially extending inwardly of the outer peripheral surface (211) and in the circumferential direction radially outwardly of the groove (201). The second flow channel (203) is extended in the radial direction from the predetermined annular region (E1) to a region near the groove (201).

3. The rotating electrical machine according to claim 2, characterized in that: The predetermined annular region (E1) is located approximately in the radial direction between the outer peripheral surface (211) of each of the first core block (200A) and the second core block (200B) and the radially outer end of the slot (201).

4. The rotating electrical machine according to claim 1, characterized in that: The first flow channel (205) is circumferentially extending in a predetermined annular region (E1) that is radially inward of the outer peripheral surface (211) of each of the first core block (200E) and the second core block (200F) and that extends circumferentially on the radially outer side of the groove (201). The second flow channel (203) is radially extended from the predetermined annular region (E1) to a region near the groove (201). The first core block (200E) is provided with a refrigerant supply portion (206), and the refrigerant supply portion (206) extends from the outer peripheral surface (211) of the first core block (200E) to the first flow channel (205) in the radial direction.

5. The rotating electrical machine according to claim 4, characterized in that: The predetermined annular region (E1) is located radially inward of a substantially radial middle between the outer peripheral surface (211) of each of the first core block (200E) and the second core block (200F) and the radial outer end of the slot (201).

6. The rotating electrical machine according to claim 2 or 4, characterized in that: The first core block (200A, 200E) and the second core block (200B, 200F) are provided with a plurality of third flow channels (204) respectively penetrating the first core block (200A, 200E) and the second core block (200B, 200F) in the axial direction in the vicinity of the slot (201). The first core block (200A, 200E) and the second core block (200B, 200F) are constructed such that the third flow channel (204) of the first core block (200A, 200E) is connected to the radial inner end of the second flow channel (203) of the second core block (200B, 200F), and the third flow channel (204) of the second core block (200B, 200F) is connected to the radial inner end of the second flow channel (203) of the first core block (200A, 200E).

7. The rotating electrical machine according to claim 6, characterized in that The stator core (20) further comprises a pair of third core blocks (210, 210) disposed adjacent to each other in the axial direction on the first core block (200A) and the second core block (200B). A plurality of fourth flow channels are provided in the pair of third core blocks (210, 210), and the plurality of fourth flow channels axially penetrate the pair of third core blocks (210, 210), and are connected with the radial inner ends of the plurality of second flow channels (203) of the first core block (200A) and the plurality of third flow channels (204) of the second core block (200B).

8. The rotating electrical machine according to claim 2 or 4, characterized in that: The second flow channel (203) is further extended from the vicinity of the groove (201) to the groove (201).

9. The rotating electrical machine according to claim 4, characterized in that: The specified angle is a first angle (3θ), The plurality of grooves (201) are arranged at intervals of a second angle (θ) in the circumferential direction, When an integer N of 2 or more is used, the first angle (3θ) is N times the second angle (θ), Between a pair of the first flow channels (205, 205) adjacent to each other in the circumferential direction, N second flow channels (203) are arranged at every second angle (θ).

10. The rotating electrical machine according to claim 4, characterized in that The stator core (20) has a plurality of fastening parts (409) in the circumferential direction, wherein the plurality of fastening parts (409) in the circumferential direction are protruded radially outward from the outer circumferential surface of the stator core (20) and are formed with bolt insertion holes (408). At least one of the plurality of fastening portions (409) in the circumferential direction is formed with a refrigerant introduction hole (207) near the bolt insertion hole (408) for introducing refrigerant from the outside and communicating with the first flow channel (205).

11. The rotating electrical machine according to claim 1, characterized in that The first core blocks (200A, 200E) and the second core blocks (200B, 200F) are each formed by laminating a plurality of electromagnetic steel plates.

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