stator core

Abstract

Provided is a technique in which a stator core is not disconnected by a refrigerant passage. A stator core is configured as a ring-shaped stator core having a plurality of teeth arranged in a circumferential direction and not connected at an inner side in a radial direction, and a plurality of slots formed in the circumferential direction between the teeth, a flow path of a refrigerant extending at least in the circumferential direction, that is, a first refrigerant passage, is formed at a position separated in the circumferential direction at an outer side in the radial direction than the slots and at an inner side in the radial direction than a face of the stator core at an outer side in the radial direction, and a flow path of a refrigerant extending at least in the radial direction and opening in the slots and the first refrigerant passage, that is, a second refrigerant passage, is formed at a position separated in the circumferential direction at a position different in the axial direction from the first refrigerant passage.

Description

Technical Field

[0001] This invention relates to a stator core. Background Technology

[0002] Conventionally, it is known to form a refrigerant flow path, or refrigerant passage, within the stator core, and to connect this refrigerant passage to slots to allow the refrigerant to flow into the slots. For example, Patent Document 1 discloses a technique that uses an annular space sandwiched between the outer circumferential surface of the stator core and the inner circumferential surface of the housing as a flow path for the cooling medium, and forms a flow path extending from this annular flow path to each slot, allowing the cooling medium to flow into the slots.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2024-125483

[0004] In the aforementioned prior art, a flow path is provided around the radially outer side of the slots, extending from this flow path to each slot. Therefore, when this structure is applied to a stator core with multiple stacked electromagnetic steel plates, the electromagnetic steel plates are broken in both the circumferential and radial directions. In this case, a structure requiring the bonding of the broken components is necessary. Summary of the Invention

[0005] The present invention was made in view of the above-mentioned problems, and its purpose is to provide a technology that prevents the stator core from breaking due to the refrigerant passage.

[0006] One embodiment of the stator core is an annular stator core having a plurality of teeth arranged circumferentially and not connected radially inward, and a plurality of slots formed circumferentially between the teeth. A first refrigerant passage, which extends at least circumferentially, is formed at a plurality of locations radially outward and radially inward of the surface of the stator core that is radially outward. A second refrigerant passage, which extends at least radially and opens in the slots and the first refrigerant passage, is formed at a plurality of locations circumferentially separated in the axial direction at a different location from the first refrigerant passage.

[0007] In one embodiment, the stator core has a first refrigerant passage extending circumferentially and a second refrigerant passage extending radially formed at different axial positions. According to this structure, the stator core is not disconnected by the first and second refrigerant passages at the same axial position. Therefore, the stator core is not disconnected by the refrigerant passages. Attached Figure Description

[0008] Figure 1 This is a 3D diagram of the stator core.

[0009] Figure 2 This is an exploded 3D view of the stator core.

[0010] Figure 3 This is a diagram showing the state of the first iron core as viewed along the axial direction.

[0011] Figure 4 This is a diagram showing the state of the first iron core as viewed along the axial direction.

[0012] Figure 5 This is a diagram showing the state of the second core as viewed along the axial direction.

[0013] Figure 6 This is a magnified diagram showing a portion of the second refrigerant passage.

[0014] Figure 7 This is a diagram showing the state of the second iron core viewed along the axial direction, overlaid with the state of the first refrigerant passage.

[0015] Figure 8 This is a diagram showing the state of the second core as viewed along the axial direction.

[0016] Figure 9 This is a diagram showing the state of the third core as viewed along the axial direction.

[0017] Figure 10 This is a magnified diagram showing a portion of the second refrigerant passage.

[0018] Figure 11 This is a magnified diagram showing a portion of the second refrigerant passage.

[0019] Figure 12A This is a modified example representing the first refrigerant passage. Figure 12B This is a variation representing the second refrigerant passage. Figure 12C This is a diagram showing a modified example of tooth 40.

[0020] Explanation of reference numerals in the attached figures

[0021] 10...First iron core, 10a...First iron core, 10b...First iron core, 11...First refrigerant passage, 20...Second iron core, 20a...Second iron core, 20b...Second iron core, 21...Second refrigerant passage, 21a...End, 21b...End, 21c...First part, 21d...Second part, 21e...Opening, 30...Third iron core, 31...Cover component, 40...Tooth, 40a...Protrusion, 41...Insertion Slot, 41a...wall, 42...coil, 42a...coil, 42b...insulating component, 100...stator core, 100a...protrusion, 110...first refrigerant passage, 110a...part, 210...second refrigerant passage, 210e...opening, 220...second refrigerant passage, 220e...opening, 230...second refrigerant passage, 240...second refrigerant passage, 240a...part, 240b...part. Detailed Implementation

[0022] Here, embodiments of the present invention will be described in the following order.

[0023] (1) Structure of stator core:

[0024] (1-1) Structure of the first iron core:

[0025] (1-2) Structure of the second iron core:

[0026] (1-3) Structure of the third iron core:

[0027] (2) Refrigerant flow path:

[0028] (3) Other implementation methods, etc.:

[0029] (1) Structure of stator core:

[0030] Figure 1 This is a perspective view of the stator core 100 of this embodiment. Figure 2 This is an exploded perspective view of the stator core 100. The stator core 100 is a ring-shaped component. Figure 1 as well as Figure 2 In the diagram, the central axis Ax of the ring formed by the stator core 100 is shown by a single-dot dashed line. Figure 2 The stator core 100 is shown in a disassembled state along the central axis Ax.

[0031] A rotor (not shown) is disposed inside the ring formed by the stator core 100. The rotor is a component that rotates about the central axis Ax of the ring formed by the stator core 100. In this specification, the direction parallel to the central axis Ax is called the axial direction, the direction perpendicular to the central axis Ax is called the radial direction, and the direction of rotation about the central axis Ax is called the circumferential direction. In addition, in the radial direction, the direction away from the central axis Ax is called the radial outer direction, and the direction closer to the central axis Ax is called the radial inner direction.

[0032] The stator core 100 has a plurality of teeth 40 arranged circumferentially and a plurality of slots 41 formed between the teeth 40 in the circumferential direction. In this embodiment, the teeth 40 are portions that protrude radially inward from the radially inner side of the stator core 100. The teeth 40 are formed at constant intervals in the circumferential direction along the entire circumference of the inner circumference of the stator core 100. The number of teeth 40 can be various. In this embodiment, the cross-sectional shape of the teeth 40 in the direction perpendicular to the axial direction is the same at any position in the axial direction. Therefore, the teeth 40 are portions that protrude radially from the radially outer side towards the inner side and extend axially in a state with the same cross-sectional shape in the direction perpendicular to the axial direction. The spaces formed between the teeth 40 in the circumferential direction are slots 41. Figure 1 The image shows a configuration where the coil 42 is arranged in slot 41. In this embodiment, the teeth 40 are not connected radially inward. That is, as shown... Figure 1 , Figure 2 As shown, the slot 41 has a radially inner opening, and the portion of the opening is not connected at any position in the axial direction.

[0033] In this embodiment, the stator core 100 is composed of a first core 10, a second core 20, and a third core 30. The first core 10 and the second core 20 are located in the central portion along the axial direction. In this embodiment, they are stacked sequentially from one side of the axial direction in the order of second core 20, first core 10, first core 10, and second core 20. That is, the two first cores 10 are connected at the center, and the second core 20 holds the two axial ends of the two first cores 10. The axial ends of the second core 20 are held by the third core 30.

[0034] In this embodiment, the stator core 100 has a protrusion 100a that protrudes radially outward from the radially outer side of the annular portion. In this embodiment, the protrusions 100a are formed in three locations on the stator core 100, with equal circumferential distances between them. That is, each protrusion 100a is positioned at a rotation angle of 120° away from the central axis Ax. A bolt hole extending axially is formed in each protrusion 100a, and the stator core 100 is fixed to a fixing portion (not shown) by a bolt inserted into this bolt hole.

[0035] (1-1) Structure of the first iron core:

[0036] Next, the structure of the first iron core 10 will be described. In this embodiment, the first iron core 10 is constructed by stacking electromagnetic steel plates of the same shape and constant thickness. In this embodiment, the first iron core 10 is the portion where the first refrigerant passage is formed. This embodiment has multiple first iron cores 10 with different shapes and positions of the first refrigerant passage. When it is necessary to distinguish between the two, each of the first iron cores 10 will be referred to as first iron core 10a, first iron core 10b, etc.

[0037] Figure 3 This diagram shows the state of the electromagnetic steel plate constituting the first core 10a as viewed along a direction parallel to the central axis Ax. The first core 10a has refrigerant flow paths, namely first refrigerant passages 11, formed at multiple circumferentially separated locations and extending at least circumferentially. In this embodiment, the first refrigerant passage 11 is formed radially outward from the slot 41 and radially inward from the surface So of the stator core 100.

[0038] Specifically, the first refrigerant passage 11 is divided equally in the circumferential direction within a range Z1 from the outermost radial surface of the slot 41 to the outermost radial surface So of the stator core 100, forming holes extending in the circumferential direction at constant lengths from each position obtained by the equal division, thus constituting the first refrigerant passage 11. Furthermore, in this embodiment, the distance L1 between adjacent first refrigerant passages 11 is constant. Figure 3 The first refrigerant passage 11 shown is formed at six locations on the first iron core 10a. That is, in this example, the area Z1 of the first iron core 10a is divided into six parts in the circumferential direction, forming holes extending circumferentially at a constant length from the positions obtained by the division, becoming... Figure 3 The first refrigerant passage 11 is shown.

[0039] Furthermore, in this embodiment, the sum of the circumferential lengths of the plurality of first refrigerant passages 11 is longer than half of the full circumferential length. Additionally, in this embodiment, the radial length of the first refrigerant passages 11 is approximately constant. Moreover, the first refrigerant passages 11 axially penetrate the first iron core 10a.

[0040] Furthermore, a refrigerant supply port Hr is formed in the first iron core 10a (see reference). Figure 1 , Figure 2 , Figure 3In this embodiment, the supply port Hr is an axially penetrating hole formed radially outward from the slot 41, having two radially parallel sides and one circumferentially parallel side when viewed axially from the first core 10a. In this embodiment, the supply port Hr is formed at the center of the first refrigerant passage 11 adjacent to it in the circumferential direction. The first refrigerant passage 11 of the first core 10b is located axially adjacent to the supply port Hr (see reference). Figure 2 Therefore, the supply port Hr is connected to the first refrigerant passage 11 of the first iron core 10b.

[0041] The circumferential width of the supply port Hr is constant, and when viewed from the radial outside, the opening through the supply port Hr on the outer surface of the stator core 100 is rectangular. Furthermore, the shape of the supply port Hr is the same in the radial direction. That is, the supply port Hr is constructed by forming rectangular holes of the same shape to a constant depth in the radial direction. The supply port Hr is the inlet for supplying refrigerant. Alternatively, the supply port Hr may also be formed in the first core 10b.

[0042] Figure 4 This diagram shows the state of the electromagnet plate constituting the first iron core 10b as viewed along a direction parallel to the central axis Ax. The first iron core 10b has a shape approximately the same as the first iron core 10a. However, the position where the first refrigerant passage 11 is formed differs from that of the first iron core 10a. That is, when viewed axially, the first refrigerant passage 11 formed in the first iron core 10b and the first refrigerant passage 11 formed in the first iron core 10a overlap each other at their circumferential ends. Therefore, if the first iron core 10a and the first iron core 10b are connected, the first refrigerant passage 11 formed in the first iron core 10a and the first refrigerant passage 11 formed in the first iron core 10b are connected. According to the above structure, the first refrigerant passage 11 of the first iron core 10a and the first refrigerant passage 11 of the first iron core 10b form a series of refrigerant passages that are alternately continuous in the circumferential direction and connected throughout the entire circumference. Furthermore, in this embodiment, although the supply port Hr is not formed in the first iron core 10b, it is also possible to form the supply port Hr in the first iron core 10b instead of the first iron core 10a.

[0043] (1-2) Structure of the second iron core:

[0044] Next, the structure of the second iron core 20 will be described. In this embodiment, the second iron core 20 is constructed by stacking electromagnetic steel plates of the same shape and constant thickness. In this embodiment, the second iron core 20 is the portion where the second refrigerant passage is formed. This embodiment has multiple second iron cores 20 with different shapes and positions of the second refrigerant passage. When it is necessary to distinguish between the two, each of the second iron cores 20 will be referred to as second iron core 20a, second iron core 20b, etc.

[0045] Figure 5 This diagram shows the state of the electromagnet plate constituting the second core 20a as viewed along a direction parallel to the central axis Ax. The second core 20a has refrigerant flow paths, namely second refrigerant passages 21, formed at multiple circumferentially separated locations and extending radially. In this embodiment, the second core 20a is positioned adjacent to the first core 10a in the axial direction, so their axial positions are different. Therefore, when viewed as a whole of the stator core 100, the second refrigerant passages 21 are formed at positions different in the axial direction from the first refrigerant passages 11.

[0046] The second refrigerant passage 21 is a refrigerant flow path that extends at least radially and opens into the slot 41 and the first refrigerant passage 11. Figure 6 It is an enlarged representation Figure 5 A diagram showing a portion of the second refrigerant passage 21. Figure 6 In the example shown, four coils 42 are arranged within the slot 41. Additionally, when viewed axially, an insulating member 42b is mounted to surround the outer periphery of the four coils 42. The insulating member 42b is made of a non-conductive material and is sandwiched between the inner wall of the slot 41 and the coils 42.

[0047] like Figure 6 As shown, the second refrigerant passage 21 in this embodiment is a generally straight hole with a substantially constant circumferential width and extending radially. The second refrigerant passage 21 penetrates the second iron core 20a axially. The radially outer end 21a of the second refrigerant passage 21 overlaps with the first refrigerant passage 11 radially. That is, when viewed axially, the end 21a of the second refrigerant passage 21 overlaps with the first refrigerant passage 11, and the second refrigerant passage 21 opens into the first refrigerant passage 11.

[0048] The circumferential position of the second refrigerant passage 21 is located approximately at the same position as the inner wall of one circumferential side of the slot 41. Furthermore, in this embodiment, a portion of the second refrigerant passage 21 is formed on the tooth 40, and the radially inner end 21b of the second refrigerant passage 21 reaches a position near the radially inner side of the slot 41. Specifically, the radially inner end 21b of the second refrigerant passage 21 is located radially inner than the innermost coil 42a among the plurality of coils 42 disposed in the slot 41.

[0049] The second refrigerant passage 21 is formed along one circumferential side of the slot 41 and connects to the slot 41 radially inward from the radially outer side of the slot 41. Therefore, the second refrigerant passage 21 opens toward the slot 41 radially inward from the radially outer side of the slot 41. That is, the second refrigerant passage 21 of this embodiment includes: a first portion 21c extending radially outward from the radially outer side of the slot 41; and a second portion 21d connected to the first portion 21c and extending radially inward, having a radially extending opening 21e on the wall surface of one circumferential side of the slot 41.

[0050] In this embodiment, the second refrigerant passage 21 opens circumferentially on one side of the wall of the slot 41 that holds the tooth 40. Furthermore, the circumferential distance L2 between the unopened wall surface 41a of the second refrigerant passage 21 and the second refrigerant passage 21 is greater than or equal to the circumferential width W of the innermost tooth 40 in the radial direction. Here, the circumferential distance and width are linear distance and width along a straight line, respectively. Additionally, the circumferential distance L2 between the wall surface 41a and the second refrigerant passage 21 is the shortest distance between the wall surface 41a and the second refrigerant passage 21.

[0051] When the distance L2 ≥ width W, when viewed from the axial direction, if the straight line La extending in the same direction as the wall surface 41a extends from the intersection point Pi of the innermost radial surface of the tooth 40 and the wall surface where the second refrigerant passage 21 opens, the second refrigerant passage 21 overlaps with the straight line La, or exists on the opposite side of the wall surface 41a while sandwiching the straight line La. That is, when viewed from any position, the distance between the second refrigerant passage 21 and the wall surface 41a is always greater than or equal to the width W.

[0052] In this embodiment, a rotor is arranged radially inside the stator core 100. Most of the magnetic flux generated by this rotor bypasses the air and passes through the interior of the teeth 40. The amount of magnetic flux passing through the interior of the teeth 40 depends on the width W of the innermost radial tooth 40. However, even if a certain amount of magnetic flux enters the teeth 40, if there is a portion narrower than the width W at any radial position of the teeth 40, the magnetic flux will leak out of that portion. If the magnetic flux leaks out of the teeth 40, the torque generated in the rotating motor will decrease.

[0053] Therefore, in this embodiment, the distance L2 is configured to be greater than or equal to the width W. With this structure, the magnetic flux entering the tooth 40 cannot leak out of the tooth 40. As a result, torque is not reduced in the rotary motor.

[0054] The second refrigerant passage 21, as described above, is formed at multiple circumferential locations within the second iron core 20a. In this embodiment, as... Figure 5 As shown, each of the five slots 41 arranged continuously in the circumferential direction has an opening for a second refrigerant passage 21, while the next three slots 41 arranged continuously in the circumferential direction do not have corresponding second refrigerant passages 21. In the second iron core 20a, this pattern of eight slots 41 is repeated six times in the circumferential direction.

[0055] Furthermore, five second refrigerant passages 21 arranged circumferentially are formed at the openings of the first refrigerant passage 11 to the first iron core 10a. Figure 7 This indicates that the first refrigerant passage 11 is connected to... Figure 5 The diagram shows the overlapping of the second iron core 20a. (See diagram below.) Figure 7 As shown, the five circumferentially arranged second refrigerant passages 21 overlap with the circumferential range of one first refrigerant passage 11. Therefore, the five circumferentially arranged second refrigerant passages 21 open into one first refrigerant passage 11. The five circumferentially arranged second refrigerant passages 21 are formed in a total of six locations, each corresponding to a first refrigerant passage 11, so each second refrigerant passage 21 formed in the second iron core 20a opens into the first refrigerant passage 11 formed in the first iron core 10a.

[0056] Figure 8 This diagram shows the state of the electromagnet plate constituting the second core 20b as viewed along a direction parallel to the central axis Ax. The second core 20b has a shape approximately the same as the second core 20a. However, the positions where the second refrigerant passages 21 are formed differ from those in the second core 20a. Specifically, in the second core 20b, each of the five slots 41 arranged continuously in the circumferential direction forms an open second refrigerant passage 21, while the next three slots 41 arranged continuously in the circumferential direction do not form corresponding second refrigerant passages 21. In the second core 20b, this pattern of eight slots 41 is repeated six times circumferentially.

[0057] The positions of the five circumferentially continuous second refrigerant passages 21 formed in the second iron core 20b and the second iron core 20a are different. Specifically, the second refrigerant passages 21 in the second iron core 20b are located at positions obtained by rotating the second refrigerant passages 21 in the second iron core 20a 30° circumferentially. As a result, the five circumferentially arranged second refrigerant passages 21 in the second iron core 20b are formed at positions where they open into the first refrigerant passage 11 of the first iron core 10b.

[0058] Therefore, the five second refrigerant passages 21 arranged circumferentially in the second core 20b open into one first refrigerant passage 11 formed in the first core 10b. The five second refrigerant passages 21 arranged circumferentially in the second core 20b are formed in a total of six locations, each corresponding to a first refrigerant passage 11 formed in the first core 10b. Therefore, each second refrigerant passage 21 formed in the second core 20b opens into a first refrigerant passage 11 formed in the first core 10b. Furthermore, in this embodiment, the total number of second refrigerant passages 21 formed in the second cores 20a and 20b is 60 (5×6×2), but only at least one second refrigerant passage 21 needs to open relative to a slot 41. Therefore, the number of second refrigerant passages 21 could also be 48.

[0059] (1-3) Structure of the third iron core:

[0060] Next, the structure of the third iron core 30 will be described. In this embodiment, the third iron core 30 is constructed by stacking electromagnetic steel plates of constant thickness. Figure 9 This diagram shows the state of the electromagnetic steel plate constituting the third iron core 30 as viewed along a direction parallel to the central axis Ax. Similar to the first iron core 10 and the second iron core 20, the third iron core 30 has multiple teeth 40 and slots 41.

[0061] In this embodiment, no refrigerant flow path is formed on the radially outer side of the slot 41 of the third core 30. Instead, the interior of the slot 41 serves as the refrigerant flow path. Specifically, in this embodiment, a cylindrical cover member 31 is installed in contact with the inner circumferential surface of the stator core 100. The cover member 31 is a cylindrical component of constant thickness, and the diameter of its outer radially outer circumferential surface is slightly smaller than the diameter of the inner radially inner circumferential surface of the stator core 100. The axial length of the cover member 31 is approximately the same as the axial length of the stator core 100.

[0062] In the coil 42 disposed inside the slot 41, the innermost coil 42 is located in the radial direction ( Figure 6The coil 42a) shown has an axially extending space formed on its radially inner side, which serves as a refrigerant flow path. That is, refrigerant is supplied to this space from the second refrigerant passage 21, and the refrigerant flows through this space axially.

[0063] (2) Refrigerant flow path:

[0064] The above structure forms a refrigerant passage from the supply port Hr to the axial end of the slot 41. Specifically, the first iron core 10, the second iron core 20, and the third iron core 30 are connected to form a refrigerant passage. Figure 1 In the state shown, refrigerant is supplied from the supply port Hr toward the interior of the stator core 100. When refrigerant is supplied from the supply port Hr, it is supplied to the first refrigerant passage 11 of the open first core 10b. The first refrigerant passages 11 of the first core 10a and the first refrigerant passages 11 of the first core 10b form a series of refrigerant passages that are alternately continuous in the circumferential direction and connected throughout the entire circumference. Therefore, when refrigerant is supplied to the first refrigerant passage 11 of the first core 10b that is open at the supply port Hr, the refrigerant is supplied throughout the entire circumference via multiple first refrigerant passages 11.

[0065] Furthermore, each of the five second refrigerant passages 21 opens into each of the first refrigerant passages 11, so that refrigerant present in each of the first refrigerant passages 11 moves radially inward through each of the second refrigerant passages 21. If the refrigerant through the second refrigerant passages 21 reaches the second portion 21d, then the refrigerant is supplied into the slot 41. The second refrigerant passages 21 are connected to all slots 41, so that refrigerant is supplied to all slots 41 by passing through each of the second refrigerant passages 21.

[0066] The refrigerant, upon reaching the second section 21d, moves radially inward while contacting each coil 42, reaching the radially inward end 21b. Since there are no coils 42 near the end 21b of the second refrigerant passage 21, refrigerant is supplied to the space radially inward of the innermost coil 42a. This space is axially continuous, so the refrigerant passes through this space and moves axially to both ends to cool the coils 42.

[0067] As described above, in this embodiment, the first refrigerant passage 11 extending circumferentially and the second refrigerant passage 21 extending radially are formed at different positions in the axial direction. According to this structure, the stator core is not disconnected due to the first refrigerant passage 11 and the second refrigerant passage 21 at the same axial position. (Assuming it is constructed from a single electromagnetic steel sheet...) Figure 7In the case of the first refrigerant passage 11 and the second refrigerant passage 21 shown, the tooth 40 held by the adjacent second refrigerant passage 21 has the second refrigerant passage 21 on both sides in the circumferential direction and the first refrigerant passage 11 on the outer side in the radial direction, but is not connected to other parts. Therefore, the second iron core 20a is composed of multiple disconnected parts.

[0068] However, in this embodiment, the first refrigerant passage 11 is formed in the first iron core 10, and the second refrigerant passage 21 is formed in the second iron core 20. Therefore, the first refrigerant passage 11 does not disconnect the first iron core 10, and the second refrigerant passage 21 does not disconnect the second iron core 20. Thus, according to this embodiment, the stator iron core 100 will not be disconnected by the refrigerant passage.

[0069] Furthermore, in this embodiment, a portion of the second refrigerant passage 21 is formed in the tooth 40. According to this structure, the second refrigerant passage 21 can be opened at any position on the wall of the slot 41, not limited to the radially outer wall of the slot 41. Therefore, refrigerant can be supplied radially to a desired location within the slot 41.

[0070] Furthermore, the second portion 21d of the second refrigerant passage 21 in this embodiment has an opening 21e extending from the wall surface of the slot 41 in the circumferential direction. Therefore, as the refrigerant passes through the second portion 21d of the second refrigerant passage 21, it comes into contact with each coil 42, thereby cooling each coil 42 that is in contact with the opening 21e.

[0071] Furthermore, in this embodiment, the radially inner end 21b of the second refrigerant passage 21 is located radially inner than the innermost coil 42a among the plurality of coils 42 disposed in the slot 41. Moreover, when refrigerant reaches the radially inner end 21b of the second refrigerant passage 21, it flows axially radially inner than the innermost coil 42a. Therefore, the innermost coil 42a can be cooled efficiently. The innermost coil 42a is the coil most prone to heat generation among the plurality of coils 42, so according to this embodiment, the coil most prone to heat generation can be cooled efficiently.

[0072] (3) Other implementation methods, etc.:

[0073] The above embodiment is an example for implementing the present invention, and various other embodiments can also be adopted. For example, the number, size, shape, etc. of the first refrigerant passage 11 and the second refrigerant passage 21 may also differ from the above embodiment. Furthermore, the number of circumferentially oriented first refrigerant passages 11 is preferably less than 1 / 2 of the number of circumferentially oriented slots.

[0074] The second refrigerant passage is not limited to the manner described in the above embodiments. For example, the second refrigerant passage is not limited to a structure in which an opening is formed in the second portion 21d covering a radial arrangement of the plurality of coils 42.

[0075] Specifically, the second refrigerant passage can also be a structure that extends radially inside the tooth and opens into the wall of one side of the slot in the circumferential direction at the radially inner end. Figure 10 This is a diagram illustrating an example of such a second refrigerant passage 210. In Figure 10 In the illustrated embodiment, the structure other than the second refrigerant passage 210 can be implemented using the same structure as in the embodiment described above. In this embodiment, the structure other than the second refrigerant passage 210 uses the same structure as described above. Figures 1-9 The same reference numerals are used for illustration.

[0076] Figure 10 The construction of the second refrigerant passage 210 formed in the second iron cores 20a and 20b and its periphery is shown. The second refrigerant passage 210 is a straight flow path formed at multiple locations separated circumferentially and extending radially. The second refrigerant passage 210 is a flow path for refrigerant that extends at least radially and opens into the slot 41 and the first refrigerant passage 11.

[0077] like Figure 10 As shown, the second refrigerant passage 210 in this embodiment is a generally straight hole with a substantially constant circumferential width and extending radially. The second refrigerant passage 210 axially penetrates the second iron cores 20a and 20b. The radially outer end 21a of the second refrigerant passage 210 overlaps radially with the first refrigerant passage 11. That is, when viewed axially, the end 21a of the second refrigerant passage 210 overlaps with the first refrigerant passage 11, and the second refrigerant passage 210 opens into the first refrigerant passage 11.

[0078] Most of the second refrigerant passage 210 is located further circumferentially than the inner wall of the slot 41 on the circumferential side, and opens into the inner wall of the slot 41 on the circumferential side near the radially inner end 21b. Specifically, the opening 210e of the second refrigerant passage 210 opens radially inward than the innermost coil 42a in the plurality of coils 42 disposed in the slot 41.

[0079] According to the above structure, a refrigerant supplied from the supply port Hr is supplied to the slot 41 through the second refrigerant passage 210, passes through the slot 41, and reaches the axial end of the slot 41. In this embodiment as described above, since the first refrigerant passage 11 is formed on the first iron core 10 and the second refrigerant passage 210 is formed on the second iron core 20, the first refrigerant passage 11 does not disconnect the first iron core 10, and the second refrigerant passage 210 does not disconnect the second iron core 20. Therefore, according to this embodiment, the stator iron core 100 is not disconnected by the refrigerant passage.

[0080] Furthermore, the second refrigerant passage 210 has an opening at its radially inner end. That is, among the plurality of coils 42 disposed in the slot 41, the second refrigerant passage 210 opens radially inner than the innermost coil 42a. Therefore, the coil 42a, which is most prone to heat generation, can be cooled efficiently.

[0081] Furthermore, the coil 42 heats up more easily the further it is radially inward. Therefore, if the structure is configured such that the opening of the second refrigerant passage 210 in the slot 41 is located radially inward than the radial center of the slot 41, refrigerant can be supplied to the space where the coil 42 that heats up is located among the plurality of coils 42.

[0082] In addition, Figure 10 In the illustrated embodiment, the shortest circumferential distance L2 between the unopened wall 41a of the second refrigerant passage 210 and the second refrigerant passage 210 is also greater than or equal to the circumferential width W of the innermost radial tooth 40. Therefore, the second refrigerant passage 210 overlaps with or sandwiches the straight line La on the opposite side of the wall 41a, and the distance between the second refrigerant passage 210 and the wall 41a is greater than or equal to the width W when viewed from any position. Thus, it is possible to prevent magnetic flux entering the interior of the tooth 40 from the rotor from leaking out of the second refrigerant passage 210 to the outside of the tooth 40. As a result, torque reduction is not achieved in the rotating motor.

[0083] Furthermore, the refrigerant flow path extending axially within the slot 41 is not limited to a structure formed radially inner to the coil 42. For example, a gap could be provided circumferentially between the walls of the coil 42 and the slot 41 on both circumferential sides, forming a refrigerant passage. Alternatively, a gap could be provided radially outer between the coil 42 and the slot 41, forming a refrigerant passage.

[0084] Figure 11 This is a diagram illustrating an example of a second refrigerant passage 220 in a structure that forms a refrigerant passage radially outside the coil 42. Figure 11In the illustrated embodiment, the structure other than the second refrigerant passage 220 can be implemented using the same structure as in the embodiment described above. In this embodiment, the structure other than the second refrigerant passage 220 uses the same structure as described above. Figures 1-9 The same reference numerals are used for illustration.

[0085] Figure 11 The construction of a second refrigerant passage 220 formed in the second iron cores 20a and 20b and its periphery is shown. The second refrigerant passage 220 is a flow path formed at multiple locations separated circumferentially and extending radially. The second refrigerant passage 220 is a flow path for refrigerant that extends at least radially and opens into the slot 41 and the first refrigerant passage 11.

[0086] like Figure 11 As shown, the second refrigerant passage 220 in this embodiment is a generally straight hole with a substantially constant circumferential width and extending radially. The second refrigerant passage 220 axially penetrates the second iron cores 20a and 20b. The radially outer end 21a of the second refrigerant passage 220 overlaps radially with the first refrigerant passage 11. That is, when viewed axially, the end 21a of the second refrigerant passage 220 overlaps with the first refrigerant passage 11, and the second refrigerant passage 220 opens into the first refrigerant passage 11.

[0087] The second refrigerant passage 220 does not reach the tooth 40. That is, in the second refrigerant passage 220, the end opposite to the end 21a opens into the radially outer surface 410 of the slot 41, forming an opening 220e. Within the slot 41, the space between the outermost radially arranged coil among the plurality of coils 42 and the radially outer surface 410 of the slot 41 is a refrigerant passage extending axially.

[0088] With the above structure, a refrigerant supplied from the supply port Hr is formed to be supplied to the slot 41 through the second refrigerant passage 220, passing through the slot 41 and reaching the axial end of the slot 41. In this embodiment as described above, since the first refrigerant passage 11 is also formed in the first iron core 10 and the second refrigerant passage 220 is formed in the second iron core 20, the first refrigerant passage 11 does not disconnect the first iron core 10, and the second refrigerant passage 220 does not disconnect the second iron core 20. Therefore, according to this embodiment, the stator iron core 100 is not disconnected by the refrigerant passage.

[0089] In addition, Figure 11In the illustrated embodiment, no second refrigerant passage 220 is formed within the tooth 40. Furthermore, regarding the circumferential width of the tooth 40, the innermost radial width W is the smallest, gradually increasing as it becomes the outermost radial width. Therefore, leakage of magnetic flux entering the interior of the tooth 40 from the rotor to the outside of the tooth 40 can be prevented. As a result, torque reduction is not achieved in the rotating motor.

[0090] The first refrigerant passage only needs to be a refrigerant flow path that extends at least circumferentially. Therefore, a radially extending portion is also possible. Figure 12A This is a diagram showing the structure of the first refrigerant passage 110 having a radially extending portion 110a. Figure 12A It is represented by a solid line as a portion of the second iron core having the second refrigerant passage 230, and as... Figure 7 The diagram shows the first refrigerant passage 110 represented by overlapping dashed lines. Figure 12A The first refrigerant passage 110 shown has a circumferentially extending portion and a radially extending portion 110a. The second refrigerant passage 230, when viewed axially, only needs to overlap with the first refrigerant passage 110, although... Figure 7 The second refrigerant passage 21 shown is short, but its radially outer end 21a overlaps with a portion 110a of the first refrigerant passage 110. Therefore, the refrigerant flowing into the first refrigerant passage 110 also flows into the second refrigerant passage 230 through portion 110a.

[0091] The second refrigerant passage need only be a refrigerant flow path that extends at least radially. Therefore, it can also have a portion that extends circumferentially. Figure 12B This is a diagram showing the structure of the second refrigerant passage 240 having a portion 240a extending circumferentially. Figure 12B This is a diagram showing a portion of a second iron core having a second refrigerant passage 240. Figure 12B The second refrigerant passage 240, as shown, extends linearly from the radially outer end 21a toward the radially inner side, and bends toward the slot 41 in a portion 240a inside the tooth 40. The portion 240a opens toward the slot 41. The second refrigerant passage 240 also has a portion 240b extending radially inward, reaching a point radially inward beyond the coil 42. Even with this configuration, refrigerant can be supplied to the slot 41 from the first refrigerant passage through the second refrigerant passage 240.

[0092] Furthermore, a circumferentially protruding protrusion may also be formed on the radially inner side of tooth 40. Figure 12CThe diagram shows a tooth 40 with a protrusion 40a. Furthermore, the protrusion is a portion that protrudes circumferentially further than the radially extending dotted line. If the tooth 40 has the protrusion 40a, the circumferential length of the radially inner portion of the tooth 40 increases compared to the case without the protrusion 40a. However, considering the magnetic flux entering the tooth 40 from the rotor, the amount of magnetic flux depends on the width W of the narrowest part of the tooth 40. Therefore, when comparing the unopened wall 41a of the second refrigerant passage 21, the circumferential distance to the second refrigerant passage 21, and the circumferential width of the radially innermost tooth 40, only the following needs to be considered... Figure 12C The width W of the narrowest part shown is sufficient. That is, the circumferential width of the innermost radial tooth 40 is the width W of the portion excluding the protrusion 40a. Furthermore, the circumferential distance between the unopened wall surface 41a of the second refrigerant passage 21 and the second refrigerant passage 21 is only required to be greater than or equal to the width W.

[0093] A stator core is simply a ring-shaped component having multiple teeth arranged circumferentially but not connected radially inward, and multiple slots formed between the teeth circumferentially. The stator core simply needs to be fixed to a stationary part and allow a magnetic field to act on the rotor. The stator core is typically a ring-shaped component with multiple teeth.

[0094] Multiple teeth can be formed as long as they are arranged circumferentially, and their shape is not limited. They are not connected radially inward. That is, if the teeth are connected radially inward, the electromagnet plate is not broken radially or circumferentially. Therefore, teeth that are not connected radially inward are considered acceptable. The teeth can be any part where the coil is wound or arranged; their number and size are not limited. Furthermore, the stator core is ring-shaped, but the shape of the ring, such as the outer circumference or inner circumference, is not limited; the outer circumference can also be polygonal. The slots can be any space formed between the teeth, as long as it is a space for arranging the coil; their number and size are not limited.

[0095] The first refrigerant passage only needs to be formed radially outward from the slot and radially inward from the outermost surface of the stator core. That is, the first refrigerant passage is inside the stator core and formed radially outward from the slot. Furthermore, the first refrigerant passage is a refrigerant flow path extending at least circumferentially, and only needs to be formed at multiple circumferentially separated locations. That is, it only needs to be configured such that forming the first refrigerant passage at circumferentially separated locations does not break the stator core circumferentially.

[0096] Furthermore, the first refrigerant passages are preferably formed at multiple locations at different axial positions, and if the first refrigerant passages formed at each location overlap, they cover the entire circumference. Even if the entire circumference is not covered, a structure can be adopted where the number of second refrigerant passages connected to the first refrigerant passages is greater than in the above embodiment, allowing refrigerant to flow to all slots in the circumference. The first refrigerant passages only need to be a space extending at least circumferentially, but can also have portions extending radially or axially. Moreover, the shape, size, and number of the first refrigerant passages are not limited and can be implemented in various ways.

[0097] The second refrigerant passage only needs to be configured such that, although it is formed at a different position axially from the first refrigerant passage, the stator core is not interrupted by either the first or second refrigerant passage within the same plane perpendicular to the axial direction. The second refrigerant passage has a portion opening into the first refrigerant passage, thus connecting to it at least partially. The second refrigerant passage only needs to be a space extending at least radially, but it can also have portions extending circumferentially or axially. Furthermore, the shape, size, and number of the second refrigerant passages are not limited and can be implemented in various ways. For example, it could be a branch of the second refrigerant passage opening into the first refrigerant passage, or a structure opening into multiple slots.

Claims

1. A stator core, characterized in that it is an annular stator core having a plurality of teeth arranged circumferentially but not connected radially inward, and a plurality of slots formed circumferentially between the teeth, wherein... On a surface that is radially outer of the aforementioned slot and radially inner of the aforementioned stator core, at multiple locations separated in the circumferential direction, refrigerant flow paths, i.e., first refrigerant passages, are formed, extending at least in the circumferential direction. In the axial direction at a position different from the first refrigerant passage, a refrigerant flow path, namely a second refrigerant passage, is formed at multiple positions that are circumferentially separated, extending at least radially and opening in the slot and the first refrigerant passage.

2. The stator core according to claim 1, characterized in that, A portion of the aforementioned second refrigerant passage is formed in the aforementioned tooth.

3. The stator core according to claim 1 or 2, characterized in that, The opening of the second refrigerant passage in the slot is located radially inward from the radial center of the slot.

4. The stator core according to claim 1 or 2, characterized in that, The second refrigerant passage opens in the circumferential direction on one side of the wall of the slot that holds the teeth. The distance between the unopened wall of the second refrigerant passage and the second refrigerant passage in the circumferential direction is greater than or equal to the circumferential width of the innermost tooth in the radial direction.

5. The stator core according to claim 1 or 2, characterized in that, The aforementioned second refrigerant passage includes: A first portion extending radially outward from the aforementioned slot; and a second portion connected to the first portion and extending radially inward, having a radially extending opening on one side of the wall of the aforementioned slot in the circumferential direction.

6. The stator core according to claim 1 or 2, characterized in that, The second refrigerant passage extends radially inside the tooth and opens into the wall of one side of the slot in the circumferential direction at the radially inner end.

7. The stator core according to claim 1, characterized in that, The second refrigerant passage opens to the radially outer surface of the slot.

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