Stator for rotary electric machine

Abstract

To efficiently cool a stator coil by a refrigerant when the refrigerant is supplied to a stator from above during operation of a rotary electric machine.SOLUTION: A stator core 5 is disposed such that a shaft direction thereof coincides with a horizontal direction, and includes: an annular yoke 9; a plurality of teeth 10; and a plurality of slots 11 formed between respective teeth 10. A cuff support 7 covers both ends of the stator core 5 in the shaft direction, and includes a partition piece 73 provided corresponding to a position of the teeth 10 and an opening 74 provided corresponding to a position of the slot 11. A stator coil 3 passes through the slot 11 and the opening 74 and is wound about the teeth 11 and the partition piece 73. At the time of cooling by causing a refrigerant to flow from above in a gravity direction during rotation operation, the refrigerant is introduced by providing a groove portion 14 that opens in an outer periphery of the cuff support 7 and communicates with a slot bottom portion 111 of the slot 11.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a stator of a rotating electrical machine.

Background Art

[0002] In recent years, further miniaturization and higher output of rotating electrical machines have been demanded. When a rotating electrical machine is miniaturized and has higher output, while the heat capacity of the rotating electrical machine decreases, the amount of heat generation increases. Therefore, the temperature rise of the rotating electrical machine becomes a major problem. In particular, the stator coil in the slot generates a large amount of heat and is difficult to dissipate heat. Therefore, it is necessary to efficiently cool the stator coil.

[0003] In a stator of a rotating electrical machine in which refrigerant is supplied from above in the direction of gravity during operation of the rotating electrical machine, a structure that can efficiently cool the stator coil with the refrigerant is desired. As a conventional rotating electrical machine cooling structure, there are a plurality of cooling holes penetrating from the outer peripheral surface of the stator core to the slot, a refrigerant supply mechanism that supplies liquid refrigerant to a supply cooling hole whose radially outer end is located above the radially inner end in the direction of gravity, and a refrigerant guide that is interposed between the rotor and the stator, catches the liquid refrigerant that falls through the slot from the radially inner end of the supply cooling hole, and guides it to the lower slot (see Patent Document 1).

[0004] Furthermore, there has been a stator of a rotating electrical machine in which a gap is formed between the inner peripheral ends of the slot and the opening and the innermost coil, and the cuffs are continuous radially inside each gap at the upper part of the stator core in the direction of gravity and have inner ribs protruding axially outward from the stator core, and are continuous radially outside each gap at the lower part of the stator core in the direction of gravity and have outer ribs protruding axially outward from the stator core (see Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the above Patent Document 1, since the through-hole serving as the refrigerant passage obstructs the flow of magnetic flux passing through the inside of the stator core, there are problems such as deterioration in performance and further increase in the size of the motor. In addition, there is a problem that it is necessary to additionally process the through-hole or mold it with a mold, resulting in high costs.

[0007] Furthermore, in the above Patent Document 2, since the refrigerant flows out from the inner peripheral side of the stator into the air gap portion, which is the gap between the rotor and the stator, there is a problem that the refrigerant infiltrates into the gap with the rotor, increasing the rotational loss of the rotor.

[0008] The present disclosure discloses a technique for solving the above problems, and aims to efficiently cool the stator coil with refrigerant in a stator of a rotating electrical machine in which refrigerant is supplied from above during operation of the rotating electrical machine.

Means for Solving the Problems

[0009] The stator of the rotating electrical machine of the present disclosure is arranged such that the axial direction coincides with the horizontal direction, and includes an annular yoke, a plurality of teeth protruding inward from the inner peripheral surface of the yoke, a stator core having a plurality of slots formed between the respective teeth, a cuff that covers both axial ends of the stator core and has partition pieces provided corresponding to the positions of the teeth and openings provided corresponding to the positions of the slots, a stator coil wound around the teeth and the partition pieces through the slots and the openings, and is cooled by flowing refrigerant from the upper side in the direction of gravity during operation. A first groove portion for introducing the refrigerant that opens to the outer periphery of the cuffsa and communicates with the slot bottom of the slot is provided. In addition, a stator of another rotating electrical machine according to the present disclosure is arranged such that the axial direction coincides with the horizontal direction, and includes an annular yoke, a plurality of teeth protruding inward from the inner peripheral surface of the yoke, and a stator core having a plurality of slots formed between the respective teeth. A cuffsa that covers both axial ends of the stator core and has a partition piece provided corresponding to the position of the teeth and an opening provided corresponding to the position of the slot. It has a stator coil wound around the teeth and the partition piece through the slot and the opening. During operation, the refrigerant flows from the upper side in the direction of gravity for cooling. A through hole for introducing the refrigerant that communicates from the outer periphery of the cuffsa to the slot bottom of the slot is provided.

Advantages of the Invention

[0010] According to the stator of the rotating electrical machine of the present disclosure, in the stator of the rotating electrical machine in which the refrigerant is supplied from the upper side during the operation of the rotating electrical machine, the stator coil can be efficiently cooled by the refrigerant.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

MODE FOR CARRYING OUT THE INVENTION

[0012] Embodiment 1. This embodiment relates to a cooling structure in a stator of a rotating electrical machine. FIG. 1 is a perspective view showing the rotor in the rotating electrical machine according to Embodiment 1, and FIG. 2 is a perspective view showing the stator in the rotating electrical machine according to Embodiment 1. In each figure, the axial direction, the radial direction, and the circumferential direction respectively mean the axial direction, the radial direction, and the circumferential direction of the rotating electrical machine, the gravitational direction coincides with the radial direction, and the horizontal direction coincides with the axial direction.

[0013] The rotating electrical machine is housed within a case (not shown). The rotating electrical machine includes a rotor 1 and a stator 2. The rotor 1 is connected to a horizontal drive shaft (not shown) that is rotatably supported with respect to the case, and a plurality of permanent magnets (not shown) are arranged circumferentially on the rotor 1. The stator 2 has an air gap for arranging the rotor 1 on the inner peripheral side, and is held by the case in a state of being disposed opposite to the rotor 1. The actual rotating electrical machine is configured by inserting the rotor 1 shown in FIG. 1 into the inner peripheral side of the stator 2 shown in FIG. 2. The stator 2 includes a stator coil 3 as will be described later. A drive current is supplied to the stator coil 3, and the rotor 1 rotates with respect to the stator 2 due to the electromagnetic force generated in the stator coil 3 by this drive current.

[0014] Since the rotating electrical machine becomes hot when operating as a motor or a generator, it is cooled by a refrigerant. A pipe 4 is arranged within the case. The pipe 4 extends in the axial direction (horizontal direction) of the stator core 5 above the rotating electrical machine in the direction of gravity, and has a plurality of discharge holes 6. The refrigerant supplied into the pipe 4 is discharged from the plurality of discharge holes 6, and the refrigerant flows downward in the direction of gravity while contacting the rotating electrical machine, cooling the components of the rotating electrical machine including the stator coil 3. Note that, for example, a cooling oil called ATF (Automatic Transmission Fluid) is used as the refrigerant.

[0015] Next, the stator of the rotating electrical machine according to the present embodiment will be described in detail. FIG. 3 is an exploded perspective view showing the stator according to the present embodiment, FIG. 4 is an enlarged perspective view showing part A in FIG. 3, and FIG. 5 is an enlarged plan view showing part B in FIG. 3. As shown in FIG. 3, the stator 2 includes a stator core 5 arranged such that the axial direction coincides with the horizontal direction, two cuffs 7 covering both axial ends of the stator core 5, and a stator coil 3 (composed of a plurality of coil segments 8) wound around the stator core 5. Note that the two cuffs 7 have the same shape and are arranged on the stator core 5 so as to be symmetric with respect to the stator core 5.

[0016] The stator core 5 is composed of a number of electromagnetic steel sheets laminated together. The stator core 5 includes an annular yoke 9 and a plurality of teeth 10 protruding inward from the inner peripheral surface of the yoke 9. The plurality of teeth 10 are arranged at equal intervals from each other in the stator circumferential direction. Slots 11 are formed between the teeth 10 adjacent to each other in the stator circumferential direction, and the plurality of slots 11 are arranged at equal intervals from each other in the stator circumferential direction. Each tooth 10 and each slot 11 extend along the stator axial direction. A slot bottom 111 exists at the outermost peripheral portion of the slot 11.

[0017] Cuffs 7 are mounted on one axial end face and the other axial end face of the stator core 5, respectively. The cuffs 7 are composed of insulating resin molding members, for example, formed from epoxy resin. As shown in FIG. 5, the cuff 7 includes an outer annular plate 71 in contact with the axial end face of the yoke 9 of the stator core 5, an inner annular plate 72 in contact with the axial end face at the inner peripheral side tip of the tooth 10 of the stator core 5, and a plurality of partition pieces 73 connecting the outer annular plate 71 and the inner annular plate 72. The partition pieces 73 are provided corresponding to the teeth 10 of the stator core 5, are arranged at equal intervals from each other in the circumferential direction in the same manner as the teeth 10, and cover the teeth 10. An opening 74 is formed between adjacent partition pieces 73, and this opening 74 corresponds to the position of the slot 11 of the stator core 5. Further, an outer circumference 75 is formed on the cuff 7.

[0018] As shown in FIG. 3, the stator coil 3 is composed of a plurality of coil segments 8. Although only one coil segment 8 is shown in FIG. 3, there are a number of coil segments 8, and they are inserted into all the slots 11 of the stator core 5. The coil segment 8 is formed in a U shape and includes two straight legs 81 and a curved portion 82 connecting them. The legs 81 of the coil segment 8 are inserted into the opening 74 of the cuff 7 on one side (the right side in FIG. 3), the slot 11 of the stator core 5, and the opening 74 of the cuff 7 on the other side (the left side in FIG. 3), and the portion of the leg 81 protruding from the opening 74 of the cuff 7 on the other side (the left side in FIG. 3) is bent and joined to the legs 81 of other coil segments 8. Thus, the stator coil 3 is formed. Insulating paper 12 is inserted between the legs 81 of the coil segment 8 forming the stator coil 3 and the stator core 5 to prevent damage to the insulating coating of the stator coil 3 caused by the stator coil 3 coming into direct contact with the stator core 5 and to suppress a decrease in insulating performance due to a reduction in the coating thickness.

[0019] The partition piece 73 of the cuff 7 prevents damage to the insulating coating of the coil caused by the stator coil 3 coming into direct or indirect contact with the corner of the stator core 5 through the insulating paper 12 when inserting or forming the stator coil 3 into the stator core 5, and suppresses a decrease in insulating performance due to a reduction in the coating thickness. Further, on the anti-wiring side, it defines the axial position of the stator coil 3, and on the wiring side, it acts as a bending fulcrum when bending the leg 81 of the coil segment 8. Also, when vibration is applied to the stator 2, it also has a function of protecting so that the stator coil 3 and the stator core 5 do not come into contact.

[0020] FIG. 6 is a plan view schematically showing the structure of the axial end portions of the stator core and the end caps, FIG. 7 is an enlarged perspective view showing a portion C in FIG. 6, and FIG. 8 is a partially enlarged plan view schematically showing the structure of the axial end portions of the stator core and the end caps. In FIGS. 6 to 8, with respect to the stator coil 3, the coil ends are omitted, and the coil cross section at the axial end portion of the slot 11 of the stator core 5 is shown. In the following, with reference to FIGS. 6 to 8, one axial end portion of the stator core 5 will be described, but the other axial end portion of the stator core 5 has the same structure.

[0021] As shown in FIGS. 6 to 8, a groove portion (first groove portion) 14 is formed in the outer periphery 75 of the end cap 7. The groove portion 14 opens from the outer periphery 75 side of the end cap 7 and is formed to communicate with the slot bottom 111 of the stator core 5. In the present embodiment, the groove portion 14 is provided, but instead of the groove portion 14, a through hole communicating from the outer periphery 75 of the end cap 7 to the slot bottom 111 of the stator core 5 may be used.

[0022] As shown in FIG. 6, during the operation of the rotating electrical machine, the refrigerant is discharged from the discharge hole 6 of the pipe 4, and the rotating electrical machine is cooled by receiving the refrigerant from the upper side in the gravity direction. In FIG. 6, the flow of the refrigerant is indicated by a broken line. The refrigerant flows between the outer periphery 75 of the end cap 7 and the inner periphery of the case member 15 on the end face of the yoke 9 at the axial end portion of the stator core 5. At this time, the refrigerant flows into the groove portion 14 on the outer periphery side of the end cap 7, and the refrigerant is introduced to the inner periphery side of the stator 2 along the groove portion 14 and flows into the slot 11 of the stator core 5. Thereby, the refrigerant is guided into the slot 11, and by directly cooling the stator coil 3 inside the slot 11, the stator coil 3 can be efficiently cooled.

[0023] In this embodiment, the refrigerant is made to flow into the slot 11 from the side of the slot bottom 111. In the slot 11, there are a stator coil 3, insulating paper 12, and a resin 16 (see FIG. 8) that fills the gaps between them. Therefore, the refrigerant flowing in from the slot bottom 111 has a structure that makes it difficult to move to the inner peripheral side inside the slot 11. As a result, the refrigerant is prevented from flowing into the air gap portion 18, which is the gap between the rotor 1 from the inner opening 17 while passing through the slot 11, and the mechanical loss of the rotor 1 generated when the refrigerant flows into the air gap portion 18 can be reduced.

[0024] FIG. 9 is a perspective view showing the stator and shows the state of the refrigerant flow. The refrigerant flows through the slot from the inlet side 200 as shown by the dotted arrow 400 and flows out from the outlet side 300. As described above, according to this embodiment, the refrigerant flowing through the yoke 9 flows into the slot 11 through the groove portion 14 provided on the outer peripheral portion of the cuff, so that the stator coil 3 can be efficiently cooled.

[0025] Embodiment 2. FIG. 9 is a perspective view showing the stator according to Embodiment 2 and shows the state of the refrigerant flow. The refrigerant flows through the slot from the inlet side 200 as shown by the dotted arrow 400 and flows out from the outlet side 300. As shown in FIG. 9, for the stator shown in Embodiment 1, in order to introduce the refrigerant more efficiently into the slot, one axial direction can be the refrigerant inlet 200 and the other can be the refrigerant outlet 300. Furthermore, the arrangement of the refrigerant inlet and the refrigerant outlet may be appropriately changed according to the conditions of peripheral components or the environment. For example, when the vehicle climbs or descends a slope, the positional relationship between the connection side and the non-connection side with respect to the gravitational direction is reversed, so it is assumed that the refrigerant inlet and the refrigerant outlet are reversed accordingly.

[0026] Embodiment 3. FIG. 10 is a partially enlarged plan view schematically showing the structure of the axial end portions of the stator core and the cuffs according to Embodiment 3. As shown in FIG. 10, in the cuff 7 in which the partition pieces 73 project in the inner circumferential direction from the outer annular plate 71, the circumferential width W1 of the partition piece joint (projection) 731, which is the joint portion of the partition piece 73 with the outer annular plate 71, is formed to be larger than the circumferential width W2 of the partition piece 73. And the circumferential width H of the gap between the partition piece joints 731 of two adjacent partition pieces 73 sandwiching the slot 11 is formed to be smaller than the circumferential width dimension L of the stator coil 3. Further, the partition piece joint 731 is formed to project inward from the slot bottom 111.

[0027] Thereby, the outermost peripheral coil 31 disposed in the slot 11 is fixed to the inner circumferential side with respect to the slot bottom 111 by the partition piece joint 731 in the cuff 7, and a gap 1000 is formed between the two partition piece joints 731 adjacent to the left and right of the slot 11 and the slot bottom 111. Such a gap 1000 serves as a flow path for the refrigerant guided by the structure shown in Embodiment 1, enabling more efficient cooling of the rotating electric machine.

[0028] In the present embodiment, by providing a projection (partition piece joint 731) on the outer peripheral side inside the slot 11, it is possible to prevent the stator coil 3 and the insulating paper 12 from bulging outward, and to surely create the gap 1000 shown in FIG. 10 on the outer peripheral side in the slot. Since this projection serves as a stopper inside the slot 11, the stator coil 3 and the insulating paper 12 are restricted from moving to the outer peripheral side of the partition piece joint 731, a gap 1000 is generated between the partition piece joints 731, and this gap 1000 can be used as a flow path for the refrigerant. Furthermore, since the function of the projection is to regulate the positions of the stator coil 3 and the insulating paper 12 on the outer peripheral side, it is possible to achieve the same function by adding other parts inside the slot 11 or adding new parts.

[0029] That is, in the above, the position of the stator coil 3 in the slot 11 is regulated by the cuffs 7, but as shown in FIG. 11, it may be regulated by the stator core 5. In FIG. 11, a tooth joint portion 101, which is a joint portion of the teeth 10 with the yoke 9, is formed. The circumferential width H1 of the gap between two adjacent tooth joint portions 101 sandwiching the slot 11 is formed smaller than the circumferential width dimension L of the stator coil 3. Also, the circumferential width W3 of the tooth joint portion 101 is formed larger than the circumferential width W2 of the teeth 10. Further, the tooth joint portion 101 is formed to protrude inward from the slot bottom 111. Then, the position of the stator coil 3 and the insulating paper 12 is regulated on the outer peripheral side by the tooth joint portion 101. Furthermore, it may be regulated by adding another member or the like.

[0030] Embodiment 4. FIG. 12 is a partially enlarged plan view schematically showing the structure of the axial end portions of the stator core and the cuffs according to Embodiment 4, and FIG. 13 is a perspective view of the same. In the groove portion 14 of the cuffs 7 shown in Embodiment 1, the axial height of the groove wall 141 on the lower side in the gravitational direction is formed higher than the axial height of the groove wall on the upper side in the gravitational direction. Thereby, it is possible to prevent the refrigerant introduced into the groove portion 14 from overcoming the groove wall 141 and falling downward in the gravitational direction. Thereby, more refrigerant can be introduced into the slot 11, and more efficient cooling becomes possible.

[0031] Embodiment 5. FIG. 14 is a partially enlarged plan view schematically showing the structure of the axial end portions of the stator core and the cuffs according to Embodiment 5. As shown in FIG. 14, a gap 1001 is provided between the outermost peripheral coil 31 inside the slot 11 and the insulating paper 12 existing on the slot bottom 111. That is, a gap 1001 is provided between the stator coil 3 and the insulating paper 12 on the outer side in the radial direction inside the slot. Thereby, since the refrigerant passes through the gap 1001, more efficient cooling becomes possible.

[0032] Embodiment 6. In order to more reliably introduce the refrigerant into the inside of the slot 11, a part of the cuff 7 may be configured to be inserted into the inside of the slot 11 in the axial direction. That is, in FIG. 10, the partition piece joint portion 731, which is the joint portion between the outer annular plate 71 of the cuff 7 and the partition piece, is configured to extend in the axial direction, and the partition piece joint portion 731 is configured to enter the inside of the slot 11. By guiding the refrigerant to the inside of the slot 11 in this way, the refrigerant can be more reliably introduced into the inside of the slot 11.

[0033] Embodiment 7. FIG. 15 is a plan view schematically showing the structure of the axial end portions of the stator core and the cuff according to Embodiment 7. As shown in FIG. 15, the groove portions 14 in the cuff 7 are arranged symmetrically with respect to the central axis X in the gravitational direction. In FIG. 15, 151 is the inner peripheral portion of the case member. Thereby, it becomes possible to reliably collect the refrigerant flowing from the upper side in the gravitational direction toward the lower side in the gravitational direction evenly on the left and right. Therefore, it is possible to prevent unevenness in the temperature of the stator coils 3 arranged on both the left and right sides. Furthermore, it is possible to suppress either one of the stator coils 3 arranged on both the left and right sides from becoming high temperature.

[0034] Embodiment 8. FIG. 15 is a plan view schematically showing the structure of the axial end portions of the stator core and the cuff according to Embodiment 8, and FIG. 16 is an enlarged perspective view showing a portion D in FIG. 15. As shown in FIGS. 15 and 16, in the outer annular plate 71 of the cuff 7, at least a part on the lower side in the gravitational direction is formed such that the outer diameter dimension of the cuff 7 is larger than the outer diameter dimension of the cuff 7 on the upper side in the gravitational direction. And in the outer annular plate 71 on the lower side in the gravitational direction, a groove portion (second groove portion) 142 that opens upward in the gravitational direction is formed, and the groove portion 142 communicates with the slot 11 of the stator core 5. Thereby, in at least a part on the lower side in the gravitational direction of the cuff 7, the space of the gap between the outer periphery 75 of the cuff 7 and the inner peripheral portion 151 of the case member becomes narrower than the gap on the upper side in the gravitational direction. Thereby, the refrigerant flowing to the yoke 9 on the lower side in the gravitational direction can flow through the groove portion 142 formed in the outer annular plate 71 on the lower side in the gravitational direction of the cuff 7 and opening upward in the gravitational direction, and can be introduced into the slot 11 on the lower side in the gravitational direction.

[0035] The refrigerant flowing from the upper side to the lower side in the gravitational direction flows on the inner peripheral side of the case member 15 in the lower portion in the gravitational direction of the stator 2, so it becomes difficult to introduce the refrigerant into the inside of the slot 11. However, by providing the shape as shown above on the lower side in the gravitational direction of the cuff 7, the refrigerant can be surely recovered on the lower side in the gravitational direction and introduced into the slot 11. Therefore, the stator coil 3 on the lower side in the gravitational direction can also be efficiently cooled.

[0036] Although various exemplary embodiments and examples are described in the present disclosure, the various features, aspects, and functions described in one or more of the embodiments are not limited to the application of a specific embodiment, but are applicable to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are envisioned within the scope of the technology disclosed in this specification. For example, it includes the case where at least one component is deformed, added, or omitted, and further, the case where at least one component is extracted and combined with the components of other embodiments.

[0037] Hereinafter, aspects of the present disclosure will be appended and described collectively.

[0038] (Appendix 1) It is arranged such that the axial direction coincides with the horizontal direction, and includes an annular yoke, a plurality of teeth protruding inward from the inner peripheral surface of the yoke, and a stator core having a plurality of slots formed between the respective teeth, a cuff that covers both axial ends of the stator core and has partition pieces provided corresponding to the positions of the teeth and openings provided corresponding to the positions of the slots, a stator coil wound around the teeth and the partition pieces through the slots and the openings, a stator of a rotating electrical machine that is cooled by flowing refrigerant from the upper side in the direction of gravity during operation, a stator of a rotating electrical machine provided with a first groove portion for introducing the refrigerant that opens to the outer periphery of the cuff and communicates with the bottom of the slot. (Appendix 2) The stator of the rotating electrical machine according to Appendix 1, wherein the stator coil, insulating paper, and resin filling the gaps between them are present in the slot. (Appendix 3) The stator of the rotating electrical machine according to Appendix 2, wherein a gap is provided between the stator coil and the insulating paper on the radially outer side inside the slot. (Appendix 4) The stator of the rotating electrical machine according to any one of Appendices 1 to 3, wherein one axial side is a refrigerant inlet and the other axial side is a refrigerant outlet. (Appendix 5) In the cuff, the partition pieces protrude in the inner circumferential direction from the outer annular plate, the circumferential width of the partition piece joint portion, which is the joint portion of the partition piece with the outer annular plate, is formed larger than the circumferential width of the partition piece, the gap between the partition piece joint portions is formed smaller than the circumferential width of the stator coil, and the partition piece joint portion is formed to protrude inward from the bottom of the slot. The stator of the rotating electrical machine according to any one of Appendices 1 to 4. (Appendix 6) The circumferential width of the tooth joint portion, which is the joint portion between the teeth and the yoke in the teeth, is formed to be larger than the circumferential width of the teeth. The circumferential width of the gap between the tooth joint portions is formed to be smaller than the circumferential width of the stator coil. Further, the tooth joint portion is formed to project inward from the bottom of the slot. The stator of the rotating electrical machine according to any one of Appendices 1 to 4. (Appendix 7) The axial height of the groove wall on the lower side in the gravity direction is formed to be higher than the axial height of the groove wall on the upper side in the gravity direction. The stator of the rotating electrical machine according to any one of Appendices 1 to 6. (Appendix 8) A part of the cuffsa is inserted into the axial inside of the slot. The stator of the rotating electrical machine according to any one of Appendices 1 to 7. (Appendix 9) The plurality of first groove portions are arranged symmetrically with respect to the central axis in the gravity direction. The stator of the rotating electrical machine according to any one of Appendices 1 to 8. (Appendix 10) In at least a part of the lower side in the gravity direction of the cuffsa, the gap between the outer periphery of the cuffsa and the inner peripheral portion of the case member covering the periphery of the stator core is narrower than the gap between the outer periphery of the cuffsa on the upper side in the gravity direction and the inner peripheral portion of the case member. The stator of the rotating electrical machine according to any one of Appendices 1 to 9. (Appendix 11) In at least a part of the lower side in the gravity direction, the outer diameter dimension of the cuffsa is formed to be larger than the outer diameter dimension of the cuffsa on the upper side in the gravity direction, and On the outer annular plate on the lower side in the gravity direction, a second groove portion that opens upward in the gravity direction is formed, and the second groove portion communicates with the slot. The stator of the rotating electrical machine according to any one of Appendices 1 to 10. (Appendix 12) It is arranged so that the axial direction coincides with the horizontal direction, and includes an annular yoke, a plurality of teeth protruding inward from the inner peripheral surface of the yoke, and a stator core having a plurality of slots formed between the respective teeth. A cuffer that covers both axial ends of the stator core and has partition pieces provided corresponding to the positions of the teeth and openings provided corresponding to the positions of the slots, A stator coil wound around the teeth and the partition pieces, passing through the slots and the openings, A stator of a rotating electrical machine that is cooled by flowing refrigerant from the upper side in the direction of gravity during operation, A stator of a rotating electrical machine provided with a through hole for introducing the refrigerant that communicates from the outer periphery of the cuffer to the slot bottom of the slot.

Explanation of Signs

[0039] 2 Stator, 3 Stator coil, 5 Stator core, 7 Cuffer, 9 Yoke, 10 Teeth, 11 Slots, 12 Insulating paper, 14 First groove portion, 15 Case member, 16 Resin, 71 Outer annular plate, 73 Partition piece, 74 Opening, 75 Outer periphery, 101 Tooth joint portion, 111 Slot bottom, 141 Groove wall, 142 Second groove portion, 151 Inner peripheral portion of the case member, 200 Refrigerant inlet, 300 Refrigerant outlet, 731 Partition piece joint portion, 1001 Gap.

Claims

1. a stator core arranged so that its axial direction coincides with a horizontal direction, the stator core having an annular yoke, a plurality of teeth protruding inward from an inner peripheral surface of the yoke, and a plurality of slots formed between the teeth; cuffs covering both axial ends of the stator core and having partition pieces provided corresponding to the positions of the teeth and openings provided corresponding to the positions of the slots; a stator coil passing through the slots and the openings and wound around the teeth and the partition pieces; A stator of a rotating electric machine that is cooled by flowing a refrigerant from above in the direction of gravity during operation, a first groove portion for introducing the refrigerant, the first groove portion opening on an outer periphery of the cuff and communicating with a slot bottom of the slot;

2. 2. The stator of claim 1, wherein the slots contain the stator coil, insulating paper, and a resin filling a gap therebetween.

3. 3. The stator of claim 2, wherein a gap is provided between the stator coil and the insulating paper on a radially outer side of the inside of the slot.

4. 3. The stator for a rotating electric machine according to claim 1, wherein one axial side of the stator is a refrigerant inlet and the other axial side of the stator is a refrigerant outlet.

5. A stator for a rotating electric machine as described in claim 1 or claim 2, wherein the partition pieces protrude inwardly from the outer annular plate of the cuff, the circumferential width of the partition piece joints, which are the joints of the partition pieces with the outer annular plate, are formed larger than the circumferential width of the partition pieces, the gaps between the partition piece joints are formed smaller than the circumferential width of the stator coil, and the partition piece joints are formed so as to protrude inwardly from the bottom of the slot.

6. 3. A stator for a rotating electric machine as described in claim 1 or claim 2, wherein the circumferential width of the teeth joints, which are the joints between the teeth and the yoke, is formed larger than the circumferential width of the teeth, and the circumferential width of the gaps between the teeth joints is formed smaller than the circumferential width of the stator coil, and further the teeth joints are formed so as to protrude inward from the bottom of the slot.

7. 3. The stator for a rotating electric machine according to claim 1, wherein the axial height of the groove wall on the lower side in the direction of gravity is greater than the axial height of the groove wall on the upper side in the direction of gravity.

8. 3. The stator for a rotating electric machine according to claim 1, wherein a portion of said cuff member is inserted axially inside said slot.

9. 3. The stator for a rotating electric machine according to claim 1, wherein the first groove portions are arranged symmetrically with respect to a central axis in a gravity direction.

10. 3. The stator of claim 1, wherein in at least a portion of a lower side of the cuff member in the direction of gravity, a gap between an outer periphery of the cuff member and an inner periphery of a case member covering the stator core is narrower than a gap between an outer periphery of the cuff member and an inner periphery of the case member on an upper side in the direction of gravity.

11. At least a part of the cuffs on a lower side in the direction of gravity is formed so that an outer diameter dimension of the cuffs is larger than an outer diameter dimension of the cuffs on an upper side in the direction of gravity, 3. The stator of claim 1, wherein a second groove portion is formed in the outer annular plate on the lower side in the direction of gravity, the second groove portion being open toward the upper side in the direction of gravity, and the second groove portion is connected to the slot.

12. a stator core arranged so that its axial direction coincides with a horizontal direction, the stator core having an annular yoke, a plurality of teeth protruding inward from an inner peripheral surface of the yoke, and a plurality of slots formed between the teeth; cuffs covering both axial ends of the stator core and having partition pieces provided corresponding to the positions of the teeth and openings provided corresponding to the positions of the slots; a stator coil passing through the slots and the openings and wound around the teeth and the partition pieces; A stator of a rotating electric machine that is cooled by flowing a refrigerant from above in the direction of gravity during operation, a through hole for introducing the coolant, the through hole communicating from an outer periphery of the cuff to a slot bottom of the slot;

Images