motor

Abstract

To provide a motor with a simple structure that allows for efficient stator cooling. [Solution] The motor of the present invention is a motor having a stator 1, the stator 1 comprising a stator core 10 and a coil 20 provided on the stator core 10, the stator core 10 comprising a plurality of teeth 11B provided in the circumferential direction and projecting radially inward and extending in the axial direction, a space between the plurality of teeth 11B formed in the circumferential direction and a slot 11C for arranging the coil wires of the coil 20 that extends in the axial direction, a circumferential refrigerant flow path 12B provided in a part of the axial direction and without teeth 11B, and a radial refrigerant flow path 12A that opens to the outer surface side of the stator core 10 and connects from the outer surface of the stator core 10 to the circumferential refrigerant flow path 12B.

Description

Technical Field

[0005] , ,

[0006]

[0001] The present disclosure relates to a motor having a stator.

Background Art

[0002] Patent Document 1 discloses a stator of a rotating electrical machine that can appropriately cool a coil disposed inside a slot. The stator includes an annular stator yoke, a plurality of teeth protruding from the stator yoke toward the inner diameter side, a plurality of slots formed between adjacent teeth, a stator core having the above components, and a plurality of coils disposed in each slot. In the stator core, a refrigerant distribution plate having an annular shape is interposed so as to surround a plurality of coils from the outer peripheral side, and the refrigerant distribution plate is provided with a refrigerant supply portion that discharges refrigerant toward the plurality of coils.

[0003] Specifically, the refrigerant distribution plate has a plate annular portion, a plurality of plate teeth protruding from the plate annular portion toward the inner diameter side, and a plurality of plate slots formed between adjacent plate teeth.

[0004] In the plate annular portion, a refrigerant supply portion that communicates the outer peripheral surface of the refrigerant distribution plate with each plate slot and extends in the radial direction is formed, and the outer diameter of the outer peripheral surface of the refrigerant distribution plate is smaller than the outer diameter of the outer peripheral surface of the stator core.

[0005] The plate annular portion is formed in substantially the same shape as the stator yoke of the stator core, the plate teeth are formed in substantially the same shape as the teeth of the stator core, and the plate slots are formed in substantially the same shape as the slots of the stator core.

[0006] Then, when the refrigerant distribution plate is assembled into the case by aligning the circumferential phases of the multiple plate teeth and the multiple teeth of the stator core and sandwiching it between a pair of stator core sections, an annular refrigerant introduction passage is formed between the inner circumferential surface of the case and the outer circumferential surface of the refrigerant distribution plate.

[0007] Therefore, when refrigerant is supplied to the refrigerant introduction passage, it flows circumferentially through the annular refrigerant introduction passage and is discharged to the left and right through multiple refrigerant supply sections of the refrigerant distribution plate into the slot passage, which is the gap between the slot and the coil. Furthermore, it flows axially through the slot passage, directly cooling the coil, and the coil within the slot can be cooled efficiently and uniformly without temperature unevenness along the entire axial direction. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2019-161752 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] However, the stator structure disclosed in Patent Document 1 has a problem in that the refrigerant distribution plate is formed in the same shape as the stator core, and a refrigerant supply section is provided for each plate slot of the refrigerant distribution plate, which necessitates the formation of a large number of holes for the refrigerant supply section, resulting in a complex structure.

[0010] This invention has been made in view of these circumstances, and one of its objectives is to provide a motor that can efficiently cool its stator with a simple structure. [Means for solving the problem]

[0011] To achieve the above objective, the present invention is understood by the following configuration. The motor of the present invention is a motor having a stator, The stator is, Stator core and The stator core includes a coil, The stator core is, Multiple teeth are provided in the circumferential direction, protruding radially inward and extending axially, The space between the multiple teeth formed in the circumferential direction includes a slot for arranging the coil wires of the coil that extend in the axial direction, A circumferential refrigerant flow path without teeth is provided in a part of the axial direction, The system includes a radial refrigerant flow path that opens to the outer surface of the stator core and connects from the outer surface of the stator core to the circumferential refrigerant flow path. [Effects of the Invention]

[0012] According to the present invention, a motor is provided that can efficiently cool the stator with a simple structure. [Brief explanation of the drawing]

[0013] [Figure 1] This is a cross-sectional view of a stator according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view along line AA in Figure 1. [Figure 3] This is a cross-sectional view along line BB in Figure 1. [Figure 4] This is a perspective view of the intermediate core portion of the first embodiment according to the present invention. [Figure 5] This is a cross-sectional view of the intermediate core portion of a second embodiment according to the present invention. [Figure 6] This is a cross-sectional view of a stator according to a third embodiment of the present invention. [Figure 7] Figure 6 is a cross-sectional view along the CC line. [Figure 8] This is a cross-sectional view of a stator according to a fourth embodiment of the present invention. [Figure 9] Figure 8 is a cross-sectional view along the DD line. [Modes for carrying out the invention]

[0014] Hereinafter, with reference to the accompanying drawings, embodiments for implementing the present invention (hereinafter referred to as "embodiments") will be described in detail. Throughout the description of the embodiments, the same elements are denoted by the same numbers or symbols. Also, the dimensional ratios in the drawings are different from the actual dimensional ratios and are merely drawn for easy understanding of the description, and do not guarantee that the same parts are drawn with the same dimensions between the drawings. Furthermore, for easy understanding of the configuration, schematic drawings are also included. In the drawings, for ease of viewing, only some of the parts having the same attribute and existing in plurality may be labeled with reference signs.

[0015] <<First Embodiment>> A motor having a stator 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

[0016] Note that the motor according to the present invention is not particularly limited in its intended use, but is suitable for use in applications where high cooling efficiency is required. Therefore, for example, the motor according to the present invention can be suitably used for a rotating electric machine used for driving an automobile.

[0017] FIG. 1 is a cross-sectional view of a stator 1 according to the first embodiment of the present invention and is a cross-sectional view along the rotation axis R of a rotor (not shown). FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, and the illustration of the stator sleeve 30 is omitted for easy understanding of the explanation. FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1, and the illustration of the teeth 11B of the outer core portion 11 on one side in the axial direction that is visible on the back side of the paper is omitted for easy understanding of the explanation. FIG. 4 is a perspective view of an intermediate core portion 12 according to the first embodiment of the present invention. Hereinafter, when viewed in a plane orthogonal to the rotation axis R of the rotor, the direction far from the rotation axis R of the rotor (not shown) is defined as the radially outer side, and conversely, the direction close to the rotation axis R is defined as the radially inner side.

[0018] Furthermore, when viewed in a plane perpendicular to the rotation axis R of the rotor (not shown), the circumferential direction is defined as the direction along the rotation axis R, with the rotor's rotation axis R as the center.

[0019] Furthermore, the direction of extension of the rotation axis R of the rotor (not shown) (left-right direction in Figure 1) is defined as the axial direction. Furthermore, if it is necessary to indicate a further direction relative to this axis, it will be described as "one side of the axis" and "the other side of the axis."

[0020] In the following, when referring to the left side of Figure 1, it will be described as one axial side, and when referring to the right side of Figure 1, it will be described as the other axial side. The distinction between one side and the other side is made by designating one axial direction as one side, and the other direction as the other side.

[0021] The motor of the first embodiment includes a stator 1 shown in Figure 1, a rotor (not shown) positioned radially inward of the stator 1 and having a rotor shaft (not shown) which serves as the axis of rotation R, and a case (not shown) that houses the rotor and the stator 1.

[0022] The rotor can be the same type used in a typical inner-rotor motor. Although not shown in the diagram, it comprises a shaft that serves as the axis of rotation R, a rotor core fixed to the shaft, and permanent magnets provided on the rotor core.

[0023] The rotor may also be a so-called wound-field type rotor, in which rotor coils are wound around a rotor core.

[0024] The axial ends of the shaft (not shown) are then rotatably fixed to the case (not shown) via, for example, ball bearings (not shown).

[0025] As shown in Figure 1, the stator 1 comprises a stator core 10, a coil 20 wound around the stator core 10, and a stator leaf 30 positioned inside the stator core 10.

[0026] [Stator Core 10] The stator core 10 comprises a pair of outer core portions 11 provided on the axial outer side, and an intermediate core portion 12 provided between the outer core portions 11.

[0027] (Outer core portion 11) As shown in Figures 1 and 2, the outer core portion 11 comprises a cylindrical back yoke 11A, multiple teeth 11B provided in the circumferential direction, which protrude radially inward from the inner circumferential surface of the back yoke 11A and extend in the axial direction, and, as shown in Figure 2, slots 11C which are spaces between the multiple teeth 11B formed in the circumferential direction and for arranging the coil wires of the coil 20 that extend in the axial direction.

[0028] Thus, the stator core 10 includes multiple teeth 11B provided circumferentially on the outer core portion 11, which protrude radially inward and extend axially, and slots 11C which are spaces between the multiple teeth 11B formed circumferentially and for arranging the coil wires of the coil 20 that extend axially.

[0029] In the first embodiment, a pair of outer core portions 11 have the same configuration, and the outer core portion 11 is formed by stacking plate-shaped electromagnetic steel sheets in the axial direction, each having an annular portion that becomes a back yoke 11A and a plurality of protruding portions that are provided in the circumferential direction and become teeth 11B that protrude from the inner circumferential surface of the annular portion. The outer core portion 11 may be formed by other methods, such as by machining it from a cylindrical ingot.

[0030] Furthermore, in the first embodiment, the outer core portion 11 on one axial side (for example, the left side in Figure 1) and the outer core portion 11 on the other axial side (for example, the right side in Figure 1) have the same axial length, but it is not necessary to be limited to having the same axial length in this way.

[0031] As shown in Figure 2, the slot 11C has an opening 11D on the radially inward side. The radially inner opening 11D of this slot 11C is formed by the separation of the radially inner tips of adjacent teeth 11B, and thus it is an axially extending slit. In other words, slot 11C has a slit that extends axially and opens radially inward 11D.

[0032] (Intermediate core section 12) As shown in Figures 3 and 4, the intermediate core portion 12 is a cylindrical member 12S having approximately the same inner and outer diameters as the back yoke 11A of the outer core portion 11. A through-hole is formed in a part of the circumferential direction of this cylindrical member 12S, which penetrates from the outer circumferential surface to the inner circumferential surface and opens to the outer surface, forming a radial refrigerant flow path 12A.

[0033] Since the intermediate core portion 12 has a different structure from the outer core portion 11, it is preferable that it be made of a non-magnetic material so as not to affect magnetic flux, etc. For example, aluminum or resin can be suitably used as the material.

[0034] Furthermore, since the intermediate core portion 12 does not have a structure corresponding to the teeth 11B of the outer core portion 11, as shown in Figure 1, when it is sandwiched between the pair of outer core portions 11, a part of the stator core 10 in the axial direction where the intermediate core portion 12 is located opens radially inward, forming a groove structure that constitutes a circumferential refrigerant flow path 12B (see Figure 3) without teeth 11B along the circumferential direction. In other words, the circumferential refrigerant flow path 12B has a groove structure that opens radially inward and has a circumferential opening 12B1 (see Figure 1) that runs along the circumferential direction.

[0035] Thus, the stator core 10 is provided in a part of its axial direction (the part of the intermediate core 12) and includes a circumferential refrigerant flow path 12B without teeth 11B, and a radial refrigerant flow path 12A that opens to the outer surface of the stator core 10 and connects from the outer surface of the stator core 10 to the circumferential refrigerant flow path 12B.

[0036] Furthermore, as described above, it is preferable that the portion of the stator core 10 corresponding to the circumferential refrigerant flow path 12B is formed of a non-magnetic material.

[0037] Furthermore, the groove structure constituting this circumferential refrigerant flow path 12B is formed by the end face of the outer core portion 11, which is located on one axial side and faces the other axial side, with the axial side of one side (the left side in Figure 1) being the supporting surface.

[0038] Similarly, in the groove structure constituting this circumferential refrigerant flow path 12B, the side surface on the other axial side (the left side in Figure 1) is supported by the axial end face of the outer core portion 11 located on the other axial side.

[0039] Therefore, the slots 11C of the outer core portion 11 are open on both axial sides of the groove structure that constitutes the circumferential refrigerant flow path 12B (one axial side of the groove structure and the other axial side of the groove structure).

[0040] Furthermore, since the intermediate core portion 12 is responsible for the radially outer surface of the groove structure that constitutes the circumferential refrigerant flow path 12B, the through-hole that becomes the radial refrigerant flow path 12A is connected from the outer surface of the stator core 10 to the circumferential refrigerant flow path 12B.

[0041] [Coil 20] Coil 20 is a coil to which current is supplied for the rotational drive of the motor.

[0042] For example, in the case of a stator 1 of a three-phase motor, the stator 1 is equipped with coils 20 corresponding to each phase (a coil 20 for the U phase, a coil 20 for the V phase, and a coil 20 for the W phase) which are wound around the stator core 10.

[0043] Furthermore, the coil 20 is not limited to a long coil wire wound around the stator core 10. It may also be provided wound around the stator core 10 by joining a pair of adjacent short coil wires at one coil end CN1 on the rotation axis side, and then joining one of the joined coil wires with another adjacent short coil wire as a pair at the coil end CN2 on the other rotation axis side.

[0044] As shown in Figure 2, the coils 20 corresponding to the U-phase, V-phase, and W-phase are connected to an inverter circuit that controls the supply of current via electrical connection parts EC (U-phase connection part EC1, V-phase connection part EC2, and W-phase connection part EC3). Note that the U-phase connection EC1, V-phase connection EC2, and W-phase connection EC3 are sometimes referred to as busbars.

[0045] Specifically, the U-phase coil 20 is connected to the inverter circuit via the U-phase connection part EC1, the V-phase coil 20 is connected to the inverter circuit via the V-phase connection part EC2, and the W-phase coil 20 is connected to the inverter circuit via the W-phase connection part EC3.

[0046] [Status Leave 30] The stator leaf 30 is a cylindrical member having an outer diameter that is held at the radially inward tips of the teeth 11B of a pair of outer core portions 11 located on one axial side and the other axial side, and an inner diameter that is rotatable radially inward to receive a rotor, and has an axial length that is approximately the same as that of the stator core 10.

[0047] Furthermore, since the status leaf 30 will come into contact with the teeth 11B of the outer core portion 11, as described above, it is preferable that it be made of a non-magnetic material, and for example, a resin material such as polyether ether ketone can be suitably used.

[0048] Although the status leaf 30 becomes free at the intermediate core section 12, this does not pose any particular problem because one axial side and the other axial side are held and fixed by the outer core section 11.

[0049] As described above, when the status leaf 30 is provided inside the stator core 10 so as to contact the teeth 11B of the stator core 10, the status leaf 30 closes the slit that opens 11D (see Figure 2) radially inward of the slot 11C, and the circumferential opening 12B1 (see Figure 1) that opens radially inward of the circumferential coolant flow path 12B. Therefore, the refrigerant can flow through the slot 11C without leaking radially inward from the circumferential opening 12B1 and the slit.

[0050] In the stator 1 of the first embodiment described above, when refrigerant is supplied to the radial refrigerant flow path 12A, that refrigerant is supplied to the circumferential refrigerant flow path 12B. As explained earlier, since there are no teeth 11B in the circumferential refrigerant flow path 12B, the refrigerant is efficiently distributed in the circumferential direction.

[0051] Furthermore, since a pair of slots 11C of the outer core portion 11 are open on one axial side and the other side of the circumferential refrigerant flow path 12B, the refrigerant in the circumferential refrigerant flow path 12B continues to flow through the slots 11C, efficiently cooling the coil wires in the slots 11C.

[0052] For example, if a flow path is provided for supplying refrigerant from the radially outer side for each slot, as in Patent Document 1, there is a possibility that the coil wire may block the inner opening of the flow path. In that case, not much refrigerant will be supplied to the slot whose inner opening is blocked.

[0053] Furthermore, even when the refrigerant is distributed throughout the entire slot in the radial direction, it flows through the gaps between the radial coil wires, making it easy for areas to remain unreachable.

[0054] On the other hand, with the stator 1 of the first embodiment, the refrigerant first flows through the circumferential refrigerant flow path 12B. Instead of flowing through the gaps in the slot 11C where there are no coil wires, the absence of teeth 11B allows the refrigerant to flow using spaces that would normally be blocked by the presence of teeth 11B. As a result, the refrigerant covers the entire circumference of the end face of the slot 11C that opens into the circumferential refrigerant flow path 12B, and the refrigerant flows into the slot 11C. Therefore, the refrigerant is supplied to the slot 11C evenly and efficiently, resulting in high cooling efficiency.

[0055] Moreover, the intermediate core section 12 used to form this circumferential refrigerant flow path 12B is an extremely simple structure, consisting only of a cylindrical structure with through-holes.

[0056] <<Second Embodiment>> Next, a motor having a stator 1 according to a second embodiment of the present invention will be described, mainly with reference to Figure 5.

[0057] In the second embodiment, the basic configuration is the same as in the first embodiment. Therefore, the following will mainly describe the differences from the first embodiment, and explanations of points that are the same as in the first embodiment may be omitted.

[0058] Specifically, the motor of the second embodiment differs from the motor of the first embodiment only in the shape of the intermediate core portion 12; therefore, the following description will mainly focus on the intermediate core portion 12.

[0059] Figure 5 is a cross-sectional view of the intermediate core portion 12 of the second embodiment according to the present invention, and is a cross-sectional view corresponding to Figure 3. In Figure 5, as with Figure 3, the teeth 11B of the outer core portion 11 on one axial side, which are visible towards the back of the page, are omitted from the illustration for clarity.

[0060] As shown in Figure 5, the intermediate core section 12 is provided with a plurality of partition wall sections 12C that divide the circumferential refrigerant flow path 12B in the circumferential direction, and a radial refrigerant flow path 12A is provided for each divided circumferential refrigerant flow path 12B.

[0061] In other words, the stator core 10 is provided with a plurality of partition walls 12C that divide the circumferential refrigerant flow path 12B in the circumferential direction, and a radial refrigerant flow path 12A is provided for each divided circumferential refrigerant flow path 12B.

[0062] For example, in the first embodiment, some refrigerant is supplied into the slot 11C at a position half a turn away from the radial refrigerant flow path 12A in the circumferential direction (lower side of Figure 1), and the longer the distance the refrigerant flows in the circumferential direction, the more its temperature rises due to the heat of the stator core 10 and coil 20. Therefore, variations in the refrigerant temperature tend to occur in the circumferential direction.

[0063] On the other hand, as in the second embodiment, if the circumferential refrigerant flow path 12B is divided in the circumferential direction and refrigerant is supplied from radial refrigerant flow paths 12A provided for each divided circumferential refrigerant flow path 12B, the flow of refrigerant over long distances in the circumferential direction can be suppressed, thereby suppressing temperature variations of the refrigerant in the circumferential direction and facilitating uniform cooling.

[0064] In the second embodiment, the case was shown where three partition walls 12C are provided at equal intervals (120° intervals) in the circumferential direction. However, the number of partition walls 12C is not limited to three; it may be two, four or more, or any number of partition walls 12C.

[0065] Furthermore, in this second embodiment as well, there is no need to provide small-diameter through holes toward structures similar to teeth or slots between such structures, as in Patent Document 1, resulting in an extremely simple design.

[0066] Furthermore, as shown in Figure 5, the partition wall portion 12C also abuts against the status leaf 30 and has the effect of holding the status leaf 30, making it possible to hold the status leaf 30 more stably than in the first embodiment.

[0067] <<Third Embodiment>> Next, a motor having a stator 1 according to a third embodiment of the present invention will be described, mainly with reference to Figures 6 and 7.

[0068] In the third embodiment, the basic configuration is the same as in the first embodiment. Therefore, the following will mainly describe the differences from the first embodiment, and explanations of points that are the same as in the first embodiment may be omitted.

[0069] Specifically, the motor of the third embodiment differs from the motor of the first embodiment only in the shape of the intermediate core portion 12; therefore, the following description will mainly focus on the intermediate core portion 12.

[0070] Figure 6 is a cross-sectional view of the stator 1 of the third embodiment according to the present invention, and corresponds to Figure 1. In other words, Figure 6 is a cross-sectional view along the rotation axis R of the rotor (not shown).

[0071] Figure 7 is a cross-sectional view of the CC line in Figure 6, and corresponds to Figure 3. In Figure 7, as with Figure 3, the teeth 11B of the outer core portion 11 on one axial side, which are visible towards the back of the page, are omitted from the illustration for clarity.

[0072] As shown in Figures 6 and 7, the intermediate core portion 12 of the third embodiment includes a cylindrical inner ring portion 12D that is spaced apart radially inward of the cylindrical member 12S and supports the status leaf 30, and a bridging portion 12E that connects the cylindrical member 12S and the cylindrical inner ring portion 12D.

[0073] In other words, the stator core 10 is positioned in the axial direction corresponding to the circumferential refrigerant flow path 12B and is equipped with a cylindrical support portion (inner ring portion 12D) that supports the stator leaf 30.

[0074] The inner ring portion 12D has an inner circumferential surface on its radially inner side, as shown in Figure 6, located at approximately the same position as the radially inner tip of the teeth 11B of the outer core portion 11, and holds the status leaf 30 in the same way as the radially inner tips of the teeth 11B of the pair of outer core portions 11.

[0075] In the third embodiment, as shown in Figure 6, the axial width of the inner ring portion 12D is approximately the same as the axial width of the circumferential opening 12B1 of the circumferential refrigerant flow path 12B described in the first embodiment (Figures 1 and 3). However, the axial width of the inner ring portion 12D may be narrower than the axial width of the circumferential opening 12B1 of the circumferential refrigerant flow path 12B.

[0076] In the stator 1 of the third embodiment described above, despite its simple structure, it is possible to hold the status leaf 30 more stably than in the first embodiment.

[0077] <<Fourth Embodiment>> Next, a motor having a stator 1 according to the fourth embodiment of the present invention will be described, mainly with reference to Figures 8 and 9.

[0078] In the fourth embodiment, the basic configuration is the same as in the third embodiment. Therefore, the following will mainly describe the differences from the first embodiment, and explanations of aspects that are the same as in the third embodiment may be omitted.

[0079] Specifically, the motor of the fourth embodiment differs from the third embodiment mainly in that it does not have a stator leaf 30. Accordingly, the stator 1 has a configuration that closes a slit 11D that extends axially in the slot 11C of the stator core 10 and opens radially inward. The following will mainly explain this point.

[0080] Figure 8 is a cross-sectional view of the stator 1 of the fourth embodiment according to the present invention, and corresponds to Figure 6. In other words, Figure 8 is a cross-sectional view along the rotation axis R of the rotor (not shown). Figure 9 is a cross-sectional view of line DD in Figure 8, and corresponds to Figure 2.

[0081] As shown in Figures 8 and 9, the stator 1 of the fourth embodiment does not have a stator leaf 30, and as shown in Figure 8, the inner ring portion 12D of the intermediate core portion 12 described in the third embodiment functions as a radially inner wall portion that closes the circumferential opening 12B1 of the circumferential refrigerant flow path 12B described in the first embodiment.

[0082] In other words, the stator core 10 is provided radially inward at an axial position corresponding to the circumferential refrigerant flow path 12B, and includes an inner wall portion (inner ring portion 12D) of the circumferential refrigerant flow path 12B that extends in the circumferential direction.

[0083] On the other hand, as shown in Figure 9, the stator 1 is located within the slot 11C (within the slot 11C of the outer core portion 11), extends axially along the slot 11C, and is provided on the slit side that opens radially inward to form a slit 11D, and includes a closing portion 40 that closes the slit.

[0084] Note that Figure 9 shows the outer core portion 11 on one axial side, but the same applies to the outer core portion 11 on the other axial side.

[0085] Thus, the stator 1 of the fourth embodiment is equipped with a closing portion 40 that extends axially through the slot 11C and closes the slit 11D that opens radially inward, so that the refrigerant can flow efficiently through the slot 11C axially outward.

[0086] Furthermore, in the fourth embodiment, as in the third embodiment, the intermediate core portion 12 can be realized with a simple structure.

[0087] Furthermore, since the blocking portion 40 is in contact with adjacent teeth 11B, it is preferable that it be made of a non-magnetic material so as not to affect magnetic flux, etc. For example, insulating resin can be suitably used as the material.

[0088] Although the present invention has been described above based on specific embodiments, the present invention is not limited to the above embodiments.

[0089] For example, in the fourth embodiment, instead of the closing portion 40, a status leaf 30 on one axial side corresponding to the outer core portion 11 on one axial side and a status leaf 30 on the other axial side corresponding to the outer core portion 11 on the other axial side may be used.

[0090] Thus, the present invention includes modifications and improvements to its embodiments, which is evident to those skilled in the art from the claims. [Explanation of Symbols]

[0091] 1... Stator, 10... Stator core, 11B... Teeth, 11C... Slot, 12A... Radial refrigerant flow path, 12B... Circumferential refrigerant flow path, 12B1... Circumferential opening, 12C... Isolation wall, 20... Coil, 30... Stator leaf

Claims

1. A motor having a stator, The stator is, Stator core and The stator core includes a coil, The stator core is, Multiple teeth are provided in the circumferential direction, protruding radially inward and extending axially, The space between the multiple teeth formed in the circumferential direction includes a slot for arranging the coil wires of the coil that extend in the axial direction, A circumferential refrigerant flow path without teeth is provided in a part of the axial direction, A motor comprising a radial refrigerant flow path that opens to the outer surface of the stator core and connects from the outer surface of the stator core to the circumferential refrigerant flow path.

2. The aforementioned slot has a slit that extends in the axial direction and opens radially inward, The aforementioned circumferential refrigerant flow path has an opening radially inward and a circumferential opening along the circumferential direction, The motor according to claim 1, wherein the stator is disposed inside the stator core and comprises a stator leaf that closes the slit and the circumferential opening.

3. The stator core includes a plurality of partition walls that divide the circumferential refrigerant flow path in the circumferential direction, The motor according to claim 2, wherein the radial refrigerant flow path is provided for each of the divided circumferential refrigerant flow paths.

4. The motor according to any one of claims 1 to 3, wherein the stator core is formed of a non-magnetic material in the portion corresponding to the circumferential refrigerant flow path.

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