Stator and motor unit having the same

Abstract

A stator capable of efficiently cooling a coil and a motor unit including the stator are provided. [Solution] The motor comprises a cylindrical stator core 2, a ring-shaped oil guide 3A (guide member) arranged coaxially with the stator core 2 on at least one axial end side of the stator core 2, and a coil attached to the stator core 2 and the oil guide 3A so that multiple coil ends protrude axially from the oil guide 3A, and the oil guide 3A is provided with an introduction section 33A through which a refrigerant supplied from the outside is introduced, and multiple ejection sections 34 connected to the introduction section 33A and configured to eject refrigerant toward the multiple coil ends.

Description

[Technical field]

[0001] The present invention relates to a stator for a motor and a motor unit including the stator. [Background technology]

[0002] With the recent spread of electric vehicles, there is a demand for smaller motors from the standpoint of mounting motors on electric vehicles, model development, production, cost reduction, etc. In order to reduce the size of a motor without reducing the motor's output, it is necessary to increase the motor's output density, and more specifically, the current density of the current flowing through the coil. However, increasing the current density increases the amount of heat generated by the coil, so technology for cooling the coil (see, for example, Patent Document 1) is essential. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent Publication No. 11462958 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, the coolant supplied from the outside passes through the inside of the stator core before being sprayed toward the coil ends. As a result, the coolant absorbs heat from the stator core and reaches the coil ends in a heated state. This conventional technology leaves room for improvement in terms of efficiently cooling the coils.

[0005] The present invention has been made in view of the above, and has an object to provide a stator capable of efficiently cooling a coil, and a motor unit including the same. [Means for solving the problem]

[0006] In order to achieve the above object, the stator according to the present invention is configured as follows. The stator according to the present invention includes a cylindrical stator core, a ring-shaped guide member arranged coaxially with the stator core on at least one axial end side of the stator core, and coils attached to the stator core and the guide member such that a plurality of coil ends protrude from the guide member in the axial direction. The guide member is provided with an introduction portion through which a refrigerant supplied from the outside is introduced, and a plurality of ejection portions that are connected to the introduction portion and configured to eject the refrigerant toward the plurality of coil ends.

[0007] According to the above configuration, the coil is attached to the stator core and the guide member such that the coil ends protrude from the guide member in the axial direction, and the guide member is disposed adjacent to the coil ends of the coil. Furthermore, the guide member disposed as described above is provided with an introduction section into which the refrigerant supplied from the outside is introduced, and a plurality of ejection sections that are connected to the introduction section and configured to eject the refrigerant toward the coil ends, so that the refrigerant supplied from the outside is introduced into the introduction section and then ejected directly from the ejection section toward the adjacent coil ends. Therefore, the refrigerant supplied from the outside is applied to the coil ends in a fresh state that has not yet removed heat from other components of the stator. This has the effect of efficiently cooling the coil.

[0008] As an additional effect, by making the guide member separate from the stator core, the guide member can be provided on the stator without affecting the strength and productivity of the stator core.

[0009] In the above stator, some of the coil ends may be formed to have an inclined portion that extends obliquely in a direction intersecting the axial direction as it moves axially outward, and some of the ejection portions may be configured to eject the coolant toward an inner portion of the inclined portion that faces the guide member. With this configuration, the coolant is ejected toward the inner portion of the inclined portion of the coil end that faces the guide member, i.e., the portion close to the guide member. This ensures that the coolant is applied to the coil ends.

[0010] In the above stator, some of the plurality of ejection parts may be configured to eject the refrigerant radially inward from a radially outer side of the plurality of coil ends. With this configuration, the refrigerant is ejected radially inward toward the coil ends located radially inside the ejection parts. In particular, the refrigerant is ejected upward against gravity toward the coil ends located on the 6 o'clock side (lower side) of the guide member in the clockwise direction, i.e., the coil ends located above the ejection parts. This ensures that the refrigerant is applied to the coil ends located radially inside the ejection parts.

[0011] In the above stator, the stator core may be formed with a plurality of first slots that penetrate the stator core in the axial direction and are aligned in the circumferential direction, the guide member may be formed with a plurality of second slots that penetrate the stator core in the axial direction so as to correspond to the plurality of first slots, the coil ends may protrude in the axial direction from the second slots by inserting the coil into the plurality of first slots and the plurality of second slots, and some of the plurality of ejection portions may be disposed between adjacent ones of the second slots. With this configuration, regardless of the radial position of the coil ends of the coils that are inserted into the plurality of first slots and the plurality of second slots, the ejection portions may be disposed near the coil ends, and the refrigerant may be ejected from near the coil ends. This allows the refrigerant to be reliably applied to the coil ends.

[0012] In the above stator, the plurality of jetting portions may be configured to jet the coolant toward different coil ends, so that the coolant can be applied to each of the coil ends, thereby more efficiently cooling the entire coil.

[0013] In the above stator, the stator core may be formed with an in-core flow passage penetrating in the axial direction, and the guide member may be provided with a core connection portion that communicates with the introduction portion and is connected to an inlet of the in-core flow passage. With this configuration, a part of the refrigerant supplied from the outside is introduced at the introduction portion and then flows from the core connection portion into the in-core flow passage. This allows the stator core to be cooled.

[0014] In the above stator, the guide members are disposed on both axial ends of the stator core, and the two guide members are in communication with each other via the in-core flow passage so that the refrigerant flows from one guide member to the other guide member through the in-core flow passage, and the other guide member may be provided with a plurality of sub-ejection portions configured to eject the refrigerant flowing from the one guide member toward the coil end on the other side. According to this configuration, the refrigerant that has passed through the in-core flow passage in the stator core from one guide member is ejected from the sub-ejection portions of the other guide member toward the coil end on the other side. This makes it possible to cool the coil end on the other side without waste of the refrigerant that has been used to cool the stator core.

[0015] In the above stator, the stator core may be formed with a plurality of first slots penetrating in the axial direction, the other guide member may be formed with a plurality of second slots respectively corresponding to the plurality of first slots, the coil may be inserted into the plurality of first slots and the plurality of second slots, each of the sub-ejection portions may be disposed radially outward of each of the second slots in the other guide member, and an opening portion opening to the second slot side may be provided in the flow path continuing to the sub-ejection portion. According to this configuration, the coil inserted into the second slot faces the flow path through the opening portion, so that the contact area between the coil and the refrigerant is increased. This allows the coil to be cooled more efficiently.

[0016] In the above stator, the guide member may be formed with a chamber including a concentric annular portion, and the ejection portion may be in communication with the introduction portion via the chamber. With this configuration, it is possible to eject the coolant in the chamber from the ejection portion in a state in which the annular portion is filled evenly in the circumferential direction with the coolant introduced through the introduction portion. This allows the coolant to be ejected evenly in the circumferential direction from the ejection portion, and therefore the coolant can be applied evenly in the circumferential direction to each of the coil ends.

[0017] In the above stator, the guide member may be provided with a peripheral wall portion that continuously surrounds the annular portion from the radially outer side. With this configuration, the peripheral wall portion occupies the space radially outward from the annular portion, thereby reducing the flow path volume within the guide member. This makes it possible to prevent air from being trapped within the guide member, and therefore to prevent a decrease in the ejection pressure of the refrigerant from the guide member.

[0018] In the above stator, the chamber may include a plurality of branch portions branching radially inward from the annular portion, and the ends of the branch portions may be connected to the ejection portion. With this configuration, when the chamber includes the branch portions, there is no space on the end side of the branch portions connected to the ejection portions. This makes it possible to prevent air from being trapped at the ends of the branch portions, and therefore to prevent a decrease in the ejection pressure of the refrigerant from the guide member.

[0019] In the above stator, the guide member may be made of a non-magnetic material, which allows the guide member to be provided on the stator without exerting a magnetic effect on the motor.

[0020] In the above stator, the guide member may be made of a resin material, which improves the degree of freedom in processing the guide member and therefore allows the ejection portion to be freely positioned according to the position of the coil end.

[0021] The above stator may further include a cylindrical sub-guide member arranged coaxially with the guide member and axially outward of the guide member, the introduction portion of the guide member opening radially outward, and a guide groove portion provided on an outer periphery of the sub-guide member for receiving the refrigerant supplied from the outside and guiding the refrigerant to the introduction portion. According to this configuration, the refrigerant supplied from the outside is guided to the introduction portion of the guide member along the guide groove portion on the outer periphery of the sub-guide member. This makes it possible to guide the refrigerant supplied from the outside to the introduction portion without expanding the size of the stator radially outward beyond the guide member, and therefore makes it possible to introduce the refrigerant into the introduction portion with a simple and space-saving structure.

[0022] The motor unit according to the present invention includes a motor including a stator and a housing that accommodates the stator, and the housing is configured to press the guide member of the stator against the stator core in the axial direction. With this configuration, leakage of refrigerant from between the stator core and the guide member is suppressed without providing a sealing member such as an O-ring between the stator core and the guide member. This allows the number of parts of the motor unit to be reduced, and therefore the cost of the motor unit to be reduced. Effect of the Invention

[0023] As described above, according to the present invention, the coil can be cooled efficiently. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic vertical cross-sectional view showing a portion of a motor unit in a first embodiment. [Diagram 2] FIG. 2 is a perspective view of a stator according to the first embodiment. [Diagram 3] FIG. 3 is an exploded perspective view of the stator of FIG. 2. [Figure 4] FIG. 4 is an enlarged view of a coil end. [Diagram 5] 2 is a schematic front view showing a part of the oil guide in the first embodiment. FIG. [Figure 6] 6 is a schematic perspective view of a part of the oil guide in FIG. 5, as viewed from the axial inner side. [Figure 7] FIG. 11 is a diagram for explaining a first flow pattern. [Figure 8] FIG. 4 is a diagram for explaining the flow of oil in the oil guide in a first flow pattern. [Figure 9] FIG. 11 is a diagram for explaining a second flow pattern. [Figure 10] FIG. 10 is a diagram for explaining the flow of oil in the front oil guide in the second flow pattern. [Figure 11]FIG. 10 is a diagram for explaining the flow of oil in the rear oil guide in the second flow pattern. [Figure 12] FIG. 11 is a diagram for explaining a third flow pattern. [Figure 13] FIG. 10 is a diagram for explaining the flow of oil in the front oil guide in the third flow pattern. [Figure 14] 13 is a diagram for explaining the flow of oil in the rear oil guide in the third flow pattern. FIG. [Figure 15] 11A and 11B are diagrams for explaining the jetting manner of a jetting part and a sub-jetting part. [Figure 16] 4 is an enlarged view showing a radially outer ejection portion and a coil end which is an ejection target thereof; FIG. [Figure 17] 4 is an enlarged view showing a radially inner blowing portion and a coil end which is a blowing target thereof. FIG. [Figure 18] 4 is an enlarged view showing a sub-ejection portion and a coil end which is an ejection target thereof; FIG. [Figure 19] 4 is a schematic vertical cross-sectional view showing a coil end arranged below the oil guide and its surrounding area. FIG. [Figure 20] FIG. 11 is a schematic front view showing an oil guide in a second embodiment. [Figure 21] FIG. 21 is an enlarged view of the upper side of the oil guide in FIG. 20. [Figure 22] 11 is a schematic vertical cross-sectional view showing a flow path continuing to a sub-jet portion in the second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. (Embodiment 1) (Motor unit configuration) Fig. 1 is a schematic vertical cross-sectional view showing a part of a motor unit A in embodiment 1. Although Fig. 1 shows one axial end side of the motor unit A, the other axial end side also appears in the same manner. First, the configuration of the motor unit A in embodiment 1 of the present invention will be described. As shown in Fig. 1, the motor unit A includes a motor 1 and a housing 9.

[0026] The motor 1 is, for example, an interior permanent magnet motor (IPM motor) and is used as a drive source for an electric vehicle. The motor 1 includes a shaft 10 which is a rotating shaft, a cylindrical rotor 11 to which the shaft 10 is fixed in a central hole, and a cylindrical stator 12 which is disposed radially apart from the rotor 11 so that its inner peripheral surface faces the outer peripheral surface of the rotor 11. The shaft 10 is configured to be integral with the rotor 11 and to be rotatable relative to the stator 12. The shaft 10, the rotor 11, and the stator 12 are arranged concentrically, and in the drawing, the axial directions of these are uniformly indicated by the symbol δ. The configuration of the stator 12 will be described in detail later.

[0027] Oil is supplied as a coolant to the motor 1. More specifically, oil stored in an oil pan (not shown) is cooled by a heat exchanger (not shown) and then pumped to the motor 1 by an oil pump OP. The thick dashed arrows in FIG. 1 conceptually show the flow of oil, and the same applies to the thick and dashed arrows in the following figures. After being used to cool the motor 1, the oil is stored again in the oil pan.

[0028] The housing 9 houses the rotor 11 and the stator 12 while exposing both ends of the shaft 10. A flow path 90 is formed inside the housing 9 for allowing oil supplied from the outside to flow to the motor 1. Although not shown, the housing 9 may be formed with other flow paths for oil, for example, flow paths for allowing the oil to flow to other members (such as bearings). The configuration of the housing 9 will be described in detail later.

[0029] (Stator configuration) FIG. 2 is a perspective view of the stator 12 in the first embodiment. Next, the configuration of the stator 12 in the first embodiment of the present invention will be described in detail. As shown in FIG. 2, the stator 12 includes a stator core 2, an oil guide 3A (guide member), a coil 4 having a plurality of coil ends 40 at an axial end, and a sub-oil guide 5 (sub-guide member). The stator 12 is configured so that a current flows from a power source (not shown) through an input terminal B to the coil 4, and the coil 4 is the main heat source of the stator 12. For this reason, the stator 12 is configured to eject oil flowing from a flow path 90 in the housing 9 toward the coil end 40 of the coil 4 using the oil guide 3A, mainly to cool the coil 4. Below, first, each part of the stator 12 will be briefly described, and then the detailed configuration of the oil guide 3A will be described together with the oil flow pattern.

[0030] <Stator parts> FIG. 3 is an exploded perspective view of the stator 12 of FIG. 2. Note that, in FIG. 3, the coil 4 is omitted for convenience of illustration. As shown in FIG. 3, the stator core 2 is cylindrical and made of a magnetic material such as electromagnetic steel. The stator core 2 is formed with a plurality of first teeth 21 that extend circumferentially inward and are aligned in the circumferential direction over the entire axial length of the stator core 2. The spaces between the adjacent first teeth 21 form first slots 20. Thus, the stator core 2 is formed with a plurality of first slots 20 that penetrate the stator core 2 in the axial direction and are aligned in the circumferential direction. Each of the first slots 20 extends radially outward from an inner periphery 2s of the stator core 2 so as to open radially inward.

[0031] 3, in addition to the above, a plurality of in-core flow passages 22 are formed in the stator core 2, penetrating in the axial direction radially outside each of the first slots 20. A cross section of each in-core flow passage 22 perpendicular to the axial direction is substantially rectangular, and its circumferential width is set to correspond to the circumferential width of each of the first slots 20.

[0032] The in-core flow passage 22 includes an in-core flow passage 22F in which oil flows axially forward and an in-core flow passage 22R in which oil flows axially rearward, and the in-core flow passages 22F, 22R are arranged alternately in pairs in the circumferential direction. For ease of explanation, matters common to the in-core flow passages 22F, 22R may be described below using the common reference numeral 22. The flow pattern of oil passing through the in-core flow passage 22 will be described later together with the flow pattern of oil passing through the oil guide 3A.

[0033] 2 and 3, the oil guide 3A is disposed on both axial ends of the stator core 2, and includes an oil guide 3F disposed on the front side, which is one axial end side of the stator core 2, and an oil guide 3R disposed on the rear side, which is the other axial end side of the stator core 2. Both oil guides 3F, 3R are ring-shaped with approximately the same outer diameter and inner diameter as the stator core 2, and are disposed coaxially with the stator core 2. Both oil guides 3F, 3R communicate with each other via the in-core flow passage 22 so that oil passes through the in-core flow passage 22 in the stator core 2 and flows from one oil guide to the other oil guide.

[0034] The oil guides 3F, 3R are arranged to face in opposite directions and are formed in the same shape. Therefore, for the sake of convenience, the following description may use the common reference numeral 3A to describe matters common to the oil guides 3F, 3R.

[0035] The oil guide 3A is made of a non-magnetic material, more specifically, a resin material (e.g., SPS: syndiotactic polystyrene, PPS: polyphenylene sulfide). As shown in FIG. 3, the oil guide 3A has a plurality of second teeth 31 extending circumferentially inward to correspond to the plurality of first teeth 21 of the stator core 2 and arranged in the circumferential direction over the entire axial length of the oil guide 3A. The space between the adjacent second teeth 31 forms a second slot 30. Thus, the oil guide 3A has a plurality of second slots 30 penetrating the oil guide 3A in the axial direction to correspond to the plurality of first slots 20. Each second slot 30 extends radially outward from an inner periphery 3s of the oil guide 3A so as to open radially inward.

[0036] Returning to Fig. 2, the coil 4 is a so-called SC (segment conductor) winding consisting of multiple segment coils connected to each other. Although not shown, the coil 4 is made up of multiple coil groups (three for three phases in this embodiment) through which currents of different phases flow, and the outer surface of each coil 4 is coated with an insulating coating.

[0037] 4 is an enlarged view of the coil end 40. As shown in FIG. 2, the coil 4 is attached to the stator core 2 and the oil guide 3A such that the coil ends 40 protrude from the oil guide 3A in the axial direction. More specifically, the coil 4 is inserted into the first slots 20 in the stator core 2 and the second slots 30 in the oil guide 3A. Therefore, as shown in FIG. 4, the coil ends 40 protrude from the second slots 30 in the axial direction. As a result of the coil 4 being attached to the stator core 2 and the oil guide 3A in this manner, the oil guide 3A is disposed adjacent to the coil ends 40 of the coil 4.

[0038] The arrangement and shape of each coil end 40 depend on the orientation (extension) of the coil 4. As an example, a description will be given using some of the coil ends 40 (coil ends 40a, 40b, 40c) shown in Fig. 4. Note that while Fig. 4 shows coil ends 40a, 40b, 40c arranged on the upper side, these coil ends 40a, 40b, 40c are repeatedly arranged around the entire circumference.

[0039] As shown in FIG. 4, the coil ends 40a, 40b, and 40c are arranged so as to overlap in this order from the outside to the inside in the radial direction. The coil end 40b and the coil end 40c overlapping with it in the radial direction are both formed to have an inclined portion 41 that extends obliquely in a direction intersecting the axial direction as it goes axially outward in accordance with the orientation direction of the coil 4. An inner portion 42 in the axial direction of the inclined portion 41 faces the oil guide 3A side. The coil end 40a is also formed to have a stepped portion 43 that is one step higher on the radially outer side in order to avoid interference with the coil end 40b overlapping with it in the radial direction. In this way, the coil ends 40 have various arrangements and shapes so as not to interfere with each other while conforming to the orientation direction of the coil 4.

[0040] 2 and 3, the sub-oil guide 5 is disposed axially outboard of the oil guide 3A and includes a sub-oil guide 5F disposed forward of the oil guide 3F and a sub-oil guide 5R disposed rearward of the oil guide 3R. The sub-oil guides 5F and 5R are both cylindrical and disposed coaxially with the oil guides 3F and 3R.

[0041] The sub-oil guides 5F, 5R are arranged to face in opposite directions and are formed to have the same shape. Therefore, for the sake of convenience, the following description may use the common reference numeral 5 to describe matters common to the sub-oil guides 5F, 5R.

[0042] The sub-oil guide 5 is made of a non-magnetic material, more specifically, a resin material (for example, syndiotactic polystyrene (SPS) or polyphenylene sulfide (PPS). The outer circumferential portion 5p of the sub-oil guide 5 is provided with a guide groove portion 50 for receiving oil supplied from the outside and for guiding the oil to the oil guide 3A, and a notch portion 51 for discharging the oil used for cooling the coil end 40 from the stator 12.

[0043] 3, the guide groove portion 50 includes an annular groove 500 whose axially inner end is stepped down radially inward toward the oil guide 3A, and a straight groove 501 extending axially outward from an upper portion of the annular groove 500. The oil flowing from the flow passage 90 in the housing 9 in FIG. 1 drips into the straight groove 501, then flows from the annular groove 500 into the oil guide 3A (specifically, the introduction portion 33A, which will be described later in detail), where it is used to cool the coil 4, and is then discharged from the inner periphery of the sub-oil guide 5 through the cutout portion 51.

[0044] <Oil guide configuration> Fig. 5 is a schematic front view showing a portion of the oil guide 3A in embodiment 1. Fig. 6 is a schematic perspective view showing a portion of the oil guide 3A in Fig. 5 as viewed from the axial inside. Next, a detailed configuration of the oil guide 3A will be described together with the flow pattern of oil passing through the oil guide 3A.

[0045] As shown in FIG. 5 and FIG. 6, the oil guide 3A includes a chamber 32A as an internal space, an introduction section 33A into which oil supplied from the outside is introduced, a plurality of ejection sections 34, a plurality of first connection sections 35 (core connection sections), a plurality of second connection sections 36, and a plurality of sub-ejection sections 37. Each ejection section 34 is connected to the introduction section 33A via the chamber 32A and configured to eject oil toward the coil end 40. Each first connection section 35 is connected to the introduction section 33A via the chamber 32A and is connected to the inlet of the in-core flow path 22 in the stator core 2, while each second connection section 36 is connected to the outlet of the in-core flow path 22. Each sub-ejection section 37 is connected to the second connection section 36 and configured to eject oil flowing from another oil guide 3A toward the coil end 40. The oil flow patterns passing through the oil guide 3A provided with these sections are classified into the following three types.

[0046] -Oil flow pattern- FIG. 7 is a diagram for explaining the first flow pattern. Note that in FIG. 7, the coil 4 is omitted for convenience of illustration. FIG. 8 is a diagram for explaining the flow of oil in the oil guide 3A in the first flow pattern. As shown in FIG. 7, the first flow pattern is a pattern in which oil flows in the same oil guide 3A, and as shown in FIG. 8, oil supplied from the outside is introduced into the introduction portion 33A in the oil guide 3A, passes through the chamber 32A, and is ejected from the ejection portion 34 in the same oil guide 3A toward the adjacent coil end 40. Note that, although FIG. 7 and FIG. 8 show the flow of oil in the front oil guide 3F, the flow of oil in the rear oil guide 3R is similar except that the direction of the oil ejected from the ejection portion 34 is opposite to the direction shown in FIG. 7 (toward the front side of the paper).

[0047] In such a first flow pattern, oil supplied from the outside is introduced by introduction portion 33A and ejection portion 34 of oil guide 3A, and then ejected directly from ejection portion 34 toward adjacent coil end 40. Therefore, the oil supplied from the outside falls on coil end 40 in a fresh state, without having absorbed heat from other components of stator 12 (for example, stator core 2). This allows coil 4 to be cooled efficiently.

[0048] FIG. 9 is a diagram for explaining the second flow pattern. For convenience of illustration, the coil 4 is omitted in FIG. 9, and the first connecting portion 35 and the second connecting portion 36 do not appear. FIG. 10 is a diagram for explaining the flow of oil in the front oil guide 3F in the second flow pattern. FIG. 11 is a diagram for explaining the flow of oil in the rear oil guide 3R in the second flow pattern. As shown in FIG. 9, the second flow pattern is a pattern in which oil flows from the front oil guide 3F to the rear oil guide 3R. More specifically, in the second flow pattern, oil supplied from the outside is introduced at the introduction portion 33A in the front oil guide 3F as shown in Figures 9 and 10, then passes through the chamber 32A and the first connection portion 35 in the oil guide 3F as shown in Figure 10, passes through the intra-core flow path 22R in the stator core 2 as shown in Figure 9, and then passes through the second connection portion 36 in the rear oil guide 3R as shown in Figures 9 and 11, and is sprayed from the sub-spray portion 37 in the oil guide 3R toward the rear coil end 40.

[0049] In such a second flow pattern, a part of the oil supplied from the outside is introduced into the introduction portion 33A of the oil guide 3F by the first connection portion 35 of the front oil guide 3F, and then flows from the first connection portion 35 into the in-core flow path 22R of the stator core 2. This makes it possible to cool the stator core 2.

[0050] Furthermore, in the second flow pattern, the oil that has passed from the oil guide 3F through the in-core flow passage 22R in the stator core 2 is sprayed from the sub-spray portion 37 in the rear oil guide 3R toward the rear coil end 40. This makes it possible to cool the rear coil end 40 without wasting the oil that has been used to cool the stator core 2.

[0051] FIG. 12 is a diagram for explaining the third flow pattern. For convenience of illustration, the coil 4 is omitted in FIG. 12, and the first connecting portion 35 and the second connecting portion 36 do not appear. FIG. 13 is a diagram for explaining the flow of oil in the front oil guide 3F in the third flow pattern. FIG. 14 is a diagram for explaining the flow of oil in the rear oil guide 3R in the third flow pattern. As shown in FIG. 12, the third flow pattern is a pattern in which oil flows from the rear oil guide 3R to the front oil guide 3F, opposite to the second flow pattern described above. More specifically, in the third flow pattern, oil supplied from the outside is introduced at the introduction portion 33A in the rear oil guide 3R as shown in Figures 12 and 14, then passes through the chamber 32A and the first connection portion 35 in the oil guide 3R as shown in Figure 14, passes through the intra-core flow path 22F in the stator core 2 as shown in Figure 12, and then passes through the second connection portion 36 in the front oil guide 3F as shown in Figures 12 and 13, and is sprayed from the sub-spray portion 37 in the oil guide 3F toward the front coil end 40.

[0052] In this third flow pattern, as in the above-described second flow pattern, a portion of the oil supplied from the outside flows from the first connection portion 35 in the oil guide 3R into the in-core flow path 22F in the stator core 2, thereby cooling the stator core 2. Furthermore, the oil that has passed through the in-core flow path 22F is sprayed from the sub-spray portion 37 in the oil guide 3F toward the front coil end 40, thereby making it possible to cool the front coil end 40 without waste of the oil that has been used to cool the stator core 2.

[0053] The individual parts of the oil guide 3A that realizes the above-mentioned flow pattern are configured in detail as follows.

[0054] -Details of each part of the oil guide- Returning to FIG. 5, the chamber 32A includes a concentric annular portion 320 arranged so as to surround the second slot 30 from the radial outside, and a plurality of branch portions 321 branching radially inward from the annular portion 320 toward the inside of the second tooth 31. Each branch portion 321 is connected to the ejection portion 34, and therefore the chamber 32A is connected to the ejection portion 34 at the branch portion 321. A plurality of spacers 322 having an axial thickness are provided in the annular portion 320 at intervals in the circumferential direction. This makes it possible to suppress compression of the chamber 32A in the axial direction, i.e., deformation of the oil guide 3A in the axial direction.

[0055] Furthermore, as described above, because the ejection part 34 communicates with the introduction part 33A via the chamber 32A including the annular part 320, it is possible to eject the oil in the chamber 32A from the ejection part 34 in a state in which the annular part 320 is filled evenly in the circumferential direction with the oil introduced at the introduction part 33A. This allows the oil to be ejected evenly in the circumferential direction from the ejection part 34, and therefore the oil can be applied evenly in the circumferential direction to each of the coil ends 40.

[0056] 3, the introduction portion 33A opens radially outward over the entire circumference of the outer circumferential portion 3p of the oil guide 3A, thereby allowing oil to be introduced into the oil guide 3A from the entire circumference of the outer circumferential portion 3p of the oil guide 3A.

[0057] As shown in Figures 4 and 5, the ejection parts 34 are circular holes that open axially outward and are provided on the axially outer side of the oil guide 3A. The ejection parts 34 are arranged at intervals from one another in the circumferential direction. As shown in Figure 4, the ejection parts 34 are arranged in the vicinity of the coil ends 40. This allows the oil to be sprayed reliably onto the coil ends 40.

[0058] 5, the ejection portion 34 is disposed on the second teeth 31, i.e., between adjacent second slots 30, and includes an ejection portion 34a disposed on the radially outer side and an ejection portion 34b disposed on the radially inner side. The ejection portions 34a and the ejection portions 34b are disposed on each second tooth 31 so as to be alternately arranged in pairs in the circumferential direction. Since the ejection portions 34 are disposed between adjacent second slots 30 in this manner, it is possible to dispose the ejection portion 34 near the coil end 40, for example, so that the ejection portion 34b is disposed near the coil end 40 disposed on the radially inner side, regardless of the radial position of the coil end 40 of the coil 4 inserted through the first slot 20 and the second slot 30, and to eject oil from near the coil end 40. This allows the oil to be reliably sprayed on the coil end 40.

[0059] As shown in Figs. 5 and 6, the first connection portion 35 is a circular hole that opens axially inward and is provided on the axially inner portion of the oil guide 3A. The first connection portion 35 in the front oil guide 3F is connected to the inlet of the in-core flow path 22R, and similarly, the first connection portion 35 in the rear oil guide 3R is connected to the inlet of the in-core flow path 22F. For this reason, the first connection portion 35 is disposed at a circumferential position and a radial position corresponding to the inlet of the in-core flow path 22. The opening area of ​​the first connection portion 35 is set smaller than the opening area of ​​the inlet of the in-core flow path 22. This makes it possible to increase the inflow pressure of oil into the in-core flow path 22.

[0060] As also shown in FIG. 5 and FIG. 6, the second connection portion 36 is an elongated hole that opens axially inward and has a circumferential length corresponding to the circumferential width of the outlet of the in-core flow path 22, and is provided on the axially inner side of the oil guide 3A. The second connection portion 36 in the front oil guide 3F is connected to the outlet of the in-core flow path 22F, and similarly, the second connection portion 36 in the rear oil guide 3R is connected to the outlet of the in-core flow path 22R. For this reason, the second connection portion 36 is disposed at a circumferential position and a radial position corresponding to the outlet of the in-core flow path 22. The opening area of ​​the second connection portion 36 is set to be approximately the same as the opening area of ​​the outlet of the in-core flow path 22. As shown in FIG. 6, the first connection portion 35 and the second connection portion 36 are disposed so as to be alternately arranged in pairs in the circumferential direction in correspondence with the arrangement of the in-core flow paths 22F and 22R.

[0061] As shown in Figs. 4 and 5, the sub-ejection portion 37 is a circular hole that opens axially outward and is provided on the axially outer side of the oil guide 3A. The sub-ejection portions 37 are arranged at circumferential positions corresponding to the second connection portion 36, radially outward from the second slots 30, and spaced apart from each other in the circumferential direction. The sub-ejection portion 37 has an opening area smaller than that of the second connection portion 36, and is connected to the second connection portion 36 by a flow path 370. The flow path 370 is formed so that the cross-sectional area perpendicular to its extension direction (the axial direction in this embodiment) gradually decreases from the second connection portion 36 toward the sub-ejection portion 37. This makes it possible to increase the ejection pressure of oil from the sub-ejection portion 37.

[0062] Like the flow path 370 continuing to the sub-jetting portion 37, the flow path continuing to the jetting portion 34 (the flow path connecting the jetting portion 34 and the chamber 32A) may be formed so that the cross-sectional area perpendicular to the extension direction gradually decreases from the chamber 32A toward the jetting portion 34. This makes it possible to increase the jetting pressure of oil from the jetting portion 34 in the same manner as described above.

[0063] In addition to the above configuration, as shown in Figures 5 and 6, the oil guide 3A is provided with a plurality of plug claws 38 for positioning the oil guide 3A with respect to the stator core 2 by being inserted into the inlet of the in-core flow path 22. Each plug claw 38 is a projection that protrudes axially inward from an axially inner portion of the oil guide 3A, and is disposed on both circumferential ends of one of the two first connection portions 35 that are aligned consecutively. By providing the oil guide 3A with the plug claws 38 in this way, the oil guide 3A can be positioned with respect to the stator core 2 with a simple structure.

[0064] The above-mentioned jetting section 34 and sub-jetting section 37 are both configured to jet oil towards the coil ends 40, but are configured so that the oil falls on each of the coil ends 40. More specifically, the jetting section 34 and the sub-jetting section 37 are configured so that they each target different coil ends 40, that is, they each jet oil towards a different coil end 40. This allows the oil to be sprayed on each of the coil ends 40, and therefore the entire coil 4 can be cooled more efficiently.

[0065] Moreover, the above-mentioned jetting portion 34 and sub-jetting portion 37 are configured in more detail as follows so as to jet oil in a manner suited to the arrangement and shape of each of the coil ends 40 to be jetted.

[0066] -Ejection patterns of the ejection section and sub-ejection section- FIG. 15 is a diagram for explaining the ejection mode of the ejection portion 34 and the sub-ejection portion 37. FIG. 16 is an enlarged view of the ejection portion 34a on the radially outer side and the coil end 40b that is the ejection target. Note that, for convenience of illustration, FIG. 16 omits the illustration of the coil end 40a that overlaps the coil end 40b on the radially outer side. FIG. 17 is an enlarged view of the ejection portion 34b on the radially inner side and the coil end 40c that is the ejection target. Note that, for convenience of illustration, FIG. 17 omits the illustration of the coil end 40b that overlaps the coil end 40c on the radially outer side and the coil end 40a that overlaps the coil end 40b on the radially outer side.

[0067] As an example of the spraying mode, spray section 34a (radially outer spray section) shown surrounded by ellipse P1 in Fig. 15 has coil end 40b shown in Fig. 16 as a spray target, and is configured to spray oil toward inner portion 42 of inclined portion 41 of coil end 40b facing the oil guide 3A. Similarly, spray section 34b (radially inner spray section) shown surrounded by ellipse P2 in Fig. 15 has coil end 40c overlapping radially inside coil end 40b as a spray target, and is configured to spray oil toward inner portion 42 of inclined portion 41 of coil end 40c facing the oil guide 3A, as shown in Fig. 17.

[0068] The ejection portions 34a, 34b configured as described above eject oil toward the inner portions 42 of the inclined portions 41 of the coil ends 40b, 40c, i.e., the portions close to the oil guide 3A. This ensures that the oil is sprayed onto the coil ends 40b, 40c. As an additional effect, spraying the oil onto the inclined portions 41 of the coil ends 40b, 40c causes the oil to move axially outward along the inclined portions 41, thereby more efficiently cooling the coil ends 40b, 40c.

[0069] 16 and 17, the ejection portions 34a, 34b are configured to eject oil particularly toward the radial outside of the coil ends 40b, 40c. As a result, in the coil ends 40b, 40c arranged on the 12 o'clock side (upper side) in the clockwise direction of the oil guide 3A, i.e., the coil ends 40b, 40c arranged on the upper side of the oil guide 3A, oil moves downward along the coil ends 40b, 40c due to its own weight, so that the coil ends 40b, 40c can be cooled more efficiently.

[0070] Fig. 18 is an enlarged view of the sub-ejection part 37 and the coil end 40a which is the ejection target. Fig. 19 is a schematic vertical cross-sectional view showing the coil end 40a and its surroundings, which are arranged below the oil guide 3A. In addition to the above example, the sub-ejection part 37 shown in the ellipse P3 in Fig. 15 has the coil end 40a shown in Fig. 18 as the ejection target, and is configured to eject oil from the radial outside of the coil end 40 inward in the radial direction. More specifically, as shown in Fig. 19, the flow path 370 connected to the sub-ejection part 37 is inclined radially inward (upward in Fig. 19) toward the sub-ejection part 37.

[0071] By the sub-jet portion 37 configured as described above, oil is jetted radially inward toward the step portion 43 of the coil end 40a located radially inside the sub-jet portion 37. In particular, as shown in Fig. 19, oil is jetted upward against gravity toward the coil end 40a located on the 6 o'clock side (lower side) in the clockwise direction of the oil guide 3A, i.e., toward the step portion 43 of the coil end 40a located above the sub-jet portion 37. This ensures that oil is sprayed onto the coil end 40a located radially inside the sub-jet portion 37.

[0072] Although not shown in the figure, a portion of the ejection portion 34 may be configured to eject oil radially inward from a position radially outside the coil end 40, similar to the above-mentioned sub-ejection portion 37. Even in this case, the oil can be reliably sprayed onto the coil end 40, which is located radially inside the ejection portion 34, similar to the above-mentioned case.

[0073] (Housing configuration) Returning to Fig. 1, the housing 9 includes a cylindrical main body 91 and a pair of bottomed cylindrical lids 92 arranged to close openings at each axial end of the main body 91. A hole 920 for passing the shaft 10 therethrough is formed in the bottom of the lid 92. The lids 92 are fixed to each axial end of the main body 91 using fasteners such as bolts (not shown).

[0074] When the cover portion 92 is fixed to the main body portion 91, the cover portion 92 contacts the sub-oil guide 5 arranged at the axial end of the stator 12 at the bottom inner surface 92a and presses the sub-oil guide 5 inward in the axial direction. In this state, the oil guide 3A arranged axially inside the sub-oil guide 5 is pressed against the stator core 2 in the axial direction via the sub-oil guide 5 by the pressure of the cover portion 92. That is, the housing 9 is configured to press the oil guide 3A of the stator 12 against the stator core 2 in the axial direction. The housing 9 configured in this manner suppresses oil leakage from between the stator core 2 and the oil guide 3A without providing a sealing member such as an O-ring between the stator core 2 and the oil guide 3A. This allows the number of parts of the motor unit A to be reduced, and therefore the cost of the motor unit A to be reduced.

[0075] According to the stator 12 described above, the oil guide 3A having the introduction section 33A and the outlet section 34 allows the oil supplied from the outside to reach the coil ends 40 in a fresh state without having absorbed heat from other components of the stator 12, thereby resulting in the effect of efficiently cooling the coils 4.

[0076] In addition to the above effects, an additional effect is that by making the oil guide 3A separate from the stator core 2, the oil guide 3A can be provided on the stator 12 without affecting the strength or productivity of the stator core 2.

[0077] Furthermore, as described above, since the oil guide 3A is formed from a resin material, the freedom of processing of the oil guide 3A can be improved, and therefore the arrangement and shape of the ejection portion 34 can be freely set depending on the mounting manner of the coil 4 relative to the stator core 2 and the oil guide 3A, more specifically, so as to eject oil in a manner suitable for the arrangement and shape of the coil end 40 to be ejected.

[0078] Furthermore, as described above, by providing the guide groove portion 50 in the sub-oil guide 5, oil supplied from the outside is guided to the introduction portion 33A in the oil guide 3A along the guide groove portion 50 in the outer circumferential portion 5p of the sub-oil guide 5. This makes it possible to guide the oil supplied from the outside to the introduction portion 33A without expanding the size of the stator 12 radially outward beyond the oil guide 3A, and therefore makes it possible to introduce the oil into the introduction portion 33A with a simple and space-saving structure.

[0079] A liquid other than oil may be used as the refrigerant. The oil guide 3A may be provided at least on one axial end side of the stator core 2. Even in this case, the coil 4 can be efficiently cooled in the same manner as in the above case. The oil guides 3F, 3R may be formed in different shapes.

[0080] The oil guide 3A may be made of a non-magnetic material other than a resin material, such as ceramics. Since the oil guide 3A is made of a non-magnetic material, the oil guide 3A can be provided on the stator 12 without exerting a magnetic effect on the motor 1.

[0081] Depending on the shape of the oil guide 3A and the layout of the entire motor 1 including the stator 12, one sub-oil guide 5 may be provided at one end in the axial direction, or no sub-oil guide 5 may be provided.

[0082] The arrangement and shape of the ejection portion 34 and the sub-ejection portion 37 are not limited to those described above, and may be appropriately set depending on the mounting manner of the coil 4 to the stator core 2 and the oil guide 3A, more specifically, so as to eject oil in a manner suitable for the arrangement and shape of the coil end 40 to be ejected. For example, a part of the ejection portion 34 may be disposed radially outward of the coil end 40, and another part of the ejection portion 34 may be disposed between adjacent second slots 30, or the sub-ejection portion 37 may be disposed between adjacent second slots 30.

[0083] The ejection unit 34 and the sub-ejection unit 37 may be configured to eject oil toward the same coil end 40, i.e., to eject oil toward the same coil end 40. The ejection unit 34 and the sub-ejection unit 37 may be configured to eject oil toward two or more coil ends 40, i.e., to eject oil toward two or more coil ends 40.

[0084] Furthermore, as in the second and third flow patterns described above, it is sufficient for the sub-injection section 37 to be configured to inject oil flowing from one oil guide toward the coil end 40 on the other side, and therefore it is sufficient for it to be provided in the other oil guide (the rear oil guide 3R in the second flow pattern, and the front oil guide 3F in the third flow pattern).

[0085] The manner in which the coil 4 is attached to the stator core 2 and the oil guide 3A is not limited to the above, but may be appropriately set according to the shapes of the stator core 2 and the oil guide 3A. The coil 4 is also not limited to the above, and may be other than an SC winding, such as a continuous winding.

[0086] (Embodiment 2) 20 is a schematic front view showing oil guide 3B in embodiment 2. Next, the configuration of oil guide 3B in embodiment 2 of the present invention will be described, focusing on the differences from oil guide 3A in embodiment 1 above.

[0087] As shown in FIG. 20, the oil guide 3B in the second embodiment is provided with a peripheral wall portion 323 that continuously surrounds the annular portion 320 from the radial outside. Here, "continuously" does not necessarily mean the entire circumference (360 degrees), but is a concept that includes a case where a part is interrupted by less than 30 degrees as shown in FIG. 20. The upper part of the peripheral wall portion 323 is interrupted, and this interrupted part is the introduction portion 33B in the second embodiment. Such a peripheral wall portion 323 occupies the space on the radial outside of the annular portion 320, so that the flow path volume in the oil guide 3B is reduced. This makes it possible to suppress the occurrence of air accumulation in the oil guide 3B, and therefore to suppress the decrease in the ejection pressure of the oil from the oil guide 3B.

[0088] FIG. 21 is an enlarged view of the upper side of the oil guide 3B in FIG. 20. As shown in FIG. 21, each branch portion 324 in the second embodiment is connected to the ejection portion 34 or the first connection portion 35. The terminal end 325, which is the radially inner end of the branch portion 324, is rounded, and the edge of the terminal end 325 of the branch portion 324 connected to the ejection portion 34 is tangent to the edge of the ejection portion 34. Therefore, the chamber 32B in the second embodiment is connected to the ejection portion 34 at the terminal end of the branch portion 324. Due to the chamber 32B connected to the ejection portion 34 in this way, there is no space on the terminal side of the part connected to the ejection portion 34 in the branch portion 324. This makes it possible to suppress the occurrence of air accumulation at the terminal end of the branch portion 324, and therefore to suppress the decrease in the ejection pressure of the oil from the oil guide 3B.

[0089] As in the case of the above-mentioned ejection part 34, the chamber 32B in the second embodiment is connected to the first connection part 35 at the end of the branch part 324. This makes it possible to prevent air from being trapped at the end of the branch part 324, as in the case of the above-mentioned ejection part 34, and therefore makes it possible to prevent the inflow pressure of the oil into the in-core flow path 22 from decreasing.

[0090] FIG. 22 is a schematic vertical cross-sectional view showing a flow path 371 continuing to the sub-ejection portion 39 in the second embodiment. Specifically, FIG. 22 shows the AA cross section in FIG. 21. As shown in FIG. 21, the oil guide 3B in the second embodiment is provided with the sub-ejection portion 39 radially outward from the second slot 30, as in the oil guide 3A in the first embodiment. However, the sub-ejection portion 39 in the second embodiment is a rectangular hole and is disposed adjacent to the second slot 30. As shown in FIG. 22, the flow path 371 continuing from the second connection portion 36 to the sub-ejection portion 39 is provided with an opening portion 372 that opens to the second slot 30 side. Such an opening portion 372 allows the coil 4 inserted in the second slot 30 to face the flow path 371 through the opening portion 372, thereby increasing the contact area between the coil 4 and the oil. More specifically, a part of the oil flowing through the flow path 371 flows from the opening portion 372 into the second slot 30, and falls on the coil 4 inserted in the second slot 30. Therefore, the coil 4 can be cooled more efficiently.

[0091] Although not shown, if the ejection portion 34 is positioned radially outward from the second slot 30, an open portion may be provided in the flow path following the ejection portion 34 (the flow path connecting the ejection portion 34 and the chamber 32A), similar to the above-mentioned flow path 371, and even in this case, the coil 4 can be cooled more efficiently, similar to the above-mentioned case.

[0092] The above embodiments are illustrative in every respect and are not intended to be limiting. Therefore, the technical scope of the present invention is not interpreted solely by the above embodiments and examples, but is defined by the claims. Furthermore, all modifications and changes within the scope of the claims are within the scope of the present invention. [Explanation of symbols]

[0093] A Motor unit 1 Motor 10 Shaft 11 Rotor 12 Stator 2 Stator core 20 1st Slot 22, 22F, 22R Core internal flow passage 3A, 3B, 3F, 3R Oil guide (guide material) 30 2nd Slot 32A, 32B Chamber 320 Circular section 321,324 Branch 323 Peripheral wall section 33A,33B Introduction section 34,34a,34b Spout part 35 First connection part (core connection part) 37,39 Sub-jet section 370,371 Flow path (flow path leading to the sub-jet section) 372 Open area 4 Coils 40, 40a, 40b, 40c Coil end 41 Slope 42 Inner part 5, 5F, 5R Sub-oil guide (sub-guide material) 5p Outer periphery 50 Guide groove 9. Housing

Claims

1. A cylindrical stator core; a ring-shaped guide member arranged coaxially with the stator core on at least one axial end side of the stator core; A stator including a coil attached to the stator core and the guide member such that a plurality of coil ends protrude from the guide member in an axial direction, The guide member includes: an introduction section into which a refrigerant supplied from an external source is introduced; a plurality of ejection portions that are in communication with the introduction portion and are configured to eject the refrigerant toward the plurality of coil ends; a stator, wherein some of the plurality of ejection portions are configured to eject the coolant radially inward from a radially outer side of the plurality of coil ends;

2. A cylindrical stator core; a ring-shaped guide member arranged coaxially with the stator core on at least one axial end side of the stator core; A stator including a coil attached to the stator core and the guide member such that a plurality of coil ends protrude from the guide member in an axial direction, The guide member includes: an introduction section into which a refrigerant supplied from an external source is introduced; a plurality of ejection portions that are in communication with the introduction portion and are configured to eject the refrigerant toward the plurality of coil ends; The stator core is formed with an inner-core flow passage passing through it in the axial direction, The guide member is provided with a core connection portion that communicates with the introduction portion and is connected to an inlet of the inner-core flow path.

3. 3. The stator according to claim 2, The guide members are disposed on both axial ends of the stator core, the two guide members are in communication with each other via the in-core flow passage such that a refrigerant flows from one guide member to the other guide member through the in-core flow passage, the other guide member is provided with a plurality of sub-ejection portions configured to eject the refrigerant flowing from the one guide member toward the coil end on the other side, the stator.

4. 4. The stator according to claim 3, The stator core is formed with a plurality of first slots passing therethrough in the axial direction, The other guide member has a plurality of second slots formed therein, the second slots corresponding to the plurality of first slots, the coil is inserted through the first slots and the second slots, Each of the sub-jet portions is disposed radially outward of each of the second slots in the other guide member, A stator, wherein a flow passage continuing to the sub-jet portion is provided with an opening portion that is open to the second slot side.

5. A cylindrical stator core; a ring-shaped guide member arranged coaxially with the stator core on at least one axial end side of the stator core; A stator including a coil attached to the stator core and the guide member such that a plurality of coil ends protrude from the guide member in an axial direction, The guide member includes: an introduction section into which a refrigerant supplied from an external source is introduced; a plurality of ejection portions that are in communication with the introduction portion and are configured to eject the refrigerant toward the plurality of coil ends; The guide member defines a chamber including a concentric annulus; The ejection portion communicates with the introduction portion through the chamber.

6. 6. The stator according to claim 5, The guide member is provided with a peripheral wall portion that continuously surrounds the annular portion from the radial outside.

7. 6. The stator according to claim 5, The chamber includes a plurality of branch portions branching radially inward from the annular portion, and the branch portions are connected to the ejection portion at their ends.

8. A cylindrical stator core; a ring-shaped guide member arranged coaxially with the stator core on at least one axial end side of the stator core; A stator including a coil attached to the stator core and the guide member such that a plurality of coil ends protrude from the guide member in an axial direction, The guide member includes: an introduction section into which a refrigerant supplied from an external source is introduced; a plurality of ejection portions that are in communication with the introduction portion and are configured to eject the refrigerant toward the plurality of coil ends; a cylindrical sub-guide member arranged coaxially with the guide member and axially outward of the guide member, The introduction portion of the guide member opens radially outward, A guide groove portion is provided on an outer periphery of the sub-guide member for receiving the refrigerant supplied from the outside and for guiding the refrigerant to the introduction portion.

9. A motor unit including a motor including a stator and a housing that accommodates the stator, The stator includes: A cylindrical stator core; a ring-shaped guide member arranged coaxially with the stator core on at least one axial end side of the stator core; a coil attached to the stator core and the guide member such that a plurality of coil ends protrude from the guide member in the axial direction, The guide member includes: an introduction section into which a refrigerant supplied from an external source is introduced; a plurality of ejection portions that are in communication with the introduction portion and are configured to eject the refrigerant toward the plurality of coil ends; A motor unit, wherein the housing is configured to press the guide member of the stator axially against the stator core.

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