Stator, rotary electric machine, and work machine

Abstract

This stator is provided with: a cylindrical stator core; and a stator coil having a first coil end protruding from a first end surface of the stator core and a second coil end protruding from a second end surface of the stator core. The first coil end is cooled by a cooling medium, and the protrusion amount of the first coil end is greater than the protrusion amount of the second coil end.

Description

Stator, rotating electric machine and work machine

[0001] This disclosure claims priority to Japanese Patent Application No. 2024-013357, filed on January 31, 2024, the contents of which are incorporated herein by reference.

[0002] A conventional rotating electric machine includes a rotor, a stator, and a housing (see Patent Document 1). The stator coil of the stator includes coil ends that protrude from end faces of a stator core.

[0003] Republished WO2017 / 168971

[0004] However, heat is likely to accumulate in the coil end where the coils are densely packed. Excessive heat generation in the coils increases losses, which can lead to a decrease in the performance of the rotating electrical machine.

[0005] An object of aspects of the present disclosure is to provide a stator, a rotating electric machine, and a work machine that can improve cooling performance.

[0006] A stator according to one aspect of the present disclosure comprises a cylindrical stator core and a stator coil having a first coil end protruding from a first end face of the stator core and a second coil end protruding from a second end face of the stator core, wherein the first coil end is cooled by a cooling medium, and the amount of protrusion of the first coil end is greater than the amount of protrusion of the second coil end.

[0007] According to aspects of the present disclosure, it is possible to provide a stator, a rotating electric machine, and a work machine that can improve cooling performance.

[0008] Fig. 1 is a schematic diagram showing a work machine according to an embodiment; Fig. 2 is a cross-sectional view of a rotating electric machine according to an embodiment; Fig. 3 is a perspective view of a stator according to an embodiment; Fig. 4 is a view showing a segment coil before being assembled to a stator core according to an embodiment; Fig. 5 is a view showing a segment coil according to an embodiment after being twisted; Fig. 6 is a perspective view of the upper part of a stator according to an embodiment.

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In this embodiment, an example will be described in which a rotating electric machine is mounted on a hybrid excavator or an electric excavator (an example of a work machine) and configured as a swing motor for swinging an upper swing body of the hybrid excavator or the electric excavator.

[0010] In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," do not only mean such arrangements or states in the strict sense, but also include arrangements or states in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. In the drawings used in the following description, the scale of each component may be changed as appropriate to make each component recognizable.

[0011] <Construction machine> Figure 1 is a schematic diagram showing a construction machine according to an embodiment. The construction machine 100 according to this embodiment is an electric hydraulic excavator. The construction machine 100 may be a manned vehicle that is operated by a driver, or an unmanned vehicle that is operated without a driver.

[0012] The work machine 100 includes a running body 120 , an upper rotating body 140 , and a work implement 160 .

[0013] The running body 120 supports the work machine 100 so that it can travel. The running body 120 is equipped with running devices 121. The running devices 121 are, for example, a pair of left and right caterpillars. The running devices 121 are driven by a traveling motor 122. The upper rotating body 140 is supported on the running body 120 so that it can rotate about a rotation axis. The upper rotating body 140 rotates relative to the running body 120 by the rotation motor 114. The upper rotating body 140 has a compartment 141 that houses a drive system.

[0014] The work implement 160 is operably supported on the upper rotating body 140. The work implement 160 is hydraulically driven. The work implement 160 includes a boom 161, an arm 162, and an attachment 163. The attachment 163 is an example of a working tool. In the example shown in FIG. 1, the attachment 163 is a bucket. In the example shown in FIG. 1, the side of the upper rotating body 140 on which the work implement 160 is supported is the front, and the opposite side with respect to the front is the rear. In this embodiment, the left-right direction refers to the left and right relative to the front, and the up-down direction refers to the direction in which the rotation axis of the upper rotating body 140 extends.

[0015] The swing motor 114 is an electric motor (an example of a rotating electric machine) that is driven by electricity. The swing motor 114 swings the upper swing body 140 relative to the traveling body 120.

[0016] <Rotating Electric Machine> Figure 2 is a cross-sectional view of a rotating electric machine 1 according to an embodiment. In this embodiment, the rotating electric machine 1 is a swing motor 114. The rotating electric machine 1 includes a rotor 2, a stator 3, and a housing 4 that accommodates the rotor 2 and the stator 3. The rotating electric machine 1 is an inner rotor type motor in which the stator 3 is disposed outside the cylindrical rotor 2. The rotating electric machine 1 is placed vertically so that the rotor shaft 20 of the rotor 2 is parallel to the swing axis.

[0017] In this embodiment, the upper side corresponds to one side parallel to the central axis CL of the rotor shaft 20, and the lower side corresponds to the other side parallel to the central axis CL of the rotor shaft 20. Hereinafter, the direction along the central axis CL of the rotor shaft 20 will be referred to as the "axial direction," the direction perpendicular to the axial direction will be referred to as the "radial direction," and the direction going around the central axis CL of the rotor shaft 20 will be referred to as the "circumferential direction."

[0018] The rotor 2 includes a rotor shaft 20, a rotor core 21, a first plate 22, and a second plate 23. The rotor shaft 20 is rotatably supported relative to the housing 4 by bearings 21A and 21B.

[0019] The rotor core 21 is formed by, for example, laminating electromagnetic steel sheets in the axial direction. The rotor core 21 is fitted onto the rotor shaft 20. The rotor core 21 rotates integrally with the rotor shaft 20. A plurality of permanent magnets (not shown) are embedded in the rotor core 21.

[0020] Each of the first plate 22 and the second plate 23 is annular plate members arranged coaxially with the rotor shaft 20. The first plate 22 and the second plate 23 are fitted to the rotor shaft 20. The first plate 22 and the second plate 23 sandwich the rotor core 21 from the outside in the axial direction. The first plate 22 and the second plate 23 rotate integrally with the rotor shaft 20 and the rotor core 21. In this embodiment, the first plate 22 is arranged on the opposite side of the housing 4 in the axial direction from a bottom 13, which will be described later. On the other hand, the second plate 23 is arranged on the same side of the housing 4 in the axial direction as the bottom 13, which will be described later.

[0021] The stator 3 is fixed to the inner surface of the housing 4 so as to cover the outer periphery of the rotor 2. The stator 3 includes a cylindrical stator core 30 and a stator coil 31. Like the rotor core 21, the stator core 30 is formed by laminating electromagnetic steel sheets in the axial direction. A plurality of teeth are provided circumferentially on the inner periphery of the stator core 30. The stator coil 31 is wound around the teeth.

[0022] The housing 4 accommodates the rotor 2 and the stator 3. The housing 4 includes a cylindrical body 10, a ceiling portion 11 that closes an opening on one side of the cylinder 10, and a bottom portion 13 that closes an opening on the other side of the cylinder 10. The cylinder 10, the ceiling portion 11, and the bottom portion 13 form a space 40 inside the housing 4 for accommodating the rotor 2 and the stator 3.

[0023] <Stator> Fig. 3 is a perspective view of the stator 3 according to the embodiment. Fig. 6 is a perspective view of the upper part of the stator 3 according to the embodiment. Referring to Figs. 2 to 6 together, the stator 3 includes a cylindrical stator core 30 having a plurality of slots 30s arranged in a circumferential direction, and a stator coil 31 inserted into each of the plurality of slots 30s and wound around the stator core 30, the stator coil 31 having a plurality of end-side extending portions 32e extending outward from a first axial end face 30f1 of the stator core 30 and arranged in a circumferential direction.

[0024] A plurality of slots 30s and a plurality of teeth 30t are arranged alternately around the inner periphery of the stator core 30. The plurality of slots 30s are arranged at equal intervals in the circumferential direction of the stator core 30. For example, an insulating material may be provided inside the slots 30s. Note that the configuration of the slots 30s (such as their arrangement, number, and shape) can be changed according to design specifications.

[0025] In this embodiment, the stator coil 31 is made of rectangular wire. The stator coil 31 is made of a plurality of segment coils 39 whose ends are connected to each other. The stator coil 31 is formed by winding a plurality of segment coils 39 whose ends are connected to each other in a wave-like pattern. For example, the segment coils 39 are rectangular wires with an insulating coating, in which an insulating coating is applied to the outer periphery of the wire. Note that the segment coils 39 are not limited to the above, and may be made up of windings with circular or elliptical cross sections. The configuration of the segment coils 39 can be changed according to the design specifications.

[0026] The stator coil 31 includes first coil ends 32 having multiple distal extensions 32e protruding from a first axial end face 30f1 of the stator core 30, and second coil ends 33 protruding from a second axial end face 30f2 of the stator core 30 opposite the first end face 30f1. The axial direction of the stator core 30 corresponds to the direction along the central axis CL (see FIG. 2) of the rotor shaft 20. Note that the radial direction of the stator core 30 is a direction perpendicular to the axial direction, and the circumferential direction is a direction going around the central axis CL.

[0027] In this embodiment, the first coil end 32 is disposed axially on the opposite side of the bottom 13 of the housing 4. On the other hand, the second coil end 33 is disposed axially on the same side as the bottom 13 of the housing 4. The multiple distal extensions 32e are disposed axially on the opposite side of the bottom 13 of the housing 4.

[0028] The stator 3 of this embodiment further includes power lines 35U, 35V, and 35W connected to the plurality of distal extension portions 32e. The plurality of distal extension portions 32e include connection extension portions to which the power lines 35U, 35V, and 35W are connected and non-connection extension portions to which the power lines 35U, 35V, and 35W are not connected. The power lines 35U, 35V, and 35W include stranded wires and terminals connected to the ends of the stranded wires. A power line connection portion 36 for connecting the power lines 35U, 35V, and 35W is connected to the connection extension portions. The power line connection portion 36 is connected to the terminals of the power lines 35U, 35V, and 35W.

[0029] In this embodiment, the power line connection portion 36 and the terminals of the power lines 35U, 35V, and 35W are connected by fastening with bolts and nuts. The configurations of the power lines 35U, 35V, and 35W and the power line connection portion 36 are not limited to those described above and can be changed according to design specifications. For example, the power lines 35U, 35V, and 35W may include a bus bar, and the bus bar and the connection extension may be welded. For example, the power lines 35U, 35V, and 35W may include a stranded wire and a terminal connected to an end of the stranded wire, and the terminal and the connection extension may be welded. For example, the power lines 35U, 35V, and 35W may include a stranded wire and a first terminal connected to an end of the stranded wire, and a second terminal may be connected to the connection extension, and the first terminal and the second terminal may be welded to each other.

[0030] Fig. 4 is a diagram showing the segment coil 39 before being assembled to the stator core 30 according to the embodiment. Fig. 5 is a diagram showing the segment coil 39 according to the embodiment after being twisted. Referring to Fig. 4 and Fig. 5 together, the segment coil 39 before being assembled to the stator core 30 is formed in a U-shape.

[0031] Specifically, the segment coil 39 includes a U-shaped portion 39a formed in a convex (U-shaped) shape that protrudes to one side in the axial direction, and two straight portions 39b1, 39b2 that extend parallel to each other in straight lines from each end of the U-shaped portion 39a to the other side in the axial direction. The U-shaped portion 39a constitutes the second coil end 33. The straight portions 39b1, 39b2, excluding the twisted portion, are inserted into the slot 30s.

[0032] For example, after the segment coil 39 is inserted into the slot 30s, the first extension portion 39c1 at one end is twisted toward one circumferential side, and the second extension portion 39c2 at the other end is twisted toward the other circumferential side. For example, of two segment coils 39 whose ends are connected to each other, the end of the twisted first extension portion 39c1 of one segment coil 39 is connected to the end of the twisted second extension portion 39c2 of the other segment coil 39 by welding or the like. In each segment coil 39, the connection portions between the end of the first extension portion 39c1 and the end of the second extension portion 39c2 are arranged so as to be aligned radially. Note that each extension portion 39c1, 39c2 constitutes the first coil end 32.

[0033] 2 , the protrusion amount A1 of the first coil end 32 is greater than the protrusion amount A2 of the second coil end 33. The protrusion amount A1 of the first coil end 32 refers to the distance from the first end face 30f1 of the stator core 30 to the protruding end of the first coil end 32 in the axial direction of the stator core 30. The protrusion amount A2 of the second coil end 33 refers to the distance from the second end face 30f2 of the stator core 30 to the protruding end of the second coil end 33 in the axial direction of the stator core 30.

[0034] For example, the protrusion amount A1 of the first coil end 32 may be 20 mm to 50 mm, or 30 mm to 40 mm. In this embodiment, the protrusion amount A1 of the first coil end 32 is approximately 35 mm. Note that the protrusion amount A1 of the first coil end 32 is not limited to the above and can be changed according to design specifications as long as it is greater than the protrusion amount A2 of the second coil end 33.

[0035] For example, the protrusion amount A2 of the second coil end 33 may be 5 mm to 35 mm, or 15 mm to 25 mm. In this embodiment, the protrusion amount A2 of the second coil end 33 is approximately 20 mm. Note that the protrusion amount A2 of the second coil end 33 is not limited to the above and can be changed according to design specifications.

[0036] 6, the first coil end 32 has a plurality of distal extension portions 32e that extend from the first end face 30f1 of the stator core 30 and are aligned in the circumferential direction of the stator core 30. Each of the distal extension portions 32e includes an inclined portion 32s that obliquely intersects with the axial and circumferential directions of the stator core 30. A gap G is formed between the first end face 30f1 of the stator core 30 and the inclined portion 32s.

[0037] For example, the minimum distance Smin of the gap G is 5 mm or more. The minimum distance Smin of the gap G refers to the distance in the axial direction of the stator core 30 from the first end face 30f1 of the stator core 30 to the end of the inclined portion 32s on the first end face 30f1 side. The end of the inclined portion 32s on the first end face 30f1 side corresponds to the bending position of the distal extension portion 32e near the first end face 30f1 of the stator core 30. In this embodiment, the minimum distance Smin of the gap G is approximately 6 mm. Note that the minimum distance Smin of the gap G is not limited to the above and can be changed according to design specifications.

[0038] 2 , the rotating electric machine 1 includes a refrigerant discharge portion 50 configured to discharge the cooling medium toward the first coil ends 32 through the space 40 in the housing 4. The refrigerant discharge portion 50 is a discharge hole for discharging the cooling medium toward the first coil ends 32. In this embodiment, the refrigerant discharge portion 50 is provided on the first plate 22. Note that in this embodiment, the refrigerant discharge portion 50 is not provided on the second plate 23.

[0039] Note that the refrigerant discharge portion 50 does not necessarily have to be provided on the first plate 22. For example, the refrigerant discharge portion 50 may be provided on the rotor shaft 20. For example, a plurality of discharge holes may be formed at intervals in the circumferential direction of the rotor shaft 20. The installation mode of the refrigerant discharge portion 50 can be changed according to design specifications.

[0040] <Flow of Coolant> With reference to Fig. 2, for example, a coolant supplied by a coolant pump (not shown) is sent to the inside of the rotating electrical machine 1. In Fig. 2, the flow of the cooling oil is indicated by white arrows.

[0041] Specifically, the cooling medium (e.g., cooling oil) supplied by the cooling medium pump flows into the internal passage of the rotor shaft 20. The cooling medium that has flowed into the internal passage of the rotor shaft 20 passes through the grooves of the second plate 23 and the through passages of the rotor core 21, and cools the rotor 2. The cooling medium that has passed through the through passages of the rotor core 21 is discharged from the refrigerant discharge portion 50 of the first plate 22 into the space 40 of the housing 4.

[0042] In this embodiment, the coolant is discharged from the refrigerant discharge portion 50 of the first plate 22 toward the first coil ends 32, which protrude more (have a larger cooling area) than the second coil ends 33. This cools the first coil ends 32.

[0043] When the rotating electric machine 1 is installed vertically, part of the cooling medium flows downward along the inner surface of the cylindrical body 10 of the housing 4. At least part of the cooling medium flowing along the inner surface of the cylindrical body 10 of the housing 4 hits the second coil ends 33, thereby cooling the second coil ends 33. The cooling medium then flows down into a fluid reservoir on the bottom 13 side of the housing 4.

[0044] The cooling medium that has flowed down into the fluid reservoir on the bottom 13 side is discharged from a fluid discharge path (not shown). The cooling medium discharged from the fluid discharge path is sent back into the interior of the rotating electrical machine 1 by a cooling medium pump. Note that the cooling medium may be something other than cooling oil (for example, cooling water).

[0045] <Operation and Effect> As described above, the stator 3 of this embodiment includes a cylindrical stator core 30 and a stator coil 31 having first coil ends 32 protruding from a first end face 30f1 of the stator core 30 and second coil ends 33 protruding from a second end face 30f2 of the stator core 30. The first coil ends 32 are cooled by a coolant, and the protrusion amount A1 of the first coil ends 32 is greater than the protrusion amount A2 of the second coil ends 33. According to this embodiment, the first coil ends 32, which protrude more than the second coil ends 33 (having an increased cooling area), are cooled by the coolant. This allows a larger amount of coolant to be applied to the first coil ends 32 efficiently, thereby improving cooling performance.

[0046] In this embodiment, the first coil end 32 has multiple distal extensions 32e that extend from the first end face 30f1 of the stator core 30 and are aligned in the circumferential direction of the stator core 30. According to this embodiment, the coolant is discharged toward the distal extensions 32e, which have a large cooling area. This allows a large amount of coolant to be applied efficiently to the distal extensions 32e. This further improves cooling performance.

[0047] In the present embodiment, each of the plurality of end-side extensions 32e includes an inclined portion 32s that obliquely intersects with the axial and circumferential directions of the stator core 30. A gap G is formed between the first end face 30f1 of the stator core 30 and the inclined portion 32s. According to the present embodiment, a larger amount of coolant can be applied to the first coil end 32 more efficiently through the gap G formed between the stator core 30 and the inclined portion 32s. This further improves cooling performance.

[0048] In this embodiment, the stator coil 31 is made of rectangular wire. This configuration makes it easier to miniaturize the stator coil 31 compared to when the stator coil 31 is made of round wire, contributing to further miniaturization. On the other hand, while rectangular wire allows for miniaturization, the coil ends are correspondingly smaller, which creates a tradeoff in that it becomes more difficult to cool the heat-generating parts. Even in this case, the cooling medium can be applied to the rectangular wire as described above, contributing to further improvement of cooling performance.

[0049] The rotating electric machine 1 of this embodiment includes the above-described stator 3, a housing 4 having a space 40 for accommodating the rotor 2 and the stator 3, and a refrigerant discharge section 50 configured to discharge the cooling medium toward the first coil ends 32 through the space 40. According to this embodiment, the cooling medium is discharged from the refrigerant discharge section 50 toward the first coil ends 32, which protrude more than the second coil ends 33 (having an increased cooling area). This allows a large amount of cooling medium to be applied efficiently to the first coil ends 32, thereby improving cooling performance.

[0050] In this embodiment, the refrigerant discharge portion 50 is provided on the rotor 2. According to this embodiment, rotation of the rotor 2 provided with the refrigerant discharge portion 50 allows a larger amount of cooling medium to be applied more efficiently to the first coil ends 32. This further improves cooling performance.

[0051] In the above-described embodiment, the first coil end has a plurality of distal extensions extending from the first end face of the stator core and aligned in the circumferential direction of the stator core. However, this is not limiting. For example, the second coil end may have a plurality of distal extensions extending from the second end face of the stator core and aligned in the circumferential direction of the stator core. The arrangement of the plurality of distal extensions can be changed according to design specifications.

[0052] In the above-described embodiment, each of the plurality of end-side extensions includes an inclined portion that obliquely intersects with the axial and circumferential directions of the stator core, and a gap is formed between the first end face of the stator core and the inclined portion. However, this is not limiting. For example, a member for filling the gap may be provided between the first end face of the stator core and the inclined portion. The manner in which the gap is formed between the first end face of the stator core and the inclined portion can be changed according to design specifications.

[0053] In the above-described embodiment, the stator coil is made of rectangular wire, but this is not limiting. For example, the stator coil may be made of round wire. The configuration of the stator coil can be changed according to the design specifications.

[0054] In the above-described embodiment, the refrigerant discharge portion is provided on the rotor, but this is not limiting. For example, the refrigerant discharge portion may be provided on the housing. For example, holes (e.g., multiple holes spaced apart in the circumferential direction) for discharging the cooling medium toward the first coil end may be formed in the ceiling of the housing. The installation mode of the refrigerant discharge portion can be changed depending on the design specifications.

[0055] In the above-described embodiment, the stator coil is described as including a plurality of U-shaped segment coils whose ends are connected to each other, but this is not limiting. For example, the stator coil may include a coil wound in a continuous wave pattern. The configuration of the stator coil can be changed according to the design specifications.

[0056] In the above-described embodiment, the rotating electric machine includes a rotor, the stator, and a housing that accommodates the rotor and the stator, and the plurality of distal extensions are disposed on the axially opposite side of the housing from the bottom. However, this is not limiting. For example, the plurality of distal extensions may be disposed on the same axial side of the housing as the bottom (opposite the opening). The arrangement of the plurality of distal extensions can be changed according to design specifications.

[0057] In the above-described embodiments, the rotating electric machine is mounted on a hybrid excavator or an electric shovel, and an electric swing motor for swinging the upper swing body of the hybrid excavator or the electric shovel has been described as an example, but the present invention is not limited to this. For example, the rotating electric machine may be mounted on other work machines such as a wheel loader, a bulldozer, or a dump truck. For example, the rotating electric machine may be configured as a drive motor for driving a hydraulic pump or a work machine, or as a drive motor for driving a travel device. The type of work machine on which the rotating electric machine is mounted and the object that the rotating electric machine drives can be changed depending on the design specifications.

[0058] In the above-described embodiment, the rotating electric machine is described as being vertically disposed so that the rotor shaft is parallel to the rotation axis, but this is not limiting. For example, the rotating electric machine may be horizontally disposed so that the rotor shaft is perpendicular to the rotation axis. For example, the rotating electric machine may be disposed at an angle so that the rotor shaft intersects the rotation axis at an angle. The arrangement of the rotating electric machine can be changed according to the design specifications.

[0059] In the above-described embodiment, the rotating electric machine is an inner rotor type rotating electric machine in which a stator is disposed outside a cylindrical rotor, but the present invention is not limited to this. For example, the rotating electric machine may be an outer rotor type rotating electric machine in which a stator is disposed inside a cup-shaped rotor. The type of rotating electric machine can be changed depending on the design specifications.

[0060] In the above-described embodiment, the rotating electric machine is described as a motor that drives and rotates a rotor by passing an alternating current through a stator coil, but the present invention is not limited to this. For example, the rotating electric machine may be a generator that generates electricity by rotating a rotor using power from an engine or the like. The configuration of the rotating electric machine can be changed according to design specifications.

[0061] In the above-described embodiment, the refrigerant discharge portion is provided on the first plate of the coil end, but this is not limiting. For example, the refrigerant discharge portion may be provided on both the first plate and the second plate. The refrigerant discharge portion on the second plate is configured to cool the second coil end. Note that the flow rate of the cooling medium discharged from the refrigerant discharge portion on the first plate may be greater than the flow rate of the refrigerant medium discharged from the refrigerant discharge portion on the second plate.

[0062] In the above-described embodiment, the refrigerant discharge portion is provided on the first plate of the coil end, but this is not limiting. For example, the refrigerant discharge portion may be provided on the second plate. For example, the refrigerant discharge portion may be located on the second plate side, and the first coil end may also be located on the second plate side.

[0063] Although one embodiment has been described above with reference to the drawings, the specific configuration is not limited to that described above, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the present disclosure, and the above-described embodiments can also be combined as appropriate.

[0064] DESCRIPTION OF SYMBOLS 1...Rotating electric machine, 2...Rotor, 3...Stator, 4...Housing, 22...First plate, 30...Stator core, 30f1...First end surface of stator core, 30f2...Second end surface of stator core, 31...Stator coil, 32...First coil end, 32e...Terminal extension, 32s...Inclined portion, 33...Second coil end, 40...Space, 50...Refrigerant discharge portion, 100...Work machine, 114...Swing motor, 120...Traveling body, 140...Upper swing body, 160...Work machine, A1...Protrusion amount of first coil end, A2...Protrusion amount of second coil end, G...Gap

Claims

1. A stator comprising: a cylindrical stator core; and a stator coil having a first coil end protruding from a first end face of the stator core and a second coil end protruding from a second end face of the stator core, wherein the first coil end is cooled by a cooling medium, and the amount of protrusion of the first coil end is greater than the amount of protrusion of the second coil end.

2. A stator according to claim 1, wherein the first coil end has a plurality of terminal extensions extending from the first end face of the stator core and aligned in the circumferential direction of the stator core.

3. A stator according to claim 2, wherein each of the plurality of end-side extension portions includes an inclined portion that intersects obliquely with the axial direction and the circumferential direction of the stator core, and a gap is formed between the first end face of the stator core and the inclined portion.

4. A stator according to any one of claims 1 to 3, wherein the stator coil is made of rectangular wire.

5. A rotating electric machine comprising: a stator according to any one of claims 1 to 3; a housing having a space for accommodating a rotor and the stator; and a refrigerant discharge section configured to discharge the cooling medium through the space toward the first coil end.

6. The rotating electric machine according to claim 5, wherein the refrigerant discharge portion is provided on the rotor.

7. A work machine comprising: a running body; an upper rotating body supported on the running body so as to be rotatable about a rotation axis; a work implement supported operably on the upper rotating body; and a rotating electric machine according to claim 5 configured as a rotation motor for rotating the upper rotating body relative to the running body.

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