KR102198959B1 - Motor - Google Patents

Abstract

The motor includes a housing; A stator disposed inside the housing; A rotor positioned inside the stator; A stator core comprising a shaft connected to the rotor, the stator having teeth and slots; A first stator core including a coil wound in the slot, wherein the stator core has a plurality of first cooling channels penetrated in an axial direction; A second stator core through which a plurality of second cooling channels are passed in the axial direction; And a cooling fluid guide disposed between the first stator core and the second stator core and forming a first cooling channel and a supply channel communicating with the second cooling channel between the first stator core and the second stator core.

Description

Motor{Motor}

The present invention relates to a motor, and more particularly, to a motor having a stator and a rotor.

In general, a motor (or electric motor) is a device that converts electrical energy into mechanical energy by using the force received by a conductor through which an electric current flows in a magnetic field.

In recent years, in order to prevent environmental pollution caused by harmful gases generated during fuel combustion of a vehicle, examples in which a motor is used as a driving source of a vehicle are gradually increasing.

When the motor is driven, high heat is generated, and the efficient heat dissipation of the motor can be an important factor determining the performance of the motor.

The motor may be cooled by air cooling using air and water cooling using cooling water.

When the motor is cooled by water cooling, in the motor, a water jacket through which the cooling water passes is disposed between the motor housing and the stator, or in the motor housing itself, a cooling water flow path through which the cooling water passes may be formed, and supplied from the outside of the motor. The coolant can cool the housing and stator while passing through the water jacket or coolant flow path.

Such a motor in which a water jacket is disposed or a cooling water flow path is formed is an indirect cooling method in which heat inside the motor is absorbed by cooling water through a water jacket or a motor housing, and this indirect cooling method has a problem of low cooling efficiency.

When the motor includes a water jacket, an assembly process for mounting the water jacket is complicated. In addition, when the cooling water flow path is formed in the motor housing, there is a problem in that the manufacturing cost of the motor housing is increased due to the complex shape and structure of the housing structure. On the other hand, when the motor is cooled by water cooling as described above, the total volume of the motor increases as much as the volume occupied by the water jacket or the cooling water flow path, and there is a problem that it cannot be compact.

Meanwhile, in the motor, a cooling fluid such as oil or a compressible refrigerant can directly cool the inside of the motor.

An example of such a motor may be configured such that the cooling fluid is injected directly into the motor, and Korean Patent Publication KR 10-1238209 B1 (announced on March 4, 2013) uses a compressible refrigerant used in a vapor compression refrigeration cycle. An injection pipe for cooling by direct injection into the interior is disclosed.

The motor disclosed in Korean Registered Patent Publication KR 10-123820 B1 has an inlet and an outlet for inflow and outflow of a compressible refrigerant in a cover, and an injection pipe receiving part for receiving a refrigerant injection pipe in a frame and a stator, respectively, and a compressible refrigerant A spray hole for injecting a compressible refrigerant toward the end of the stator coil is formed in the refrigerant injection pipe for injecting.

However, the motor using the compressible refrigerant as described above has low cooling efficiency due to an increase in flow path pressure due to evaporation of the compressible refrigerant, and there is an inconvenience of frequently filling the compressible refrigerant when the compressible refrigerant leaks, and the maintenance cost of the motor increases. There is a problem.

On the other hand, it is possible to use oil as a cooling fluid for cooling the inside of the motor, and an example of such a motor is disclosed in Korean Patent Publication KR 10-1340403 B1 (December 11, 2013). In the motor disclosed in Korean Patent Publication KR 10-1340403 B1, an oil introduction passage through which oil is introduced into the rotor shaft is formed, an oil passage is formed in the rotor, and the oil introduced through the oil introduction passage of the rotor shaft is transferred to the rotor shaft. After passing through the gap between the rotor and the rotor, it can pass through the oil flow path of the rotor, and the oil can cool the rotor shaft and the rotor by sequentially passing through the rotor shaft, the gap between the rotor shaft and the rotor, and each of the rotor. .

However, since the motor disclosed in Korean Patent Application Publication No. KR 10-1340403 B1 forms a flow path through which oil passes between the rotor shaft, the rotor shaft and the rotor, and in each of the rotor, the structure is complicated and the manufacturing process is complicated, so that the cost is high. There is an increasing problem, the temperature difference between the inlet side and the outlet side of the oil passages formed in the rotor may be large, and the temperature difference between one end and the other end of the rotor may be large.

On the other hand, in Korean Patent Application Publication No. KR 10-2017-0086903 A (published on July 27, 2017), a cooling groove through which cooling fluid flows in is formed in a part of the outer peripheral surface of the stator core, and the supply that communicates with the cooling groove is formed in the housing. A motor device in which a channel portion is formed is disclosed.

However, in the motor device disclosed in Korean Patent Application Publication No. KR 10-2017-0086903 A (published on July 27, 2017), a cooling groove is formed in a part of the outer circumference of the stator core so that the cooling fluid is in the cooling groove. It can stay, and if the distance between the cooling groove and the slot is long, it may be difficult to quickly dissipate the coil.

Korean Patent Publication KR 10-1238209 B1 (announced on March 4, 2013) Korean Patent Publication KR 10-1340403 B1 (announced on December 11, 2013) Republic of Korea Patent Publication KR 10-2017-0086903 A (published on July 27, 2017)

An object of the present invention is to provide a motor capable of cooling a stator coil more quickly.

Another object of the present invention is to provide a motor capable of minimizing temperature variation of each of the stator core and coil.

A housing according to an embodiment of the present invention; A stator disposed inside the housing; A rotor positioned inside the stator; A stator core comprising a shaft connected to the rotor, the stator having teeth and slots; A first stator core including a coil wound in the slot, wherein the stator core has a plurality of first cooling channels penetrated in an axial direction; A second stator core through which a plurality of second cooling channels are passed in the axial direction; And a cooling fluid guide disposed between the first stator core and the second stator core and forming a supply channel communicating with the first cooling channel and the second cooling channel between the first stator core and the second stator core.

Each of the plurality of first cooling channels and the plurality of second cooling channels may be closer to the slot than the outer circumference of the stator core.

Each of the plurality of first cooling channels and the plurality of second cooling channels may be spaced apart from the slot in the circumferential direction.

Each of the plurality of first cooling channels and the plurality of second cooling channels may be spaced apart from the slot in a radial direction.

The cross-sectional area of the supply channel may be greater than the sum of the cross-sectional areas of the plurality of first cooling channels and the cross-sectional area of the plurality of second cooling channels, respectively.

Each of the first stator core and the second stator core includes an inner region in which the teeth and slots are formed, and an outer region in which the teeth and slots are not formed, and the supply channel is a first opening in the radial direction of the stator. Channel; A second channel communicating with the first channel and facing the outer region in an axial direction may be included.

The supply channel may further include a third channel communicating with the second channel and facing each of the first cooling channel and the second cooling channel.

Each of the plurality of first cooling channels and the plurality of second cooling channels may communicate with the second channel.

The cooling fluid guide may include an outer guide whose one side is open in a radial direction, and an inner tooth that faces teeth of each of the first and second stator cores in an axial direction.

The inner tooth may have a channel open toward the axial direction and the outer guide.

An inlet flow path provided in the housing; And an outer flow path for injecting a pair of coil ends of the cooling fluid introduced into the inlet flow path, and at least one of the inlet flow path and the outer flow path may communicate with the supply channel.

The motor includes an inlet flow path provided in the housing; It may include an outer flow path for injecting a pair of coil ends of the cooling fluid introduced into the inlet flow path.

The outer flow path is formed in an arc shape, a first outer flow path in which a plurality of injection holes toward any one of the pair of coil ends are spaced apart in a circumferential direction, and the other one of the pair of coil ends is formed in an arc shape. A second outer flow path in which a plurality of facing injection holes are spaced apart in a circumferential direction, and a connecting flow path that connects the first outer flow path and the second outer flow path and communicates with the inlet flow path may be included.

According to an embodiment of the present invention, since the cooling fluid is distributed to the supply channel formed between the first stator core and the second stator core into the first cooling channel and the second cooling channel, the stator core and the coil can be evenly cooled. , The temperature deviation of each of the stator core and coil can be minimized.

In addition, each of the plurality of first cooling channels and the plurality of second cooling channels may be positioned as close as possible to the slot and the coil, and heat transferred from the coil to the stator core may be dissipated more quickly.

In addition, the cross-sectional area of the supply channel is formed larger than the sum of the cross-sectional areas of the plurality of first cooling channels and the sum of the cross-sectional areas of the plurality of second cooling channels, so that the cooling fluid flows through the supply channel to the plurality of first cooling channels and the plurality of second cooling channels. It can be supplied quickly, and the heat of the stator can be dissipated more quickly.

In addition, the supply channel includes a first channel opened in the radial direction of the stator, and a second channel communicating with the first channel and facing an outer region in the axial direction, so that cooling fluid can be quickly supplied from the outside of the stator to the inside of the stator. I can.

In addition, the supply channel includes the second channel, the first cooling channel, and the third channel communicating with each of the second cooling channel, so that the formation positions of the first cooling channel and the second cooling channel are aligned with the second channel in the axial direction. The first cooling channel and the second cooling channel may each be formed in a position capable of maximizing heat dissipation performance.

In addition, each of the plurality of first cooling channels and the plurality of second cooling channels is in communication with the second channel, so that the flow resistance of the cooling fluid is minimized, and the cooling fluid can flow quickly to each of the plurality of first cooling channels and the plurality of second cooling channels. I can.

In addition, the cooling fluid guide includes an outer guide and an inner tooth, so that the cooling fluid guide not only has a function of guiding the cooling fluid, but also the coil can be wound around the stator core with high reliability.

In addition, a channel open toward the axial direction and the outer guide may be formed in the inner tooth to guide the cooling fluid flowing into the outer guide to the plurality of first cooling channels and the plurality of second cooling channels, respectively.

In addition, the cooling fluid flowing into one inlet flow path can be supplied to each of the outer flow path and the supply flow path of the stator core spraying the pair of coil ends, thereby minimizing the number of inlet flow paths and quickly cooling the entire coil. can do.

In addition, the cooling fluid can be sprayed from the arc-shaped first outer flow path and the arc-shaped second outer flow passage to the coil ends, so that a pair of coil ends can be quickly cooled while minimizing the axial length of the outer flow path. have.

1 is a cross-sectional view of a motor according to an embodiment of the present invention,
2 is a cross-sectional view showing a cooling channel of a stator according to an embodiment of the present invention;
3 is a perspective view of a motor according to an embodiment of the present invention,
4 is a perspective view showing a stator, a rotor, and a shaft according to an embodiment of the present invention;
5 is an exploded perspective view of the stator shown in FIG. 4;
6 is a side view of a stator according to an embodiment of the present invention,
7 is a cross-sectional view showing a cooling channel of a stator according to another embodiment of the present invention;
8 is a side view of a stator according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail together with the drawings.

1 is a cross-sectional view showing a motor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a cooling channel of a stator according to an embodiment of the present invention, and FIG. 3 is A perspective view of a motor, FIG. 4 is a perspective view showing a stator, a rotor, and a shaft according to an embodiment of the present invention, FIG. 5 is an exploded perspective view of the stator shown in FIG. 4, and FIG. 6 is an embodiment of the present invention It is a side view of the stator according to.

The motor includes a housing 1; A stator (2) disposed inside the housing (1); A rotor 3 positioned inside the stator 2; It comprises a shaft 4 connected to the rotor 3.

The housing 1 may be composed of a combination of a plurality of members. The housing 1 includes a motor housing 12 having a space 11 accommodating the stator 2 and the rotor 3 therein, and at least one motor cover 13 and 14 coupled to the motor housing 12 It may include.

Bearings 15 and 16 rotatably supporting the shaft 4 may be disposed on the motor covers 13 and 14.

The stator 2 may be accommodated in the space 11. The stator 2 may be coupled to the housing 1. The stator 2 may be formed in a hollow shape.

The stator 2 includes a stator core 6; It includes a coil (C).

The inner circumferential surface of the stator core 6 may surround the outer circumferential surface of the rotor 3. A gap may be formed between the inner peripheral surface of the stator core 6 and the outer peripheral surface of the rotor 3.

The rotor 3 can be mounted on the shaft 4. The rotor 3 may be rotatably positioned inside the stator 2.

The rotor 3 may have a hollow cylindrical shape, the inner circumferential surface of the rotor 3 may face the shaft 4 in the radial direction (R)D, and the outer circumferential surface of the rotor 3 may be in the radial direction (R). ) To the inner circumference of the stator (2).

The rotor 3 may be composed of a combination of a plurality of members, and may include a rotor core 31 and at least one magnet 32.

The rotor core 31 may include a plurality of steel plates stacked on it.

A shaft through hole through which the shaft 4 passes may be formed in the center of the rotor core 31.

A magnet mounting portion may be formed on the rotor core 31. The magnet mounting portion may be formed to be recessed in the outer surface of the rotor core 31. The magnet mounting portion may be opened from one end of the rotor core 31 to the other end of the rotor core.

The magnet 32 may be mounted on the rotor core 31. The magnet 32 may be inserted and mounted in the rotor core 31, and may be integrated with the rotor core 31. A plurality of magnets 32 may be mounted on the rotor core 31.

The rotor 3 may include a pair of end plates 34 and 35 spaced apart in the longitudinal direction X of the shaft 4.

A shaft through hole through which the shaft 4 passes may be formed in the center of the end plate 34 and 35.

The shaft 4 can be connected to the rotor 3. The shaft 4 can be formed longer than the rotor 3. The shaft 4 may be supported by at least one bearing 15 and 16.

The shaft 4 may be disposed to pass through the motor covers 13 and 14. In addition, the rotor 3 and the bearings 15 and 16 may be mounted to the shaft 4 to be spaced apart.

The shaft 4 may include an end protruding out of the motor. The end of the shaft 4 protruding to the outside of the motor may be connected to a gearbox of a vehicle or may be connected to an axle of a wheel.

Hereinafter, detailed configurations of the housing 1 and the stator 2 will be described.

The stator core 6 may be formed with a tooth T and a slot S.

The coil (C) may be wound in the slot (S).

As shown in FIG. 1, the coil C includes an inner coil C1 positioned inside the stator core 6, and a coil end C2 extending from the inner coil C1 to the outside of the stator core 6 ) (C3) may be included. The inner coil C1 may be defined as a portion of the coil C that is received in the slot S and protected by the stator core 6. The coil ends C2 and C3 are portions of the coil C other than the inner coil C1, and may be defined as a portion located outside the stator core 6.

The motor of this embodiment can be configured to quickly heat the coil (C).

The stator 2, in particular, the stator core 6 may have cooling channels P1, P2, P3 through which a cooling fluid (F, or coolant, hereinafter referred to as a cooling fluid) such as oil or incompressible refrigerant can pass. have.

It is preferable that the cooling channels P1, P2, and P3 are formed in a position close to the inner coil C1 of the stator core 6. The cooling channels P1, P2, and P3 may be formed to be partitioned from the slot S in a portion of the stator core 6 located around the inner coil C1 (hereinafter, a peripheral portion of the inner coil).

When the motor is operated, the heat of the inner coil C1 can be transferred to the inner coil periphery, and the cooling fluid F passes from the inner coil C1 to the inner coil periphery while passing through the cooling channels P1, P2, P3. It can absorb heat transferred.

Meanwhile, the coil ends C2 and C3 may be directly cooled by the cooling fluid F sprayed from the outer flow path 18 to be described later.

The motor may include an inlet passage 17 provided in the housing 1 and into which the cooling fluid F flows. The inlet flow path 17 may be composed of an opening formed to be open to the housing 1, and may be formed inside a separate hollow body 22 disposed in the opening formed in the housing 1. When the inlet flow path 17 is disposed inside the hollow body 22, the housing 1 may include a motor housing 12 having an opening and a hollow body 22 disposed at the opening.

The motor may include an outer flow path 18 for injecting a pair of coil ends C2 and C3 with the cooling fluid F introduced into the inlet flow path 17. The outer flow path 18 may be formed in the housing 1.

The motor housing 12 may be composed of a combination of a plurality of members, and the outer flow path 18 through which the cooling fluid F flowing in the inlet flow path 17 can pass is a plurality of members constituting the motor housing 12 It can be formed between.

The motor may include a separate flow path body 122 disposed in the motor housing 12, and the outer flow path 18 may be formed inside the flow path body 23. In this case, the housing 1 may include a motor housing 12 and a flow path body 23.

A supply hole 24 (refer to FIG. 2) through which the cooling fluid F can be supplied to the supply channel P3 of the stator core 6 may be formed in the housing 1.

At least one of the inlet flow path 17 and the outer flow path 18 may be in communication with the supply channel P3 of the stator core 6, and in this case, the inlet flow path 17 or the outer flow path 18 is a supply channel ( It may include a supply hole 24 for supplying the cooling fluid (F) to P3). This supply hole 24 may be formed in the inner circumference of the housing 1, in particular, the motor housing 12.

The outer passage 18 may include a first outer passage 19, a second outer passage 20, and a connecting passage 21.

The first outer flow path 19 is formed in an arc shape, and a plurality of injection holes 19 ′ toward any one C2 of the pair of coil ends C2 and C3 may be spaced apart in the circumferential direction. The first outer flow path 19 may be orthogonal to the connecting flow path 21.

The second outer flow path 20 is formed in an arc shape, and a plurality of injection holes 20 ′ toward the other one C3 of the pair of coil ends C2 and C3 may be spaced apart in the circumferential direction. The second outer flow path 20 may be orthogonal to the connecting flow path 21.

The connecting passage 21 may connect the first outer passage 19 and the second outer passage 20 and communicate with the inlet passage 17. The connecting passage 21 may be formed long in the axial direction (L). The connecting passage 21 may guide the cooling fluid so that the cooling fluid flowing in the inlet passage 17 is dispersed into the first outer passage 19 and the second outer passage 20. One end of the connecting passage 21 may be connected to the center of the first outer passage 19, and the other end of the connecting passage 21 may be connected to the center of the second outer passage 20.

The cooling fluid (F) flowing into the inlet flow path 17 can be directly sprayed to the coil ends (C2) (C3) after passing through the outer flow path (18), and directly cools the coil ends (C2) (C3). After that, it may fall into the lower part of the housing 1.

Meanwhile, the cooling fluid F flowing into the inlet flow path 17 absorbs heat from the coil C while passing through the cooling channels P1, P2, P3 formed in the stator core 6, and then the stator core 6 After being discharged to the outside of the housing 1, it may fall into the inner and lower portions of the housing 1.

The stator core 6 includes a first stator core 60; A second stator core 70; It may include a cooling fluid guide (80).

A plurality of first cooling channels P1 may be formed in the first stator core 60. Each of the plurality of first cooling channels P1 may be formed to penetrate the first stator core 60 in the axial direction. The plurality of first cooling channels P1 may be formed in the first stator core 60 to be spaced apart from each other in the circumferential direction.

A plurality of second cooling channels P2 may be formed in the second stator core 70. Each of the plurality of second cooling channels P2 may be formed to penetrate the second stator core 70 in the axial direction L. The plurality of second cooling channels P2 may be formed in the second stator core 70 to be spaced apart from each other in the circumferential direction.

The second stator core 70 may be spaced apart from the first stator core 60. The second stator core 70 may be spaced apart from the first stator core 60 in the axial direction (L).

The cooling fluid guide 80 may be disposed between the first stator core 60 and the second stator core 70. The cooling fluid guide 80 may form a supply channel P3 through which the cooling fluid F passes between the first stator core 60 and the second stator core 70. The supply channel P3 may communicate with the first cooling channel P1 and the second cooling channel P2. The supply channel P3 may guide the cooling fluid F to the first cooling channel P1 and the second cooling channel P2.

The cross-sectional area of the supply channel P3 may be larger than the total cross-sectional area of the plurality of first cooling channels P1 and the total cross-sectional area of the plurality of second cooling channels P2, respectively. Further, the cross-sectional area of the supply channel P3 may be greater than the sum of the total cross-sectional areas of the plurality of first cooling channels P1 and the total cross-sectional areas of the plurality of second cooling channels P2.

Each of the plurality of first cooling channels P1 and the plurality of second cooling channels P2 may be closer to the slot S than the outer circumference 7 of the stator core 6.

Each of the plurality of first cooling channels P1 and the plurality of second cooling channels P2 may be spaced apart from the slot S in the circumferential direction R. Each of the plurality of first cooling channels P1 may be formed on the teeth T of the first stator core 60, and each of the plurality of second cooling channels P2 may be formed on the teeth T of the second stator core 70. Can be formed.

The plurality of first cooling channels P1 or the plurality of second cooling channels P2 may be opened toward between adjacent end coils among the coils C.

In this case, the cooling fluid F may absorb heat transferred from the inner coil C1 to the teeth T while passing through the plurality of first cooling channels P1 or the plurality of second cooling channels P2. Meanwhile, some of the cooling fluid (F) discharged to the outside of the stator core 6 through the plurality of first cooling channels (P1) or the plurality of second cooling channels (P2) contacts the coil ends (C2) (C3). It is possible to further cool the coil ends (C2) (C3).

Each of the first stator core 60 and the second stator core 70 has an inner region IA in which a tooth T and a slot S are formed, and an outer region in which the tooth T and the slot S are not formed. (OA) may be included. The outer area OA may be a back yoke connecting a plurality of teeth T, and the inner area IA may be an area located inside the back yoke.

The supply channel P3 is a first channel P31 opened in the radial direction R of the stator 2, and a second channel P32 communicating with the first channel P31 and facing the outer region in the axial direction. It may include.

The first channel P31 may be formed to allow the cooling fluid F to flow into the supply channel P3, and may be defined as an inlet of the supply channel P3.

The second channel P32 may be a channel through which the cooling fluid F passes to be distributed to the plurality of first cooling channels P1 and the plurality of second cooling channels P2, and the overall cross-sectional shape is a ring shape. I can.

The supply channel P3 may further include a third channel P33 communicating with the second channel P32 and facing each of the first cooling channel P1 and the second cooling channel P2.

Each of the first cooling channel P1 and the second cooling channel P2 may communicate with the third channel P33 in the axial direction L.

The third channel P33 may be opened toward the second channel P32 in the radial direction R, and open toward the first cooling channel P1 and the second cooling channel P2 in the axial direction Y. Can be. The third channel P33 may be a slit opened in three directions.

The cooling fluid guide 80 faces the outer guide 82 with one side open in the radial direction R, and the teeth T and the axial direction L of each of the first and second stator cores 70 It may include an inner tooth (86).

The outer guide 82 may be formed in an arc shape. The first channel P31 may be formed between one end 83 and the other end 83 of the outer guide 80.

The second channel P32 may be formed between the outer guide 82 and the inner tooth 86 in the radial direction R of the stator 2.

The inner teeth 86 may correspond 1:1 to the teeth T of the first stator core 60 and the second stator core 70, and may have similar or identical shapes or sizes.

A channel open toward the axial direction L and the outer guide 82 may be formed in the inner tooth 86, and this channel may be defined as a third channel P33. The third channel P33 may face the inner circumference of the outer guide 82 in the radial direction R to the inner tooth 86, and may communicate with the second channel P32 in the radial direction R. , The cooling fluid F of the second channel P32 may flow in the radial direction of the stator 2 and flow into the third channel P33.

The third channel P33 may be located between the first cooling channel P1 and the second cooling channel P2 in the axial direction L, and flows from the second channel P32 to the third channel P33. The cooled cooling fluid may flow in the axial direction L in the third channel P33 and may be distributed to the first cooling channel P1 and the second cooling channel P2.

The cooling channels P1, P2, and P3 as described above may be in the order of the first channel P31, the second channel P32, and the third channel P33 in the radial direction R, and the first channel is The cooling channel P1, the third channel P33, and the second cooling channel P2 may be in the order. The cooling channels P1, P2, and P3 of the stator core P33 may have a'ㅗ' shape.

That is, the cooling fluid F flows in the radial direction R while sequentially passing through the first channel P31, the second channel P32, and the third channel P33, as shown in FIG. 2, After being dispersed in directions opposite to each other in the third channel P33, it may flow in the axial direction L while passing through the first cooling channel P1 and the second cooling channel P2.

7 is a cross-sectional view illustrating a cooling channel of a stator according to another embodiment of the present invention, and FIG. 8 is a side view of a stator according to another embodiment of the present invention.

The supply channel P3' of the present embodiment communicates with the first channel P31 opened in the radial direction R of the stator 2 and the first channel P31, and the outer area OA in the axial direction L A second channel P32 ′ directed to) may be included.

Each of the plurality of first cooling channels P1 ′ and the plurality of second cooling channels P2 ′ may be spaced apart from the slot S in the radial direction R. In addition, each of the plurality of first cooling channels P1 ′ and the plurality of second cooling channels P2 ′ may communicate with the second channel P2.

The cooling fluid guide 80' includes an outer guide 82 whose one side is open in the radial direction R, and the teeth T and the axial direction of each of the first stator core 60 and the second stator core 70 It may include an inner tooth 86 ′ opposite to L).

The first channel P31 of the present embodiment may be formed on the outer guide 82, as in the exemplary embodiment of the present invention, and the second channel P32 of the present exemplary embodiment is, as in the exemplary embodiment of the present invention, the outer guide ( 82) and the inner tooth 86 ′.

The third channel P33 as in the exemplary embodiment of the present invention may not be formed in the inner tooth 86 ′ of the present exemplary embodiment.

In this embodiment, the location of the first cooling channel P1' and the location of the second cooling channel P2' are different from the embodiment of the present invention, and the supply channel P3' includes a third channel P33. Since other configurations and operations other than those that do not are the same as those of the exemplary embodiment of the present invention, detailed descriptions thereof will be omitted to avoid redundant descriptions.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

1: housing 2: stator
3: rotor 4: shaft
6: stator core 60: first stator core
70: second stator core 80: cooling fluid guide
C: coil F: cooling fluid
P1: 1st cooling channel P2: 2nd cooling channel
P3: Supply channel T: Teeth
S: slot

Claims (12)

A housing;
A stator disposed inside the housing;
A rotor positioned inside the stator;
Comprising a shaft connected to the rotor,
The stator is
A stator core having teeth and slots formed thereon;
Including a coil wound in the slot,
The stator core
A first stator core through which a plurality of first cooling channels are passed in the axial direction;
A second stator core through which a plurality of second cooling channels are passed in the axial direction;
A cooling fluid guide disposed between the first stator core and the second stator core and forming a supply channel communicating with the first cooling channel and the second cooling channel between the first stator core and the second stator core,
Each of the first stator core and the second stator core
An inner region in which the teeth and slots are formed,
It includes an outer region where the teeth and slots are not formed,
The supply channel is
A first channel opened in the radial direction of the stator,
And a second channel communicating with the first channel and facing the outer region in an axial direction,
The cooling fluid guide
An outer guide formed in an arc shape, one side open in a radial direction, and the first channel formed between one end and the other end;
And an inner tooth facing each of the first stator core and the second stator core in an axial direction and spaced apart from the outer guide in a radial direction,
The second channel is a motor formed between the outer guide and the inner tooth in the radial direction of the stator. The method of claim 1,
Each of the plurality of first cooling channels and the plurality of second cooling channels is closer to the slot than the outer circumference of the stator core. The method of claim 1,
Each of the plurality of first cooling channels and the plurality of second cooling channels is spaced apart from a slot in a circumferential direction. The method of claim 1,
Each of the plurality of first cooling channels and the plurality of second cooling channels is spaced apart from the slot in a radial direction. The method of claim 1,
The cross-sectional area of the supply channel is larger than the sum of the cross-sectional areas of the plurality of first cooling channels and the cross-sectional area of the plurality of second cooling channels. delete The method of claim 1,
The supply channel is
The motor further comprising a third channel communicating with the second channel and facing each of the first cooling channel and the second cooling channel. The method of claim 1,
Each of the plurality of first cooling channels and the plurality of second cooling channels is in communication with the second channel. delete The method of claim 1,
A motor having a third channel opened toward the outer guide and an axial direction in the inner tooth. The method of claim 1,
An inlet flow path provided in the housing;
It includes an outer flow path for injecting a pair of coil ends of the cooling fluid introduced into the inlet flow path,
At least one of the inlet flow path and the outer flow path is in communication with the supply channel. The method of claim 1,
An inlet flow path provided in the housing;
It includes an outer flow path for injecting a pair of coil ends of the cooling fluid introduced into the inlet flow path,
The outer flow path is
A first outer flow path formed in an arc shape and in which a plurality of injection holes toward any one of the pair of coil ends are spaced apart in a circumferential direction,
A second outer flow path formed in an arc shape and in which a plurality of injection holes facing the other of the pair of coil ends are spaced apart in a circumferential direction,
A motor comprising a connecting flow path connecting the first outer flow path and the second outer flow path and communicating with the inlet flow path.

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