Motor

Abstract

The utility model relates to an electric machine. The motor comprises a motor shell and a stator core. The motor shell is provided with a liquid inlet used for inputting cooling liquid. A stator core is packaged in the motor shell, two axial ends of the stator core are sealed with the motor shell, and a gap is reserved between the circumferential surface of the stator core and the motor shell. The stator iron core comprises a radial channel extending in the radial direction, a first axial channel connected with the radial channel and penetrating to the end face of one end of the stator iron core in the axial direction, and a second axial channel connected with the radial channel and penetrating to the end face of the other end of the stator iron core in the axial direction. And the radial channel is communicated with the liquid inlet through the interval. The stator core is good in heat dissipation and uniform in heat dissipation.

Description

Technical Field

[0001] This application relates to the field of motor stator cooling technology, and more specifically, to a motor. Background Technology

[0002] Motors generate a lot of heat during continuous operation. If the motor temperature is too high, it will affect the reliable operation and performance of the motor. In order to maintain the normal operation of the motor, a cooling structure is generally designed on the motor to remove the heat generated during the operation.

[0003] Currently, most motors used in pure electric vehicles are water-cooled, meaning that flow channels are machined into the motor housing to allow cooling water to circulate within these channels and carry away the heat generated during motor operation. However, because the cooling water cannot directly contact the heat source (stator or rotor), the cooling effect is generally limited. Furthermore, reserving flow channels in the motor housing increases the motor's size and manufacturing costs. Summary of the Invention

[0004] This application provides an electric motor that has good heat dissipation effect and uniform heat dissipation.

[0005] An electric motor, comprising:

[0006] The motor housing is equipped with an inlet for introducing coolant;

[0007] A stator core is encapsulated within the motor housing. The stator core is sealed to the motor housing at both ends in the axial direction. A pre-reserved gap is also left between the circumferential surface of the stator core and the motor housing. The stator core includes a radially extending radial channel, a first axial channel connected to the radial channel and extending axially to one end face of the stator core, and a second axial channel connected to the radial channel and extending axially to the other end face of the stator core. The radial channel communicates with the liquid inlet through the gap.

[0008] Optionally, the stator core includes an annular stator yoke and a plurality of stator slots formed on the rotor side of the stator yoke, wherein the radial distance between the first axial channel and the bottom of the stator slot is less than the radial distance between the first axial channel and the outer circumferential surface of the stator yoke, and / or, the radial distance between the second axial channel and the bottom of the stator slot is less than the radial distance between the second axial channel and the outer circumferential surface of the stator yoke.

[0009] Optionally, the motor further includes a stator winding installed in the stator slot, wherein the liquid outlet of the first axial channel formed on the end face of the stator core is opposite to the end of the stator winding, and / or the liquid outlet of the second axial channel formed on the end face of the stator core is opposite to the end of the stator winding.

[0010] Optionally, at least one of the first axial channel and the second axial channel is configured as a variable cross-section channel, the variable cross-section channel including sub-channel I and sub-channel II, the flow area of ​​sub-channel I is larger than the flow area of ​​sub-channel II, sub-channel I connects the radial channel and sub-channel II, and sub-channel II extends to the end face of the stator core.

[0011] Optionally, multiple radial channels are provided and distributed circumferentially along the stator yoke, and multiple first axial channels and multiple second axial channels are provided, each corresponding to and connected to one of the radial channels.

[0012] Optionally, the stator core includes a first lamination, a second lamination, and a third lamination, wherein the second lamination is provided on one side of the first lamination and the third lamination is provided on the other side of the first lamination, the radial channel is formed in the first lamination, the first axial channel is formed in the second lamination, and the second axial channel is formed in the third lamination.

[0013] Optionally, the second stack and the third stack are configured as the same stack.

[0014] Optionally, the stator core further includes a fourth lamination, which is disposed on the side of the second lamination facing away from the first lamination. The first axial channel includes a sub-channel I and a sub-channel II. The flow area of ​​the sub-channel I is larger than the flow area of ​​the sub-channel II. The sub-channel I is formed in the second lamination, and the sub-channel II is formed in the fourth lamination. One side surface of the fourth lamination is formed as the end face of one end of the stator core.

[0015] Optionally, the stator core further includes a fifth lamination, which is disposed on the side of the third lamination facing away from the first lamination. The second axial channel includes sub-channel III and sub-channel IV. The flow area of ​​sub-channel III is larger than that of sub-channel IV. Sub-channel III is formed on the third lamination, and sub-channel IV is formed on the fifth lamination. One side surface of the fifth lamination is formed as the end face of one end of the stator core.

[0016] Optionally, the fourth stack and the fifth stack are configured to be the same stack.

[0017] This application provides a motor in which the liquid inlet is connected to a radial channel via a spacer, and further connected to a first axial channel and a second axial channel. This allows the stator core to contact the coolant both inside and outside, improving heat dissipation. Furthermore, the first and second axial channels are arranged in parallel, allowing the coolant to be transported to both ends of the stator core along the axial direction, resulting in a smaller temperature difference between the two ends of the stator core and more uniform heat dissipation. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of an electric motor shown in an exemplary embodiment of this application;

[0019] Figure 2 yes Figure 1 An enlarged view of a partial sectional view of the motor shown in the image;

[0020] Figure 3 This is a schematic diagram of a stator core shown in an exemplary embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the first stack of plates;

[0022] Figure 5 This is a schematic diagram of the second and third laminations;

[0023] Figure 6 This is a schematic diagram of the fourth and fifth laminae;

[0024] Figure 7 This is a schematic diagram of the first retaining ring.

[0025] Explanation of reference numerals in the attached figures:

[0026] Motor 100; Motor housing 10; Stator core 20; Stator winding 28; Liquid inlet 101; Spacing 102; Radial channel 201; First axial channel 202; Second axial channel 203; Stator yoke 204; Stator slot 205; Slot bottom 2050; Outer circumferential surface 206; First lamination 21; Second lamination 22; Third lamination 23; Fourth lamination 24; Fifth lamination 25; First through hole 220; Second through hole 230; Third through hole 240; Fourth through hole 250. Detailed Implementation

[0027] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0028] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0029] Please refer to Figure 1 , Figure 1 This is a cross-sectional view of a motor 100 shown as an exemplary embodiment of this application.

[0030] This application provides an electric motor 100, which includes a motor housing 10 and a stator core 20 encapsulated within the motor housing 10. The motor 100 is an external stator motor. The motor 100 also includes a stator winding 28 installed in the stator slots of the stator core 20, with both ends of the stator winding 28 extending out from both ends of the stator core 20 along its axial direction.

[0031] The motor housing 10 is provided with a coolant inlet 101 for inputting coolant, and there may be one or more inlets 101. In this embodiment, there are two inlets 101, which are respectively located at both ends of the stator core 20 along the axial direction. Two inlets 101 can increase the coolant flow rate and improve cooling efficiency. The coolant includes, but is not limited to, oil.

[0032] The stator core 20 is sealed to the motor housing 10 at both ends in the axial direction. For example, the gap between the left end of the stator core 20 and the motor housing 10 can be sealed by the first retaining ring 30, and the gap between the right end of the stator core 20 and the motor housing 10 can be sealed by the second retaining ring 40. A gap 102 is also reserved between the circumferential surface of the stator core 20 and the motor housing 10, and this gap 102 is connected to the liquid inlet 101.

[0033] Please refer to Figure 2 , Figure 2 This is an enlarged view of part of the structure of motor 100.

[0034] The stator core 20 includes a radial channel 201 extending radially, a first axial channel 202 connected to the radial channel 201 and extending axially to one end face of the stator core 20, and a second axial channel 203 connected to the radial channel 201 and extending axially to the other end face of the stator core 20. The radial channel 201 is connected to the liquid inlet 101 through a spacer 102. Figure 2 The arrows in the diagram indicate the direction of coolant flow.

[0035] As described above, the inlet 101 is connected to the radial channel 201 via the spacer 102, and further connected to the first axial channel 202 and the second axial channel 203. This allows the stator core 20 to contact the coolant both inside and outside, improving heat dissipation. Furthermore, the first axial channel 202 and the second axial channel 203 are arranged in parallel, allowing the coolant to be transported to both ends of the stator core 20 along the axial direction, resulting in a smaller temperature difference between the two ends of the stator core 20 and more uniform heat dissipation.

[0036] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the stator core 20.

[0037] The stator core 20 includes an annular stator yoke 204 and a plurality of stator slots 205 formed on the rotor side of the stator yoke 204. The stator yoke 204 has an annular hollow structure, and a rotor (not shown) can be installed in the hollow part. The rotor is coaxial with the stator core 20.

[0038] In one embodiment, the radial distance between the first axial channel 202 and the bottom 2050 of the stator slot 205 is less than the radial distance between the first axial channel 202 and the outer circumferential surface 206 of the stator yoke 204. That is, the first axial channel 202 is closer to the bottom 2050 of the slot, and therefore closer to the stator winding 28 installed in the stator slot 205. Since the stator winding 28 is the main heat source, the proximity of the first axial channel 202 to the stator slot 205 improves heat dissipation.

[0039] In one embodiment, the radial distance between the second axial channel 203 and the bottom 2050 of the stator slot 205 can be set to be less than the radial distance between the second axial channel 203 and the outer circumferential surface 206 of the stator yoke 204 to achieve the same technical effect, which will not be elaborated here.

[0040] Please refer to this again. Figure 2 In one embodiment, a first axial channel 202 is formed at the outlet of the stator core 20, which is directly opposite the end of the stator winding 28. This allows coolant to be sprayed onto the end of the stator winding 28 through the first axial channel 202, cooling one end of the stator winding 28. Similarly, a second axial channel 203 is formed at the outlet of the stator core 20, which can also be positioned directly opposite the end of the stator winding 28. This second axial channel 203 can also spray coolant onto the other end of the stator winding 28, cooling the other end of the stator winding 28.

[0041] In one embodiment, at least one of the first axial channel 202 and the second axial channel 203 is configured as a variable cross-section channel, which includes sub-channel I and sub-channel II, with the flow area of ​​sub-channel I being larger than that of sub-channel II. Sub-channel I connects the radial channel 201 and sub-channel II, and sub-channel II extends to the end face of the stator core 20. With this configuration, under constant flow conditions, the coolant in sub-channel II has a high flow velocity and high pressure, ensuring that the coolant can be reliably sprayed onto the end of the stator winding 28. Sub-channel I and sub-channel II can be implemented by opening holes of different sizes.

[0042] To achieve uniform cooling of all parts of the stator core 20, multiple radial channels 201 are provided, which are distributed circumferentially along the stator yoke 204. Multiple first axial channels 202 and second axial channels 203 are also provided, each corresponding to and connected to one of the radial channels 201. This creates multiple parallel cooling channels, allowing multiple streams of coolant to flow through simultaneously, resulting in good cooling performance and more uniform heat dissipation from all parts of the stator core 20.

[0043] Please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the first lamination of the stator core 20. Figure 5 This is a schematic diagram of the second lamination 22 and the third lamination 23 of the stator core 20.

[0044] In one embodiment, the stator core 20 includes a first lamination 21, a second lamination 22, and a third lamination 23 stacked together. The second lamination 22 is provided on one side of the thickness direction of the first lamination 21, and the third lamination 23 is provided on the other side of the thickness direction of the first lamination 21. A radial channel 201 is formed in the first lamination 21, a first axial channel 202 is formed in the second lamination 22, and a second axial channel 203 is formed in the third lamination 23.

[0045] Specifically, the yoke of the first lamination 21 has a radial channel 201, the opening of which faces away from the center of the first lamination 21. Figure 4 In the illustrated embodiment, the first stack 21 forms multiple radial channels 201, which are evenly spaced and distributed along the circumference of the first stack 21. One or more first stacks 21 can be provided, and multiple first stacks 21 can form radial channels 201 with a larger volume.

[0046] The yoke of the second lamination 22 has a first through hole 220. Multiple second laminations 22 are provided, and the first through holes 220 of each second lamination 22 are interconnected to form a first axial channel 202. The yoke of the third lamination 23 has a second through hole 230. Multiple third laminations 23 are provided, and the second through holes 230 of each third lamination 23 are interconnected to form a second axial channel 203. In this embodiment, the second lamination 22 and the third lamination 23 use the same type of lamination, which reduces the number of lamination types and lowers costs.

[0047] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the fourth lamination 24 and the fifth lamination 25 of the stator core 20.

[0048] In one embodiment, the stator core 20 further includes a fourth lamination 24, which is disposed on the side of the second lamination 22 facing away from the first lamination 21. The first axial channel 202 includes a sub-channel I and a sub-channel II. The flow area of ​​the sub-channel I is larger than that of the sub-channel II. The sub-channel I is formed on the second lamination 22, and the sub-channel II is formed on the fourth lamination 24. The surface of the fourth lamination 24 is formed as the end face of one end of the stator core 20.

[0049] Specifically, the fourth lamination 24 is provided with a third through hole 240, the diameter of which is smaller than the diameter of the first through hole 220. This allows the formation of sub-channels I and II with unequal flow areas, simplifying the implementation. The number of fourth laminations 24 is unlimited; one or more laminations can be used. Sub-channel II has a small flow area, high flow velocity, and high internal coolant pressure, allowing for more reliable spraying to the end of the stator winding 28.

[0050] Please continue to refer to this. Figure 6 The stator core 20 also includes a fifth lamination 25, which is disposed on the side of the third lamination 23 facing away from the first lamination 21. The second axial channel 203 includes a sub-channel III and a sub-channel IV. The flow area of ​​the sub-channel III is larger than that of the sub-channel IV. The sub-channel III is formed on the third lamination 23, and the sub-channel IV is formed on the fifth lamination 25. The surface of the fifth lamination 25 is formed as the end face of one end of the stator core 20.

[0051] Specifically, the fifth lamination 25 is provided with a fourth through hole 250, the diameter of which is smaller than the diameter of the second through hole 230. This allows the formation of sub-channels III and IV with unequal flow areas, simplifying the implementation. The number of fifth laminations 25 is unlimited; one or more laminations can be used. Sub-channel IV has a small flow area, high flow velocity, and high internal coolant pressure, allowing for more reliable spraying to the end of the stator winding 28.

[0052] In this embodiment, the fourth stack 24 and the fifth stack 25 are set to be the same stack, which can reduce the types of stacks and reduce costs.

[0053] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the first retaining ring 30.

[0054] The first retaining ring 30 is positioned at one axial end of the stator core 20, sealing the end face of the stator core 20 with the motor housing 10 and ensuring the flow of coolant between the outer circumferential surfaces of the motor housing 10 and the stator core 20. The first retaining ring 30 includes an annular frame 31 and a sealing ring 32. The sealing ring 32 is embedded in a groove in the annular frame 31. The annular frame 31 and the sealing ring 32 can be integrally molded by secondary injection molding or connected by assembly. The annular frame 31 can be a plastic frame. The first retaining ring 30 is clamped between the end faces of the motor housing 10 and the stator core 20. The second retaining ring 40 can be configured similarly to the first retaining ring 30, and will not be described further here.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An electric motor, characterized in that, include: The motor housing is equipped with an inlet for introducing coolant; A stator core is encapsulated within the motor housing. The stator core is sealed to the motor housing at both ends in the axial direction. A pre-reserved gap is also left between the circumferential surface of the stator core and the motor housing. The stator core includes a radially extending radial channel, a first axial channel connected to the radial channel and extending axially to one end face of the stator core, and a second axial channel connected to the radial channel and extending axially to the other end face of the stator core. The radial channel communicates with the liquid inlet through the gap.

2. The motor according to claim 1, characterized in that, The stator core includes an annular stator yoke and a plurality of stator slots formed on the rotor side of the stator yoke. The radial distance between the first axial channel and the bottom of the stator slot is less than the radial distance between the first axial channel and the outer circumferential surface of the stator yoke, and / or, the radial distance between the second axial channel and the bottom of the stator slot is less than the radial distance between the second axial channel and the outer circumferential surface of the stator yoke.

3. The motor according to claim 2, characterized in that, The motor further includes a stator winding installed in the stator slot, wherein the liquid outlet of the first axial channel formed on the end face of the stator core is opposite to the end of the stator winding, and / or the liquid outlet of the second axial channel formed on the end face of the stator core is opposite to the end of the stator winding.

4. The motor according to claim 1, characterized in that, At least one of the first axial channel and the second axial channel is configured as a variable cross-section channel. The variable cross-section channel includes sub-channel I and sub-channel II. The flow area of ​​sub-channel I is larger than the flow area of ​​sub-channel II. Sub-channel I connects the radial channel and sub-channel II. Sub-channel II extends to the end face of the stator core.

5. The motor according to claim 1, characterized in that, The radial channels are provided in multiples and are distributed at intervals along the circumference of the stator core. The first axial channel and the second axial channel are provided in multiples and are respectively connected to the radial channels one by one.

6. The motor according to claim 1, characterized in that, The stator core includes a first lamination, a second lamination, and a third lamination. The second lamination is located on one side of the first lamination, and the third lamination is located on the other side of the first lamination. The radial channel is formed in the first lamination, the first axial channel is formed in the second lamination, and the second axial channel is formed in the third lamination.

7. The motor according to claim 6, characterized in that, The second stack and the third stack are configured as the same stack.

8. The motor according to claim 6, characterized in that, The stator core further includes a fourth lamination, which is disposed on the side of the second lamination facing away from the first lamination. The first axial channel includes a sub-channel I and a sub-channel II. The flow area of ​​the sub-channel I is larger than the flow area of ​​the sub-channel II. The sub-channel I is formed in the second lamination, and the sub-channel II is formed in the fourth lamination. One side surface of the fourth lamination is formed as the end face of one end of the stator core.

9. The motor according to claim 8, characterized in that, The stator core further includes a fifth lamination, which is disposed on the side of the third lamination facing away from the first lamination. The second axial channel includes sub-channel III and sub-channel IV. The flow area of ​​sub-channel III is larger than that of sub-channel IV. Sub-channel III is formed on the third lamination, and sub-channel IV is formed on the fifth lamination. One side surface of the fifth lamination is formed as the end face of one end of the stator core.

10. The motor according to claim 9, characterized in that, The fourth stack and the fifth stack are configured to be the same stack.

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