A motor stator

Abstract

This invention relates to a motor stator, comprising a first core lamination, a second core lamination, a third core lamination, and a fourth core lamination. The first core lamination has an oil hole group and a fourth oil hole; the second core lamination has a fifth oil hole, a sixth oil hole, and a long oil hole; the third core lamination has a seventh oil hole and an eighth oil hole; and the fourth core lamination has a ninth oil hole. The outer circumferential surface of the fourth core lamination and the seventh oil hole are connected to form a main coolant channel; the long oil hole, the eighth oil hole, the ninth oil hole, the sixth oil hole, and the fourth oil hole are connected to form a coolant flow channel at the stator root; the fifth oil hole and the oil hole group are connected to form a coolant flow channel at the stator end; and the coolant flow channels at the stator root and stator end are connected to the main coolant channel. Compared with the prior art, this invention has the advantages of forming coolant flow channels at the stator root and stator end, achieving cooling of the stator winding root and stator winding ends, and improving the cooling efficiency of the motor.

Description

Technical Field

[0001] This invention relates to electric motors for new energy vehicles, and more particularly to a motor stator. Background Technology

[0002] As the power of motors in new energy vehicles gradually increases, the requirements for heat dissipation are becoming increasingly stringent, and the design requirements for motor heat dissipation are also becoming increasingly stringent. During operation, the stator core and windings of the motor experience high losses, especially the losses in the stator teeth and slot windings, which can cause excessively high temperatures and degrade motor performance.

[0003] A search revealed that application publication number CN113937919A discloses a motor stator. This stator cooling structure includes a stator core, which comprises a stator yoke and stator teeth. Stator slots are formed on adjacent stator teeth, and stator windings are wound on the stator teeth. The stator windings include end windings located at both ends of the stator core. Cooling channels are provided on the stator yoke, and these channels have a bent structure. The opening of the cooling channel near the end windings is located radially outward of the end windings, while the opening of the cooling channel away from the end windings communicates with the stator slots. However, this prior art cannot cool the root of the windings.

[0004] In summary, the technical problem that needs to be solved is how to design a motor stator that can cool both the ends and roots of the windings. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art in that it is impossible to cool the ends of the motor windings and to provide a motor stator.

[0006] The objective of this invention can be achieved through the following technical solutions.

[0007] According to one aspect of the present invention, a motor stator is provided, comprising a plurality of stacked first core laminations, second core laminations, third core laminations and fourth core laminations; and a plurality of third core laminations, a plurality of fourth core laminations, a plurality of third core laminations, a plurality of second core laminations and a plurality of first core laminations are arranged sequentially on both sides of the plurality of fourth core laminations.

[0008] The first iron core lamination has a circumferentially distributed group of oil holes near its edge and a fourth oil hole on its stator teeth; the second iron core lamination has a fifth oil hole near its edge and a sixth oil hole on its stator teeth, and also has a long oil hole; the third iron core lamination has a seventh oil hole near its edge and an eighth oil hole on its stator teeth; the diameter of the fourth iron core lamination is smaller than the diameter of the smallest concentric circle of the third iron core lamination passing through the seventh oil hole, the seventh oil hole connects the fifth oil hole and the long oil hole, and the stator teeth of the fourth iron core lamination have a ninth oil hole;

[0009] The outer circumferential surface of the fourth core lamination and the seventh oil hole are connected to form the main coolant channel; the long oil hole, the eighth oil hole, the ninth oil hole, the sixth oil hole and the fourth oil hole are connected to form the coolant flow channel at the root of the stator; the fifth oil hole and the group of oil holes are connected to form the coolant flow channel at the end of the stator; the coolant flow channel at the root of the stator and the coolant flow channel at the end of the stator are connected to the main coolant channel.

[0010] As a preferred technical solution, the oil hole group includes a first oil hole, a second oil hole, and a third oil hole arranged sequentially and whose distance from the center of the first iron core lamination decreases sequentially; the first oil hole, the second oil hole, and the third oil hole of the first iron core lamination form an inclined coolant flow channel; the first oil hole, the second oil hole, and the third oil hole of the first iron core lamination are evenly distributed around the circumference.

[0011] As a preferred technical solution, two adjacent sixth oil holes are arranged with a stator tooth spacing; two adjacent eighth oil holes are arranged with a stator tooth spacing; the angular distance between the first oil hole and the second oil hole, the second oil hole and the third oil hole, and the adjacent sixth oil hole is 1. , where n is the number of stator teeth.

[0012] As a preferred technical solution, the first iron core lamination has a first groove on its outer edge, the second iron core lamination has a second groove on its outer edge, and the third iron core lamination has a third groove on its outer edge. The first groove, the second groove, and the third groove are aligned circumferentially to form a first weld groove, which connects the third iron core lamination, the first iron core lamination, and the second iron core lamination near the edge.

[0013] As a preferred technical solution, two adjacent first grooves are spaced apart by one stator tooth arrangement; two adjacent second grooves are spaced apart by one stator tooth arrangement; the angular distance between adjacent first grooves is [missing information]. The angular distance between adjacent second grooves is , where n is the number of stator teeth.

[0014] As a preferred technical solution, the outer edge of the third core lamination is provided with a fourth groove, and the outer edge of the fourth core lamination is provided with a protrusion. The protrusion and the fourth groove are aligned circumferentially to form a second weld groove. The angular distance between adjacent fourth grooves and the angular distance between adjacent protrusions are both [missing information]. n is the number of stator teeth, and k is a positive integer.

[0015] As a preferred technical solution, the number of the seventh oil holes is x times the number of stator teeth, where x is a positive integer; the seventh oil holes are evenly distributed around the circumference of the third core lamination near the edge, except for the fourth groove.

[0016] As a preferred technical solution, the multiple third core laminations and multiple fourth core laminations arranged on both sides of the multiple fourth core laminations are symmetrical; the second core laminations and first core laminations arranged on both sides of the multiple fourth core laminations are angled apart. , where n is the number of stator teeth.

[0017] As a preferred technical solution, the long oil hole extends along the radial direction, and the height of one end is located at the middle of the stator teeth.

[0018] As a preferred technical solution, the stator is interference-fitted with the motor housing, and the motor housing is provided with a coolant inlet, from which the coolant flows to the outer circumferential surface of the fourth core lamination.

[0019] Compared with the prior art, the present invention has the following beneficial effects.

[0020] 1) This invention employs four types of iron core laminations to assemble the motor stator. By setting oil holes at different positions, coolant flow channels are formed on both sides of the stator root and stator end, achieving cooling of the stator winding root and stator winding ends. This ensures sufficient and uniform cooling of the stator, improving the motor's cooling efficiency. The fourth iron core lamination is arranged in the middle and on both sides, allowing for uniform circumferential distribution of coolant and ensuring even oil distribution at each injection hole. Through the iron core flow channel design, this invention introduces coolant into the stator tooth flow channels without adding other components, increasing winding cooling, and eliminates the need for additional sealing structures, thus reducing costs.

[0021] 2) The first oil hole, the second oil hole and the third oil hole of the present invention form an inclined coolant flow channel, forming a jet sprayed towards the winding end, which can accelerate the flow and circulation speed of the coolant; the jet can be achieved without sealing or oil injection ring, which greatly reduces the cost.

[0022] 3) The angular distances between the first and second oil holes, the second and third oil holes, and the adjacent sixth oil hole in this invention are all... The angular distance between adjacent first grooves is The angular distance between adjacent second grooves is The angular distance between adjacent fourth grooves and the angular distance between adjacent protrusions are both This design keeps the coolant flow channel a straight channel; straight channels have low flow resistance, high cooling efficiency, are not easily blocked, and are easy to maintain.

[0023] 4) The protrusion and the fourth groove of the present invention are aligned circumferentially, which can connect the third iron core lamination and the fourth iron core lamination to prevent the lamination from falling apart.

[0024] 5) The flow channel designed in this invention has a relatively long path in the stator, which can give full play to the heat exchange effect of the coolant under limited flow, and the utilization rate of the coolant is high. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a motor stator according to the present invention.

[0026] Figure 2 This is an exploded view of an electric motor stator according to the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of the first iron core lamination of the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of the second iron core lamination of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of the third iron core lamination of the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of the fourth iron core lamination of the present invention.

[0031] Figure 7 This is a schematic diagram showing the location where the coolant enters according to the present invention.

[0032] Figure 8 This is a schematic diagram of the coolant flow channel of the present invention.

[0033] Figure 9 This is a partial schematic diagram of the coolant flow channel of the present invention.

[0034] Figure 10 This is a second partial schematic diagram of the coolant flow channel of the present invention.

[0035] Figure 11 This is a third partial schematic diagram of the coolant flow channel of the present invention.

[0036] Figure 12 This is a schematic diagram of the structure of the first and second weld grooves of the present invention.

[0037] Figure 13 This is a schematic diagram of the long oil hole structure of the present invention.

[0038] The numbers in the diagram are as follows:

[0039] 1. First core lamination; 10. First oil hole; 11. Second oil hole; 12. Third oil hole; 13. Fourth oil hole; 14. First groove; 2. Second core lamination; 20. Fifth oil hole; 21. Sixth oil hole; 22. Second groove; 23. Long oil hole; 3. Third core lamination; 30. Seventh oil hole; 31. Eighth oil hole; 32. Third groove; 33. Fourth groove; 4. Fourth core lamination; 40. Ninth oil hole; 41. Protrusion; 50. Main coolant channel; 51. Coolant channel at the root of the stator; 52. Coolant channel at the end of the stator; 6. Stator tooth; 70. First weld groove; 71. Second weld groove. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] like Figure 1 and Figure 2 As shown ( Figure 1 (The fourth core laminations 4 on both sides are obscured and cannot be directly seen in the figure). This invention provides a motor stator, which is interference-fitted with the motor housing. It includes multiple first core laminations 1, multiple second core laminations 2, multiple third core laminations 3, and multiple fourth core laminations 4. The arrangement of the core laminations is as follows: multiple stacked fourth core laminations 4 are located in the middle, and multiple stacked third core laminations 3, multiple stacked fourth core laminations 4, multiple stacked third core laminations 3, multiple stacked second core laminations 2, and multiple stacked first core laminations 1 are arranged sequentially on both sides of the fourth core lamination 4. The arrangement of the fourth core laminations 4 in the middle and on both sides can make the coolant evenly distributed circumferentially, and make the oil volume of each oil injection hole evenly distributed; the first core laminations 1, second core laminations 2, and third core laminations 3 can prevent coolant leakage from the weld groove by rotating and combining them.

[0042] like Figure 3As shown, the first core lamination 1 has an oil hole group near its edge, and a fourth oil hole 13 is provided on the stator tooth 6 (at the root of the stator tooth 6). Multiple fourth oil holes 13 are arranged at intervals, i.e., one stator tooth 6 separates two adjacent fourth oil holes 13. The oil hole group includes a first oil hole 10, a second oil hole 11, and a third oil hole 12 arranged sequentially with decreasing radii (distances from the center of the first core lamination 1). Due to the unequal radii (distances from the center of the first core lamination 1), the first oil holes 10, second oil holes 11, and third oil holes 12 of the three first core laminations 1 form an inclined coolant flow channel. A first groove 14 is provided on the outer edge of the first core lamination 1, and the number of first grooves 14 is the same as the total number of first oil holes 10, second oil holes 11, and third oil holes 12. The angular distances between the first oil holes 10 and third oil holes 12, the first oil holes 10 and second oil holes 11, and the second oil holes 11 and third oil holes 12 are all... n is the number of stator teeth; the number of fourth oil holes 13 is The angular distance between adjacent first grooves 14 is The above-mentioned angular spacing design can form a direct flow channel. The direct flow channel has a short path and low coolant flow resistance. Under the same pump power, the direct flow channel can achieve a higher flow rate, faster heat dissipation, and is easier to manufacture and assemble. The flow channel can also be designed as a staggered flow channel. The required angular spacing for the staggered flow channel is the direct flow channel angular spacing + deviation angle. The size of the deviation angle depends on the staggered angle of the flow channels. The staggered flow channel increases the heat dissipation area, which can enhance the heat transfer intensity and make the heat dissipation more uniform.

[0043] like Figure 4 As shown, the second core lamination 2 has a fifth oil hole 20 near its edge and a sixth oil hole 21 on the stator tooth 6 (at the root of the stator tooth 6). Multiple sixth oil holes 21 are arranged at intervals, meaning that each adjacent sixth oil hole 21 is separated by a stator tooth 6. A long oil hole 23 is located in the middle of this interval, extending radially. One end of the long oil hole 23 has a radius equal to that of the fifth oil hole 20 (distance from the center of the second core lamination 2), and the other end has a radius equal to that of the sixth oil hole 21 (distance from the center of the second core lamination 2). The long oil hole 23 introduces coolant from the back of the stator core into the tooth. Figure 13 As shown, the outer diameter of the long oil hole 23 is larger than the lowest position of the seventh oil hole 30, and the inner diameter is smaller than the highest position of the eighth oil hole 31, ensuring smooth flow. To form a cooling oil channel with the oil hole group of the first iron core lamination 1, the number of fifth oil holes 20 is the same as the number of oil hole groups. The outer edge of the second iron core lamination 2 is provided with a second groove 22, and the number of second grooves 22 is the same as the number of fifth oil holes 20. The angular distance between adjacent sixth oil holes 21 is... n is the number of stator teeth; the number of sixth oil holes 21 is The angular distance between adjacent second grooves 22 is .

[0044] like Figure 5 As shown, the third core lamination 3 has a seventh oil hole 30 near its edge, and all stator teeth 6 (at the root of the stator teeth 6) have an eighth oil hole 31. The outer edge of the third core lamination 3 has a third groove 32 and a fourth groove 33. The area of ​​the fourth groove 33 is larger than that of the third groove 32. Since the positions of the seventh oil hole 30 and the fourth groove 33 overlap in the radial direction of the second core lamination 2, the position where the fourth groove 33 is located does not have a seventh oil hole 30, ensuring that the seventh oil hole 30 is not blocked during rotation. The number of seventh oil holes is x times the number of stator teeth, where x is a positive integer; the number of eighth oil holes 31 is... .

[0045] like Figure 6 As shown, the diameter of the fourth core lamination 4 is smaller than the diameter of the smallest concentric circle of the third core lamination 3 passing through the seventh oil hole 30. The diameter of the largest concentric circle of the second core lamination 2 passing through the long oil hole 23 is larger than the diameter of the fourth core lamination 4. The diameter of the largest concentric circle of the second core lamination 2 passing through the fifth oil hole 20 is larger than the diameter of the fourth core lamination 4. This size ensures that the coolant flowing to the outer circumference of the fourth core lamination 4 can flow into the seventh oil hole 30 and the long oil hole 23. A ninth oil hole 40 is provided on all the stator teeth 6 (at the root of the stator teeth 6) of the fourth core lamination 4. A protrusion 41 is provided on the outer edge of the fourth core lamination 4. The maximum radius of the protrusion 41 (distance from the center of the fourth core lamination 4) is smaller than the radius of the third core lamination 3. The number of fourth grooves 33 and protrusions 41 is the same. The number of ninth oil holes 40 is... .

[0046] like Figure 12 As shown, the first groove 14, the second groove 22, and the third groove 32 are aligned circumferentially to form a first weld groove 70, which is then welded. The number of the first groove 14 and the second groove 22 is greater than the number of the third groove 32. The fourth groove 33 and the second groove 22 are aligned circumferentially. The protrusion 41 and the fourth groove 33 are aligned circumferentially to form a second weld groove 71. To achieve the above alignment structure, the third core lamination 3 between the fourth core lamination 4 and the second core lamination 2 on both sides is divided into two parts that rotate relative to each other at a certain angle, respectively aligned with the second groove 22 and the protrusion 41. Coolant will flow through the first weld groove 70, and the combination formed by the second core lamination 2 on both sides of the first weld groove 70 prevents coolant leakage. To make the coolant flow channel more reasonable, the third core lamination 3, the fourth core lamination 4, and the third core lamination 3 on both sides of the central fourth core lamination 4 can be a symmetrical structure, with the second core lamination 2 and the first core lamination 1 on both sides offset at an angle. , where n is the number of stator teeth.

[0047] like Figure 7As shown, the coolant has a coolant inlet on the motor housing, and the coolant flows from the coolant inlet to the outer circumferential surface of the fourth iron core lamination 4 in the middle; the outer circumferential surface of the fourth iron core lamination 4 in the middle, the seventh oil hole 30, the outer circumferential surfaces of the fourth iron core laminations 4 on both sides, and the first weld groove 70 are connected to form the main coolant channel 50; the long oil hole 23 is connected to the seventh oil hole 30, as shown in the figure. Figures 8-11 As shown, the long oil hole 23, the eighth oil hole 31, the ninth oil hole 40, the eighth oil hole 31, the ninth oil hole 40, the eighth oil hole 31, the ninth oil hole 40, the eighth oil hole 31, the sixth oil hole 21, and the fourth oil hole 13 are connected in sequence to form a stator root coolant flow channel 51. The coolant flows through the stator root coolant flow channel 51 and is then sprayed out to cool the stator root. The fifth oil hole 20 is connected to the seventh oil hole 30. The fifth oil hole 20 and the oil hole group are connected to form a stator end coolant flow channel 52. The stator end coolant flow channel 52 is an inclined hole flow channel. The coolant flows in the inclined hole flow channel to form a jet, which is sprayed out to cool the stator end.

[0048] The oil hole group, fourth oil hole 13, fifth oil hole 20, sixth oil hole 21, seventh oil hole 30, eighth oil hole 31, ninth oil hole 40, first groove 14, second groove 22, third groove 32, fourth groove 33 and protrusion 41 involved in this invention are all arranged in a circumferentially even manner on the iron core lamination.

[0049] In order to improve the cooling of the stator, this invention cools the winding ends by forming a jet through openings at the ends of the stator core without adding any additional components. Openings are made in the stator teeth 6 to introduce coolant into the stator teeth 6 and spray it toward the root of the winding, thereby enhancing the cooling of the stator teeth 6 and the winding in the slot, improving the heat exchange efficiency of the motor, and thus improving the performance of the motor.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A motor stator, characterized in that, It includes multiple stacked first core laminations (1), second core laminations (2), third core laminations (3) and fourth core laminations (4); multiple third core laminations (3), multiple fourth core laminations (4), multiple third core laminations (3), multiple second core laminations (2) and multiple first core laminations (1) are arranged sequentially on both sides of the multiple fourth core laminations (4); The first core lamination (1) has a circumferentially distributed group of oil holes near its edge and a fourth oil hole (13) on the stator teeth (6); the second core lamination (2) has a fifth oil hole (20) near its edge and a sixth oil hole (21) on the stator teeth (6), and a long oil hole (23) on the second core lamination (2); the third core lamination (3) has a seventh oil hole (30) near its edge and an eighth oil hole (31) on the stator teeth (6); the diameter of the fourth core lamination (4) is smaller than the diameter of the smallest concentric circle of the third core lamination (3) passing through the seventh oil hole (30), the seventh oil hole (30) connects the fifth oil hole (20) and the long oil hole (23), and a ninth oil hole (40) is provided on the stator teeth (6) of the fourth core lamination (4); The outer circumferential surface of the fourth core lamination (4) and the seventh oil hole (30) are connected to form the main coolant channel (50); the long oil hole (23), the eighth oil hole (31), the ninth oil hole (40), the sixth oil hole (21) and the fourth oil hole (13) are connected to form the stator root coolant channel (51); the fifth oil hole (20) and the oil hole group are connected to form the stator end coolant channel (52); the stator root coolant channel (51) and the stator end coolant channel (52) are connected to the main coolant channel (50).

2. The motor stator according to claim 1, characterized in that, The oil hole group includes a first oil hole (10), a second oil hole (11), and a third oil hole (12) arranged sequentially and whose distance from the center of the first iron core lamination (1) decreases sequentially; the first oil hole (10), the second oil hole (11), and the third oil hole (12) of the first iron core lamination (1) form an inclined coolant flow channel; the first oil hole (10), the second oil hole (11), and the third oil hole (12) of the first iron core lamination (1) are evenly distributed around the circumference.

3. A motor stator according to claim 2, characterized in that, Two adjacent sixth oil holes (21) are arranged with a stator tooth (6) between them; two adjacent eighth oil holes (31) are arranged with a stator tooth (6) between them; the angular distance between the first oil hole (10) and the second oil hole (11), the second oil hole (11) and the third oil hole (12), and the adjacent sixth oil hole (21) is 1. , where n is the number of stator teeth.

4. A motor stator according to claim 1, characterized in that, The first core lamination (1) has a first groove (14) on its outer edge, the second core lamination (2) has a second groove (22) on its outer edge, and the third core lamination (3) has a third groove (32) on its outer edge. The first groove (14), the second groove (22) and the third groove (32) are aligned circumferentially to form a first weld groove (70). The first weld groove (70) connects the third core lamination (3), the first core lamination (1) and the second core lamination (2) near the edge.

5. A motor stator according to claim 4, characterized in that, Two adjacent first grooves (14) are arranged with a stator tooth (6) between them; two adjacent second grooves (22) are arranged with a stator tooth (6) between them; the angular distance between adjacent first grooves (14) is... The angular distance between adjacent second grooves (22) is , where n is the number of stator teeth.

6. A motor stator according to claim 1, characterized in that, The third core lamination (3) has a fourth groove (33) on its outer edge, and the fourth core lamination (4) has a protrusion (41) on its outer edge. The protrusion (41) and the fourth groove (33) are aligned circumferentially to form a second weld groove (71). The angular distance between adjacent fourth grooves (33) and the angular distance between adjacent protrusions (41) are both 1. n is the number of stator teeth, and k is a positive integer.

7. A motor stator according to claim 6, characterized in that, The number of the seventh oil holes (30) is x times the number of stator teeth, where x is a positive integer; the seventh oil holes (30) are evenly distributed around the circumference of the third core lamination (3) near the edge, except for the fourth groove (33).

8. A motor stator according to claim 1, characterized in that, The multiple third core laminations (3) and multiple fourth core laminations (4) arranged on both sides of the multiple fourth core laminations (4) are symmetrical; the second core laminations (2) and the first core laminations (1) arranged on both sides of the multiple fourth core laminations (4) are staggered at angles. , where n is the number of stator teeth.

9. A motor stator according to claim 1, characterized in that, The long oil hole (23) extends in the radial direction, and the height of one end is located in the middle of the stator tooth (6).

10. A motor stator according to claim 1, characterized in that, The stator is interference-fitted with the motor housing, and the motor housing is provided with a coolant inlet. The coolant flows from the coolant inlet to the outer circumference of the fourth core lamination (4).

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