Stator oil duct structure of oil-cooled motor

Abstract

The utility model discloses a stator oil duct structure of an oil-cooled motor, which is arranged on the outer circumference of a stator core and comprises a circumferential cut-off part I, a circumferential cut-off part II, a pair of longitudinal cut-off parts, a circumferential oil guide groove I, a circumferential oil guide groove II, a plurality of longitudinal oil grooves I and a plurality of longitudinal oil grooves II, one end of each first longitudinal oil groove is communicated with the first circumferential oil guide groove, and the other end of each first longitudinal oil groove flows to the crown end; one end of each second longitudinal oil groove communicates with the corresponding second circumferential oil guide groove, and the other end of each second longitudinal oil groove flows to the welding end; wherein the number of the first longitudinal oil grooves is larger than that of the second longitudinal oil grooves, so that more cooling oil can be distributed to the welding end, and sufficient heat exchange of the cooling oil is guaranteed. Through the structure, the oil distribution quantity at the two ends can be adjusted, the flow resistance can be reduced, sufficient heat exchange at the two ends can be ensured, the temperature is lower than the limited temperature, the heat dissipation performance and the service life of the motor are improved, and further development of the motor technology is promoted.

Description

Technical Field

[0001] The utility model relates to the field of new energy automobile motor manufacturing, and in particular to an oil channel structure of an oil-cooled motor stator. Background Art

[0002] As a core component of modern industry, motors are widely used in various mechanical equipment. Their performance stability and service life are directly related to the operating efficiency of the entire system. During the operation of the motor, the heat generated during the conversion or transfer of electric energy will have a serious impact on the normal operation of the motor if it cannot be effectively dissipated, and may even cause damage to the motor. Therefore, the heat dissipation performance of the motor has always been an important research direction in the field of motor design.

[0003] Traditional motor cooling methods mainly include air cooling and water cooling. However, air cooling has low heat dissipation efficiency, especially in high temperature environments, and it is difficult to meet the heat dissipation needs of the motor; while water cooling has better heat dissipation effect, it has high requirements for water channel sealing and corrosion resistance, and has problems such as long transfer path and low heat dissipation efficiency. Especially in the high-temperature part of the motor, such as the winding end, due to the existence of thermal resistance, the heat transfer path to the water-cooled casing is long, resulting in temperature accumulation and the formation of local hot spots, thus affecting the overall performance of the motor.

[0004] In order to overcome the shortcomings of traditional heat dissipation methods, oil cooling technology has gradually received attention in recent years. Oil-cooled motors absorb and remove the heat generated by the motor through the circulation of oil, thereby achieving effective heat dissipation. Among them, the motor housing oil channel is a key part of oil cooling technology, and its design directly affects the heat dissipation effect of the motor.

[0005] However, the oil-cooled motors currently on the market still have certain limitations in the design of the casing oil channel. For example, in the existing technical solution, under a certain amount of oil supplied by the casing oil channel, the stator core only has longitudinal oil grooves and the number and area of ​​the oil grooves at the welding end and the crown end are equal, and the oil volume at the welding end and the crown end of the stator is basically the same (such as Figure 3 ). In general, the loss of the crown end is lower than that of the welding end, and the heat dissipation of the crown end is better than that of the welding end. When the oil volume of the two is equal, the temperature of the crown end is lower and the temperature of the welding end is higher. In order to ensure that the temperature of the welding end is lower than the limit temperature, the oil volume needs to be increased, but this will cause too much oil on the crown end, resulting in insufficient heat exchange.

[0006] Therefore, how to design an oil channel for a motor casing with a reasonable structure, good heat dissipation effect, good sealing and low processing cost has become an urgent problem to be solved in the current motor design field. Summary of the invention

[0007] In order to overcome the defects of the prior art, the purpose of the utility model is to provide an oil-cooled motor stator oil channel structure to solve the problems of unreasonable casing oil channel structure, uneven heat dissipation and poor heat dissipation effect in the prior art solution.

[0008] To this end, the utility model proposes an oil channel structure of an oil-cooled motor stator, comprising a circumferential truncation portion 1, a circumferential truncation portion 2, a pair of longitudinal truncation portions, a plurality of longitudinal oil grooves 1 and a plurality of longitudinal oil grooves 2; a plurality of the longitudinal oil grooves 1 are located on one side of the circumferential truncation portion 1, and a plurality of ends of the longitudinal oil grooves 1 are connected with an end of the stator core close to the crown end; a plurality of the longitudinal oil grooves 2 are located on one side of the circumferential truncation portion 2, and a plurality of ends of the longitudinal oil grooves 2 are connected with an end of the stator core close to the welding end; wherein, the circumferential truncation portion 1, the circumferential truncation portion 2 and a pair of longitudinal truncation portions are connected in sequence to form a "Z"-shaped oil distribution structure; and the number of the longitudinal oil grooves 1 is greater than the number of the longitudinal oil grooves 2, so that the welding end can be distributed with more cooling oil to ensure sufficient heat exchange of the cooling oil.

[0009] As a preferred technical solution of the present invention, a circumferential oil guide groove is provided on the inner side of the circumferential truncation portion, and one end of each of the plurality of longitudinal oil grooves is respectively connected to the circumferential oil guide groove.

[0010] As a preferred technical solution of the present invention, a circumferential oil guide groove 2 is provided inside the circumferential truncation portion 2, and one ends of a plurality of the longitudinal oil grooves 2 are respectively connected to the circumferential oil guide groove 2.

[0011] As a preferred technical solution of the present invention, the center angle R of the arc where the circumferential oil guide groove 1 is located is greater than the center angle R of the arc where the circumferential oil guide groove 2 is located.

[0012] As a preferred technical solution of the present invention, the cooling oil in a plurality of longitudinal oil grooves flows toward the crown end respectively.

[0013] As a preferred technical solution of the present invention, the cooling oil in the plurality of longitudinal oil grooves 2 flows toward the welding ends respectively.

[0014] As a preferred technical solution of the present invention, the stator oil channel structure is arranged on the outer circumference of the stator core.

[0015] The utility model provides an oil-cooled motor stator oil channel structure, in which a "Z"-shaped oil distribution structure is arranged at both ends of the stator core, and transverse oil guide grooves are designed at both ends of the "Z"-shaped structure to connect the longitudinal oil guide grooves. The oil distribution amount at both ends can be adjusted through the structure, and the flow resistance can be reduced to ensure that both ends can fully exchange heat and are lower than the specified temperature, thereby improving the heat dissipation performance and service life of the motor and promoting the further development of motor technology.

[0016] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 The schematic diagram of the oil channel structure of the oil-cooled motor stator of the utility model Figure 1 ;

[0019] Figure 2 The schematic diagram of the oil channel structure of the oil-cooled motor stator of the utility model Figure 2 ;

[0020] Figure 3 It is a structural schematic diagram of the oil channel structure of the stator of an oil-cooled motor in the prior art;

[0021] Description of Reference Numerals

[0022] 1. Stator core; 2. Welding end; 3. Crown end; 4. Circumferential truncation part 1; 5. Circumferential truncation part 2; 6. Longitudinal truncation part; 7. Circumferential oil guide groove 1; 8. Longitudinal oil groove 1; 9. Circumferential oil guide groove 2; 10. Longitudinal oil groove 2; 11. Longitudinal through oil channel. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] like Figure 1-2 As shown, the stator oil channel structure of the oil-cooled motor of the utility model is arranged on the outer circumference of the stator core 1, including a circumferential truncation portion 1 4, a circumferential truncation portion 2 5, a pair of longitudinal truncation portions 6, a circumferential oil guide groove 1 7, a circumferential oil guide groove 2 9, a plurality of longitudinal oil grooves 1 8 and a plurality of longitudinal oil grooves 2 10; and the circumferential truncation portion 1 4, the circumferential truncation portion 2 5 and the pair of longitudinal truncation portions 6 are sequentially connected to form a "Z"-shaped oil distribution structure.

[0025] Specifically, the circumferential oil guide groove 7 is located inside the circumferential truncation portion 4, one ends of a plurality of longitudinal oil grooves 8 are connected to the circumferential oil guide groove 7, and the other ends of a plurality of longitudinal oil grooves 8 are connected to the end of the stator core 1 and allow the cooling oil to flow to the crown end 3 respectively.

[0026] The circumferential oil guide groove 29 is located inside the circumferential truncation portion 25, one end of a plurality of longitudinal oil grooves 210 are all connected to the circumferential oil guide groove 29, and the other ends of a plurality of longitudinal oil grooves 210 are connected to the end of the stator core 1 so that the cooling oil flows to the welding end 2. Among them, the center angle R1 of the arc where the circumferential oil guide groove 17 is located is greater than the center angle R2 of the arc where the circumferential oil guide groove 29 is located, and the number of longitudinal oil grooves 18 is greater than the number of longitudinal oil grooves 210; so that the welding end can be allocated with more cooling oil, ensuring sufficient heat exchange of the cooling oil.

[0027] Compared with the traditional motors that have multiple longitudinal oil channels designed on the stator core, the number and area of ​​the oil grooves at the welding end and the crown end are equal, and the oil volume at the welding end and the crown end of the stator is basically the same; the stator oil channel structure of the present application adopts an asymmetric design, with a wider circumferential oil guide groove designed on the side flowing to the welding end, and a narrower circumferential oil guide groove designed on the crown end; so that the welding end can be allocated more cooling oil to ensure sufficient heat exchange of the cooling oil. In addition, the transverse oil guide grooves are designed at both ends of the "Z"-shaped structure to connect the longitudinal oil guide grooves, which can reduce the flow resistance and enable each longitudinal oil groove to fully exchange heat.

[0028] The working principle and working process of the oil-cooled motor stator oil channel structure of the utility model are briefly described below.

[0029] First, the circumferential oil guide groove 1 7 and circumferential oil guide groove 2 9 are machined on the stator core according to the drawings; the ratio of the center angle R1 to the center angle R2 is adjusted according to the different heat generation of the welding end and the crown end in the flat copper; then several longitudinal oil grooves 1 8 and several longitudinal oil grooves 2 10 are machined to form a "Z" type oil distribution structure on the stator core. After the motor is assembled, cooling oil is introduced into the circumferential oil guide groove 1 7 and the circumferential oil guide groove 2 9 through the oil holes on the casing, and the cooling oil in the circumferential oil guide groove 1 7 then flows to the longitudinal oil groove 1 8 in turn, and the cooling oil in the circumferential oil guide groove 2 9 then flows to the longitudinal oil groove 2 10 in turn, so that the welding end can be allocated more cooling oil to ensure sufficient heat exchange of the cooling oil.

[0030] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An oil channel structure for an oil-cooled motor stator, characterized in that: It comprises a circumferential truncation portion 1 (4), a circumferential truncation portion 2 (5), a pair of longitudinal truncation portions (6), a plurality of longitudinal oil grooves 1 (8) and a plurality of longitudinal oil grooves 2 (10); A plurality of the longitudinal oil grooves (8) are located on one side of the circumferential cut-off portion (4), and the ends of the plurality of the longitudinal oil grooves (8) are connected to an end of the stator core (1) close to the crown end (3); a plurality of the longitudinal oil grooves (10) are located on one side of the circumferential cut-off portion (5), and the ends of the plurality of the longitudinal oil grooves (10) are connected to an end of the stator core (1) close to the welding end (2); The circumferential truncation portion 1 (4), the circumferential truncation portion 2 (5) and a pair of longitudinal truncation portions (6) are sequentially connected to form a "Z"-shaped oil distribution structure; and the number of the longitudinal oil grooves 1 (8) is greater than the number of the longitudinal oil grooves 2 (10), so that the welding end (2) can be allocated more cooling oil, thereby ensuring sufficient heat exchange of the cooling oil.

2. The oil channel structure of the oil-cooled motor stator according to claim 1, characterized in that: A circumferential oil guide groove (7) is provided inside the circumferential cut-off portion (4), and one end of each of the plurality of longitudinal oil grooves (8) is respectively connected to the circumferential oil guide groove (7).

3. The oil channel structure of the oil-cooled motor stator according to claim 2 is characterized in that: A circumferential oil guide groove (9) is provided inside the circumferential cut-off portion (5), and one end of a plurality of the longitudinal oil grooves (10) are respectively connected to the circumferential oil guide groove (9).

4. The oil channel structure of the oil-cooled motor stator according to claim 3 is characterized in that: The center angle R1 of the circular arc where the circumferential oil guide groove 1 (7) is located is greater than the center angle R2 of the circular arc where the circumferential oil guide groove 2 (9) is located.

5. The oil channel structure of the oil-cooled motor stator according to claim 1, characterized in that: The cooling oil in the plurality of longitudinal oil grooves (8) flows toward the crown end (3) respectively.

6. The oil channel structure of the oil-cooled motor stator according to claim 1, characterized in that: The cooling oil in the plurality of longitudinal oil grooves 2 (10) flows toward the welding ends (2) respectively.

7. The oil channel structure of the oil-cooled motor stator according to claim 1, characterized in that: The stator oil channel structure is arranged on the outer circumference of the stator iron core (1).

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