A stator direct injection oil-cooled motor heat dissipation structure and motor

Abstract

The present invention relates to the technical field of motors, and provides a stator direct-injection oil-cooled motor heat dissipation structure and a motor, comprising a motor housing, a stator core, and a stator winding. The stator core is fixedly connected to the motor housing, an oil inlet and an oil outlet are provided on the motor housing, a plurality of cooling oil grooves extending axially are provided on the circumference of the stator core, the cooling oil grooves are blind grooves, and scattering cavities are provided on both end walls of the stator core. The two axial end faces of the blind groove inner cavity and the axial groove bottom surface of the scattering cavity are in the same plane, and the two axial end faces of the blind groove inner cavity are connected to the axial groove bottom surface of the scattering cavity through a spray hole. The spray hole is located at a portion of the blind groove close to the center of a circle and a portion of the scattering cavity close to the circumference, and is used to spray oil to the stator winding protruding from the two axial ends of the stator, thereby forming a motor oil-cooling heat dissipation structure, thereby solving the problems of high cost, complex structure, and difficult assembly of direct-injection oil-cooled motors.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator direct injection oil-cooled motor heat dissipation structure and the motor. Background Art

[0002] As the automotive industry develops and new energy vehicles enter a new stage of development, major automakers are increasingly demanding higher performance from new energy vehicle motors. Motor cooling efficiency is directly related to motor performance, and oil-cooled motors, due to their high cooling efficiency, have become the preferred choice for many automakers. Currently, the primary cooling structure for oil-cooled motor stators and their windings involves placing oil spray rings or pipes around the windings. Cooling oil is then sprayed onto the motor windings along these rings or pipes, thereby cooling the windings. However, this cooling structure not only requires numerous oil spray rings or pipes around the windings but also requires a large number of fixed parts, increasing motor cost and complicating the assembly process, hindering cost reduction and efficiency improvement.

[0003] Patent application number CN113612322A discloses an oil-cooled motor heat dissipation structure and motor. This structure employs a plurality of laminations with circumferentially arranged oil spray holes at both ends of the stator. These laminations are rotated and staggered so that the oil spray holes on the laminations form an oil spray channel oblique to the windings. Cooling oil is then sprayed from the stator's circumferential oil channel through the oil spray channel onto the windings, achieving the purpose of cooling the windings. However, the iron laminations required for this structure require specific holes to be designed, and the stator's axial ends are formed by multiple laminations that are rotated and staggered to form an oil spray channel to constrain the direction of the cooling oil spray and ensure effective cooling of the stator windings. The laminations used at both axial ends are complex in structure, and the large number of laminations leads to high production costs. Furthermore, the rotational staggering of the laminations requires multiple steps, making assembly difficult. Misalignment of the laminations can even clog the oil spray channel, affecting the motor's cooling efficiency. Addressing these issues requires a stator direct-injection oil-cooled motor heat dissipation structure and motor that is low-cost, simple in structure, and easy to assemble. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and provide a stator direct injection oil-cooled motor heat dissipation structure and motor to solve the problems of high cost, complex structure and difficult assembly of direct injection oil-cooled motors.

[0005] The technical solution of the present invention is: a stator direct injection oil-cooled motor heat dissipation structure, including a motor housing, a stator core, and a stator winding. The stator core is fixedly connected to the motor housing, and an oil inlet and an oil outlet are provided on the motor housing. A plurality of cooling oil grooves extending axially are provided on the circumference of the stator core, and the cooling oil grooves are blind grooves. A scattering cavity is provided on the two end walls of the stator core, and the two axial end faces of the blind groove inner cavity and the axial groove bottom surface of the scattering cavity are in the same plane. The two axial end faces of the blind groove inner cavity are connected to the axial groove bottom surface of the scattering cavity through a spray hole. The spray hole is located near the center of the blind groove and the circumference of the scattering cavity, and is used to spray oil to the stator winding protruding from the two axial ends of the stator to form a motor oil-cooled heat dissipation structure.

[0006] The diameter of the injection hole is α, and α is 0.5-2.5 mm.

[0007] A first guide groove is axially arranged at the bottom of the blind groove and is communicated with the injection hole.

[0008] The cross section of the first guide groove is semicircular.

[0009] The diameter of the first guide groove is the same as the diameter of the injection hole.

[0010] A second guide groove is provided on the top of the scattering cavity and is communicated with the injection hole.

[0011] The cross section of the second guide groove is semicircular.

[0012] The diameter of the second guide groove is the same as the diameter of the injection hole.

[0013] The side of the scattering cavity close to the center of the circle is on the same circumference as the outer circumferential surface of the stator winding.

[0014] A motor comprises the above-mentioned stator direct injection type oil-cooled motor heat dissipation structure.

[0015] The above technical solution is adopted: a stator direct injection oil-cooled motor heat dissipation structure, including a motor housing, a stator core, and a stator winding. The stator core is fixedly connected to the motor housing, and an oil inlet and an oil outlet are provided on the motor housing. A plurality of cooling oil grooves extending axially are provided on the circumference of the stator core. The cooling oil grooves are blind grooves. A scattering cavity is provided on the two end walls of the stator core. The two axial end faces of the blind groove inner cavity and the axial groove bottom surface of the scattering cavity are in the same plane. The two axial end faces of the blind groove inner cavity are connected to the axial groove bottom surface of the scattering cavity through a spray hole. The spray hole is located at a position near the center of the blind groove and a position near the circumference of the scattering cavity, and is used to spray oil to the stator winding protruding from the two axial ends of the stator to form a motor oil-cooled heat dissipation structure. Blind slots guide the coolant, while scattering cavities deflect coolant sprayed obliquely toward the center of the circle. Spray holes connect the blind slots on the stator core with the scattering cavities at both ends of the stator core, forming an oil spray channel. Coolant is sprayed obliquely toward the center of the circle directly onto the stator windings for cooling. The coolant in the motor ultimately flows out of the motor through oil outlet 11, achieving heat dissipation. This stator direct-injection oil-cooled motor heat dissipation structure is simple in structure, reduces production costs, facilitates assembly, and effectively optimizes the assembly process.

[0016] The aperture of the injection hole is α, which is 0.5-2.5 mm. The cross-sectional area of ​​the injection hole is much smaller than the cross-sectional area of ​​the blind groove, ensuring that the coolant coming out of the injection hole is in a spraying state.

[0017] A first guide groove is axially disposed at the bottom of the blind groove, communicating with the injection hole. The first guide groove has a semicircular cross-section. A second guide groove is disposed at the top of the scattering cavity, communicating with the injection hole. The second guide groove has a semicircular cross-section. The diameters of the first and second guide grooves are the same as the diameter of the injection hole. The two guide grooves guide the coolant, facilitating the formation of a spray at the injection hole.

[0018] The side of the scattering cavity close to the center of the circle is on the same circumference as the outer circumferential surface of the stator winding, which can simplify the structure of the two ends of the stator core and save production materials.

[0019] A motor comprises the above-mentioned stator direct injection type oil-cooled motor heat dissipation structure.

[0020] The stator direct injection oil-cooled motor heat dissipation structure and motor of the present invention do not require multiple iron core sheets to be arranged at both ends of the stator iron core. It only needs to connect the two axial end faces of the blind slot inner cavity with the axial slot bottom surface of the scattering cavity through the injection hole and be in the same plane. The coolant can be directly sprayed from the stator obliquely toward the center of the circle onto the stator winding, thereby achieving the purpose of cooling the winding. The structure is simple, the production cost is low, and the assembly is convenient.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view at point A;

[0024] Figure 3 for Figure 1 Cross-section at point A;

[0025] Figure 4 Schematic diagram of the structure of the stator core of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the first core sheet of the present invention;

[0027] Figure 6 for Figure 5 Enlarged view at point B;

[0028] Figure 7 Schematic diagram of the structure of the second core sheet of the present invention;

[0029] Figure 8 for Figure 7 Enlarged view at point C;

[0030] Figure 9 It is a left side view of the stator core of the present invention;

[0031] Figure 10 for Figure 9 Enlarged view at D;

[0032] Figure 11 This is a working principle diagram of the present invention. DETAILED DESCRIPTION

[0033] See also Figures 1 to 10A heat dissipation structure for a stator direct-injection oil-cooled motor includes a motor housing 1, a stator core 4, and a stator winding 5. The stator core 4 is fixedly connected to the motor housing 1. The motor housing 1 is provided with an oil inlet 10 and an oil outlet 11. An annular groove is radially provided on the inner circumference of the motor housing 1, and the annular groove communicates with the oil inlet 10. The stator core 4 is provided with multiple evenly distributed axially extending cooling oil grooves. The cooling oil grooves are blind grooves 6. A first guide groove 62 is axially provided at the bottom of the blind groove 6. The cross-section of the first guide groove 62 is semicircular. Scattering cavities 9 are provided at both end walls of the stator core 4. A second guide groove 93 is provided at the top of the scattering cavity 9. The second guide groove 93 is semicircular in cross-section. The scattering cavities 9 are rectangular grooves, the number of which is the same as that of the blind grooves and is evenly distributed on the both end walls of the stator core 4; alternatively, the scattering cavities 9 are annular grooves surrounding the stator winding. The side 92 of the scattering cavity 9 close to the center of the circle extends toward the center of the circle and can be on the same circumference as the outer circumference of the stator winding 5. The two axial end faces 61 of the inner cavity of the blind groove 6 are on the same plane as the axial groove bottom surface 91 of the scattering cavity 9. The two axial end faces 61 of the inner cavity of the blind groove 6 are connected to the axial groove bottom surface 91 of the scattering cavity 9 through the injection hole 8. The aperture of the injection hole 8 is α, and α is 0.5 to 2.5 mm. The injection hole 8 is connected to the first guide groove 62 and the second guide groove 93 and has the same diameter. The injection hole 8 is located at the part of the blind groove 6 close to the center of the circle and the part of the scattering cavity 9 close to the circumference, and is used to spray oil to the stator winding 5 protruding from the two axial ends of the stator to form an oil-cooled heat dissipation structure of the motor. A motor includes the above-mentioned stator direct injection type oil-cooled motor heat dissipation structure.

[0034] In this embodiment, the laminations that make up the stator core 4 include a first lamination 41 positioned in the center and second laminations 40 at either end. The first and second laminations 41, 40 are circular rings with identical inner and outer diameters. Multiple first grooves 411 are evenly distributed around the outer circumference of the first lamination 41. Welding grooves (not shown) are located between adjacent first grooves 411. The bottoms of the first grooves 411 have first semicircular grooves 414 extending toward the center. The central portion of the stator core 4 is formed by stacking multiple first laminations 41. The first grooves 411 on the multiple first laminations 41 form cooling oil grooves extending axially along the circumference of the stator core 4. The first semicircular grooves 414 at the bottoms of the first grooves 411 form first guide grooves 62. First through-holes 401 are evenly distributed around the outer circumference of the second lamination 40. Welding grooves are located between adjacent first through-holes 401. Second semicircular grooves 404 extending outward from the center are located on the walls of the first through-holes 401 away from the center. The second semicircular grooves 404 and the first semicircular grooves 414 have the same diameter. The second core sheets 40 assembled at both ends of the stator core 4 are core sheets of the same structure and size. The number of core sheets can be multiple or each can be one sheet. In this embodiment, one sheet is used so that the center of the second semicircular groove 404 coincides with the center of the first semicircular groove 414 to form the injection hole 8, and the first through hole 401 forms a scattering cavity 9.

[0035] See also Figure 11 The working principle of the heat dissipation structure of the stator direct injection oil-cooled motor of this embodiment is as follows: the coolant enters the motor from the oil inlet and flows to the end of the blind groove 6. The coolant in the blind groove 6 away from the center of the circle is blocked by the axial end surface 61. The dynamic pressure of this part of the coolant is converted into static pressure to form a pressure in the direction of the center of the circle, while the coolant in the blind groove 6 close to the center of the circle has an axial pressure. Since the two axial end surfaces 61 of the inner cavity of the blind groove 6 are connected with the axial groove bottom surface 91 of the scattering cavity 9 through the injection hole 8 and are in the same plane, when the coolant passes through the injection hole 8, it will form a resultant force with an angle θ between the oblique center of the circle and the end wall of the stator core. In addition, the diameter of the injection hole 8 is small, and the coolant is scattered on the stator winding in a spray shape. The coolant finally flows out of the motor from the oil outlet 11, taking away the heat, thereby achieving the purpose of cooling the stator winding. There is no need to set many iron sheets with complex structures at both ends of the iron core to form an oil injection channel of a certain length to restrict the direction of the coolant. In this way, the number or thickness of the iron sheets at the axial ends of the stator core can be reduced, the structure of the stator core ends is simple, and the production cost is reduced. In this embodiment, the distance from the bottom of the first guide groove 62 to the motor housing is H1, and the distance from the bottom of the second guide groove 93 to the motor housing is H. The angle θ of the oblique resultant force formed by the coolant through the injection hole is inversely proportional to the value of H / H1.

[0036] A motor having a shaft 2 passing through a rotor core 3 and supported on a motor housing 1 by bearings. When the motor is operated using the above-mentioned stator direct injection oil-cooled motor heat dissipation structure, coolant enters the motor from an oil inlet 10 on the motor housing 1, flows through the annular groove on the inner circumferential surface of the motor housing 1 to the blind groove 6 on the circumference of the stator core 4, and then flows to the two ends of the stator core 4 through the blind groove 6. When the coolant flows to the end of the blind groove 6, it is sprayed onto the stator winding through the spray hole 8. The coolant finally flows out of the motor from the oil outlet 11, carrying away heat and achieving the purpose of cooling the stator winding. The stator direct injection oil-cooled motor heat dissipation structure of this embodiment can not only cool the stator winding, but also cool the motor housing and stator core.

[0037] Compared with the prior art, the stator core of the present invention has a simple structure. It only needs to ensure that the two axial end faces of the blind slot inner cavity are connected to the axial slot bottom surface of the scattering cavity through the injection hole and are in the same plane to achieve the purpose of cooling the stator winding. There is no need to arrange multiple iron core sheets with complex structures at both ends of the stator to form staggered oil injection channels to constrain the cooling liquid. This not only saves production costs, but also reduces the stator molding and assembly processes, thereby reducing the difficulty of assembly.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A stator direct injection oil-cooled motor heat dissipation structure, comprising a motor housing (1), a stator core (4), and a stator winding (5), wherein the stator core (4) is fixedly connected to the motor housing (1), an oil inlet (10) and an oil outlet (11) are provided on the motor housing (1), and a plurality of cooling oil grooves extending in the axial direction are provided on the circumference of the stator core (4), characterized in that: The cooling oil groove is a blind groove (6), and the two end walls of the stator core (4) are provided with a scattering cavity (9). The two axial end faces (61) of the inner cavity of the blind groove (6) and the axial groove bottom face (91) of the scattering cavity (9) are in the same plane. The two axial end faces (61) of the inner cavity of the blind groove (6) and the axial groove bottom face (91) of the scattering cavity (9) are connected through a spray hole (8). A first guide groove (62) is axially provided at the bottom of the blind groove (6) and is connected to the spray hole (8). The spray hole (8) is located at a portion of the blind groove (6) close to the center of the circle and a portion of the scattering cavity (9) close to the circumference, and is used to spray oil to the stator winding (5) protruding from the two axial ends of the stator to form an oil-cooling heat dissipation structure of the motor. A second guide groove (93) is provided at the top of the scattering cavity (9) and is connected to the spray hole (8).

2. The heat dissipation structure of a stator direct injection oil-cooled motor according to claim 1, characterized in that: The aperture of the injection hole (8) is α, and α is 0.5 to 2.5 mm.

3. The heat dissipation structure of a stator direct injection oil-cooled motor according to claim 1, characterized in that: The cross section of the first guide groove (62) is semicircular.

4. The heat dissipation structure of a stator direct injection oil-cooled motor according to claim 1, characterized in that: The diameter of the first guide groove (62) is the same as the diameter of the injection hole (8).

5. The heat dissipation structure of a stator direct injection oil-cooled motor according to claim 1, characterized in that: The cross section of the second guide groove (93) is semicircular.

6. The heat dissipation structure of a stator direct injection oil-cooled motor according to claim 1, characterized in that: The diameter of the second guide groove (93) is the same as the diameter of the injection hole (8).

7. The heat dissipation structure of a stator direct injection oil-cooled motor according to claim 1, characterized in that: The side (92) of the scattering cavity (9) close to the center of the circle is located on the same circumference as the outer circumferential surface of the stator winding (5).

8. A motor, characterized in that: It includes the heat dissipation structure of the stator direct injection oil-cooled motor according to claim 1.

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