Oil-cooled motor stator and oil-cooled motor

Abstract

The utility model discloses an oil cooling motor stator and oil cooling motor, motor stator includes: stator core assembly, stator core assembly includes stator punching sheet no.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to an oil-cooled motor stator and an oil-cooled motor. Background Technology

[0002] With the increasing demands on motor performance in modern industry and transportation, flat-wire motors have gained wider application due to their advantages in slot fill factor, power density, and heat dissipation. They are gradually becoming the mainstream choice in electric vehicles and industrial drives. In recent years, to further improve power density and heat dissipation, flat-wire motors have gradually transitioned from traditional water cooling to oil cooling. Compared to water cooling, oil cooling provides a larger contact area between the cooling medium and the stator windings, resulting in fewer heat transfer paths and significantly improved heat dissipation efficiency. This improved heat dissipation effectively increases the motor's power density.

[0003] Working Principle: Oil cooling in motors is a direct cooling technology, broadly categorized into stator cooling and rotor cooling. Rotor cooling is suitable for applications with high rotor losses or requiring enhanced protection against temperature rise in the permanent magnets; oil-cooled shaft technology is commonly used. Stator cooling can be achieved by circulating oil through the stator core or by cooling the stator through oil spray rings at the ends. Under the action of a centrifugal pump, the cooling oil flows through the parts of the motor that require cooling, carrying away heat and thus achieving motor cooling.

[0004] Classification: Motor oil cooling can be divided into immersion cooling and oil circulation cooling. Oil circulation cooling uses an oil pump to force the oil to circulate for heat dissipation and is currently the mainstream solution. Immersion cooling has higher heat dissipation efficiency, but it still faces many unresolved challenges, although it has great potential for future development.

[0005] Advantages and features: Oil cooling offers high heat dissipation efficiency, effectively reducing motor temperature and improving power density and continuous performance. Compared to water-cooled motors, oil-cooled motors can achieve a 30% increase in continuous torque and continuous power. Simultaneously, oil cooling systems significantly reduce the risk of condensation, eliminate electrochemical corrosion problems, improve the strength and electrical performance of components, and extend motor lifespan; some oil-cooled motors are designed for a lifespan of up to one million kilometers.

[0006] In oil-cooled motor solutions, the more traditional approaches include the following: (1) A slot is cut in the housing, and the oil passage is sealed by interference fit with the stator to achieve motor cooling. This solution can cool the iron core and copper wire within the effective length of the stator. However, since the oil coming out of the housing cannot directly reach the winding ends, it cannot cool the ends, resulting in excessively high local temperatures at the ends. (2) Slotting is made near the outer diameter of the stator lamination. This solution is similar to slotting in the housing. It can achieve cooling within the effective length of the stator, but cannot cool the end windings, resulting in excessively high local temperature at the end. (3) Grooving is adopted in the shell or the outer diameter of the stator lamination, and oil injection ring assemblies are used at both ends. This solution can achieve cooling of the effective length and ends of the stator. The oil injection ring assembly consists of an inner lining stamping structure, an outer injection molding structure, and rubber seals, etc. One set of oil injection ring assembly requires 3-4 sets of molds, which are expensive and have a high unit cost. For commercial vehicles and construction machinery applications with smaller quantities, the cost of mold sharing is even higher, which will greatly reduce the competitiveness of the product. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides an oil-cooled motor stator and an oil-cooled motor. The cooling oil is evenly distributed to the stator winding ends at both ends of the stator core assembly through oil channels inside the stator core assembly. It can also achieve directional angle spraying of the cooling oil, allowing the cooling oil to be directly sprayed onto the winding ends for direct cooling of the stator winding ends. At the same time, the oil spray rings and oil spray ring sealing assemblies at both ends of the stator core assembly are eliminated, reducing the cost of the motor and improving the uniformity and reliability of the motor's heat dissipation.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: In a first aspect, an oil-cooled motor stator is provided, comprising: a stator core assembly, a stator winding wound on the stator core assembly, and insulating paper embedded between the stator core assembly and the stator winding; wherein, the stator core assembly includes a predetermined number of stator laminations 1, 2, and 3; the outer circumference of the stator lamination 1 is provided with a plurality of serrated portions and serrated grooves at intervals, each serrated portion being provided with an oil hole 1 penetrating the stator lamination 1; the stator lamination 2 is provided with a plurality of oil holes 2 penetrating the stator lamination 2; the stator lamination 3 is provided with a plurality of sets of oil holes 3 penetrating the stator lamination 3; cooling oil is sprayed at a predetermined angle to the end of the stator winding along the cooling oil path formed by the serrated grooves, oil holes 1, oil holes 2, and oil holes 3.

[0009] Furthermore, each group of oil holes three includes multiple oil injection holes, which are deflected relative to each other at a set angle on the stator lamination three and are located at different inner diameters of the stator lamination three.

[0010] Furthermore, a predetermined number of stator laminations are stacked to form intermediate laminations. Several intermediate laminations are rotated relative to each other by a predetermined angle and then stacked together to form lamination group one. On both sides of lamination group one, lamination group two, lamination group three, and lamination group four are arranged sequentially. Specifically, a predetermined number of stator laminations are rotated relative to each other by a predetermined angle and then stacked together to form lamination group two; a predetermined number of stator laminations are rotated relative to each other by a predetermined angle and then stacked together to form lamination group three; and a predetermined number of stator laminations are rotated relative to each other by a predetermined angle and then stacked together to form lamination group four.

[0011] Furthermore, the shape of the fuel injection hole is one of rectangular, circular, or elliptical.

[0012] Furthermore, the shape of the first oil hole is one of a rectangle, a circle, or an ellipse; the shape of the second oil hole is one of a rectangle, a circle, or an ellipse.

[0013] Furthermore, stator lamination 1, stator lamination 2, and stator lamination 3 are all silicon steel sheets.

[0014] Furthermore, the stator winding is obtained by winding flat copper wire around the stator core assembly.

[0015] In a second aspect, an oil-cooled motor is provided, wherein the motor is equipped with the oil-cooled motor stator described in the first aspect.

[0016] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This utility model provides serrated portions and serrated grooves at intervals on the outer circumference of stator lamination one, with each serrated portion having an oil hole one penetrating stator lamination one; stator lamination two has an oil hole two penetrating stator lamination two; stator lamination three has an oil hole three penetrating stator lamination three; cooling oil is sprayed at a set angle along the cooling oil path formed by the serrated grooves, oil holes one, oil holes two and oil holes three to the end of the stator winding; it can realize the directional angle spraying of cooling oil, so that the cooling oil can be directly sprayed to the end of the winding, realizing direct cooling of the end of the stator winding. At the same time, the oil spray rings and oil spray ring sealing assemblies at both ends of the stator core assembly are eliminated, reducing the cost of the motor and improving the uniformity and reliability of the motor's heat dissipation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the planar structure of an oil-cooled motor stator provided in an embodiment of the present invention; Figure 2 This is a partial enlarged view of the end of the oil-cooled motor stator in an embodiment of this utility model; Figure 3 This is a schematic diagram of the cooling oil distribution in the stator of the oil-cooled motor in this embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a stator lamination 1 in an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of stator lamination 2 in this embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of stator lamination three in this embodiment of the present invention; Figure 7 This is a schematic diagram of the planar structure of the stator core assembly in an embodiment of this utility model; In the diagram: 1. Stator winding; 2. Insulating paper; 3. Stator core assembly; 31. Intermediate lamination; 32. Lamination group two; 33. Lamination group three; 34. Lamination group four; 301. Stator lamination one; 302. Stator lamination two; 303. Stator lamination three; 3011. Serrated section; 3012. Serrated groove; 3013. Oil hole one; 3021. Oil hole two; 3031. Oil hole three; 30311. Oil spray hole one; 30312. Oil spray hole two; 30313. Oil spray hole three; S. Cooling oil distribution path. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0019] Example 1 like Figures 1-7 As shown, an oil-cooled motor stator includes: a stator core assembly 3, a stator winding 1 wound on the stator core assembly 3, and insulating paper 2 embedded between the stator core assembly 3 and the stator winding 1.

[0020] In this invention, the stator winding 1 is obtained by winding flat copper wire in the slot of the stator core assembly 3; the insulating paper 2 embedded between the stator winding 1 and the stator core assembly 3 composed of three different laminations serves as insulation.

[0021] The stator core assembly 3 includes a predetermined number of stator laminations 301, 302, and 303. The outer circumference of stator lamination 301 is provided with a plurality of serrated portions 3011 and serrated grooves 3012 at intervals. Each serrated portion 3011 is provided with an oil hole 3013 penetrating the stator lamination 301. Stator lamination 302 is provided with a plurality of oil holes 3021 penetrating the stator lamination 302. Stator lamination 303 is provided with a plurality of oil holes 3031 penetrating the stator lamination 303. Cooling oil is sprayed at a predetermined angle to the end of the stator winding 1 along the cooling oil path formed by the serrated grooves 3012, oil holes 3013, oil holes 3021, and oil holes 3031.

[0022] Oil hole 1 (3013) has a shape that is rectangular, circular, or elliptical; oil hole 2 (3021) has a shape that is rectangular, circular, or elliptical. Stator lamination 1 (301), stator lamination 2 (302), and stator lamination 3 (303) are all made of silicon steel sheets.

[0023] Each set of oil holes 3031 contains multiple oil injection holes (oil injection hole 1 30311, oil injection hole 2 30312, oil injection hole 30313). The multiple oil injection holes are deflected relative to each other at a set angle on the stator lamination 303, and are located at different inner diameters of the stator lamination 303. The shape of the oil injection holes is one of rectangle, circle, or ellipse.

[0024] In this invention, the stator core assembly 3 achieves uniform distribution of cooling oil inside the stator through the combination of three types of laminations, and enables directional angle spraying of cooling oil after it flows out of the stator, so that the cooling oil is directly sprayed onto the end of the stator winding 1.

[0025] like Figure 3 As shown, the stator core assembly 3 is composed of three different silicon steel laminations, and the thickness of a single stator lamination is 0.27 mm. Figure 3 The red arrow in the middle indicates the coolant distribution path S.

[0026] Figure 4 The stator lamination 301 has a uniform serrated groove 3012 on its outer diameter. The serrated part 3011 also has a separate rectangular slot (oil hole 3013) to realize the distribution of cooling oil from the housing to the stator circumferential direction. This structure can realize the rapid circumferential filling of cooling oil and radial oil distribution.

[0027] Figure 5 The stator lamination 302 has a uniform square oil groove (oil hole 3021) on its outer diameter to allow cooling oil to flow axially and cool the stator core assembly 3.

[0028] Figure 6 The stator lamination 303 has a shape with square slots of the same shape on different inner diameters at its ends (i.e., multiple sets of oil holes 3031, each set of oil holes 3031 including oil injection hole 1 30311, oil injection hole 2 30312, and oil injection hole 30313). During assembly, the angle of the cooling oil spray can be adjusted by rotating it by a certain angle, so that the cooling oil can be directly sprayed onto the end of the stator winding 1, thereby achieving cooling of the end of the stator winding 1.

[0029] The above three types of laminations, through a certain combination, can make the cooling oil flow according to... Figure 3The flow direction (cooling oil distribution path S) is distributed so that the cooling oil can flow evenly through the stator core assembly and be sprayed onto the end windings at a set angle, making the motor cool more evenly.

[0030] In this invention, a predetermined number of stator laminations 301 are stacked to form intermediate laminations 31. Several intermediate laminations 31 are rotated relative to each other by a predetermined angle and then stacked together to form a lamination group. Figure 7 As shown, the three middle sections of the stator core assembly 3 are composed of stator laminations 301. The first middle section is a lamination 31 with a thickness of 'a' (a=3.5mm) and an angle of 0 degrees. The second middle section is a lamination 31 with a thickness of 'a', which is stator lamination 301 rotated 15° to fit into the first middle section. The third middle lamination 31 with a thickness of 'a' is the same as the first section, fitting at a 0-degree angle.

[0031] On both sides of the first stacked plate group, a second stacked plate group 32, a third stacked plate group 33, and a fourth stacked plate group 34 are respectively arranged sequentially. For example... Figure 7 As shown, the two symmetrical lamination groups 32 with length b (b=21.24mm) are formed by stacking stator laminations 302.

[0032] The lamination group 33 with a thickness of a near both ends is formed by stacking stator lamination 301.

[0033] The lamination group 434, with a thickness of c (c=3.78mm) at both ends, is formed by rotating the stator lamination 303 by a certain angle. For example... Figure 7 As shown, it is divided into three sections, each rotated 20°. The first section consists of two 0.27mm silicon steel sheets, the second section consists of six 0.27mm silicon steel sheets, and the third section consists of six 0.27mm silicon steel sheets.

[0034] This invention features three square slots (i.e., oil injection hole 30311, oil injection hole 30312, and oil injection hole 30313) at three different radial positions on the stator lamination 303. When the stator lamination 303 is rotated and installed at a certain angle, the three oil injection holes on the stator lamination 303 are superimposed in the thickness direction to form an oil channel with a certain centripetal angle, so that the oil can be sprayed onto the winding at the end of the channel at a certain angle.

[0035] This invention achieves cooling of the radial and end windings of the motor through different combinations of stator laminations, allowing the oil to be evenly distributed within the stator core and controlling the spray angle. It eliminates the need for oil spray ring assemblies at both ends, improving cooling efficiency and reducing unit price and mold costs.

[0036] Example 2 Based on the oil-cooled motor stator described in Embodiment 1, this embodiment provides an oil-cooled motor, wherein the motor is configured with the oil-cooled motor stator described in Embodiment 1.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An oil-cooled motor stator, characterized in that, include: Stator core assembly (3), stator winding (1) wound on stator core assembly (3), and insulating paper (2) embedded between stator core assembly (3) and stator winding (1); The stator core assembly (3) includes a set number of stator laminations 1 (301), 2 (302) and 3 (303). The stator lamination 1 (301) is provided with a plurality of serrated portions (3011) and serrated grooves (3012) at intervals on its outer circumference, and each of the serrated portions (3011) is provided with an oil hole 1 (3013) that penetrates the stator lamination 1 (301). The stator lamination 2 (302) is provided with a plurality of oil holes 2 (3021) penetrating the stator lamination 2 (302). The stator lamination 3 (303) is provided with a number of oil holes 3 (3031) that penetrate the stator lamination 3 (303). Cooling oil is sprayed at a set angle to the end of the stator winding (1) along the cooling oil path formed by the sawtooth groove (3012), oil hole one (3013), oil hole two (3021) and oil hole three (3031).

2. The oil-cooled motor stator according to claim 1, characterized in that, Each set of oil holes three (3031) includes multiple oil injection holes, which are deflected relative to each other at a set angle on the stator lamination three (303) and are located at different inner diameters of the stator lamination three (303).

3. The oil-cooled motor stator according to claim 2, characterized in that, A set number of stator laminations (301) are stacked to form intermediate laminations (31). Several intermediate laminations (31) are rotated relative to each other by a set angle and then stacked together to form lamination group one. On both sides of the first stacked sheet group, the second stacked sheet group (32), the third stacked sheet group (33), and the fourth stacked sheet group (34) are arranged in sequence. Among them, a set number of stator laminations (302) are stacked together after being rotated relative to each other by a set angle to form a lamination group (32). A set number of stator laminations (301) are rotated relative to each other by a set angle and then stacked together to form lamination group three (33). A set number of stator laminations (303) are rotated relative to each other by a set angle and then stacked together to form a lamination group (34).

4. The oil-cooled motor stator according to claim 3, characterized in that, The shape of the fuel injection hole is one of rectangular, circular, or elliptical.

5. The oil-cooled motor stator according to claim 1, characterized in that, The shape of the oil hole (3013) is one of rectangle, circle, or ellipse; The oil hole 2 (3021) is rectangular, circular, or elliptical in shape.

6. The oil-cooled motor stator according to claim 1, characterized in that, The stator laminations 1 (301), 2 (302), and 3 (303) are all made of silicon steel sheets.

7. The oil-cooled motor stator according to claim 1, characterized in that, The stator winding (1) is obtained by winding flat copper wire on the stator core assembly (3).

8. An oil-cooled motor, characterized in that, The motor is equipped with an oil-cooled motor stator as described in any one of claims 1 to 7.

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