Stator heat dissipation structure of oil-cooled motor

Abstract

A stator heat dissipation structure of an oil cooling motor comprises a stator iron core assembly arranged in a cooling system of the oil cooling motor, and the stator iron core assembly comprises a sleeve set and a stator iron core section arranged on the sleeve set in a sleeving mode. The stator iron core section is formed by laminating four punching sheets, namely at least one middle iron core section, a plurality of stator iron core sections A, a plurality of stator iron core sections B and two side surface iron core sections; and the middle iron core section, the stator iron core section A, the stator iron core section B and the side iron core sections are respectively provided with a plurality of oil channels for cooling oil to flow through. A stator oil path for cooling oil to flow is formed by the oil channels of the four punching sheets, so that the contact area between the winding and the cooling oil is enlarged, and the heat dissipation efficiency is improved; moreover, the number of the oil channels of the stator core A section is different from that of the oil channels of the stator core B section, so that the whole stator oil channels are dispersed and staggered; the number and the arrangement sequence of the four punching sheets can be adjusted according to oil cooling motors of different specifications so as to adapt to different heat dissipation requirements, the flexibility is high, and the applicability is wide.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy automobile motor technology field especially is a kind of stator heat dissipation structure of oil-cooled motor. BACKGROUND

[0002] With the development of electric vehicles, the market demand for power density and high torque of motor is increasing. However, the large electrical load leads to the increase of motor temperature rise, so improving the performance of cooling system to reduce temperature rise becomes the key.

[0003] The existing oil-cooled motor realizes cooling by setting oil way on the parts such as casing, end cover, rotating shaft and core, and connecting oil pump, heat exchanger and filter. Cooling oil enters the oil way from the oil inlet, takes away heat by flowing and spraying on the winding, and then returns to the oil tank through the heat exchanger and filter to complete the circulation.

[0004] The general combined stator core on the market is stacked by punching sheet. In order to realize the radial or circumferential flow of cooling oil, the number of oil channels in the punching sheet is the same. The oil channels in these punching sheets form an annular oil way, which leads to small contact area between the surface of the stator and the cooling medium, long heat conduction path and low heat dissipation efficiency. At the same time, this oil channel layout makes the heat dissipation effect of the stator core single, which is only suitable for conventional oil-cooled motor and cannot realize efficient heat dissipation for different specifications of oil-cooled motor, so the use range is small. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A stator heat dissipation structure of oil-cooled motor, comprising a stator core assembly arranged in the cooling system of the oil-cooled motor, wherein the stator core assembly comprises a winding and a stator core segment sleeved on the winding, and the stator core segment is composed of four kinds of punching sheets, i.e. a middle core segment, a plurality of stator core A segments, a plurality of stator core B segments and two side core segments; the middle core segment, the stator core A segment, the stator core B segment and the side core segment are respectively provided with a plurality of oil channels for cooling oil to flow through, and the number of oil channels of the stator core A segment is different from that of the stator core B segment.

[0007] Further, the cooling system of the oil-cooled motor further comprises a casing, wherein the casing is provided with an oil inlet and an oil outlet; the stator core assembly is arranged in the casing, the stator core segment takes the middle core segment as the symmetry axis, the stator core A segment and the stator core B segment are arranged on the two sides of the middle core segment in a staggered manner, and the side core segments are arranged on the outermost two sides; the oil channels of the middle core segment are directly connected with the oil inlet of the casing, and the stator core A segment, the stator core B segment and the side core segment are respectively in interference fit with the casing.

[0008] Further, the number of oil channels in the stator core B section is more than that in the stator core A section, and the oil channels in the stator core section are composed of the side core section, the stator core A section, the stator core B section, and the intermediate core section, and are staggered by lamination and welding.

[0009] Further, the oil channels in the side core section are divided into an upper area and a lower area in the horizontal direction, the number of oil channels distributed in the upper area is more than that in the lower area, and the arrangement of the oil channels in the upper area is denser than that in the lower area.

[0010] Further, the oil channels in the total monitoring core section, the side core section, the stator core A section, or the stator core B section are gradually tapered oil channels with a wide inlet and a narrow outlet.

[0011] Further, the oil channels are rectangular, circular, or waisted.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] 1. The intermediate core section, the stator core A section, the stator core B section, and the side core section are laminated to form the stator core section, the stator core section is sleeved on the winding, the four kinds of stampings are provided with a plurality of oil channels for cooling oil flow, and the stator oil circuit is formed, thereby expanding the contact area of the cooling oil and the stator core section and improving the heat dissipation efficiency; the number of oil channels in the stator core A section is different from that in the stator core B section, so that the overall stator oil circuit is dispersed and staggered; the number and arrangement order of the four kinds of stampings can be adjusted according to different specifications of the oil-cooled motor to adapt to different heat dissipation requirements, and the flexibility is high and the applicability is wide.

[0014] 2. The stator core A section and the stator core B section with different numbers of oil channels are combined to form the staggered stator oil circuit, thereby effectively reducing the local heat accumulation; in addition, the shape of the oil channel can be graded according to the cooling requirement, the gradually tapered oil channel with a wide inlet and a narrow outlet enhances the flow speed of the cooling oil, and the flow speed is more uniform.

[0015] 3. The side core section divides the oil channels into an upper area and a lower area in the horizontal direction, the oil channels in the upper area are densely distributed, thereby enhancing the heat dissipation effect of the upper end of the stator core section and the winding; the lower area of the side core section cooperates with the characteristic that the winding is immersed in the cooling oil, and adopts a sparse oil channel layout mode, thereby weakening the redundancy of the lower end of the winding for heat dissipation and improving the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an oil circuit circulation schematic diagram of the present application.

[0017] Figure 2A perspective view of the utility model.

[0018] Figure 3 A perspective view of the intermediate iron core section.

[0019] Figure 4 A perspective view of the side iron core section.

[0020] Figure 5 A perspective view of the stator iron core A section.

[0021] Figure 6 A perspective view of the stator iron core B section.

[0022] In the drawing, reference numerals are: casing 10, oil inlet 11, oil outlet 12; rotor assembly 20; stator iron core assembly 30, winding 31, stator iron core section 32, intermediate iron core section 321, side iron core section 322, upper area 3221, lower area 3222, stator iron core A section 323, stator iron core B section 324, oil channel 33, welding groove 34; oil sump 40, cooling oil 41, oil filter 42, oil pump 43, heat exchanger 44. DETAILED DESCRIPTION

[0023] The specific embodiment of the utility model will be described below with reference to the drawings.

[0024] In the description of the utility model, it should be explained that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer", "horizontal", "vertical", "top", "bottom" appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as the limitation of the utility model.

[0025] Referring to Figure 1 and Figure 2 A stator heat dissipation structure of an oil-cooled motor, comprising a stator iron core assembly 30 arranged in an oil-cooled motor cooling system. Specifically, the oil-cooled motor cooling system comprises a casing 10, the casing 10 is provided with an oil inlet 11 and an oil outlet 12, the stator iron core assembly 30 is arranged in the casing 10, and the stator iron core assembly 30 comprises a winding 31 and a stator iron core section 32 sleeved on the winding 31. In the embodiment, a rotor assembly 20 is further arranged in the casing 10, an oil sump 40 for containing cooling oil 41 is arranged below the oil outlet 12 of the casing 10, and the oil sump 40 is sequentially connected with an oil filter 42, an oil pump 43 and a heat exchanger 44.

[0026] Referring to Figures 2 to 6The stator core segment 32 is composed of four stampings, i.e., the middle core segment 321, the stator core A segment 323, the stator core B segment 324, and the side core segment 322. Specifically, in the embodiment, the middle core segment 321 is circumferentially provided with 70 oil channels 33, the stator core B segment 324 is circumferentially provided with 70 oil channels 33, the stator core A segment 323 is circumferentially provided with 60 oil channels 33, and the side core segment 322 is provided with 42 oil channels 33; the stator core segment 32 takes the middle core segment 321 as the symmetry axis, and the stator core B segment 324 and the stator core A segment 323 are arranged alternately on both sides of the middle core segment 321, and the side core segment 322 is arranged at the outermost sides. The oil inlet 11 of the casing 10 is arranged vertically above the ground and corresponds to the oil channels 33 of the middle core segment 321, the inner diameter of the middle core segment 321 is smaller than the inner diameter of the casing 10, and the oil outlet 12 is arranged vertically below the ground.

[0027] With reference to Figures 1 to 6 Specifically, the middle core segment 321 can be provided with one or two according to actual needs, and the stator core B segment 324 and the stator core A segment 323 arranged alternately on both sides of the middle core segment 321 can also be provided with a number according to actual length. In the embodiment, the stator core segment 32 takes one middle core segment 321, and two groups of the stator core B segment 324 and the stator core A segment 323 are arranged alternately on both sides, and the outermost stator core A segment 323 is connected with the side core segment 322. Among them, the middle core segment 321 is directly connected with the oil inlet 11 of the casing 10, and the stator core A segment 323, the stator core B segment 324, and the side core segment 322 are respectively in interference fit with the casing 10.

[0028] With reference to Figures 1 to 6, the stator core A section 323, the stator core B section 324 and the side core section 322 are respectively provided with welding grooves 34, and the assembly is completed by welding in the welding grooves 34. After the plurality of stator punching sheets are stacked, the oil channels 33 in the stator punching sheets form the interlaced stator oil path. The oil channel 33 of the middle core section 321 is directly connected with the oil inlet 11 of the casing 10, the cooling oil 41 enters from the oil inlet 11, enters the oil channel 33 of the middle core section 321, then flows through the oil channel 33 in the stator core B section 324, and then flows through the oil channel 33 in the stator core A section 323 and the side core section 322, and then flows out from the oil channel 33 of the side core section 322 to the casing 10, and is received by the oil pan 40 arranged below the casing 10. In the embodiment, the cooling oil 41 flows from the 70 oil channels 33 of the stator core B section 324 to the 60 oil channels 33 of the stator core A section 323, and then flows from the 60 oil channels 33 of the stator core A section 323 to the 42 oil channels 33 of the side core section 322, and then flows through the oil channel 33 of the side core section 322 to the winding 31, thereby providing heat exchange for the winding 31. The flow path of the cooling oil 41 forms a circulating oil path in the stator, and the number of the oil channels 33 gradually increases from more to less, and the shape changes from dispersion to convergence and then to dispersion, thereby expanding the contact area between the cooling oil 41 and the stator core, effectively reducing the local heat accumulation, and improving the heat dissipation efficiency.

[0029] With reference to Figure 1 and Figure 4 , the 42 oil channels 33 of the side core section 322 are divided into an upper area 3221 and a lower area 3222 in the horizontal direction. The 24 oil channels 33 are distributed in the upper area 3221, and the arrangement is relatively dense, thereby enhancing the heat dissipation effect on the upper end of the stator core section 32 and the winding 31. The 18 oil channels 33 are distributed in the lower area 3222, and the arrangement is relatively sparse, thereby cooperating with the feature that the lower end of the winding 31 is immersed in the cooling oil 41, weakening the redundancy of the heat dissipation of the lower end of the winding 31, and improving the work efficiency.

[0030] With reference to Figures 2 to 6 , the oil channels 33 in the stator core section 32 form the interlaced stator oil path by the arrangement and stacking of the four kinds of punching sheets. The shape of the oil channel 33 can be rectangular, circular or waist-shaped, etc. Specifically, in the embodiment, several kinds of punching sheets can be selected from the punching sheets constituting the stator core section 32. In the embodiment, the middle core section 321 and the side core section 322 are preferably selected, the oil channel 33 is designed as a gradually changing oil channel 33 with a wide inlet and gradually narrowing outlet, thereby enhancing the flow speed of the cooling oil 41 and making the flow area more uniform. The diameter of the oil channel 33 can be graded according to the specific cooling requirement, the wider oil channel 33 is used at the connection with the oil inlet 11, and gradually narrows to the connection with the oil outlet 12, thereby promoting the higher flow speed of the cooling oil 41, and effectively improving the heat exchange capacity. In addition, when the oil channel 33 is arranged, the position of the oil channel 33 can be finely adjusted to avoid the overlapping of the oil channels 33, and to ensure the smooth flow of the cooling oil 41.

[0031] Referring to Figures 1 to 6 In specific implementation, the oil inlet 11 and the oil outlet 12 on the shell 10 can be changed in quantity and / or position according to the simulated temperature rise value or the measured temperature rise value of the oil-cooled motor, the middle core section 321 can be changed in position or quantity in the stator core assembly 30, and the oil channels 33 of the four kinds of stampings can be adjusted in quantity and position according to the simulated temperature rise value or the measured temperature rise value of the oil-cooled motor, so that the flexibility is high, and the heat dissipation requirements of oil-cooled motors of various specifications can be adapted.

[0032] The above is only a specific implementation manner of the present application, but the design concept of the present application is not limited thereto, and any non-substantial change of the present application by using the concept should belong to the act of infringing the protection scope of the present application.

Claims

1. A stator heat dissipation structure of an oil-cooled electric machine, characterized by: The application relates to a stator core assembly arranged in an oil-cooled motor cooling system, wherein the stator core assembly comprises windings and stator core segments arranged on the windings, and the stator core segments are composed of at least one intermediate core segment, a plurality of stator core A segments, a plurality of stator core B segments and two side core segments; the intermediate core segment, the stator core A segment, the stator core B segment and the side core segment are respectively provided with a plurality of oil channels for cooling oil flowing through; the number of the oil channels of the stator core A segment is different from that of the stator core B segment.

2. The stator heat dissipation structure of an oil-cooled electric machine according to claim 1, characterized in that: The oil-cooled motor cooling system further comprises a casing provided with an oil inlet and an oil outlet, and the stator core assembly is arranged in the casing; the stator core segments take the intermediate core segment as a symmetric axis, the stator core A segments and the stator core B segments are arranged on the two sides of the intermediate core segment in a staggered mode, and the side core segments are arranged on the outermost sides; the oil channels of the intermediate core segment are connected with the oil inlet of the casing, and the stator core A segments, the stator core B segments and the side core segments are respectively in interference fit with the casing.

3. The stator heat dissipation structure of an oil-cooled electric machine according to claim 2, characterized in that: The number of the oil channels in the stator core B segment is larger than that in the stator core A segment, and the plurality of oil channels in the stator core segments are composed of the side core segments, the stator core A segments, the stator core B segments and the intermediate core segment in a staggered mode through lamination and welding.

4. The stator heat dissipation structure of an oil-cooled electric machine according to claim 1, characterized in that: The oil channels of the side core segments are divided into an upper area and a lower area in the horizontal direction, the number of the oil channels distributed in the upper area is larger than that in the lower area, and the arrangement of the oil channels in the upper area is denser than that in the lower area.

5. The stator heat sink structure of an oil-cooled electric machine according to claim 1, characterized by: The shape of the oil channels of the intermediate core segment or the side core segment or the stator core A segment or the stator core B segment is a gradually-changing oil channel with a gradually-narrowing inlet and a gradually-narrowing outlet.

6. The stator heat sink structure of an oil-cooled electric machine according to claim 1, characterized by: The shape of the oil channels is rectangular, circular or waist-shaped.

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