Oil-cooled motor stator structure and motor thereof

Abstract

The invention relates to an oil-cooled motor stator structure which comprises a winding and a stator core, the winding is inserted in the stator core, a cooling sleeve is arranged outside the stator core, a plurality of annular oil ways are arranged in the cooling sleeve, each annular oil way rotates in a reciprocating mode in the axial direction, and the adjacent annular oil ways are communicated with each other. A plurality of oil spraying holes are evenly formed in the outer edges of the two end faces of the cooling sleeve at intervals, the oil spraying holes are distributed in an arc shape, the included angle between the oil spraying holes in the two arc-shaped ends and the circle center ranges from 60 degrees to 180 degrees, and the annular oil ways at the two ends communicate with the oil spraying holes. According to the invention, the cooling sleeve is arranged outside the stator iron core, the annular oil ways rotating in a reciprocating manner along the axial direction are arranged in the cooling sleeve, oil is finally sprayed out from the oil spraying holes, the annular oil ways increase the heat exchange area of the stator iron core, the heat dissipation efficiency is high, and meanwhile, the stator structure is a novel structure with low cost and balanced cooling of the end part; the upper and lower oil distribution paths in the shell can be adjusted by changing the oil inlet, so that the flow resistance difference is reduced, the spraying effect is good, and the adaptability is more flexible.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to an oil-cooled motor stator structure and a motor thereof. Background Art

[0002] New energy vehicle drive motors pursue high power, low cost, and high reliability, and there are more and more solutions for oil-cooled flat wire motors; currently common stator oil circuits include oil pipe spray, end oil guide ring spray, stator core spray, etc.; the current common stator core spray solution can better achieve cooling of the core and end windings, reduce the temperature of the corresponding position, and improve the overall reliability of the motor; with the industry's continuous deepening of research on stator spray cooling and the increasingly fierce competition in the automotive industry, on the basis of the requirement for unchanged stator cooling effect, more stringent requirements are put forward for the cost of cooling solutions. The traditional solution of using stator end oil guide plates or oil rings has significantly increased the material cost and labor cost of oil-cooled motors due to the addition of structural parts such as oil ring body injection molding, front and rear sealing O-rings, etc., so there is an urgent need for a more novel stator end spray cooling solution that can reduce costs.

[0003] In the above context, the stator core end spraying solution has received widespread attention; the current disadvantages of the stator core spraying solution are: First, a single design is difficult to be compatible with the flexible adjustment of the oil inlet position of the vehicle. Due to different application scenarios, the oil inlet position often changes, and the corresponding oil outlet flow resistance will change significantly. Experiments have shown that the flow resistance will change by 50-60%! It has a very large impact on the core spraying results! This means that a fixed and optimized stator oil circuit is difficult to achieve platform-based application, which increases the product development cycle and mold cost; second, for the stator core spraying solution, there are usually many types of stator core punchings and high process costs. At the same time, due to the large number of core openings and complex shapes, it will have an adverse effect on the electromagnetic performance; the above problems have become one of the key issues that currently limit the application of stator core spraying solutions in the field of low-cost and high-efficiency motors, and in-depth analysis and optimization are urgently needed! Summary of the invention

[0004] In order to solve the above technical problems, the first purpose of the present invention is to provide an oil-cooled motor stator structure, which has low cost, large heat exchange area, high heat dissipation efficiency and more flexible adaptability; the second purpose of the present invention is to provide a motor.

[0005] In order to achieve the above first invention objective, the present invention adopts the following technical solutions:

[0006] An oil-cooled motor stator structure comprises a winding and a stator core, wherein the winding is inserted in the stator core, a cooling jacket is further provided outside the stator core, a plurality of annular oil paths are provided inside the cooling jacket, each annular oil path reciprocates along an axial direction, adjacent annular oil paths are interconnected, a plurality of oil spray holes are evenly spaced on the outer edges of both end surfaces of the cooling jacket, the plurality of oil spray holes are arranged in an arc shape, and the angles between the oil spray holes at both ends of the arc and the center of the circle are 60° to 180°, and the annular oil paths at both ends are connected to the oil spray holes.

[0007] As a preferred embodiment, the cooling sleeve includes an annular oil channel core, a notch is provided on the side wall of the oil channel core, and a plurality of oil channel holes extending axially are arranged at intervals along the circumferential direction of the oil channel core. The oil channel holes of two adjacent oil channel cores are staggered with each other so that all the oil channel holes and the notch are interconnected to form an annular oil circuit.

[0008] As a preferred solution, a notch is provided on each oil channel iron core, and the notches on two adjacent oil channel iron cores are spaced 180° apart.

[0009] As a preferred solution, an oil channel shunt punch is provided every two oil channel cores in the cooling jacket, and a shunt hole is provided on the oil channel shunt punch, so that two adjacent annular oil channels are connected.

[0010] As a preferred solution, the diversion holes on the plurality of oil channel diversion punching sheets are arranged in a staggered manner.

[0011] As a preferred solution, the flow diversion holes on two adjacent oil channel flow diversion punching plates are spaced 180 degrees apart.

[0012] As a preferred embodiment, the cooling sleeve also includes an end face oil-spraying iron core punching sheet, the oil spraying holes are arranged on the end face oil-spraying iron core punching sheet, and a plurality of long holes and a plurality of short holes are also arranged on the end face oil-spraying iron core punching sheet, and a plurality of end face oil-spraying iron core punching sheets are deflected and stacked with each other to form an end face oil-spraying iron core, so that the coolant can only be sprayed out from the oil spraying holes of the end face oil-spraying iron core.

[0013] As a preferred solution, the stator core and the cooling jacket are integrally formed, and are both formed by stacking a plurality of punching sheets.

[0014] In order to achieve the above second invention object, the present invention adopts the following technical solution:

[0015] A motor comprises a housing, an end cover, a stator and a rotor, wherein the stator is fixed in the housing, the rotor is arranged in the stator, and the two ends are rotatably connected to the housing and the end cover respectively, the stator is as described in any one of the above items, and the housing is also provided with a coolant inlet, which is connected to an annular oil circuit.

[0016] As a preferred solution: oil baffle rings are further provided at both ends of the shell, and positions on the oil baffle rings corresponding to the oil injection holes extend inwards to form oil baffle plates.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention arranges a cooling jacket outside the stator core, and arranges a plurality of annular oil paths in the cooling jacket that reciprocate along the axial direction, and finally sprays out from the oil spray hole. The annular oil paths increase the heat exchange area of ​​the stator core, and the heat dissipation efficiency is high. At the same time, the stator structure is a new structure with low cost and balanced end cooling. By changing the oil inlet, the upper and lower oil distribution paths inside the shell can be adjusted to reduce the flow resistance difference, the spray effect is good, and the adaptability is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0020] Figure 1 It is a structural schematic diagram of the stator and the housing of the present invention;

[0021] Figure 2 It is a schematic diagram of the exploded structure of the stator and the housing of the present invention;

[0022] Figure 3 It is a partial structural schematic diagram of the stator and housing of the present invention;

[0023] Figure 4 It is a partial structural schematic diagram of the housing and the oil retaining ring of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the stator core and the cooling jacket of the present invention;

[0025] Figure 6 It is a schematic diagram of the exploded structure of the stator core and the cooling jacket of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the end-face oil-sprayed iron core punching sheet of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the oil channel core of the present invention;

[0028] Fig. 9 is a schematic diagram of the flow area of ​​the coolant in the cooling jacket of the present invention;

[0029] Fig.10 It is a schematic diagram of the flow area of ​​the coolant between the three oil channel splitting punches of the present invention;

[0030] Fig.11It is a distribution diagram of three oil channel flow diversion punching plates of the present invention;

[0031] Fig.12 It is another distribution schematic diagram of the three oil channel flow diversion punching plates of the present invention;

[0032] The accompanying drawings are marked as follows: 1. stator core; 2. winding; 3. cooling jacket; 30. coolant inlet pipe; 31. end face oil-spraying core punching sheet; 311. oil-spraying hole; 312. long hole; 313. short hole; 32. oil channel core; 320. coolant flow basin; 321. notch; 322. oil channel hole; 33. oil channel diverter punching sheet; 331. diverter hole; 4. housing; 40. coolant inlet; 41. oil retaining ring; 410. oil retaining sheet; 5. three-phase lead wires. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0040] like Figures 1 to 8 As shown, a motor includes a housing 4, an end cover, a stator and a rotor, wherein the stator is fixed in the housing 4, the rotor is arranged in the stator, and the two ends are rotatably connected to the housing 4 and the end cover respectively, the stator includes a winding 2 and a stator core 1, the winding 2 is inserted in the stator core 1, the winding is formed by connecting a plurality of flat wire conductors, and the winding is led out at one end of the stator core 1 through a bus flat wire and a three-phase lead wire 5.

[0041] A cooling jacket 3 is further provided outside the stator core 1, and a plurality of annular oil circuits are provided inside the cooling jacket 3. Each annular oil circuit reciprocates axially, and adjacent annular oil circuits are interconnected. A plurality of oil injection holes 311 are evenly spaced at outer edges of both end surfaces of the cooling jacket 3. The plurality of oil injection holes 311 are arranged in an arc shape, and the angles between the oil injection holes 311 at both ends of the arc and the center of the circle are 60° to 180°, and the annular oil circuits at both ends are connected to the oil injection holes 311.

[0042] The housing 4 is also provided with a coolant inlet 40, which is in communication with the annular oil path. A coolant inlet pipe 30 may also be provided in the coolant inlet 40. Oil baffle rings 41 are also provided at both ends of the housing 4, and the position of the oil baffle ring 41 corresponding to the oil injection hole 311 extends inward to form an oil baffle sheet 410.

[0043] The implementation method of the oil deflector at the front and rear ends of the housing is as follows: 1. The normal housing thickness is thickened during the initial design, and then the excess thickness is milled off by lathe (the excess part is the position where the stator core is installed with interference fit), and at the same time, the corresponding oil deflector shape and size are machined at the required position by lathe;

[0044] 2. In addition to the traditional original shell and core interference assembly process, the oil retaining ring parts are processed separately. The material can be aluminum alloy, injection molding material, silicon steel sheet waste, etc., and then installed at the required position by interference fit or glue fixation and curing.

[0045] The present invention forms an oil deflector ring 41 by adjusting the convex rib at the stop of the shell 4 or adding an SMC injection molded baffle. The oil deflector ring and the oil deflector sheet are flexible in shape, and can effectively shield the oil sprayed on the end surface of the stator core and perform secondary oil separation, thereby saving the end oil guide components, being simple to implement, having low processing cost, and having good spraying effect.

[0046] The cooling jacket includes an annular oil channel core 32, and a notch 321 is provided on the side wall of the oil channel core 32. The oil channel core 32 is provided with a plurality of oil channel holes 322 extending axially at intervals along the circumferential direction. The oil channel holes 322 of two adjacent oil channel cores 32 are staggered with each other so that all the oil channel holes 322 and the notches are interconnected to form an annular oil path. A notch 321 is provided on each oil channel core 32, and the notches 321 on two adjacent oil channel cores 32 are spaced 180° apart. The coolant inlet 40 or the coolant inlet pipe 30 is connected to the notch 321 in the middle. An oil channel diverter punch 33 is also provided for every two oil channel cores 32 in the cooling jacket 3, and a diverter hole 331 is provided on the oil channel diverter punch 33. The diverter hole 331 connects two adjacent annular oil paths. The coolant flow domain 320 formed by the annular oil path is as shown in FIG. Fig. 9 and Fig.10 shown.

[0047] like Fig.11 As shown, the diversion holes 331 on the multiple oil channel diversion punches 33 are mutually staggered; as a preferred solution, the diversion holes 331 on two adjacent oil channel diversion punches 33 are spaced 180° apart. The oil spray hole is set in the upper half of the stator core. When the coolant flows in from the gap of the oil channel core 32 in the middle, the two oil channel diversion punches 33 on both sides of the three oil channel diversion punches 33 have diversion holes 331 in the lower part, and the middle oil channel diversion punch 33 has a diversion hole 331 in the upper part, so that the coolant is axially diverted from the lower part of the cooling jacket, and as the coolant slowly fills the lower half of the cooling jacket, it is sprayed out from the oil spray hole on the upper part of the cooling jacket; this structure is a large flow resistance solution, and the oil outlet speed corresponding to the core end face is small, which is suitable for motor solutions with small end dimensions.

[0048] like Fig.12As shown, when the coolant flows in from the gap of the oil channel core 32 in the middle, two of the three oil channel diversion punches 33 have diversion holes 331 at the top, and the middle oil channel diversion punch 33 has a diversion hole 331 at the bottom. In this way, the coolant is axially diverted from the upper part of the cooling sleeve. When the coolant fills the annular oil path in the middle part, it can be diverted from the two upper diversion holes and then directly sprayed out from the oil injection hole at the top of the cooling sleeve. This structure is a small flow resistance solution, and the oil outlet speed corresponding to the end face of the core is large, which is suitable for motor solutions with large end dimensions.

[0049] The above structure can adapt to the adjustment of the oil inlet position of the client to the greatest extent. The number, size and spatial distribution of the axial series and parallel oil holes can be adjusted according to the oil inlet position, and then the flow resistance of the entire oil circuit can be adjusted to meet the distribution of spray oil at the front and rear ends.

[0050] The novel spiral "Z"-shaped oil channel flow field in the present invention can flexibly adapt to changes in external oil pressure, adjust the number of parallel Z-shaped oil channels, and has the following characteristics: 1. The structure has a relatively small overall flow resistance, a large heat exchange area, and a high heat dissipation efficiency. The oil channels can be located at the outer diameter of the stator core yoke of the machine to avoid deterioration of the electromagnetic performance and iron loss of the motor; 2. The structure proposed in the present invention has little effect on the silicon steel sheet itself and the electromagnetic performance while effectively cooling the stator components of the motor; it takes into account both cooling and electromagnetic performance to the greatest extent; at the same time, there are fewer silicon steel sheet types and molds, and the process cost is more advantageous.

[0051] The cooling sleeve of the present invention also includes an end face oil-spraying iron core punching sheet 31, the oil-spraying hole 311 is arranged on the end face oil-spraying iron core punching sheet 31, and a plurality of long holes 312 and a plurality of short holes 313 are also arranged on the end face oil-spraying iron core punching sheet 31. The plurality of end face oil-spraying iron core punching sheets 31 are mutually deflected and stacked to form an end face oil-spraying iron core, and the coolant in the annular oil circuit can only be sprayed out from the oil-spraying hole 311 of the end face oil-spraying iron core.

[0052] The stator core 1 and the cooling jacket 3 are integrally formed, and are both formed by stacking a plurality of punching sheets. The stator core can realize a very flexible oil circuit series-parallel structure with only three punching sheets, realize a "Z"-shaped oil channel, with adjustable flow resistance, large heat exchange area, and high heat dissipation efficiency; it can better adapt to flexible and changeable customer boundary adjustments, and only needs to adjust the spatial position of the axial oil holes between the punching sheets accordingly to realize effective spraying of the oil.

[0053] The low-cost, highly compatible new "Z"-shaped stator oil circuit proposed in the present invention not only has a flexible oil inlet position, but can also conveniently adjust the upper and lower oil distribution paths inside the shell to reduce the flow resistance difference and achieve a good spraying effect; the iron core punching sheets of the present invention are flexible in combination, and the "Z"-shaped oil channel is relatively flexible in adjustment.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An oil-cooled motor stator structure, comprising a winding (2) and a stator core (1), wherein the winding (2) is inserted into the stator core (1), characterized in that: A cooling jacket (3) is further provided outside the stator core (1), and a plurality of annular oil circuits are provided inside the cooling jacket (3), each annular oil circuit reciprocates in the axial direction, and adjacent annular oil circuits are interconnected. A plurality of oil spray holes (311) are evenly spaced at the outer edges of the two end surfaces of the cooling jacket (3), and the plurality of oil spray holes (311) are arranged in an arc shape, and the angle between the oil spray holes (311) at the two ends of the arc and the center of the circle is 60° to 180°, and the annular oil circuits at the two ends are connected to the oil spray holes (311).

2. The oil-cooled motor stator structure according to claim 1, characterized in that: The cooling sleeve comprises an annular oil channel core (32), a notch (321) is provided on the side wall of the oil channel core (32), a plurality of oil channel holes (322) extending axially are arranged at intervals along the circumferential direction of the oil channel core (32), and the oil channel holes (322) of two adjacent oil channel cores (32) are arranged in a staggered manner so that all the oil channel holes (322) and the notch are interconnected to form an annular oil path.

3. The oil-cooled motor stator structure according to claim 3, characterized in that: A notch (321) is provided on each oil channel iron core (32), and the notches (321) on two adjacent oil channel iron cores (32) are spaced 180 degrees apart.

4. The oil-cooled motor stator structure according to claim 3, characterized in that: An oil channel flow splitting punch (33) is also provided every two oil channel iron cores (32) in the cooling jacket (3), and a flow splitting hole (331) is provided on the oil channel flow splitting punch (33). The flow splitting hole (331) enables two adjacent annular oil channels to communicate with each other.

5. The oil-cooled motor stator structure according to claim 5, characterized in that: The flow diversion holes (331) on the plurality of oil channel flow diversion punching sheets (33) are arranged in a staggered manner.

6. The oil-cooled motor stator structure according to claim 5, characterized in that: The flow diversion holes (331) on two adjacent oil channel flow diversion punching sheets (33) are spaced 180 degrees apart.

7. The oil-cooled motor stator structure according to claim 1, characterized in that: The cooling sleeve also includes an end face oil-spraying iron core punch (31), the oil-spraying hole (311) is arranged on the end face oil-spraying iron core punch (31), and the end face oil-spraying iron core punch (31) is also provided with a plurality of long holes (312) and a plurality of short holes (313), and the plurality of end face oil-spraying iron core punches (31) are mutually deflected and stacked to form an end face oil-spraying iron core, so that the coolant can only be sprayed out from the oil-spraying hole (311) of the end face oil-spraying iron core.

8. An oil-cooled motor stator structure according to any one of claims 1 to 7, characterized in that: The stator core (1) and the cooling jacket (3) are integrally formed and are both formed by stacking a plurality of punching sheets.

9. A motor, comprising a housing (4), an end cover, a stator and a rotor, wherein the stator is fixed in the housing (4), the rotor is arranged in the stator, and the two ends of the rotor are rotatably connected to the housing (4) and the end cover respectively, characterized in that: The stator is as described in any one of claims 1 to 8, wherein the housing (4) is further provided with a coolant inlet (40), and the coolant inlet (40) is communicated with an annular oil circuit.

10. The motor according to claim 9, characterized in that: Oil deflector rings (41) are also provided at both ends of the housing (4), and positions on the oil deflector rings (41) corresponding to the oil injection holes (311) extend inwards to form oil deflector plates (410).

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