Motor oil cooling structure and motor

Abstract

The invention discloses a motor oil cooling structure and a motor, and belongs to the technical field of motors, the motor oil cooling structure comprises a stator core, a stator winding, an insulating material and an oil guide piece, the stator core comprises at least two stator core sections, stator grooves extending in the axial direction are formed in the inner periphery of each stator core section at intervals, and the stator winding is wound around the stator grooves; comprising a conductor located in a stator groove, an insulating material is arranged in the stator groove in a sleeved mode and located between the inner wall of the stator groove and the conductor, an oil guide channel is formed between the insulating material and the conductor in the axial direction, an oil guide piece is axially clamped between two adjacent stator iron core sections, and an oil guide structure is arranged on the oil guide piece. The oil guide structure forms an oil guide cavity between two adjacent stator core sections, and the oil guide cavity is communicated with the oil guide channel. The motor oil cooling structure solves the problem that a motor oil cooling structure is poor in cooling effect, and the effects of being good in cooling effect, simple in structure, capable of saving the internal space of a motor and beneficial to motor miniaturization are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor oil cooling structure and a motor. Background Art

[0002] At present, the motors of new energy vehicles usually use oil grooves or oil holes in the stator yoke, and the oil flows in the stator yoke oil groove, and then the oil is collected and sprayed to the cooling structure on the end winding through the oil spray ring on the side of the stator end winding. The oil flowing through the yoke oil groove can take away the heat of the stator core, and the oil spraying through the end oil spray ring can take away the heat of the end winding, thereby achieving motor cooling. However, in the above cooling structure, the stator yoke oil groove is far away from the main heat source, that is, the motor copper wire, and the cooling effect of the copper wire in the cooling groove is poor; and the stator winding is usually a multi-layer structure, and the oil spray ring has a good cooling effect only on the outermost winding, and a poor cooling effect on the inner or middle layer winding. Summary of the invention

[0003] The main purpose of the present application is to provide a motor oil cooling structure and a motor, aiming to solve the technical problem of poor cooling effect of the motor oil cooling structure in the related art.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] In a first aspect, the present application proposes a motor oil cooling structure, comprising:

[0006] A stator core, the stator core comprising at least two stator core segments, the inner peripheries of the stator core segments being provided with stator slots extending in the axial direction at intervals;

[0007] stator windings, the stator windings are wound around the stator slots, and include conductors located inside the stator slots;

[0008] Insulating material, the insulating material is sleeved inside the stator slot and located between the inner wall of the stator slot and the conductor, and an oil guide channel is formed between the insulating material and the conductor along the axial direction;

[0009] The oil guide member is axially clamped between two adjacent stator core segments. The oil guide member is provided with an oil guide structure. The oil guide structure forms an oil guide cavity between the two adjacent stator core segments. The oil guide cavity is communicated with the oil guide channel.

[0010] Optionally, in the above motor oil cooling structure, the inner ring of the oil guide member is a closed structure, and the closed structure is sealed and connected to two adjacent stator core segments respectively.

[0011] Optionally, in the above motor oil cooling structure, the oil guide member is a split structure, including an outer frame and an inner ring, the oil guide cavity is formed in the inner ring, and an oil guide channel is provided between the outer frame and the inner ring.

[0012] Optionally, in the above motor oil cooling structure, the inner ring is a plastic structure.

[0013] Optionally, in the above motor oil cooling structure, the plastic structure includes a sealing ring and a supporting portion arranged outside the sealing ring, and a plurality of pillars are arranged on the supporting portion at intervals along the circumferential direction.

[0014] Optionally, in the above motor oil cooling structure, the projections of the support and the stator teeth of the stator core segment along the axial direction coincide with each other.

[0015] Optionally, in the above motor oil cooling structure, the distance between any two adjacent pillars is the width of one or more stator slots.

[0016] Optionally, in the above motor oil cooling structure, the connection method between the outer frame and the inner ring includes any one of welding, clamping or injection molding.

[0017] Optionally, in the above-mentioned motor oil cooling structure, a first positioning mark is provided on the outer frame, and a second positioning mark corresponding to the first positioning mark is provided on the stator core segment.

[0018] Optionally, in the above motor oil cooling structure, the inner ring of the outer frame is provided with a first buckle, and the outer ring surface of the inner ring is provided with a second buckle corresponding to the first buckle.

[0019] Optionally, in the above motor oil cooling structure, the outer diameter of the oil guide member is the same as the outer diameter of the stator core segment, and an oil channel is provided on the surface of the oil guide member.

[0020] Optionally, in the above motor oil cooling structure, oil passages are provided on the surface of the oil guide member and the surface of the stator core segment, and the oil passages of the oil guide member and the stator core segment are in the same straight line.

[0021] Optionally, in the above motor oil cooling structure, an oil through hole is provided on the oil guide member, and the oil through hole is communicated with the oil guide cavity.

[0022] Optionally, in the above motor oil cooling structure, the stator slots of the stator core segment adjacent to the oil guide member are closed slots; or,

[0023] The stator slots of a stator core segment on one side of the oil guide member are open slots, and the stator slots of another stator core segment on the other side of the oil guide member are closed slots.

[0024] Optionally, in the above motor oil cooling structure, the stator winding is wound with copper wire, and a gap is opened on the conductor along the length direction based on one or more sides of the cross section, and an oil channel is formed between the gap and the insulating material.

[0025] Optionally, in the above-mentioned motor oil cooling structure, the insulating material is integrated insulating paper, and a through hole is opened at a position corresponding to the oil guide part on the insulating paper, and the through hole is used to allow the cooling oil of the oil guide cavity to enter the oil guide channel and the oil channel.

[0026] In a second aspect, the present application also proposes a motor, comprising the motor oil cooling structure as described above.

[0027] The above one or more technical solutions provided by this application may have the following advantages or at least achieve the following technical effects:

[0028] The present application proposes an oil cooling structure for a motor and a motor. An oil guide member is sandwiched between two adjacent stator core segments, so that the oil guide structure arranged on the oil guide member forms an oil guide cavity between the two adjacent stator core segments, and an insulating material is sleeved inside the stator slot, between the inner wall of the stator slot and the conductor, so that an oil guide channel is formed between the insulating material and the conductor, and the oil guide cavity is connected to the oil guide channel; the cooling oil can first flow into the oil guide cavity, and then flow into the oil guide channels of the two stator core segments respectively, so that the cooling oil enters between the insulating material and the conductor. In this structure, the interior of the electronic core can be cooled through the oil guide cavity, and the main heat source of the motor, that is, the conductor wound inside the stator slot on the stator winding, can also be immersed and cooled through the oil guide channel to achieve direct cooling. Not only is the cooling effect good, but the structure is simple, and the internal space of the motor can be saved, which is conducive to the miniaturization of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 This is a structural schematic diagram of the first embodiment of the motor oil cooling structure of the present application;

[0031] Figure 2 for Figure 1 Exploded diagram of

[0032] Figure 3 for Figure 2 Schematic diagram of the structure of the stator core;

[0033] Figure 4 A schematic diagram of the insulating material of the first embodiment of the motor oil cooling structure of the present application;

[0034] Figure 5 This is an exploded view of the stator core structure of the second embodiment of the motor oil cooling structure of the present application;

[0035] Figure 6 for Figure 5 Exploded diagram of the structure of the intermediate oil guide;

[0036] Figure 7 for Figure 1 Schematic diagram of the cross section of the stator core at AA;

[0037] Figure 8 This is a schematic cross-sectional view of a stator slot of a second embodiment of the motor oil cooling structure of the present application;

[0038] Fig. 9 A schematic cross-sectional view of a conductor of a second embodiment of the motor oil cooling structure of the present application;

[0039] Fig.10 for Figure 1 Schematic diagram of the cross section at AA in the middle.

[0040] Description of Figure Numbers:

[0041] Label name Label name 10 chassis 11 Oil inlet 12 First oil outlet 13 Second oil outlet 20 Stator core 21 First stator core segment 22 Second stator core segment 23 Stator slot 24 Open slot 25 Closed slot 26 Oil inlet hole 27 Stator teeth 28 First positioning mark 29 Second positioning mark 30 Oil guide parts 31 Oil guide cavity 32 Bracket 33 Oil hole 34 Plastic structure 35 Sealing ring 36 Oil channel 37 First buckle 38 Second buckle 39 pillar 40 Stator winding 41 First winding end 42 Second winding end 43 conductor 44 Oil channel 50 Insulation Materials 51 First insulating material 52 Second insulating material 53 Insulation Paper 54 Through Hole 60 Three-phase copper busbar / /

[0042] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] It should be noted that in the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In the present application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a device or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a device or system. In the absence of further restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the device or system including the element. In the present application, unless otherwise clearly specified and limited, the terms "connect", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. In the present application, if there is a description involving "first", "second", etc., the description of "first", "second", etc. is only for descriptive purposes and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0045] An analysis of relevant technologies revealed that in current new energy vehicles, oil-cooled motors usually use oil grooves or oil holes in the stator yoke. Oil flows in the oil groove of the stator yoke, and then is collected by the oil spray ring on the stator end winding side and sprayed onto the cooling structure on the end winding. The oil flowing through the oil groove of the yoke can take away the heat of the stator core, and the oil spraying through the oil spray ring at the end can take away the heat of the end winding, thereby achieving motor cooling.

[0046] However, the above cooling structure has the following disadvantages:

[0047] 1. The oil groove of the stator yoke is far away from the main heat source of the motor, that is, the motor copper wire. The oil only flows in the oil groove, and the cooling oil cannot penetrate into the motor copper wire, resulting in poor cooling effect of the copper wire in the stator slot;

[0048] 2. The stator end needs an oil injection ring to assist in oil injection to cool the end winding. The addition of an oil injection ring makes the cooling structure more complicated;

[0049] 3. The stator winding is usually a multi-layer coil structure. When the oil injection ring sprays oil, only the outermost winding coil has a good cooling effect, and the cooling effect on the inner or middle layer winding coil is still poor;

[0050] 4. Opening an oil groove on the stator yoke requires ensuring the radial thickness of the stator core, which occupies radial space and is not conducive to the miniaturization of the motor.

[0051] In the related art, although there are some schemes for cooling the stator core by supplying oil from the middle of the stator core to the stator slots, since insulating paper is generally provided between the stator winding coil and the inner wall of the stator slot in the motor stator slot, the insulating paper is inserted into the stator slot to isolate the stator winding coil from the inner wall of the stator slot. Therefore, the cooling oil ultimately enters the area between the inner wall of the stator slot and the insulating paper. However, for the main heat source, that is, the motor copper wire in the inner layer or middle layer of the stator winding, the cooling effect is still poor.

[0052] In view of the technical problems that the motor oil cooling structure in the related art is complex in structure, occupies a large space and has a poor cooling effect, the present application provides a motor oil cooling structure and a motor, and the specific embodiments and implementation methods are as follows:

[0053] Embodiment 1

[0054] Reference Figures 1 to 4 This embodiment provides a motor oil cooling structure. The motor oil cooling structure can be applied to motors, such as new energy vehicle motors, mechanical equipment motors, etc., which are not limited here. Figure 1 This is a schematic diagram of the structure of the first embodiment of the motor oil cooling structure of the present application. Figure 2 for Figure 1 Exploded diagram of Figure 3 for Figure 2 Schematic diagram of the structure of the stator core. Figure 4 Schematic diagram of insulating material.

[0055] In this embodiment, the motor oil cooling structure is used to cool the motor. The motor may include a housing 10. The motor oil cooling structure is arranged in the housing 10 and may specifically include:

[0056] A stator core 20, the stator core 20 comprises at least two stator core segments, and stator slots 23 extending in the axial direction are arranged at intervals on the inner periphery of the stator core segments;

[0057] A stator winding 40 , the stator winding 40 is wound around the stator slot 23 , and includes a conductor 43 located inside the stator slot 23 ;

[0058] The insulating material 50 is sleeved inside the stator slot 23 and located between the inner wall of the stator slot 23 and the conductor 43. An oil guide channel is formed between the insulating material 50 and the conductor 43 along the axial direction;

[0059] The oil guide member 30 is axially sandwiched between two adjacent stator core segments. An oil guide structure is provided on the oil guide member 30. The oil guide structure forms an oil guide cavity 31 between the two adjacent stator core segments. The oil guide cavity 31 is connected to the oil guide channel.

[0060] Alternatively, if Figure 1 As shown, an oil inlet 11 is provided on the casing 10, the stator core 20 is arranged in the casing 10, and the oil guide member 30 is clamped in the middle of the stator core 20 in the axial direction, or clamped between two stator core segments. The axial lengths of the two stator core segments can be consistent or inconsistent, which is not limited here. The oil guide member 30 and the stator core 20 form an oil guide cavity 31, and the oil guide cavity 31 is connected to the oil inlet 11 to receive the cooling oil injected through the oil inlet 11.

[0061] like Figure 1 As shown, the housing 10 can be a cylindrical structure with both ends open, so that the housing 10 has an axial direction and a circumferential direction perpendicular to each other, and an oil inlet 11 is provided in the middle of the axial direction of the housing 10. The stator core 20 is arranged in the housing 1 and is interference-fitted with the inner wall of the housing 10 to ensure that the stator core 20 and the housing 10 are fixedly installed.

[0062] The stator core 20 also has an axial direction and a circumferential direction perpendicular to each other. The stator core 20 may include two or more stator core segments. The inner periphery of each stator core segment is provided with stator slots 23 extending in the axial direction at intervals. Stator teeth 27 are formed between two adjacent stator slots 23. Figure 2 As shown; in the axial direction, the oil guide member 30 is sandwiched between two adjacent stator core segments, and the inner wall of the oil guide member 30 can be sealed and connected with the inner wall of the stator core 20 by contacting, abutting, etc.

[0063] In one embodiment, if Figure 2 and Figure 3As shown, the stator core 20 may be an integral structure, with a slot in the circumferential direction in the middle of the axial direction thereof for clamping an oil guide member 30 to allow oil to flow into the stator slot 23 through the middle of the stator core 20 . At this time, if the slot of the oil guide member 30 is facing outward, the inner wall of the stator core 20 is integrated, and the outer peripheral wall of the oil guide member 30 can be aligned with and connected to the outer peripheral wall edges on both sides of the slot of the stator core 20 to form a sealed connection; if the slot is facing inward, the outer surface of the stator core 20 is integrated, the inner wall of the oil guide member 30 can be aligned with and connected to the inner wall edges on both sides of the slot, and the outer peripheral wall of the oil guide member 30 can abut against the outer peripheral wall of the stator core 20. At this time, because the stator core 20 and the inner wall of the casing 10 have an interference fit, an oil inlet hole 26 can also be provided on the stator core 20 corresponding to the oil inlet 11, so that the oil guide cavity 31 can be connected to the oil inlet 11 through the oil inlet hole 26, and the cooling oil can flow into the oil guide cavity 31 through the oil inlet 11 and the oil inlet hole 26.

[0064] In another embodiment, the stator core 20 can also be two completely isolated independent structures, and the oil guiding member 30 is sandwiched between the two independent structures, i.e., the two stator core segments mentioned above. At this time, the inner wall of the oil guiding member 30 is aligned with and connected to the inner wall edges of the two independent structures, and the outer peripheral wall of the oil guiding member 30 is also aligned with and connected to the outer peripheral wall edges of the two independent structures. The oil guiding member 30 and the stator core segments of the two independent structures form an oil guiding cavity 31.

[0065] Alternatively, if Figure 1 As shown, the stator winding 40 may include a first winding end 41 and a second winding end 42, and a first oil outlet 12 and a second oil outlet 13 are provided at the axial ends of the casing 10, the first oil outlet 12 corresponds to the first winding end 41, and the second oil outlet 13 corresponds to the second winding end 42.

[0066] The stator winding 40 is wound on the stator slot 23. The part of the stator winding 40 wound inside the stator slot 23 is defined as the conductor 43. At the two end surfaces of the stator core 20, there are wound stator windings 40 respectively, which are defined as two winding ends, namely the first winding end 41 and the second winding end 42. The conductor 43 is connected to the first winding end 41 and the second winding end 42 respectively.

[0067] like Figure 1 As shown, the first winding end 41 and the second winding end 42 respectively extend beyond the two ends of the stator core 20 and are located inside the casing 10. On one side wall of the casing 10, specifically on the side wall opposite to the side wall where the oil inlet 11 is located, there are provided two oil outlets, namely the first oil outlet 12 and the second oil outlet 13, which are respectively located at the two ends of the axial direction of the casing 10 and correspond to the positions of the first winding end 41 and the second winding end 42, respectively.

[0068] The insulating material 50 can be inserted into the stator slot 23 and sleeved on the inner side of the inner wall of the stator slot 23 to isolate the stator core 20 and the electronic winding 40, specifically separating the inner wall of the stator slot 23 from the conductor 43. At this time, the area between the insulating material 50 and the conductor 43 is the oil guide channel.

[0069] Alternatively, if Figure 4 FIG. 5 is a schematic diagram of an insulating material. The insulating material 50 may be a piece of integrated insulating material, the length of which is consistent with the length of the stator slot 23 of the entire stator core 20, and a through hole is provided in the middle portion corresponding to the oil guide member 30; Figure 2 As shown, the insulating material 50 can also be a segmented insulating material of two sections, including a first insulating material 51 and a second insulating material 52. The length of the first insulating material 51 is consistent with the axial length of the stator core segment on one side of the oil guide member 30, and the length of the second insulating material 52 is consistent with the axial length of the stator core segment on the other side of the oil guide member 30. At this time, the first insulating material 51 can be inserted into the stator slot 23 of the stator core segment on one side, and the second insulating material 52 can be inserted into the stator slot 23 of the stator core segment on the other side to completely isolate the stator core 20 from contact with the electronic winding 40 to achieve insulation.

[0070] Specifically, the insulating material 50 may be foamed insulating paper or other insulating materials, which serves to insulate the stator winding 40 from the stator core 20. After a plurality of stator punching sheets are stacked to form the stator core 20, insulating paper is inserted into the stator slot 23. Whether it is an integrated insulating paper with a hole in the middle or a segmented insulating paper set according to the length of the stator core segment, the cooling oil can enter the oil guide channel of the stator slot 23 from the oil guide cavity 31.

[0071] The oil guide member 30 is provided with an oil guide structure, which forms an oil guide cavity 31 between the oil guide member 30 and two adjacent stator core segments. The oil guide cavity 31 forms a circle of groove-shaped structures in the circumferential direction of the stator core 20, and the groove-shaped structure can communicate with the oil guide channel formed between the insulating material 50 and the conductor 43 in the stator slot 23 extending in the axial direction of the stator core 20. At the same time, the oil guide cavity 31 is communicated with the oil inlet 11 provided on the housing 10, and the cooling oil can flow into the oil guide cavity 31 through the oil inlet 11 to cool the inside of the electronic core 20, and then flow into the oil guide channels of the stator core segments on both sides of the oil guide cavity 31, so that the oil enters between the insulating material 50 and the conductor 43, and immerses and cools the main heat source of the motor, that is, the conductor 43 wound inside the stator slot 23 on the stator winding 40, so as to achieve direct cooling, so as to improve the cooling effect of the motor oil cooling structure.

[0072] The motor oil cooling structure not only has a good cooling effect, but also has a simple structure and can save internal space of the motor, which is conducive to the miniaturization of the motor.

[0073] In this embodiment, Figure 1 As shown, after the cooling oil flows into the oil guide cavity 31 in the middle of the stator core 20 through the oil inlet 11 at the top of the casing 10, the winding in the cooling oil guide cavity 31 is first soaked, and the inside of the stator core 20 is cooled, and then flows through the oil guide channel formed by the insulating material 50 and the conductor 43 in the stator slot 23. Here, the oil guide 30 is used to transport the oil from the middle of the stator core 20 to between the insulating material 50 and the conductor 43, and the conductor 43 in the stator slot 23 is cooled, so as to realize direct cooling of the stator winding 40, and the cooling effect is better; then, it is sprayed out from the stator slots at both ends of the stator core 20, enters the winding ends at both ends, and sprays and cools the first winding end 41 and the second winding end 42, so as to further improve the cooling effect, and finally flows out from the two oil outlets at the bottom of the casing 10, namely the first oil outlet 12 and the second oil outlet 13, to complete the motor oil cooling.

[0074] In an optional implementation manner of this embodiment, if Figure 1 and Figure 2 As shown, the motor to which the motor oil cooling structure is applied may also include:

[0075] The three-phase copper bar 60 can be connected to the first winding end 41 of the motor oil cooling structure.

[0076] The three-phase copper bar 60 is connected to one end of the stator winding 40. In the working state, the current enters from the three-phase copper bar 60, energizes the stator winding 40, and makes the motor run.

[0077] The motor oil cooling structure of the present embodiment adopts an oil guide member clamped between two adjacent stator core segments, so that the oil guide structure arranged on the oil guide member forms an oil guide cavity between the two adjacent stator core segments, and the insulating material is sleeved inside the stator slot, between the inner wall of the stator slot and the conductor, so that an oil guide channel is formed between the insulating material and the conductor, and the oil guide cavity is connected with the oil guide channel; the cooling oil can first flow into the oil guide cavity, and then flow into the oil guide channels of the two stator core segments respectively, so that the cooling oil enters between the insulating material and the conductor. In this structure, the inside of the electronic core can be cooled through the oil guide cavity, and the main heat source of the motor, that is, the conductor wound inside the stator slot on the stator winding, can also be immersed and cooled through the oil guide channel to achieve direct cooling, which not only has a good cooling effect, but also has a simple structure, and can save the internal space of the motor, which is conducive to the miniaturization of the motor.

[0078] Embodiment 2

[0079] Reference Figures 1 to 10 Based on the first embodiment, this embodiment further proposes a motor oil cooling structure. Figure 5 This is the structural explosion diagram of the stator core. Figure 6 This is the structural explosion diagram of the oil guide part. Figure 7 for Figure 1 Schematic diagram of the cross section of the stator core at AA. Figure 8 is a schematic diagram of the cross section inside the stator slot. Fig. 9 is a schematic diagram of the cross section of the conductor, Fig.10 for Figure 1 Schematic diagram of the cross section at AA in the middle.

[0080] Furthermore, the stator core 20 may include two stator core segments, namely a first stator core segment 21 and a second stator core segment 22 , and the oil guide member 30 is sandwiched between the first stator core segment 21 and the second stator core segment 22 .

[0081] like Figure 5 As shown, the stator core 20 includes a first stator core segment 21 and a second stator core segment 22, and the oil guide member 30 is sandwiched between the first stator core segment 21 and the second stator core segment 22. The first stator core segment 21, the oil guide member 30 and the second stator core segment 22 can be fixed together by welding, bonding or other connection methods. The inner wall of the oil guide member 30 can be in close contact with the inner wall of the first stator core segment 21 and the inner wall of the second stator core segment 22, and the outer peripheral wall of the oil guide member 30 directly abuts against the outer peripheral wall of the first stator core segment 21 and the outer peripheral wall of the second stator core segment 22 to form a complete stator structure. The stator slots 23 on the oil guide member 30 corresponding to the first stator core segment 21 and the second stator core segment 22 are also provided with through holes to facilitate the winding of the stator winding 40. The gap between the oil guide member 30 and the first stator core segment 21 and the second stator core segment 22 forms an oil guide cavity 31 .

[0082] In an optional implementation manner of this embodiment, the inner ring of the oil guide member 30 is a closed structure, and the closed structure is sealed and connected to two adjacent stator core segments respectively.

[0083] like Figure 5 As shown, the oil guide member 30 is sandwiched between the first stator core segment 21 and the second stator core segment 22, and the inner ring of the oil guide member 30 is sealed with the inner ring of the first stator core segment 21 and the inner ring of the second stator core segment 22 respectively to prevent cooling oil from entering the motor rotor through the air gap.

[0084] Furthermore, the oil guide member 30 may be a split structure, including an outer frame and an inner ring, the oil guide cavity is formed in the inner ring, and an oil guide channel is provided between the outer frame and the inner ring.

[0085] Specifically, there is a certain space between the inner ring of the oil guide member 30 and the outer frame, and the space and the gap between the first stator core segment 21 and the second stator core segment 22 form the oil guide cavity 31. An oil guide channel is formed between the insulating material 50 and the conductor 43, and the insulating material 50 will sequentially pass through the stator slot 23 of the first stator core segment 21, the oil guide cavity 31, and the stator slot 23 of the second stator core segment 22, so the oil guide channel will pass through the space between the outer frame and the inner ring.

[0086] Furthermore, the outer frame is a bracket 32 ​​, and the inner ring is a plastic structure 34 .

[0087] Furthermore, the connection method between the outer frame and the inner ring includes any one of welding, clamping or injection molding.

[0088] like Figure 6 As shown, the outer frame of the oil guide member 30 is a bracket 32, and the inner ring is a plastic structure 34. The bracket 32 ​​can be an annular structure, which is sleeved on the outer periphery of the plastic structure 34. The plastic structure 34 can be connected to the bracket 32 ​​by welding, clamping or injection molding. An oil hole 33 can be set on the bracket 32. The position of the oil hole 33 can correspond to the oil inlet 11 or the oil inlet hole 26 on the stator core 20, so that the oil guide cavity 31 can be connected with the oil inlet 11 through the oil hole 33, and the cooling oil can flow into the oil guide cavity 31 after passing through the oil inlet 11 and the oil hole 33. Alternatively, the oil guide cavity 31 can be connected with the oil inlet 11 through the oil hole 33 and the oil inlet hole 26, and the cooling oil can flow into the oil guide cavity 31 after passing through the oil inlet 11, the oil inlet hole 26 and the oil hole 33. Figure 6 As shown, the plastic structure 34 may be provided with openings for the winding copper wire to pass through, and the size of the openings is not limited.

[0089] In this embodiment, the inner ring of the oil guide member 30 is made of plastic material, and the insulating material 50 can adopt a non-integrated structure, so that when the insulating material 50 at the oil guide member 30 has gaps, the winding copper wire can also be insulated by the inner ring of the plastic material.

[0090] Furthermore, the plastic structure 34 includes a sealing ring 35 and a support portion arranged outside the sealing ring 35 , and a plurality of pillars 39 are arranged on the support portion at intervals along the circumferential direction.

[0091] Specifically, Figure 6 and Figure 7 As shown, the inner ring of the oil guide member 30 is a closed structure, that is, the plastic structure 34 is a closed structure, and a sealing ring 35 is arranged on the inner wall of the plastic structure 34 . The sealing ring 35 can be sealed with the inner ring of the first stator core segment 21 and the inner ring of the second stator core segment 22 .

[0092] In this embodiment, in order to ensure the stability of the plastic structure 34, as shown in FIG. Figures 5 to 7As shown, a plurality of pillars 39 may be spaced apart on the supporting ring of the plastic structure 34 to play a supporting role.

[0093] like Figure 6 and Figure 7 As shown, a sealing ring 35 can be arranged around the inner wall of the plastic structure 34 of the oil guide member 30. The sealing ring 35 is sealed with the inner wall of the stator core 20 to prevent excessive cooling oil from entering the rotor, resulting in failure to cool the main heat source, namely the stator winding 40.

[0094] Furthermore, the support column 39 coincides with the projection of the stator teeth 27 of the stator core segment in the axial direction.

[0095] Specifically, Figure 6 and Figure 7 As shown, when projected based on the axial direction of the stator core segment, the projection of the support 39 and the stator tooth 27 can overlap, preventing the support 39 from affecting the winding of the winding coil, and at the same time avoiding the support 39 from blocking the oil from entering the oil guide channel.

[0096] Furthermore, the distance between any two adjacent pillars 39 is equal to the width of one or more stator slots 23 .

[0097] Specifically, Figures 5 to 7 As shown, an opening is formed between two pillars 39 to pass an oil guide channel and a corresponding winding copper wire, or a larger opening is formed to pass multiple oil guide channels and a correspondingly larger number of winding copper wires. The pillars 39 can be evenly spaced in the circumferential direction on the outer surface of the sealing ring 35 to more stably support the plastic structure 34.

[0098] Optionally, the stator core 20 can be formed by stacking metal sheets such as silicon steel sheets or alloy steel sheets, and the bracket 32 ​​can also be formed by stacking metal sheets such as silicon steel sheets or alloy steel sheets that are the same or similar to the material of the stator core 20. Of course, it can also be made of other metals or non-metals, which are not limited here; the plastic structure 34 can be formed by an integral injection molding or potting process, and can be made of rubber or silicone material, has good toughness, and can meet the sealing requirements of the sealing ring 35 and the inner wall of the stator core 20.

[0099] Furthermore, a first positioning mark 28 is provided on the outer frame, and a second positioning mark 29 corresponding to the first positioning mark 28 is provided on the stator core segment.

[0100] Specifically, the first positioning mark 28 and the second positioning mark 29 may be positioning grooves or protrusions, which are used to calibrate the position of the oil guide member 30 and the stator core segment when installing the oil guide member 30 , so as to facilitate the installation and fixation of the oil guide member 30 .

[0101] like Figure 5As shown, three first positioning marks 28 are provided on the outer surface of the bracket 32, and the first positioning marks 28 are in the form of positioning grooves. Correspondingly, three second positioning marks 29 are provided on the outer surface of the first stator core segment 21, and three second positioning marks 29 are also provided on the outer surface of the second stator core segment 22, and the second positioning marks 29 are also in the form of positioning grooves. When it is necessary to stack the stator core metal sheets, on the basis of ensuring that the positioning grooves on each metal sheet in each stator core segment are aligned, when it is necessary to install the oil guide member 30, it is also ensured that the positioning grooves on the oil guide member 30 are aligned with the positioning grooves on the stator core segment, and the position of the oil guide member 30 is aligned with the stator core segment, so that the support 39 on the oil guide member 30 can also be overlapped with the projection of the stator teeth 27 of the stator core segment in the axial direction.

[0102] Furthermore, a first buckle 37 is disposed on the inner ring of the bracket 32 ​​, and a second buckle 38 corresponding to the first buckle 37 is disposed on the outer ring surface of the plastic structure 34 .

[0103] Specifically, Figure 6 As shown, the first buckle 37 and the second buckle 38 can form a female buckle, so that the bracket 32 ​​and the plastic structure 34 can be successfully connected. The first buckle 37 can be a female buckle such as a groove or a sub-buckle such as a protrusion, and the corresponding second buckle 38 can be a sub-buckle such as a protrusion or a female buckle such as a groove that matches the groove or the protrusion. Through the cooperation of the first buckle 37 and the second buckle 38, the bracket 32 ​​and the plastic structure 34 can be snapped together to form the oil guide 30, which is convenient and quick to install.

[0104] In an optional implementation manner of this embodiment, the outer diameter of the oil guide member 30 is the same as the outer diameter of the stator core segment, and an oil channel 36 is opened on the surface of the oil guide member 30 .

[0105] Specifically, Figure 3 and Figure 5 As shown, the outer diameter of the oil guide member 30 is the same as the outer diameter of the stator core segment, so that the oil guide member 30 can be firmly installed between the stator core segments and firmly in the housing 10. The cooling oil in the oil passage 36 can be dispersed into the gap between the stator core 20 and the housing 10 to cool the surface of the stator core 20.

[0106] Furthermore, oil passages 36 are provided on the surfaces of the oil guide member 30 and the stator core segment, and the oil passages 36 of the oil guide member 30 and the oil passages 36 of the stator core segment are on the same straight line.

[0107] Specifically, Figure 3 , Figure 5 and Figure 7As shown, a plurality of oil passages 36 are arranged at intervals in the circumferential direction of the surface of the stator core 20. The oil passages 36 on each stator core segment can be connected with the oil passages 36 on the oil guide member 30. The cooling oil entering through the oil inlet 11 can also enter these oil passages 36. The oil flowing through the oil passages 36 can take away the heat on the surface of the stator core 20, further increasing the cooling effect.

[0108] In an optional implementation manner of this embodiment, an oil through hole 33 is provided on the oil guide member 30 , and the oil through hole 33 is communicated with the oil guide cavity 31 .

[0109] Specifically, Figure 6 As shown, an oil hole 33 is provided on the bracket 32 ​​of the oil guide member 30, and an oil inlet 11 is provided on the casing 10. The position of the oil hole 33 corresponds to the oil inlet 11, so that the cooling oil enters the oil guide cavity 31 through the oil inlet 11 and the oil hole 33, and then enters the oil guide channel between the insulating material 50 and the conductor 43.

[0110] In an optional implementation manner of this embodiment, the stator slots 23 of the stator core segment adjacent to the oil guide member 30 are closed slots 25; or, the stator slots 23 of a stator core segment on one side of the oil guide member 30 are open slots 24, and the stator slots 23 of another stator core segment on the other side are closed slots 25.

[0111] Specifically, Figure 5 As shown, the stator slot 23 has two structures, an open slot 24 and a closed slot 25. In this embodiment, the stator slot 23 may include an open slot 24 or a closed slot 25. Since the insulating material 50 is located outside the conductor 43 in the stator slot 23, the cooling oil enters the oil guide channel and is located between the insulating material 50 and the conductor. Even if the stator slot 23 is an open slot 24, under the action of the insulating material 50, the oil will not enter the motor rotor too much. However, on both sides of the oil guide 30, since the insulating material 50 may be segmented insulating paper or an integral insulating paper with a through hole 54, it is easy to have gaps that cause excessive oil to enter the motor rotor. Therefore, the stator slot 23 of the stator core segment can be set as a closed slot 25, especially the stator slot 23 of the stator core punching sheet adjacent to the oil guide 30. Both sides of the oil guide 30 are stator cores 20, and the stator slot 23 of the stator core segment on at least one side can be set as a closed slot 25, which can also prevent excessive oil from entering the motor rotor.

[0112] In this embodiment, in order to better allow the cooling oil to enter the oil guide channel in the stator slot 23 from the oil guide cavity 31, after passing through the stator slots 23 of the stator core segments on both sides of the oil guide member 30, it is sprayed to the ends of the winding along the axial direction toward the two ends of the stator core 20, and the stator slots 23 of the first stator core segment 21 can be made into closed slots 25, or as Figure 5As shown, the stator slots 23 of the second stator core segment 22 are made into closed slots 25, and the stator slots 23 of the first stator core segment 21 and the stator slots 23 of the second stator core segment 22 may both be made into closed slots 25. Preferably, the stator slots 23 of a certain number of stator core punching sheets adjacent to the oil guide member 30 on the first stator core segment 21 and the second stator core segment 22 are made into closed slots 25. Since the stator core 20 is generally made of laminated silicon steel sheets, in actual applications, there may be one or more stacks of closed slots 25 on the first stator core segment 21 and / or the second stator core segment 22.

[0113] In an optional implementation manner of this embodiment, the stator winding 40 may be wound with copper wire, specifically, with a special-shaped copper wire having one or more side edges of the cross section with notches along the length direction.

[0114] Correspondingly, the aforementioned conductor 43 is a portion of copper wire located inside the stator slot 23 on the stator winding 40 . A notch is provided on the conductor 43 along the length direction based on one or more sides of the cross section, and an oil channel 44 is formed between the notch and the insulating material 50 .

[0115] like Figure 2 The stator winding 40 shown in the figure can be made of copper wire wound and welded, and wound around the stator slot 23. Optionally, the copper wire can be an enameled copper wire. Figure 8 and Fig. 9 As shown, the copper wire in this embodiment adopts a special-shaped copper wire, the cross section of the special-shaped copper wire is rectangular as a whole, and a notch is opened along the length direction on one side. Then the copper wire in the stator slot 23, that is, the conductor 43, also adopts a special-shaped copper wire, that is, the conductor 43 is also provided with a notch along the length direction based on one side of the cross section, and the notch can form an oil channel 44 with the insulating material 50 sleeved on the inner wall of the stator slot 23. Optionally, notches can also be set on multiple sides of the rectangle on the special-shaped copper wire, and multiple oil channels 44 are correspondingly formed between the notch and the insulating material 50. It can be understood that these oil channels 44 are located in the oil guide channel and are connected to the oil guide channel. When the cooling oil enters the oil guide channel from the oil guide cavity 31, it specifically enters the oil channel 44, fully fits with the conductor, that is, the copper wire, and takes away the heat of the copper wire, so as to better cool the stator winding 40.

[0116] Furthermore, the stator winding 40 is wound into a multi-layer coil in the stator slot 23 through the conductor 43. The multi-layer coil is stacked along the radial direction of the stator core 20 toward the center of the circle, and the gaps of two adjacent layers of coils are arranged opposite to each other.

[0117] like Figure 8As shown, the stator winding 40 is wound into 6 layers of coils in the stator slots 23 by the conductor 43. In practical applications, it can also be 4 layers, 8 layers, etc., which are not limited here. The 6 layers of coils are stacked along the radial direction of the stator core 20 toward the center of the circle, and the gap positions of the adjacent two layers of coils are opposite to ensure the stability of the stator winding 40.

[0118] In this embodiment, the insulating material 50 is sleeved inside the stator slot 23, inserted into the stator slot 23, and located between the inner wall of the stator slot 23 and the multi-layer coil. Fig.10 As shown, the insulating material 50 is sleeved inside the stator slot 23 and located between the inner wall of the stator slot 23 and the stator winding 40 , thereby insulating and separating the six layers of coils from the stator core 20 .

[0119] Optionally, the insulating material 50 may be a single-piece insulating material, or may be two-piece segmented insulating material including a first insulating material 51 and a second insulating material 52. When segmented insulating material is used, the first insulating material 51 and the second insulating material 52 may be inserted into the stator slot 23 of the first stator core segment 21 and the stator slot 23 of the second stator core segment 22, respectively, and the first insulating material 51 and the second insulating material 52 are not in axial contact, at which point the winding in the oil guide cavity 31 is not in contact with the stator core 20, and may be directly immersed in the cooling oil in the oil guide cavity 31.

[0120] Furthermore, the insulating material 50 may be an integrated insulating paper 53 , and a through hole 54 is provided on the insulating paper 53 at a position corresponding to the oil guide member 30 , and the through hole 54 is used to allow the cooling oil in the oil guide cavity 31 to enter the oil guide channel and the oil channel 44 .

[0121] like Figure 4 As shown, a through hole 54 is opened in the middle of the insulating paper 53, so that the support connected to the sealing ring 35 on the plastic structure 34 of the oil guide member 30 can pass through. At the same time, the cooling oil in the oil guide cavity 31 can also enter the oil channel 44 formed by the gap of the conductor 43 inside the insulating paper 53 and the inner wall of the insulating paper 53 or the gap between the conductor 43 and the insulating paper 53 through the through hole 54.

[0122] Optionally, the motor in which the motor oil cooling structure is located may also include:

[0123] The three-phase copper bar 60 is connected to the first winding end 41 of the motor oil cooling structure.

[0124] In this embodiment, the cooling oil can flow into the oil guide cavity 31 in the middle of the stator core 20 through the oil inlet 11 at the top of the casing 10, first soak the winding in the cooling oil guide cavity 31, and then pass through the oil channel 44 composed of the oil guide part 30, the insulating paper 53 and the conductor 43 to directly cool the winding in the stator slot 23, and then enter the two end windings of the stator winding 40, and be sprayed out from both ends of the stator core 20, spray cooling the first winding end 41 and the second winding end 42, and finally flow out from the first oil outlet 12 and the second oil outlet 13 at the bottom of the casing 10 respectively, completing the oil cooling of the motor.

[0125] The motor oil cooling structure of this embodiment has no oil groove structure on the stator yoke and no oil injection ring structure on the end, which saves space and is conducive to miniaturization of the motor; the stator winding is cooled by the oil guide part in the middle of the stator core and the stator winding is wound with special-shaped copper wire. The oil guide cavity in the middle of the stator core and the oil guide channel between the conductor and the insulating material in the stator slot and the oil channel are combined to guide the cooling oil from the middle of the stator core into the stator slot and the end of the winding, so as to achieve direct cooling of the copper wire in the stator slot and the end of the stator winding, and have a good cooling effect.

[0126] Embodiment 3

[0127] Reference Figure 1 , this embodiment proposes a motor, such as Figure 1 As shown, the motor may include:

[0128] The housing 10 and the motor oil cooling structure of the first or second embodiment disposed in the housing 10 .

[0129] Optionally, the motor may further include:

[0130] The three-phase copper bar 60 may be connected to the first winding end 41 of the motor oil cooling structure.

[0131] Among them, the specific structure of the motor oil cooling structure can refer to the above embodiments. Since this embodiment adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0132] It should be noted that the serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above embodiments are only optional embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the concept of the present application, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A motor oil cooling structure, characterized in that: include: A stator core, the stator core comprising at least two stator core segments, the inner peripheries of the stator core segments being provided with stator slots extending in the axial direction at intervals; a stator winding, the stator winding being wound around the stator slots and comprising a conductor located inside the stator slots; Insulating material, the insulating material is sleeved inside the stator slot and located between the inner wall of the stator slot and the conductor, and an oil guide channel is formed between the insulating material and the conductor along the axial direction; An oil guide member is axially sandwiched between two adjacent stator core segments. An oil guide structure is provided on the oil guide member. The oil guide structure forms an oil guide cavity between two adjacent stator core segments. The oil guide cavity is connected to the oil guide channel.

2. The motor oil cooling structure according to claim 1, characterized in that: The inner ring of the oil guide member is a closed structure, and the closed structure is sealed and connected to two adjacent stator core segments respectively.

3. The motor oil cooling structure according to claim 2, characterized in that: The oil guide member is a split structure, comprising an outer frame and an inner ring, the oil guide cavity is formed in the inner ring, and the oil guide channel is provided between the outer frame and the inner ring.

4. The motor oil cooling structure according to claim 3, characterized in that: The inner ring is a plastic structure.

5. The motor oil cooling structure according to claim 4, characterized in that: The plastic structure comprises a sealing ring and a supporting portion arranged outside the sealing ring, and a plurality of pillars are arranged on the supporting portion at intervals along a circumferential direction.

6. The motor oil cooling structure according to claim 5, characterized in that: The support column coincides with a projection of a stator tooth of the stator core segment along the axial direction.

7. The motor oil cooling structure according to claim 6, characterized in that: The distance between any two adjacent pillars is the width of one or more stator slots.

8. The motor oil cooling structure according to claim 3, characterized in that: The connection method between the outer frame and the inner ring includes any one of welding, clamping or injection molding.

9. The motor oil cooling structure according to claim 3, characterized in that: A first positioning mark is arranged on the outer frame, and a second positioning mark corresponding to the first positioning mark is arranged on the stator core segment.

10. The motor oil cooling structure according to claim 1, characterized in that: The outer diameter of the oil guide member is the same as the outer diameter of the stator core segment, and an oil channel is provided on the surface of the oil guide member.

11. The motor oil cooling structure according to claim 10, characterized in that: Oil passages are provided on the surfaces of the oil guide member and the stator core segment, and the oil passages of the oil guide member and the stator core segment are located on the same straight line.

12. The motor oil cooling structure according to claim 1, characterized in that: The oil guide member is provided with an oil through hole, and the oil through hole is communicated with the oil guide cavity.

13. The motor oil cooling structure according to claim 1, characterized in that: The stator slots of the stator core segment adjacent to the oil guide member are closed slots; or, The stator slots of one stator core segment on one side of the oil guide member are open slots, and the stator slots of another stator core segment on the other side of the oil guide member are closed slots.

14. The motor oil cooling structure according to claim 1, characterized in that: The stator winding is wound with copper wire, and a notch is provided on the conductor along the length direction based on one or more sides of the cross section, and an oil channel is formed between the notch and the insulating material.

15. The motor oil cooling structure according to claim 14, characterized in that: The insulating material is made of integrated insulating paper, and a through hole is provided on the insulating paper at a position corresponding to the oil guide member, and the through hole is used to allow the cooling oil of the oil guide cavity to enter the oil guide channel and the oil liquid channel.

16. A motor, characterized in that: The invention comprises the motor oil cooling structure as claimed in any one of claims 1 to 15.

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