CN115603484A

CN115603484A - Axial magnetic field motor and stator cooling structure

Info

Publication number: CN115603484A
Application number: CN202211299359.4A
Authority: CN
Inventors: 徐典友; 汤磊; 张广权; 陈进华
Original assignee: Shanghai Panhu Power Technology Co ltd
Current assignee: Shanghai Panhu Power Technology Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-01-13

Abstract

The invention provides an axial magnetic field motor and a stator cooling structure, wherein the stator cooling structure comprises an iron core outer ring oil gap positioned on the radial outer side of an inner ring oil way, and a plurality of inter-winding inward oil ways are communicated between the iron core outer ring oil gap and the inner ring oil way; the oil outlet of the spray ring is positioned on the radial outer side of the oil way of the inner ring, a plurality of outward oil ways among windings are communicated between the oil outlet of the spray ring and the oil way of the inner ring, and the oil outlet of the spray ring and the oil clearance of the outer ring of the iron core are arranged at intervals along the circumferential direction; the oil spraying channel of the spraying ring is positioned at the radial outer side of the oil gap of the outer ring of the iron core, the oil spraying channel of the spraying ring is communicated with the oil gap of the outer ring of the iron core through a plurality of spraying holes, and the oil spraying channel of the spraying ring and the oil outlet of the spraying ring are arranged at intervals along the circumferential direction; the shell inlet is communicated with the oil spraying oil path of the spraying ring, and the shell outlet is communicated with the oil outlet of the spraying ring, so that the trend of the cooling medium can cover all the iron core windings, the periphery of each iron core winding can be completely surrounded, the space is reasonably utilized, and the cooling capacity is effectively improved.

Description

Axial magnetic field motor and stator cooling structure

Technical Field

The invention relates to the field of axial magnetic field motors, in particular to an axial magnetic field motor and a stator cooling structure.

Background

The axial magnetic field motor is also called a disc motor, has the advantages of small volume, high torque density, high power density, high efficiency and the like, and is widely applied to the fields of electric automobiles, general industries and the like. The motor includes a housing, a stator, and a rotor, the stator and the rotor being disposed inside the housing. The motor will generate various losses during the operation process, and further the motor will generate heat. In order to improve the working efficiency of the motor, a cooling structure needs to be designed for the motor. At present, a channel is arranged on a bottom plate of a shell, and a cooling medium is introduced to exchange heat for a heating element, so that the cooling effect is realized.

The main heating element of the motor is an iron core winding of the stator, and in the mode that the channel is arranged on the bottom plate, the cooling medium is not in direct contact with the iron core winding, so that the heat exchange effect is poor. And the channel is arranged in the bottom plate, so that the processing difficulty is high, and even the supporting capability and strength of the bottom plate are influenced. Although the prior art has the stator cavity that encloses cooling medium direct introduction casing to with the iron core winding contact heat transfer of installing in the stator cavity, a plurality of iron core windings have been arranged along circumference in the stator cavity, and cooling medium is mobile in the stator cavity, and cooling medium can hardly avoid not having with all iron core winding contact heat transfer and directly discharging, and how to guarantee that cooling medium's flow trend can cover all iron core windings is the problem that needs to solve urgently.

Disclosure of Invention

In order to solve the problems, the invention provides an axial magnetic field motor and stator cooling structure, which reasonably utilizes space, enables the trend of a cooling medium to cover all iron core windings so as to ensure cooling capacity, and simultaneously utilizes an insulating spray ring and a shell to be matched to form a spray ring oil injection circuit so as to avoid the defect that the support capacity and strength of the shell are reduced because the spray ring oil injection circuit is arranged in the shell.

In accordance with one object of the present invention, there is provided a stator cooling structure comprising:

the device comprises a shell inlet, a spraying ring oil injection oil path, an iron core outer ring oil gap, an inter-winding inward oil path, an inner ring oil path, an inter-winding outward oil path, a spraying ring oil outlet and a shell outlet;

the iron core outer ring oil gap is positioned on the radial outer side of the inner ring oil way, and a plurality of inter-winding inward oil ways are communicated between the iron core outer ring oil gap and the inner ring oil way;

the oil outlet of the spraying ring is positioned on the radial outer side of the inner ring oil way, a plurality of inter-winding outward oil ways are communicated between the oil outlet of the spraying ring and the inner ring oil way, and oil gaps between the oil outlet of the spraying ring and the outer ring of the iron core are arranged at intervals along the circumferential direction;

the oil spraying channel of the spraying ring is positioned at the radial outer side of the oil clearance of the outer ring of the iron core, the oil spraying channel of the spraying ring is communicated with the oil clearance of the outer ring of the iron core through a plurality of spray holes, and the oil spraying channel of the spraying ring and the oil outlet of the spraying ring are arranged at intervals along the circumferential direction;

the shell inlet is communicated with the oil injection oil way of the spray ring, and the shell outlet is communicated with the oil outlet of the spray ring.

As a preferred embodiment, the method further comprises the following steps:

a housing including radially inner and outer shrouds, said housing inlet and said housing outlet opening onto said outer shroud;

the spraying ring is connected to the inner side of the peripheral plate so as to form a spraying ring oil spraying oil path between the spraying ring and the peripheral plate, the spraying holes and the spraying ring oil outlet are formed in the spraying ring, and the spraying ring oil outlet is opposite to the shell outlet;

the iron core windings are arranged at intervals along the circumferential direction and are positioned between the inner enclosing plate and the spraying ring, an inner ring oil way is formed between the iron core windings and the inner enclosing plate, an iron core outer ring oil gap is formed between the spraying ring and the iron core windings opposite to the spraying ring, an inter-winding inward oil way is formed between two iron core windings opposite to and adjacent to the spraying ring, and an inter-winding outward oil way is formed between two iron core windings opposite to and adjacent to the oil outlet of the spraying ring.

As a preferred embodiment, the oil outlet of the oil spray ring and the oil spray passage of the oil spray ring are blocked by a blocking member, the blocking member abuts between the iron core winding and the peripheral plate, wherein one blocking member is blocked between the housing inlet and the housing outlet.

In a preferred embodiment, the oil spray passage of the spray ring comprises at least one cooling groove, and the side of the spray ring connected with the peripheral plate is recessed to form the cooling groove, and/or the side of the peripheral plate connected with the spray ring is recessed to form the cooling groove.

In a preferred embodiment, the peripheral plate and the spray ring are respectively provided with a cooling groove, the peripheral plate and the cooling grooves on the spray ring are oppositely and communicatively arranged, and the spray holes are located at the bottom of the cooling grooves of the spray ring.

In a preferred embodiment, a plurality of the injection holes are arranged at intervals along the circumferential direction of the injection ring, and each injection hole is arranged linearly along the axial direction.

In a preferred embodiment, the nozzle hole faces the center of the core winding.

As a preferred embodiment, the housing further includes two bottom plates, the peripheral plate and the spray ring are connected between the two bottom plates, and both axial ends of the core winding are connected to the two bottom plates, respectively.

As a preferred embodiment, the iron core winding includes an iron core and a coil, a plurality of positioning grooves are formed in the bottom plate, the positioning grooves on the two bottom plates correspond to one another, the iron core is inserted into the positioning grooves corresponding to the two bottom plates, and the coil around the iron core is abutted between the two bottom plates.

According to another object of the present invention, there is also provided an axial-field motor including the stator cooling structure of the above embodiment, and further including two rotors held in air-gaps on both axial sides of the stator cooling structure.

Compared with the prior art, the technical scheme has the following advantages:

cooling medium is introduced into the oil injection oil path of the spray ring from the shell inlet, and then is uniformly sprayed into an oil gap of an outer ring of the iron core through spray holes which are circumferentially arranged at intervals, and then flows into the oil path of the inner ring through an inward oil path between the windings, and the cooling oil in the oil path 1106 of the inner ring flows to the oil outlet of the spray ring through an outward oil path between the windings until the cooling oil is discharged from the shell outlet, wherein the inward oil path between two adjacent windings and the outward oil path between two adjacent windings are used for accommodating the iron core windings, so that the trend of the cooling medium can cover all the iron core windings, and the periphery of each iron core winding can be completely surrounded, the space is reasonably utilized, the cooling capacity is effectively improved, and the reliability of the stator is further ensured.

The spraying ring is matched with the shell to form the spraying ring oil injection oil path for introducing cooling media, and the cooling media are sprayed to the iron core winding in the stator cavity through the spraying holes in the spraying ring to achieve the cooling effect. Compared with the mode of processing the interior of the shell in the prior art, the spray ring can be processed only, the processing difficulty is effectively reduced, and the structural strength and the supporting capacity of the shell are guaranteed.

The invention is further explained by the following combined with the drawings and the embodiments.

Drawings

Fig. 1 is a sectional view of a stator cooling structure according to the present invention;

FIG. 2 is a schematic structural view of a stator cooling structure according to the present invention;

FIG. 3 is a schematic structural view of a spray ring in the stator cooling structure according to the present invention;

fig. 4 is a schematic structural diagram of an outer shroud plate in the stator cooling structure according to the present invention.

In the figure: 100 stator cooling structure, 1001 spray ring oil injection way, 1001a cooling groove, 1002 stator cavity, 110 shell, 111 enclosing plate, 111a peripheral plate, 111b inner enclosing plate, 111b1 shunting table, 112 bottom plate, 112a positioning groove, 1101 shell inlet, 1102 shell outlet, 1104 iron core outer ring oil gap, 1105 winding inward oil way, 1106 inner ring oil way, 1107 winding outward oil way, 120 spray ring, 121 spray hole, 122 spray ring oil outlet, 123 baffle, 130 iron core winding, 131 iron core, 132 coil and 1300 stator groove.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

First embodiment

As shown in fig. 1, the stator cooling structure 100 includes:

a shell inlet 1101, a ring-spraying oil path 1001, an iron core outer ring oil gap 1104, an inter-winding inward oil path 1105, an inner ring oil path 1106, an inter-winding outward oil path 1107, a ring-spraying oil outlet 122 and a shell outlet 1102;

the core outer ring oil gap 1104 is located on the radial outer side of the inner ring oil path 1106, and a plurality of inter-winding inward oil paths 1105 are communicated between the core outer ring oil gap 1104 and the inner ring oil path 1106;

the oil outlet 122 of the oil jet ring is located at the radial outer side of the inner ring oil path 1106, a plurality of winding outward oil paths 1107 are communicated between the oil outlet 122 of the oil jet ring and the inner ring oil path 1106, and the oil outlet 122 of the oil jet ring and the oil gap 1104 of the outer ring of the iron core are arranged at intervals along the circumferential direction;

the oil spraying ring oil spraying path 1001 is located on the radial outer side of the oil clearance 1104 on the outer ring of the iron core, the oil spraying ring oil spraying path 1001 is communicated with the oil clearance 1104 on the outer ring of the iron core through a plurality of spraying holes 121, and the oil spraying ring oil spraying path 1001 and the oil spraying ring oil outlet 122 are arranged at intervals along the circumferential direction;

the shell inlet 1101 is communicated with the spray ring oil spray oil path 1101, and the shell outlet 1102 is communicated with the spray ring oil outlet 122.

Cooling medium (including cooling oil) is introduced into the ring-spraying oil circuit 1001 from the shell inlet 1101, then is uniformly sprayed into the core outer ring oil gap 1104 through the spray holes 121 which are circumferentially arranged at intervals, then passes through the inter-winding inward oil passages 1105 and flows into the inner ring oil passage 1106, and the cooling oil in the inner ring oil passage 1106 flows to the ring-spraying oil outlet 122 through the inter-winding outward oil passages 1107 until is discharged from the shell outlet 1102, wherein the adjacent two inter-winding inward oil passages 1105 and the adjacent two inter-winding outward oil passages 1107 are used for accommodating the core windings 130, so that the cooling medium can cover all the core windings in the direction and can completely surround the periphery of each core winding 130, the space is reasonably utilized, the cooling capacity is effectively improved, and the reliability of the stator is further ensured.

Referring to fig. 1, a plurality of inter-winding inward oil passages 1105 and a plurality of inter-winding outward oil passages 1107 are circumferentially spaced, where the number of inter-winding inward oil passages 1105 is significantly greater than the number of inter-winding outward oil passages 1107, where the inter-winding inward oil passages 1105 are in relative communication with the core outer ring oil gap 1104, and the inter-winding outward oil passages 1107 are in relative communication with the ring injection oil outlet 122, that is, the ring injection oil passage 1001 is in communication with the inter-winding inward oil passages 1105 through the core outer ring oil gap 1104, and the inter-winding outward oil passages 1107 are in communication with the housing outlet 1102 through the ring injection oil outlet 122.

With reference to fig. 1, the plurality of nozzle holes 121 are circumferentially and intermittently communicated between the nozzle ring oil injection oil path 1001 and the core outer ring oil clearance 1104, so that the cooling medium can be uniformly injected into the core outer ring oil clearance 1104, and all the core windings 130 can be soaked by the cooling medium, thereby improving the cooling capacity.

As shown in fig. 1 and 2, the stator cooling structure 100 further includes:

a housing 110, said housing 110 comprising a shroud 111, said shroud 111 being divided into radially aligned inner and

outer shrouds

111b and 111a, said housing inlet 1101 and said housing outlet 1102 opening onto said outer shroud 111 a;

a spray ring 120, said spray ring 120 being connected to the inside of said peripheral plate 111a to form a spray ring oil spray oil path 1001 between said spray ring 120 and said peripheral plate 111a, said spray holes 121 and said spray ring oil outlet 122 being opened on said spray ring 120, said spray ring oil outlet 122 being opposite to said housing outlet 1102;

the iron core windings 130 are circumferentially arranged at intervals and located between the inner surrounding plate 111b and the spray ring 120, an inner ring oil path 1106 is formed between the iron core windings 130 and the inner surrounding plate 111b, an iron core outer ring oil gap 1104 is formed between the spray ring 120 and the iron core windings 130 opposite to the spray ring 120, an inter-winding inward oil path 1105 is formed between two iron core windings 130 opposite to and adjacent to the spray ring 120, and an inter-winding outward oil path 1107 is formed between two iron core windings 130 opposite to and adjacent to the spray ring oil outlet 122.

The spray ring 120 and the outer surrounding plate 111a can be spliced to form a spray ring oil spray path 1001, the spray ring 120 and the outer surrounding plate 111a can be bonded and fixed through glue, a stator cavity 1002 is formed between the spray ring 120 and the inner surrounding plate 111b, and the inter-winding inward oil path 1105, the inter-winding outward oil path 1107, the iron core outer ring oil gap 1104, the inter-winding inward oil path 1105, the inner ring oil path 1106 and the inter-winding outward oil path 1107 are all located in the stator cavity 1002.

The spray ring 120 and the housing 110 cooperate to form the spray ring oil spray oil path 1001 for introducing a cooling medium (including cooling oil, etc.), and the cooling medium is sprayed to the core winding 130 in the stator cavity 1002 through the spray holes 121 of the spray ring 120, so as to achieve a cooling effect. Compared with the mode of processing the inside of the shell in the prior art, the method can only process the spray ring 120, effectively reduces the processing difficulty, and simultaneously ensures the structural strength and the supporting capacity of the shell 110.

In addition, a gap is required to be maintained between the conventional core winding 130 and the surrounding plate 111 to ensure insulation therebetween and avoid short circuit and the like. At this time, the spraying ring 120 may be made of an insulating material, for example, a plastic spraying ring, and by abutting the spraying ring 120 between the core winding 130 and the surrounding plate 111, the spraying ring oil spraying passage 1001 may be formed between the spraying ring 120 and the surrounding plate 111, insulation between the core winding 130 and the surrounding plate 111 may be ensured, and a distance between the core winding 130 and the surrounding plate 111 may be shortened, so as to reduce an overall radial dimension and ensure adaptability of an installation environment.

As shown in fig. 1, the core windings 130 include a core 131 and a coil 132, the coil 132 is sleeved on the periphery of the core 131, the coil 132 may be a copper coil, and the coil 132 is adapted to the shape of the core 131, wherein the core 131 is trapezoidal, the trapezoidal upper bottom of the core 131 is disposed inward, the trapezoidal lower bottom of the core 131 is disposed outward, and a stator slot 1300 is formed between two adjacent core windings 130, and is used for the cooling medium to pass through. When the coil 132 is tightly wound around the outer circumference of the core 131, the cooling medium may pass between the coils 132 of the two core windings 130, i.e., the inter-winding inward oil path 1105 or the inter-winding outward oil path 1107. Of course, there may be a gap between the coil 132 and the core 131, that is, the cooling medium may pass through between the coil 132 and the core 131 to simultaneously contact the coil 132 and the core 131, so as to further enhance the cooling effect.

As shown in fig. 2, the housing 110 includes two bottom plates 112, and the enclosure 111 is connected between the two bottom plates 112 and can be fixed by bolts, which can be disposed on the enclosure 111 located at the radially inner side and the radially outer side to ensure the connection is stable. One of the bottom plates 112 may be connected with the surrounding plate 111 by injection molding, and the other bottom plate 112 may be detachably connected with the surrounding plate 111 to implement the arrangement of the iron core winding 130 and the spray ring 120, which may increase the sealing performance, and of course, a sealing ring may be further added between the bottom plate 112 and the surrounding plate 111 to improve the sealing performance.

The bottom plate 112 is provided with a plurality of positioning slots 112a, the positioning slots 112a of the two bottom plates 112 are in one-to-one correspondence, the iron core 131 is inserted into the positioning slots 112a of the two bottom plates 112, and the coil 132 sleeved on the periphery of the iron core 131 abuts between the two bottom plates 112.

Wherein the positioning groove 112a is matched with the iron core 131 in shape and is trapezoidal, and the iron core 131 can be reinforced and fixed in the positioning groove 112a through glue, so that the bonding strength is ensured, and the stability of the lifting structure is improved. And the positioning groove 112a enables the core winding 130 to be positioned and mounted on the base plate 112, so as to improve the mounting efficiency and ensure the mounting position.

Similarly, the spray ring 120 is fixed between the two bottom plates 112, and the spray ring 120 and the bottom plates 112 may be fixed by gluing to separate the stator cavity 1002 from the spray ring oil spray path 1001.

The coaming 111 can be made of high-strength metal or high-strength non-metal materials, wherein the high-strength metal materials comprise alloy steel, aluminum alloy and the like, the high-strength non-metal materials comprise glass fiber composite materials, carbon fiber composite materials or plastics, and the plastics comprise PPS, PPA, PA, PEEk and the like, so that the manufacturing strength of the coaming 111 is ensured. The base plate 112 is made of a non-metal material, such as a glass fiber composite material, a carbon fiber composite material or plastic, and the thickness of the base plate 112 is relatively thin, so that it is ensured that two axial ends of the iron core winding 130 can be respectively matched with air gaps of two rotors, and then the axial magnetic field motor with a single stator and two rotors is obtained through assembly.

As shown in fig. 2, the casing 110 is generally in a disk shape, that is, the shroud 111 is in a ring shape, and the spray ring 120 is also in a ring shape, but the shape of the spray ring 120 may be adjusted according to the shape of the casing 110.

As shown in fig. 1 to 3, a housing inlet 1101 and a housing outlet 1102 are provided on the peripheral plate 111a, the housing inlet 1101 is communicated with the annular nozzle oil path 1001, and the housing outlet 1102 is communicated with the stator cavity 1002, so that the cooling medium is firstly introduced into the annular nozzle oil path 1001 through the housing inlet 1101, and then is injected into the stator cavity 1002 through the nozzle holes 121 on the nozzle ring 120 to cool the core winding 130 in the stator cavity 1002, and then the cooling medium after heat exchange in the stator cavity 1002 is discharged from the housing outlet 1102.

As shown in fig. 1 and fig. 3, a spray ring oil outlet 122 is formed in the spray ring 120, the spray ring oil outlet 122 and the spray ring oil spray oil path 1001 are arranged at intervals along the circumferential direction of the spray ring 120, and the spray ring oil outlet 122 is opposite to the housing outlet 1102. The housing outlet 1102 is communicated with the stator cavity 1002 through the jet ring oil outlet 122, that is, the cooling medium after heat exchange in the stator cavity 1002 flows from the jet ring oil outlet 122 to the housing outlet 1102, and is discharged from the housing outlet 1102, referring to fig. 1.

Further, two blocking members 123 are disposed on the spray ring 120, a blocking member 123 is disposed at a position between two circumferential sides of the access hole 122 and the spray ring oil spray oil circuit 1001, that is, the spray ring oil outlet 122 and the spray ring oil spray oil circuit 1001 are blocked by the blocking member 123, the blocking member 123 abuts between the iron core winding 130 and the peripheral plate 111a, and one of the blocking members 123 is blocked between the housing inlet 1101 and the housing outlet 1102. This avoids that the cooling medium introduced by the housing inlet 1101 is discharged directly clockwise from the housing outlet 1102 and that the cooling mechanism after heat exchange is discharged from the housing inlet 1101.

As shown in fig. 1, the cooling medium introduced from the housing inlet 1101 flows in the ring-spraying oil path 1001 in the counterclockwise direction under the blocking of the blocking member 123, the cooling medium in the ring-spraying oil path 1001 is sprayed into the stator cavity 1002 through the plurality of spraying holes 121, and the cooling medium passes through between two adjacent core windings 130, flows from the radial outer side to the radial inner side of the core windings 130, merges, and finally passes through the gap between the cores 131 opposite to the ring-spraying oil outlet 122 until being discharged from the housing outlet 1102.

As shown in fig. 1 and 2, the housing 110 further includes an inner surrounding plate 111b, the inner surrounding plate 111b is connected between the two bottom plates 112, and a center of the inner surrounding plate 111b is connected to the rotating shaft. When the cooling medium flows to the radially inner side of the core winding 130, the cooling medium flows along the outer periphery of the inner peripheral plate 111b until passing through the gap between the cores 131 opposite to the oil jet outlet 122.

With continued reference to fig. 1, the circumferential dimension of the oil outlet 122 is substantially equal to the distance between two of the barriers 123, each of the barriers 123 now abuts one of the core windings 130, and one of the core windings 130 is disposed between two adjacent barriers 123. While the circumferential dimension of said ring outlet 122 and the distance between two of said barriers 123 may define the size of the cooling medium discharge passage, the circumferential dimension of the ring outlet 122 and the distance between two of said barriers 123 may be adjusted to adjust the size of the cooling medium discharge passage to adjust the flow resistance.

As shown in fig. 1 and 3, the plurality of nozzle holes 121 are arranged at intervals along the circumference of the nozzle ring 120, so that the cooling medium is uniformly sprayed into the stator cavity 1002 from each circumferential angle, and each core winding 130 can contact the cooling medium, thereby ensuring the cooling effect.

Referring to fig. 1, the nozzle holes 121 are aligned with the centers of the core windings 130, so that the cooling medium sprayed from the nozzle holes 121 is directly sprayed to the radial outer sides of the core windings 130, then passes through between two adjacent core windings 130, and flows to the radial inner sides of the core windings 130, so that the radial outer sides of the core windings 130 can also contact the cooling medium, the outer peripheries of the core windings 130 can contact the cooling medium, and the cooling effect is further improved. When the spray ring 120 abuts against the core windings 130, the spray holes 121 may correspond to a gap between the two core windings 130.

The core winding 130 is spaced between two adjacent nozzle holes 121, and the nozzle holes 121 are linear, but not limited thereto, the coil 132 of the core winding 130 can be uniformly cooled by adjusting the size, shape and number of the nozzle holes 121 to adjust the oil outlet amount.

As shown in fig. 3 and 4, the nozzle ring oil spray path 1001 includes at least one cooling groove 1001a, and the cooling groove 1001a is formed by recessing the side of the nozzle ring 120 connected to the peripheral plate 111a, and/or the cooling groove 1001a is formed by recessing the side of the peripheral plate 111a connected to the nozzle ring 120.

The cooling groove 1001a may be formed only on the spray ring 120, so that only the cooling groove 1001a needs to be processed, the processing difficulty is reduced, and the strength and the supporting capability of the housing 110 are ensured, at this time, the spray hole 121 is located at the bottom of the cooling groove 1001a of the spray ring 120.

Of course, the cooling groove 1001a may be formed on the outer peripheral plate 111a of the housing 110, and since only the inner sidewall of the outer peripheral plate 111a is processed, the processing difficulty is reduced for the processing inside the housing.

When the peripheral plate 111a and the spray ring 120 are respectively provided with the cooling grooves 1001a, the volume of the cooling grooves 1001a can be increased, and at this time, the peripheral plate 111a and the cooling grooves 1001a on the spray ring 120 are oppositely and communicatively arranged, and the spray holes 121 are located at the bottom of the cooling grooves 1001a of the spray ring 120.

As shown in fig. 1 and 3, a circumferential dimension of cooling groove 1001a is much larger than a circumferential dimension of spray ring oil outlet 122.

Because the cooling medium in the oil spraying path 1001 needs to be sprayed into the stator cavity 1002 through the spraying holes 121 of the spraying ring 120, when the spraying ring 120 abuts against the peripheral plate 111a, the requirement on the sealing performance between the spraying ring 120 and the peripheral plate is not high, that is, the two axial ends of the spraying ring 120 are directly fixed to the two base plates 112. In order to ensure the strength of the spray ring 120, a plurality of reinforcing ribs may be disposed on a side of the spray ring 120 facing the core winding 130 to prevent the spray ring 120 from deforming. The reinforcing ribs are arranged in a staggered manner with respect to the nozzle holes 121, and abut against the core winding 130.

In summary, the cooling medium is introduced into the ring-spraying oil path 1001 through the housing inlet 1101, then is uniformly sprayed into the core outer-ring oil gap 1104 through the circumferentially spaced spray holes 121, and then passes through the inter-winding inward oil paths 1105 and flows into the inner-ring oil path 1106, while the cooling oil in the inner-ring oil path 1106 flows to the ring-spraying oil outlet 122 through the inter-winding outward oil paths 1107 until being discharged from the housing outlet 1102, wherein the adjacent two inter-winding inward oil paths 1105 and the adjacent two inter-winding outward oil paths 1107 are used for accommodating the core windings 130, so that the cooling medium can extend to cover all the core windings and can completely surround the outer periphery of each core winding 130, the space is reasonably utilized, the cooling capacity is effectively improved, and the reliability of the stator is further ensured. The spray ring 120 and the housing 110 are used for matching to form the spray ring oil spray oil path 1001 for introducing a cooling medium, and the cooling medium is sprayed to the core winding 130 in the stator cavity 1002 through the spray holes 121 on the spray ring 120, so as to achieve a cooling effect. Compared with the mode of processing the inside of the shell in the prior art, the method can process only the spray ring 120, effectively reduces the processing difficulty, and simultaneously ensures the structural strength and the supporting capacity of the shell 110. The nozzle ring 120 may abut against the outer peripheral plate 111a = of the housing 110, that is, the nozzle ring oil spray oil path 1001 may be formed on the radially outer side of the core winding 130. The spraying ring 120 can be made of an insulating material, and the spraying ring 120 is abutted between the iron core winding 130 and the enclosing plate 111, so that the spraying ring oil spraying oil circuit 1001 can be formed between the spraying ring 120 and the enclosing plate 111, the insulation between the iron core winding 130 and the enclosing plate 111 is ensured, the distance between the iron core winding 130 and the enclosing plate 111 can be shortened, the overall radial size is reduced, and the adaptability of the installation environment is ensured.

Second embodiment

The invention also provides an axial magnetic field motor, which comprises the stator cooling structure 100 of the embodiment, and the axial magnetic field motor further comprises two rotors, wherein the two rotors are respectively retained on two axial sides of the stator cooling structure 100 in an air gap manner, and the axial magnetic field motor is a single-stator double-rotor axial magnetic field motor.

Since the axial magnetic field motor employs the stator cooling structure 100 of the above-described embodiment, the stator cooling structure 100 can be referred to for the advantageous effects of the axial magnetic field motor.

The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the scope of the present invention is not limited by the embodiments, i.e. all equivalent changes or modifications made in the spirit of the present invention are still within the scope of the present invention.

Claims

1. A stator cooling structure (100), comprising: spray ring oil spray oil circuit

The oil-gas separation device comprises a shell inlet (1101), a spray ring oil injection oil path (1001), an iron core outer ring oil gap (1104), an inter-winding inward oil path (1105), an inner ring oil path (1106), an inter-winding outward oil path (1107), a spray ring oil outlet (122) and a shell outlet (1102);

the iron core outer ring oil gap (1104) is positioned on the radial outer side of the inner ring oil way (1106), and a plurality of inter-winding inward oil ways (1105) are communicated between the iron core outer ring oil gap (1104) and the inner ring oil way (1106);

the oil spraying ring outlet (122) is located on the radial outer side of the inner ring oil way (1106), a plurality of winding outward oil ways (1107) are communicated between the oil spraying ring outlet (122) and the inner ring oil way (1106), and the oil spraying ring outlet (122) and the oil clearance (1104) of the outer ring of the iron core are arranged at intervals along the circumferential direction;

the oil spraying ring oil spraying path (1001) is located on the radial outer side of the oil clearance (1104) of the outer ring of the iron core, the oil spraying ring oil spraying path (1001) is communicated with the oil clearance (1104) of the outer ring of the iron core through a plurality of spraying holes (121), and the oil spraying ring oil spraying path (1001) and the oil spraying ring oil outlet (122) are arranged at intervals along the circumferential direction;

the shell inlet (1101) is communicated with the spray ring oil injection oil way (1101), and the shell outlet (1102) is communicated with the spray ring oil outlet (122).

2. The stator cooling structure (100) according to claim 1, further comprising:

a housing (110), said housing (110) including radially aligned inner (111 b) and outer (111 a) peripheral plates, said housing inlet (1101) and said housing outlet (1102) opening onto said outer peripheral plate (111 a);

the spray ring (120) is connected to the inner side of the peripheral plate (111 a) to form a spray ring oil injection way (1001) between the spray ring (120) and the peripheral plate (111 a), the spray holes (121) and the spray ring oil outlet (122) are formed in the spray ring (120), and the spray ring oil outlet (122) is opposite to the shell outlet (1102);

the iron core winding structure comprises a plurality of iron core windings (130), wherein the iron core windings (130) are arranged at intervals along the circumferential direction and are located between the inner enclosing plate (111 b) and the spraying ring (120), an inner ring oil way (1106) is formed between the iron core windings (130) and the inner enclosing plate (111 b), an iron core outer ring oil gap (1104) is formed between the spraying ring (120) and the iron core windings (130) opposite to the spraying ring (120), an inter-winding inward oil way (1105) is formed between two iron core windings (130) opposite to and adjacent to the spraying ring (120), and an inter-winding outward oil way (1107) is formed between two iron core windings (130) opposite to and adjacent to the spraying ring oil outlet (122).

3. The stator cooling structure (100) according to claim 2, wherein the ring oil outlet (122) is blocked from the ring oil spray passage (1001) by a blocking member (123), the blocking member (123) abutting between the core winding (130) and the peripheral plate (111 a), wherein one of the blocking members (123) is blocked between the housing inlet (1101) and the housing outlet (1102).

4. The stator cooling structure (100) according to claim 2, wherein the spray ring oil spray oil path (1001) comprises at least one cooling groove (1001 a), the side of the spray ring (120) connected with the peripheral plate (111 a) is recessed to form the cooling groove (1001 a), and/or the side of the peripheral plate (111 a) connected with the spray ring (120) is recessed to form the cooling groove (1001 a).

5. The stator cooling structure (100) according to claim 4, wherein the peripheral plate (111 a) and the spray ring (120) are respectively provided with cooling grooves (1001 a), the peripheral plate (111 a) and the cooling grooves (1001 a) on the spray ring (120) are oppositely and communicatively provided, and the spray holes (121) are located at the bottom of the cooling grooves (1001 a) of the spray ring (120).

6. The stator cooling structure (100) according to claim 2, wherein a plurality of the nozzle holes (121) are arranged at intervals along a circumferential direction of the nozzle ring (120), and each nozzle hole (121) is arranged linearly along an axial direction.

7. The stator cooling structure (100) according to claim 2, wherein the nozzle hole (121) is directed toward a central position of the core winding (130).

8. The stator cooling structure (100) according to claim 2, wherein the housing (110) further comprises two bottom plates (112), the peripheral plate (111 a) and the spray ring (120) are connected between the two bottom plates (112), and both axial ends of the core winding (130) are connected to the two bottom plates (112), respectively.

9. The stator cooling structure (100) according to claim 8, wherein the core winding (130) comprises a core (131) and a coil (132), the bottom plate (112) is provided with a plurality of positioning slots (112 a), the positioning slots (112 a) of the two bottom plates (112) are in one-to-one correspondence, the core (131) is inserted into the positioning slots (112 a) of the two bottom plates (112), and the coil (132) sleeved on the periphery of the core (131) abuts against the two bottom plates (112).

10. An axial field electrical machine, comprising a stator cooling structure (100) according to any of claims 1 to 9, and further comprising two rotors held with air gaps on both axial sides of the stator cooling structure (100).