CN115296499A

CN115296499A - Cooling structure, manufacturing method thereof and axial magnetic field motor

Info

Publication number: CN115296499A
Application number: CN202210978402.3A
Authority: CN
Inventors: 崔豪杰; 陈翾; 于河波; 何俊明; 梁雨生; 王治会
Original assignee: Zhejiang PanGood Power Technology Co Ltd
Current assignee: Zhejiang PanGood Power Technology Co Ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-11-04
Also published as: WO2024036658A1

Abstract

The invention provides a cooling structure, a manufacturing method thereof and an axial magnetic field motor, wherein the cooling structure comprises a shell and a flow channel formed in the shell, the shell is formed by combining heat conduction materials and strength materials, and a heat exchange surface is formed on the outer surface of the shell where the heat conduction materials are located and used for contacting a piece to be cooled. The cooling structure can meet the requirements of strength and heat conductivity at the same time, so that the stability and reliability of the cooling structure are ensured, and a cooling medium is introduced into the flow channel in the shell to effectively cool a to-be-cooled part.

Description

Cooling structure, manufacturing method thereof and axial magnetic field motor

Technical Field

The invention relates to the field of cooling, in particular to a nonmetal cooling structure applicable to an axial magnetic field motor, a manufacturing method of the nonmetal cooling structure and the axial magnetic field motor.

Background

The motor is an electromagnetic device which realizes electric energy conversion or transmission according to the electromagnetic induction law, and the motor is mainly used for generating driving torque and serving as a power source of electric appliances or various machines. The motor can be classified into a radial magnetic field motor and an axial magnetic field motor, the axial magnetic field motor is also called a disk motor, and the axial magnetic field motor has the characteristics of small volume, light weight, short axial size, high power density and the like, can be used in most thin installation occasions, and is widely used.

The motor comprises a shell, a stator and a rotor, wherein the stator and the rotor are arranged in the shell, the stator is an electric stationary part and mainly comprises an iron core and a coil wound on the iron core, the coil is formed by winding an enameled wire, and the stator is used for generating a rotating magnetic field so that the rotor is cut by magnetic lines of force in the magnetic field to generate current. During operation of the motor, much heat is generated inside, and most of the heat is generated by the coil, which causes the temperature of the coil to rise. If the temperature of the coil is too high, an insulating layer on the surface of the coil can be damaged, short circuit occurs between enameled wires, and the serious result that the motor is burnt is caused; in addition, the permanent magnet on the rotor can generate part of heat, and the permanent magnet can be demagnetized when the temperature is too high, so that the performance of the motor is reduced, and therefore the motor needs to be provided with a cooling structure to cool a heating element of the motor.

Wherein the cooling structure is used for cooling medium to pass through to carry out the heat transfer to the heating element of motor. In order to improve the cooling capacity of the heating element, the existing cooling structure mostly adopts a metal material with better heat conductivity so as to achieve better cooling effect. However, in some special occasions, the cooling structure of the metal material is not suitable, for example, inside an electromagnetic device, when the metal material is placed in an alternating magnetic field, eddy current is generated, heat generation is increased, and the efficiency of the device is greatly reduced. Although the cooling structure of the non-metal material can be applied to the inside of the electromagnetic device, the non-metal cooling structure commonly used in the market cannot satisfy both high thermal conductivity and high mechanical strength.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned drawbacks of the prior art and to provide a multi-material composite-molded non-metallic cooling structure, a method for manufacturing the same, and an axial-field motor, wherein the cooling structure can simultaneously ensure high-efficiency cooling performance and good mechanical strength. The purpose of the invention can be realized by the following technical scheme:

according to an object of the present invention, the present invention provides a cooling structure, which includes a housing and a flow channel formed inside the housing, wherein the housing is formed by combining a heat conducting material and a strength material, and a heat exchanging surface is formed on an outer surface of the housing where the heat conducting material is located, so as to contact a member to be cooled.

In a preferred embodiment, the housing is divided into at least one heat conducting member made of the heat conducting material and at least one strength member made of the strength material, and the heat conducting member and the strength member are spliced to form the housing.

In a preferred embodiment, the housing is formed by mixing and injection molding the heat conduction material and the strength material.

As a preferred embodiment, the heat conduction material further comprises at least one reinforcing rib, and the reinforcing rib is arranged on the outer surface and/or the inner surface of the shell where the heat conduction material is located;

and/or the heat exchange piece is composed of at least one heat conduction material, the outer surface and/or the inner surface of the shell where the heat conduction material is located are/is protruded to form the heat exchange piece, and the heat exchange piece located on the outer surface of the shell can be embedded in the piece to be cooled.

As a preferred embodiment, the housing of the cooling mechanism includes at least one stator-opposing plate and at least one rotor-opposing plate, and a plurality of stator holes penetrating the rotor-opposing plate and the stator-opposing plate, the flow channel is formed between the rotor-opposing plate and the stator-opposing plate and surrounds the periphery of each of the stator holes, and at least a part of the stator-opposing plate and/or the rotor-opposing plate is composed of the heat conductive material.

In a preferred embodiment, the stator opposing plate includes an outer ring portion, an inner ring portion, and a plurality of branch portions made of the heat conductive material, the branch portions are connected between the outer ring portion and the inner ring portion, and the plurality of branch portions are circumferentially spaced to form the stator housing hole between two adjacent branch portions.

According to another object of the present invention, there is also provided an axial-field motor, including at least one cooling structure of the above embodiment, the axial-field motor further includes at least one stator and at least one rotor, the stator and the rotor are arranged at intervals along an axis to generate an air gap between the stator and the rotor, and the cooling structure is sleeved on the stator.

According to another object of the present invention, there is also provided a method of manufacturing a cooling structure including a housing, and a flow passage formed inside the housing, the method including the steps of:

and combining a heat conduction material and a strength material to prepare the shell, and forming a heat exchange surface on the outer surface of the shell where the heat conduction material is located so as to be used for contacting a piece to be cooled.

As a preferred embodiment, the method comprises:

providing at least one heat conducting member made of the heat conducting material and at least one strength member made of the strength material;

and carrying out injection molding combination on the heat conducting piece and the strength piece through a mold to obtain the shell.

As a preferred embodiment, the housing further comprises a plurality of reinforcing ribs disposed on an inner surface and/or an outer surface of the heat-conducting member, and the method comprises:

manufacturing the strength piece with the reinforcing ribs;

and combining the side of the strength part with the reinforcing ribs on the heat conducting part in an injection molding manner, so that the reinforcing ribs are arranged on the inner surface and/or the outer surface of the heat conducting part.

As a preferred embodiment, the method comprises:

and mixing the heat conduction material and the strength material, and integrally injecting the mixed heat conduction material and the mixed strength material through a mold to manufacture the shell.

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

the shell of the cooling structure is formed by combining heat conduction materials and strength materials, so that the cooling structure meets the requirements of strength and heat conduction at the same time, the stability and the reliability of the cooling structure are ensured, and a cooling medium is introduced into a flow passage in the shell to effectively cool a part to be cooled. And the heat transfer surface is formed on the outer surface of the shell where the heat conduction materials are located, and the heat transfer surface is in direct contact with the piece to be cooled so that the piece to be cooled and a cooling medium can effectively exchange heat, the strength of the cooling structure is ensured, the heat transfer performance is improved, and efficient cooling is achieved. In addition, the heat conducting material and the strength material of the cooling structure can be non-metal or metal materials to increase the range of use. Furthermore, the shell can be formed by splicing the rigid heat conducting piece and the strength piece or by mixing and injection molding the heat conducting material and the strength material.

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

Drawings

FIG. 1 is a schematic view of a first embodiment of a cooling structure according to the present invention;

FIG. 2 is a schematic structural view of a second embodiment of the cooling structure of the present invention;

FIG. 3 is a schematic structural view of a third embodiment of the cooling structure of the present invention;

FIG. 4 is a schematic structural view of a fourth embodiment of the cooling structure of the present invention;

FIG. 5 is a schematic view of a fifth embodiment of the cooling structure of the present invention;

FIG. 6 is an internal schematic view of the cooling structure of FIG. 5;

FIG. 7 is a schematic structural view of a sixth embodiment of the cooling structure of the present invention;

FIG. 8 is a schematic structural view of a seventh embodiment of the cooling structure of the present invention;

FIG. 9 is a side view of the cooling structure of FIG. 8;

FIG. 10 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 9;

FIG. 11 is a cross-sectional view taken along line B-B of FIG. 9;

FIG. 12 is a flow path schematic of the cooling structure of FIG. 8;

FIG. 13 is a schematic structural diagram of an axial field electric machine according to an embodiment of the present invention;

fig. 14 is a schematic view of the stator structure of the axial field motor of fig. 13 according to the present invention;

fig. 15 is a schematic structural view of a stator core in the axial field motor of fig. 13;

FIG. 16 is a schematic diagram of a coil assembly of the axial field electric machine of FIG. 13;

FIG. 17 is a combined schematic view of a cooling structure and a housing in the axial field electric machine of FIG. 13;

FIG. 18 is a combined schematic view of a stator and a housing of the axial field electric machine of FIG. 13;

FIG. 19 is a schematic structural view of a housing in the axial field electric machine of FIG. 13;

FIG. 20 is a schematic structural view of another embodiment of the stator of the present invention;

fig. 21 is a schematic view of a structure of a stator core in the stator of fig. 20;

FIG. 22 is a combined schematic view of the stator and cooling structure of FIG. 20;

FIG. 23 is a schematic structural view of another embodiment of an axial field electric machine according to the present invention;

fig. 24 is a schematic view of the structure of a stator in the axial field motor of fig. 23;

fig. 25 is a schematic view of a stator core in the axial field motor of fig. 23;

FIG. 26 is a schematic view of a housing of the axial field motor of FIG. 23;

FIG. 27 is a schematic view of a combination of a housing and cooling structure in the axial field electric machine of FIG. 23;

fig. 28 is a schematic structural view of another embodiment of a stator core according to the present invention;

fig. 29 is a combined schematic view of the stator core and cooling structure of fig. 28;

FIG. 30 is a schematic structural view of another embodiment of an axial field electric machine according to the present invention;

FIG. 31 is a combined schematic view of a stator and cooling structure in the axial field electric machine of FIG. 30;

FIG. 32 is a schematic view of a housing of the axial field electric machine of FIG. 30;

fig. 33 is a schematic structural view of another embodiment of the stator core according to the present invention.

Detailed Description

The following description is provided 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.

As shown in fig. 1 to 12, the cooling structures 1300a to 1300g include a housing 1330 and a flow channel 1314 formed inside the housing 1330, the housing 1330 is formed by combining a heat conducting material and a strength material, and a heat exchanging surface is formed on the outer surface of the housing where the heat conducting material is located, so as to contact with a member to be cooled.

The housing 1330 of the cooling structures 1300a to 1300g is made of a heat conductive material and a strength material, so that the cooling structures 1300a to 1300g simultaneously satisfy the requirements of strength and heat conductivity, so as to ensure the stability and reliability of the cooling structures 1300a to 1300g, and a cooling medium is introduced through the flow passage 1314 inside the housing 1330 to effectively cool the to-be-cooled part, wherein the cooling medium comprises a cooling liquid or a cooling gas. And the heat exchange surface is formed on the outer surface of the shell where the heat conduction material is located, and the heat exchange surface is directly contacted with the piece to be cooled, so that the piece to be cooled and a cooling medium can effectively exchange heat, the strength of the cooling structure 1300 a-1300 g is ensured, the heat exchange performance is improved, and efficient cooling is achieved. In addition, the heat conductive material may be made of metal oxide or ceramic, the strength material may be made of polyphenylene sulfide (PPS), fluoropolymer processing aid (PPA), or Polyetheretherketone (PEEK), so as to obtain a cooling structure of nonmetal, and the cooling structure may be applied to an alternating magnetic field.

The shape and the splicing manner of the cooling structure can be varied, and are described in detail by eight embodiments:

first embodiment

As shown in fig. 1, in the cooling structure 1300a of the first embodiment, the housing 1330 is divided into at least one heat conducting member 13301 made of the heat conducting material and at least one strength member 13302 made of the strength material, and the heat conducting member 13301 and the strength member 13302 are spliced to form the housing 1330.

Specifically, the number of the heat-conducting members 13301 and the strength members 13302 is one, the heat-conducting members 13301 are in a straight shape, the strength members 13302 are in an n shape, and the two are spliced to form the housing 1330 having a square cross section. And the inner surfaces of the heat-conducting member 13301 and the strength members 13302 define the flow passage 1314, while the outer surface of the heat-conducting member 13301 forms a heat exchange surface to contact the member to be cooled.

The splicing between the heat conducting piece 13301 and the strength piece 13302 can be splicing, sleeving, clamping, threaded connection or the like.

It should be noted that although the strength members 13302 play a role of lifting the cold area structure 1300a, the strength members 13302 can also realize heat exchange when the cooling structure 1300a is arranged inside the member to be cooled.

Second embodiment

As shown in fig. 2, a cooling structure 1300b of the second embodiment is different from the cooling structure of the first embodiment in that the heat-conducting members 13301 and the strength members 13302 are in a straight shape, the number of the heat-conducting members 13301 and the strength members 13302 is two, the two heat-conducting members 13301 are disposed opposite to each other, the two strength members 13302 are disposed opposite to each other, and the adjacent heat-conducting members 13301 and the strength members 13302 are spliced with each other to form the case 1330 having a square cross section.

Since the number of the heat conduction members 13301 is two, the cooling structure 1300b of the second embodiment has two heat exchange surfaces, i.e., two opposite heat conduction members 13301, the outer surfaces of which form the heat exchange surfaces, respectively. It can be seen that by increasing the number of the heat-conducting members 13301 and setting the corresponding installation positions of the heat-conducting members 13301, the installation of the members to be cooled at different positions on the cooling structure can be performed, thereby increasing the application field.

Third embodiment

As shown in fig. 3, the cooling structure 1300c of the third embodiment is different from the cooling structure of the first embodiment in that the cooling structure 1300c further includes at least one heat exchanging member 1350 formed of the heat conductive material, the heat conductive material is protruded on the outer surface and/or the inner surface of the housing to form the heat exchanging member 1350, and the heat exchanging member 1350 on the outer surface of the housing can be embedded inside the member to be cooled.

Specifically, the heat transfer member 13301, which is made of a heat conductive material, has an inner/outer surface that is protruded to form the heat exchange member 1350, so as to improve heat exchange capability. And the heat exchange member 1350 on the outer surface of the heat conduction member 13001 can be embedded in the member to be cooled so as to increase the heat exchange area of the heat exchange member and the member to be cooled, and further improve the cooling effect of the member to be cooled.

The shape and number of the heat exchanging members 1350 can be set according to actual requirements, for example, the number of the heat exchanging members 1350 arranged on the outer surface of the heat conducting member 13001 is one, and the heat exchanging members 1350 are arranged at the middle position and are embedded in the gap of the member to be cooled.

Fourth embodiment

As shown in fig. 4, the cooling structure 1300d of the fourth embodiment is different from the cooling structure of the first embodiment in that the cooling structure 1300d further includes at least one reinforcing rib 1340, and the reinforcing rib 1340 is disposed on the outer surface and/or the inner surface of the housing where the heat conductive material is located. The reinforcing ribs 1340 are arranged to prevent the cooling structure from deforming, so that the strength of the cooling structure is improved.

Specifically, the heat conductive member 13301, which is composed of a heat conductive material, is provided with reinforcing ribs 1340 at the inner/outer surface thereof. The reinforcing rib 1340 and the strength member 13302 may be made of the same material, and they may be integrally formed, and then they are joined by the strength member 13302 and the heat conductive member 13301, so that the reinforcing rib 1340 is provided on the inner/outer surface of the heat conductive member 13301. For example, the strength member 13302 is n-shaped, and includes a bottom plate and side plates extending upward along two side edges of the bottom plate, wherein a plurality of the reinforcing ribs 1340 are connected between the two side plates, and a plurality of the reinforcing ribs 1340 are arranged at intervals along the length direction of the bottom plate and are close to the upper end portions of the side plates far away from the bottom plate, so that after the heat conducting member 13301 is inserted into the upper end portions of the two side plates, the reinforcing ribs 1340 are located on the inner surface of the heat conducting member 13301. Of course, the reinforcing ribs 1340 may be divided into upper and lower sides, and the heat conduction member 13301 passes through the reinforcing ribs 1340 at the upper and lower sides, so that the reinforcing ribs 1340 are disposed on the inner/outer surface of the heat conduction member 13301.

Fifth embodiment

As shown in fig. 5, a cooling structure 1300e of the fifth embodiment is different from the cooling structure of the first embodiment in that a housing 1330 of the cooling structure 1300e includes at least a stator opposing plate 1332 and at least a rotor opposing plate 1331, and a plurality of stator housing holes 1313 penetrating the rotor opposing plate 1331 and the stator opposing plate 1332, the flow channel 1314 being formed between the rotor opposing plate 1331 and the stator opposing plate 1332 and surrounding each of the stator housing holes 1313, and at least a portion of the stator opposing plate 1332 and/or the rotor opposing plate 1331 is composed of the heat conductive material.

The to-be-cooled member may be a stator 1000a to 1000e and a rotor 2000 of an axial magnetic field motor, as shown in fig. 13 to 33, the stator 1000a to 1000e includes a stator core 1100a to 1100e, the stator core 1100a to 1100e includes a plurality of tooth blocks 1120 arranged circumferentially at intervals, and an air gap is maintained between each tooth block 1120 and the rotor 2000. The cooling structure 1300e is sleeved on the stator core 1100 in a one-to-one correspondence manner through the stator sleeve holes 1312 and the tooth blocks 1120, the rotor opposite plate 1331 of the housing 1330 is disposed close to and faces the rotor 2000, and the stator opposite plate 1332 faces a side facing away from the rotor 2000, at this time, the flow channel 1314 formed between the rotor opposite plate 1331 and the stator opposite plate 1332 surrounds each tooth block 1120 to effectively cool the stator cores 1100a to 1100e, and the rotor opposite plate 1331 is close to and faces the rotor 2000, so that the cooling structure 1300e cools the stators 1000a to 1000e, and simultaneously, the rotor 2000 can be cooled, the heat transfer paths between the rotor 2000 and the stators 1000a to 1000e and the cooling structure 1300e are shortened, and further, the heat dissipation effect is effectively improved, so as to ensure the reliable operation of the motor. And through having left out the setting of casing water course, can simplify the structure to processing degree of difficulty and cost have been reduced.

Specifically, the number of the stator opposing plate 1332 and the rotor opposing plate 1331 is one, and the distance between the two determines the thickness of the cooling structure 1300e, and referring to fig. 5, the cooling structure 1300e of the fifth embodiment is substantially in the shape of a flat disk, which can ensure the advantage of small axial size of the axial field motor.

With continued reference to fig. 5, the stator opposing plate 1332 includes an outer ring part 13321, an inner ring part 13322 and a plurality of branch parts 13323 made of the heat conductive material, the branch parts 13323 are connected between the outer ring part 13321 and the inner ring part 13322, and the plurality of branch parts 13323 are circumferentially spaced to form the stator casing holes 1313 between two adjacent branch parts 13323. Referring to fig. 5 and 13, the branch portions 13323 may abut against the yoke disk 1110 of the stator cores 1100a to 1100e or abut against the coil assembly 1200 sleeved on the tooth blocks 1120, and only the branch portions 13323 may employ a heat conducting member 13301, and the outer ring portion 13321 and the inner ring portion 13322 employ a strength member 13302 to exchange heat with the yoke disk 1110 and the coil assembly 1200. Of course, the outer ring part 13321 and the inner ring part 13322 may be partially made of the heat conduction member 13301, and may be selected according to actual needs.

Referring to fig. 6, the flow passage 1314 includes an outer ring flow passage 13141, an inner ring flow passage 13142, and several branch flow passages 13143 connected between the outer ring flow passage 13141 and the inner ring flow passage 13142, and the stator housing 1313 is formed between two adjacent branch flow passages 13143.

Specifically, the inner ring flow channel 13142 and the outer ring flow channel 13141 are arranged from inside to outside, and the plurality of branch flow channels 13143 are circumferentially arranged at intervals, so that the stator trepan 1313 is formed between two adjacent branch flow channels 13143, after the tooth blocks of the stator core are inserted into the stator trepan 1313, the inner ring flow channel 13142 and the outer ring flow channel 13141 are correspondingly arranged on two radial sides of the tooth blocks, and two circumferential sides of the tooth blocks respectively correspond to the branch flow channels 13143, so that the flow channels 1314 surround the tooth blocks, and further the heat dissipation performance of the stator core is improved. Wherein the stator bore 1313 and the tooth block are adapted in shape, for example both in the shape of a sector, see fig. 6.

With continued reference to FIG. 6, a plurality of baffles 1315 are disposed within the outer ring flow passage 13141 and the inner ring flow passage 13142, respectively, and the baffles 1315 are staggered within the outer ring flow passage 13141 and the inner ring flow passage 1314. This enables the cooling medium to flow back and forth between the outer ring flow passage 13141 and the inner ring flow passage 1314 through the branch flow passages 13143, reducing the flow resistance to some extent, thereby enhancing the heat dissipation effect.

The blocking member 1315 located in the outer ring flow passage 13141 is located between two adjacent branch flow passages 13143, so that the cooling medium can be blocked from passing through, and the cooling medium enters the inner ring flow passage 13142 along the branch flow passages 13143, is blocked by the blocking member 1315 in the inner ring flow passage 13142, enters the outer ring flow passage 13141 through the other branch flow passage 13143, and circulates so that the cooling medium sequentially passes through the flow passage 1314 in the circumferential direction, so as to achieve the flow of the cooling medium.

With continued reference to FIG. 6, the outer annular flow passage 13141 extends outwardly to form adjacent port sections 1316, and the port sections 1316 are separated by a partition 13163 to form adjacent inlet portions 13161 and outlet portions 13162. The inlet 13161 and the outlet 13162 are blocked by the partition 13163, so that the cooling medium introduced from the inlet 13161 can only pass through the flow path 1314 counterclockwise and then be introduced from the outlet 13162, and since the inlet 13161 and the outlet 13162 are adjacent and concentrated, the cooling contact area of the flow path 1314 is increased, and the cooling performance is improved.

The cooling structure 1300e of the fifth embodiment can be applied to a single-rotor single-stator, single-rotor double-stator axial field motor.

Sixth embodiment

As shown in fig. 7, a cooling structure 1300f of a sixth embodiment is different from the cooling structure of the fifth embodiment in that a branch portion 13323 of the stator opposite plate 1332 protrudes outward to form a heat exchanging member 1350, and when the branch portion 13323 abuts on the coil assembly 1200, the heat exchanging member 1350 can be embedded between two adjacent coil assemblies 1200, so as to increase a heat exchanging area, and further improve the heat exchanging capability, referring to fig. 13.

Seventh embodiment

As shown in fig. 8 to 12, a cooling structure 1300g of a seventh embodiment is different from the cooling structure of the fifth embodiment in that the number of the stator facing plates 1332 and the rotor facing plates 1331 is two, each of the stator facing plates 1332 and the rotor facing plates 1331 constitutes a cooling disc 1310, and it can be seen that the cooling structure 1300g of the seventh embodiment has two cooling discs 1310, and at the same time, the cooling structure 1300g also has a stator facing plate 1332 connecting the two cooling discs such that the rotor facing plates 1311 of the two cooling discs 1310 are externally positioned, and the stator housing holes 1313 of the two cooling discs 1310 are in one-to-one correspondence.

The cooling structure 1300g of the seventh embodiment can be applied to an axial magnetic field motor with a dual rotor and a single stator, wherein the stator can be sleeved outside the connecting pipe 1320 and is disposed between the two cooling plates 1310, in this case, two axial sides of the stator respectively correspond to the stator opposing plate 1332 of the cooling plates 1310 on two sides, and two rotors correspond to the rotor opposing plate 1331 of each cooling plate 1310.

The cooling structure 1300g of the seventh embodiment may be the same as the fifth embodiment in that each of the cooling plates 1310 is independently introduced and extracted with the cooling medium, but the cooling medium flows back and forth between the two cooling plates 1310 through the connection pipe 1320 to increase the contact area of the cooling medium with the stator, thereby improving the cooling performance. Referring to fig. 10 to 12, a plurality of barriers 1315 are respectively disposed in the outer ring flow passage 13141 and the inner ring flow passage 13142, and the barriers 1315 in the outer ring flow passage 13141 and the inner ring flow passage 13142 are oppositely disposed to divide the flow passage 1314 into a plurality of circumferentially arranged chambers 13140, and the chambers 13140 in the two cooling discs 1310 are circumferentially staggered and communicated with each other through the connecting pipes 1320, so that the cooling medium sequentially passes through the chambers 13140 of the two cooling discs 1310 back and forth.

Specifically, the connecting pipe 1320 is divided into a plurality of pipe portions 1322 along the circumferential direction, and referring to fig. 12, since the chambers 13140 of the two cooling plates 1310 are arranged in a staggered manner along the circumferential direction, the chambers 13140 of one cooling plate 1310 are respectively connected with the two pipe portions 1322 to be correspondingly connected with the two chambers 13140 of the other cooling plate 1340, so that the cooling medium flows back and forth in the chambers 13140 of the two cooling plates 1310 through the pipe portions 1322 in sequence, and since the stator is sleeved outside the connecting pipe 1320, the inside of the stator can also be heat-transferred through the pipe portions 1322.

As shown in fig. 10 and 11, the connection pipe 1320 is connected to the inner ring flow passage 13142 to form an inlet 13144 and an outlet 13145 corresponding to each of the inner ring flow passages 13142 of the two cooling pans 1310, and is located on the same inner ring flow passage 13142, and the adjacent inlet 13144 and outlet 13145 are blocked.

Further, the inlet 13144 and the outlet 13145 correspond to two ends of the pipe part 1322, and referring to fig. 12, that is, after the cooling medium in the outer ring flow passage 13141 flows to the inner ring flow passage 13142 through the branch flow passage 13143, the cooling medium enters the pipe part 1322 through the outlet 13145 thereon, and then enters the chamber 13140 of the other cooling plate 1310, specifically enters from the inlet 13144 of the inner ring flow passage 13142 of the chamber 13140, and then flows to the outer ring flow passage 13141 through the branch flow passage 13143, so that the cooling medium circulates through the pipe part 1322 to and fro in the chambers 13140 of the two cooling plates 1310 in sequence.

Further, the inlet 13144 and the outlet 13145 are spaced apart from each other on the same inner ring flow path 13142, and a baffle 1317 for blocking is provided between the inlet 13144 and the outlet 13145. Wherein each chamber 13140 corresponds to one inlet 13144 and one outlet 13145, respectively, and the inlet 13144 and the outlet 13145 correspond to two chambers 13140 of the other cooling plate 1310, respectively. And a baffle 1317 is provided between the inlet 13144 and the outlet 13145 to prevent the cooling medium from flowing directly through the inlet 13144 and the outlet 13145 without flowing on the outer ring flow path 13141 and the branch flow path 13143 to affect the cooling performance. Specifically, the cooling medium introduced from the inlet 13144 can flow only to the outer ring flow passage 13141 through the branch flow passage 13143 and then to the discharge port 13145 through the other branch flow passage 13143 because of the blocking of the baffle 1317, so that the cooling medium can have a flow effect on all of the outer ring flow passage 13141, the inner ring flow passage 13142, and the branch flow passage 13143.

As shown in fig. 8 to 12, the outer annular flow passage 13141 of the cooling plates 1310 extends outward to form inlet and outlet sections 1316, wherein the inlet and outlet sections 1316 of one of the cooling plates 1310 are used for leading out the cooling medium, and the inlet and outlet sections 1316 of the other cooling plate 1310 are used for leading in the cooling medium.

It should be noted that the inlet and outlet section 1316 for the introduction of the cooling medium communicates with the chamber 13140 of the cooling plate 1310, and the inlet 13144 of the chamber 13140 is removed, that is, the inlet 13144 of the chamber 13140 is replaced by the inlet and outlet section 1316 for the introduction of the cooling medium. Similarly, the port section 1316 for the exit of cooling medium communicates with the chamber 13140 of the cooling plate 1310, and the outlet 13145 of the chamber 13140 is eliminated.

As shown in fig. 9, the connection pipe 1320 is divided into two pipes 1321 from the middle, and each of the pipes 1321 is correspondingly connected to one of the cooling plates 1310, so that the two cooling plates 1310 pass through the pipes 1321, respectively, and are inserted from both ends of the stator, so as to facilitate assembly. Wherein two can adopt modes such as joint, cup joint to connect between the body 1321, can add seal structure such as sealing washer even to promote sealing performance, prevent that coolant from leaking.

Eighth embodiment

In the cooling structure of the eighth embodiment, the housing 1330 is formed by injection molding the heat conductive material and the strength material.

The heat conduction material and the strength material can be mixed according to a certain proportion and are subjected to injection molding through a mold, so that the heat conduction material and the strength material can meet the requirements of strength and heat conductivity at the same time. At this time, the reinforcing ribs 1340 and the heat exchanging members 1350 may be disposed on the inner/outer surface of the housing 1330, respectively, and the positions of the reinforcing ribs 1340 and the heat exchanging members 1350 may be set as desired.

In summary, the housing 1330 of the cooling structures 1300a to 1300g is formed by combining a heat conducting material and a strength material, so that the cooling structures 1300a to 1300g simultaneously satisfy the requirements of strength and heat conductivity, so as to ensure the stability and reliability of the cooling structures 1300a to 1300g, and the cooling medium is introduced into the flow passage 1314 inside the housing 1330 to effectively cool the to-be-cooled part. And the heat exchange surface is formed on the outer surface of the shell where the heat conduction material is located, and the heat exchange surface is directly contacted with the piece to be cooled, so that the piece to be cooled and a cooling medium can effectively exchange heat, the strength of the cooling structure 1300 a-1300 g is ensured, the heat exchange performance is improved, and efficient cooling is achieved. In addition, the heat conductive material and the strength material of the cooling structures 1300a to 1300g may be non-metallic or metallic materials to increase the range of use. Furthermore, the housing 1300 may be formed by splicing the hard heat conducting member 13301 and the strength member 13302, or by mixing and injecting the heat conducting member and the strength member.

The invention also provides a manufacturing method of the cooling structure, which comprises the following specific contents:

ninth embodiment

As shown in fig. 1 to 12, the cooling structures 1300a to 1300g include a housing 1330, and a flow path 1314 formed inside the housing 1330, and the manufacturing method includes the following steps:

the housing 1330 is made by combining a thermally conductive material and a strength material, and a heat exchange surface is formed on an outer surface of the housing where the thermally conductive material is located, so as to contact a member to be cooled.

By adopting the method, the cooling structure which has the characteristics of the heat conduction material and the strength material is manufactured, namely, the requirements of strength and heat conduction are met simultaneously, and the stability and the reliability of the cooling structure are ensured. The method for manufacturing the cooling structure can be used to manufacture the cooling structure of the first to eighth embodiments, and specific contents thereof can refer to the above embodiments, which are not described herein again.

The method comprises the following steps:

providing at least one heat conducting piece 13301 made of the heat conducting material and at least one strength piece 13302 made of the strength material;

the heat conductive member 13301 and the strength member 13302 are injection-molded and combined by a mold to manufacture the housing 1330.

Specifically, the heat conductive member 13301 may be formed, and then placed in an injection mold, and then a strength material may be placed in the injection mold, so as to be integrally injection-molded with the strength member 13302 connected to the heat conductive member 13301.

Further, the housing 1330 further includes a plurality of ribs 1340, the ribs 1340 are disposed on the inner surface and/or the outer surface of the heat conducting member 13301, and the method includes:

manufacturing the strength piece 13302 with the reinforcing ribs 1340;

the side of the strength member 13302 having the reinforcing rib 1340 is injection-molded and coupled to the heat conductive member 13301, so that the reinforcing rib 1310 is disposed on the inner surface and/or the outer surface of the heat conductive member 13301.

In addition, the method comprises:

the heat conductive material and the strength material are mixed, and the mixed heat conductive material and strength material are integrally injection-molded by a mold to manufacture the housing 1330.

As shown in fig. 13 and 33, the axial magnetic field motor includes at least one cooling structure 1300a to 1300g of the above-mentioned embodiment, and further includes at least one stator 1000a to 1000e and at least one rotor 2000, the stator 1000a to 1000e and the rotor 2000 are arranged at intervals along an axis to generate an air gap between the stator 1000a to 1000e and the rotor 2000, and the cooling structure 1300a to 1300g is sleeved on the stator 1000a to 1000 e.

Since the axial field motor employs the cooling structures 1300a to 1300g of the above embodiments, the advantageous effects of the axial field motor can be referred to the cooling structures 1300a to 1300g of the above embodiments. The axial magnetic field motor may be divided into a single-rotor single-stator motor, a single-rotor double-stator motor, a double-rotor single-stator motor, and the like according to the difference in the number of the stators 1000a to 1000e and the number of the rotors 2000. The following is detailed by six examples:

tenth embodiment

As shown in fig. 13 to 19, the axial flux electric machine includes two stators 1000a, a rotor 2000 and two cooling structures 1300e of the fifth embodiment, wherein the rotor 2000 is air-gap retained between the two stators 1000a, so that the axial flux electric machine forms a single-rotor double-stator electric machine

Specifically, the stator 1000a includes a stator core 1100a and a plurality of coil assemblies 1200, the stator core 1100a includes a yoke plate 1110 and a plurality of tooth blocks 1120, the tooth blocks 1120 are circumferentially spaced on the yoke plate 1110, a coil assembly 1200 is sleeved outside each tooth block 1120, the cooling structure 1300e is sleeved on the stator core 1100a in a manner that the stator sleeve holes 1313 and the tooth blocks 1120 are in one-to-one correspondence, the stator opposing plate 1332 of the cooling structure 1300e is disposed toward the yoke plate 1110, and the rotor opposing plate 1331 is disposed toward the rotor 2000, so that heat of the rotor 2000 is transferred to the cooling structure 1300e through an air gap, and heat transfer cooling is achieved by the cooling structure 1300e, referring to fig. 5.

Referring to fig. 15, the yoke plate 1110 has a ring shape, the tooth blocks 1120 are extended and connected to the inner and outer edges of the yoke plate 1110, and the tooth blocks 1120 are matched with the shape of the stator housing 1313, and have a fan shape, referring to fig. 5.

Referring to fig. 14, the coil assembly 1200 is adapted to the shape of the tooth block 1120 in a fan-shaped annular structure to surround the tooth block 1120. Wherein the height of the tooth block 1120 is higher than that of the coil assembly 1200, such that when the coil assembly 1200 is sleeved on the tooth block 1120, the protruding portion of the tooth block 1120 relative to the coil assembly 1200 is correspondingly inserted into the stator sleeve hole 1313 of the cooling structure 1300e, so that the stator opposing plate 1332 of the cooling structure 1300e abuts against the coil assembly 1200, and the coil assembly 1200 is located between the yoke disc 1110 and the cooling structure 1300e, referring to fig. 13. It can be seen that there is a corresponding contact between the tooth block 1120 and the coil assembly 1200 and the cooling structure 1300e, respectively, to improve the heat dissipation performance of the core winding. And the cooling structure 1300e plays a role of preventing the coil from being separated from the stator core 1100a, i.e., a slot wedge structure is omitted, motor parts are reduced, cost is reduced, and assembly efficiency is effectively improved, compared with the prior art.

Of course, the axial-field motor according to the tenth embodiment may adopt the cooling structure 1300c according to the sixth embodiment, and the branch portions 13323 of the stator opposing plate 1332 protrude outward to form heat exchanging elements 1350, and the heat exchanging elements 1350 can be embedded between two adjacent coil assemblies 1200, so as to increase the heat exchanging area, and further improve the heat exchanging capability, as shown in fig. 13.

Referring to fig. 16, the coil assembly 1200 includes a coil 1201, and an insulating and heat conducting structure may be disposed between the coil 1201 and the cooling structure 1300e to ensure insulation, heat transfer, and the like between the coil 1201 and the cooling structure 1300e. With continued reference to fig. 16, the insulating and heat conducting structure may also be an insulating paper 1202, and two circumferential sides of the coil 1201 are respectively wrapped by the insulating paper 1202, so that insulation between the coil 1201 and the cooling structure 1300e is ensured, and heat of the coil 1201 can be transferred to the cooling structure 1300e through the insulating paper 1202.

As shown in fig. 13 and 17 to 19, the axial magnetic field motor further includes a housing 3000, the housing 3000 includes two housings 3001, each housing 3001 includes a bottom plate 3100 and an outer plate 3200 extending along an outer edge of the bottom plate 3100, each housing 3001 is correspondingly fixed with a stator 1000a, the stator 1000a is located in an area surrounded by the outer plates 3200, and is fixed on the bottom plate 3100 through a yoke disc 1110 of the stator core 1100a, and the two housings 3001 are fixed by abutting the outer plates 3200 relatively in a manner that the bottom plate 3100 is externally disposed. The yoke disk 1110 may be fixed on the bottom plate 3100 by bolts, so that the cooling structures 1300e are disposed outside the housing 3001 relative to the stators 1000a, such that when the two housings 3001 are fixed by the outer plate 3200 in an abutting manner, one cooling structure 1300e exists between the rotor 2000 and each of the stators 1000a, so that both sides of the rotor 2000 can contact different cooling structures 1300e, thereby improving heat dissipation performance. The two housings 3001 may be fixed by bolts or the like, but not limited thereto.

The outer annular flow passage 13141 extends outward to form adjacent inlet and outlet sections 1316, the inlet and outlet sections 1316 are separated by a partition 13163 to form adjacent inlet portions 13161 and outlet portions 13162, and a bayonet 3201 through which the inlet and outlet sections 1316 penetrate is formed in the outer side plate 3200. The bayonet 3201 not only enables the inlet/outlet section 1316 to be led out, but also pre-fixes the cooling structure 1300e to ensure the reliability and stability after assembly.

The casing 3000 further includes an inner plate 3300 and the supporting blocks 3400, the inner plate 3300 is sleeved inside the stator 1000a, the supporting blocks 3400 are disposed on the inner wall of the outer plate 3200, and the cooling structure 1300e is supported and fixed on the inner plate 3200 and/or the supporting blocks 3400. Referring to fig. 13, the stator 1000a is positioned between the inner plate 3300 and the outer plate 3200, and the cooling structure 1300e may abut against the inner plate 3200 and/or the support block 3400 and be fastened by bolts. Referring to fig. 5, the cooling structure 1300e is provided with mounting holes 1318 for bolts to pass through, the mounting holes 1318 are specifically located at positions corresponding to the outer ring flow path 13141 and the inner ring flow path 13142, that is, the outer ring flow path 13141 abuts against the plurality of support blocks 3400 arranged at intervals on the circumference, and the inner ring flow path 13142 abuts against the inner panel 3200.

As shown in fig. 19, a plurality of the supporting blocks 3400 are disposed at intervals on the inner wall of the outer panel 3200, but of course, a plurality of the supporting blocks 3400 may be sequentially connected to form a continuous ring structure to ensure the stability of the fixing of the cooling structure 1300e.

Eleventh embodiment

As shown in fig. 20 to 22, an axial-flux motor according to an eleventh embodiment is different from the tenth embodiment in that the stator 1000b includes a stator core 1100b having a plurality of tooth blocks 1120, two circumferential sides of the tooth blocks 1120 are recessed to form recesses 1121, the coil assemblies 1200 are embedded in the recesses 1121, and the cooling structure 1300e is engaged between two adjacent coil assemblies 1200, so that the stator opposing plate 1332 of the cooling structure 1300e abuts against the yoke disc 1110. The contact areas between the cooling structure 1300e and the stator core 1100b and the coil assembly 1200, respectively, are further increased, thereby further improving heat dissipation performance.

Referring to fig. 21, the recess 1121 extends from a position where the tooth block 1120 is connected to the yoke plate 1110 and in a height direction of the tooth block 1120, wherein the extension height of the recess 1121 is smaller than the height of the tooth block 1120, so that the tooth block 1120 can also contact the cooling structure 1300e when the cooling structure 1300e is engaged between two adjacent coil assemblies 1200.

The coil 1201 of the coil assembly 1200, the insulating and heat conducting structure between the coil assembly and the cooling structure 1300e, may be made of a high heat conducting aluminum oxide thin plate or coating, and the bonding surface is filled with a heat conducting silicone grease or heat conducting glue.

Twelfth embodiment

As shown in fig. 23 to 27, an axial-flux motor according to a twelfth embodiment is different from the tenth embodiment in that a stator 1000c includes a stator core 1100c, the stator core 1100c includes a plurality of tooth blocks 1120 circumferentially arranged at intervals, and a yoke plate 1110, and the yoke plate 1110 is connected to a middle position of both axial end surfaces of each tooth block 1120. A coil assembly 1200 is respectively sleeved on two axial sides of the tooth block 1120, the coil assembly 1200 abuts against the stator 1110, and a cooling structure 1300e is respectively sleeved on two axial sides of the stator 1000 c. In addition, the axial-flux motor of the twelfth embodiment has two rotors 2000, and the stator 1000c is air-tightly held between the two rotors 2000, so that the axial-flux motor forms a double-rotor single-stator motor.

Wherein, each rotor 2000 corresponds to one rotor opposite plate 1331 of the cooling structure 1300e, and heat of the rotor 2000 is transferred to the corresponding cooling structure 1300e through an air gap, and the cooling structure 1300e realizes heat transfer cooling.

As shown in fig. 23, 26 and 27, the casing 3000 includes an outer plate 3200 and two bottom plates 3100, wherein two ends of the outer plate 3200 are respectively opened with bayonets 3201, an outer annular flow channel 13141 of the cooling structures 1300e extends outward to form inlet and outlet sections 1316, the two cooling structures 1300e are respectively engaged with the bayonets 3201 at two ends of the outer plate 3200 through the inlet and outlet sections 1316, so that the two integrally connected stators 1000c are fixed between the two cooling structures 1300e, and two ends of the outer plate 3200 are closed by the bottom plates 3100.

As shown in fig. 23 to 27, the casing 3000 further includes an inner plate 3300 and the supporting blocks 3400, the inner plate 3300 is sleeved inside the stator 1000c, the supporting blocks 3400 are disposed on an inner wall of the outer plate 3200, and the cooling structure 1300e is supported and fixed on the inner plate 3200 and/or the supporting blocks 3400. The support blocks 3400 are continuous annular structures, so that the two cooling structures 1300e respectively abut against the support blocks 3400 and two sides of the inner side plate 3200.

As shown in fig. 27, the axial magnetic field motor further includes a rotating shaft, the rotating shaft penetrates through the centers of the stator 1000c and the inner side plate 3300, and is rotatably disposed inside the casing 3000, for example, two ends of the rotating shaft are respectively rotatably connected to the bottom plate 3100. The rotor 2000 is fixed to the rotation shaft.

Thirteenth embodiment

As shown in fig. 28 and 29, an axial-flux motor according to a thirteenth embodiment is different from the twelfth embodiment in that a stator 1000d includes a stator core 1100d, the stator core 1100d includes a plurality of tooth blocks 1120 circumferentially arranged at intervals, and a yoke plate 1110, and the yoke plate 1110 is connected to a middle position of both axial end surfaces of each tooth block 1120. A coil assembly 1200 is respectively sleeved on two axial sides of the tooth block 1120, and the coil assembly 1200 is embedded in the recess 1121 of the tooth block 1120, so that the stator opposing plate 1332 of the cooling structure 1300e abuts against the yoke disc 1110. The contact areas between the cooling structure 1300e and the stator core 1100b and the coil assembly 1200, respectively, are further increased, thereby further improving heat dissipation performance.

Fourteenth embodiment

As shown in fig. 30 to 32, an axial-field motor of a fourteenth embodiment is different from the twelfth embodiment in that a stator core 1100e of the stator 1000e includes only a plurality of circumferentially spaced tooth blocks 1120 without a yoke disc 1110.

In addition, a plurality of blocking strips 3210 are arranged on the inner wall of the outer panel at intervals, so that the tooth block 1120 is blocked between two adjacent blocking strips 3210, as shown in fig. 30 and 32. Specifically, the tooth block 1120 passes through between two adjacent locking strips 3210, and the surface of the tooth block 1120 is smooth, so that after the two cooling structures 1300e are sleeved on the tooth block 1120 and clamped at two ends of the outer side plate, the two coil assemblies 1200 sleeved on the tooth block 1120 can be respectively arranged at two sides of the locking strips 3210, and the coil assembly 1200 at each side can be positioned between the cooling structure 1300e and the locking strips 3210, thereby not only omitting a positioning structure, making the structure more compact, reducing the cost, but also improving the reliability and stability of the structure.

Fifteenth embodiment

As shown in fig. 33, an axial-flux motor according to a fifteenth embodiment differs from the fourteenth embodiment in that a cooling structure 1300g according to the seventh embodiment is employed.

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

Claims

1. A cooling structure (1300 a-1300 g), wherein the cooling structure (1300 a-1300 g) comprises a housing (1330) and a flow passage (1314) formed inside the housing (1330), the housing (1330) is formed by combining a heat conduction material and a strength material, and a heat exchange surface is formed on the outer surface of the housing where the heat conduction material is located, so as to be used for contacting with a member to be cooled.

2. The cooling structure (1300 a-1300 g) of claim 1, wherein the housing (1330) is divided into at least one heat conducting member (13301) made of the heat conducting material and at least one strength member (13302) made of the strength material, and the heat conducting member (13301) and the strength member (13302) are spliced to form the housing (1330).

3. The cooling structure (1300 a-1300 g) of claim 1, wherein the housing (1330) is injection molded from a mixture of the thermally conductive material and the strength material.

4. The cooling structure (1300 a-1300 g) of claim 1, further comprising at least one rib (1340) disposed on an outer surface and/or an inner surface of the housing where the thermally conductive material is located;

and/or, the heat exchange device also comprises at least one heat exchange member (1350) which is composed of the heat conduction material, the outer surface and/or the inner surface of the shell body where the heat conduction material is positioned is/are raised so as to form the heat exchange member (1350), and the heat exchange member (1350) positioned on the outer surface of the shell body can be embedded in the member to be cooled.

5. The cooling structure (1300 a-1300 g) of claim 1, wherein the housing (1330) of the cooling mechanism (1300 e, 1300 f) comprises at least a stator opposing plate (1332) and at least a rotor opposing plate (1331), and a plurality of stator housing holes (1313) extending through the rotor opposing plate (1331) and the stator opposing plate (1332), the flow channel (1314) being formed between the rotor opposing plate (1331) and the stator opposing plate (1332) and surrounding each of the stator housing holes (1313), at least a portion of the stator opposing plate (1332) and/or the rotor opposing plate (1331) being comprised of the thermally conductive material.

6. An axial field machine, comprising at least one cooling structure (1300 a-1300 g) according to any one of claims 1 to 5, the axial field machine further comprising at least one stator (1000 a-1000 e) and at least one rotor (2000), the stator (1000 a-1000 e) and the rotor (2000) being axially spaced apart to create an air gap between the stator (1000 a-1000 e) and the rotor (2000), the cooling structure (1300 a-1300 g) being disposed around the stator (1000 a-1000 e).

7. A method of manufacturing a cooling structure, the cooling structure (1300 a-1300 g) comprising a housing (1330), and a flow channel (1314) formed inside the housing (1330), characterized in that the method comprises the steps of:

the housing (1330) is made by combining a thermally conductive material and a strength material, and a heat exchange surface is formed on an outer surface of the housing where the thermally conductive material is located for contacting a member to be cooled.

8. The method of manufacturing of claim 7, wherein the method comprises:

providing at least one thermally conductive member (13301) comprised of said thermally conductive material and at least one strength member (13302) comprised of said strength material;

the heat conductive member (13301) and the strength member (13302) are injection-bonded through a mold to manufacture the housing (1330).

9. The method of manufacturing of claim 8, wherein the housing (1330) further comprises a plurality of ribs (1340), the ribs (1340) being disposed on an inner surface and/or an outer surface of the heat conductive member (13301), the method comprising:

making the strength member (13302) with the reinforcing ribs (1340);

and (3) injection-molding and combining one side of the strength member (13302) with the reinforcing ribs (1340) on the heat-conducting member (13301) so that the reinforcing ribs (1310) are arranged on the inner surface and/or the outer surface of the heat-conducting member (13301).

10. The method of manufacturing of claim 7, wherein the method comprises:

the heat conductive material and the strength material are mixed, and the mixed heat conductive material and strength material are integrally injection-molded by a mold to manufacture the housing (1330).