Axial flux permanent magnet motor with composite cooling structure

Abstract

The invention relates to the technical field of axial magnetic flux permanent magnet motor cooling, and provides an axial magnetic flux permanent magnet motor with a composite cooling structure, which comprises a shell provided with a stator oil inlet, a stator oil outlet and a shell oil outlet; the stator assembly is installed in the shell, and a stator winding module of the stator assembly is wound on a stator iron core module of the stator assembly; the stator assembly and the shell jointly form a stator cooling channel, the stator cooling channel is communicated with the stator oil inlet and the stator oil outlet, and the stator cooling channel flows through the stator winding module; the rotor assembly is connected with the shell through the bearing assembly; the rotor assembly and the shell jointly form a rotor cooling channel, the rotor cooling channel is communicated with the machine shell oil outlet, and the rotor cooling channel flows through the permanent magnets of the rotor assembly. The scheme that cooling oil is in direct contact with a heat source of the motor is adopted, and the cooling efficiency of the motor is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of cooling of axial flux permanent magnet motors, and in particular to an axial flux permanent magnet motor with a composite cooling structure. Background Art

[0002] Compared with radial flux permanent magnet motors, axial flux permanent magnet motors have a more compact axial structure, higher power density and torque density.

[0003] For a single-stator, dual-rotor, yokeless axial flux motor, its structure is a stator in the middle and rotors on both sides. The stator core, windings and permanent magnets on both sides of the rotors serve as the main heat sources of the motor. The heat generated by the three will increase the internal temperature of the motor. Excessive motor temperature will not only cause the motor to exceed the allowable operating temperature, but also cause demagnetization of the permanent magnets, directly affecting the performance of the motor.

[0004] The cooling methods commonly used for motors are air cooling and liquid cooling. Motor liquid cooling mainly includes water cooling and oil cooling. The cooling effect of liquid cooling is significantly stronger than that of air cooling. However, the current cooling technology is limited in that most can only set cooling channels on the casing or end cover, which makes it difficult to remove the heat inside the motor and produce a good cooling effect, thus hindering the development of high power density and high torque of the motor.

[0005] The cooling effect of the cooling structure of the existing axial flux permanent magnet motor is poor. How to improve the cooling structure of the axial flux permanent magnet motor and provide an axial flux permanent magnet motor with a composite cooling structure has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The object of the present invention is to provide an axial flux permanent magnet motor with a composite cooling structure to solve the problem of poor cooling effect of the cooling structure of the existing axial flux permanent magnet motor in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to a first aspect of the present invention, an axial flux permanent magnet motor with a composite cooling structure is provided, comprising: a shell, the shell having a stator oil inlet, a stator oil outlet and a casing oil outlet; a stator assembly, the stator assembly is installed in the shell, and the stator winding module of the stator assembly is wound on the stator core module of the stator assembly; the stator assembly and the shell together form a stator cooling channel, the stator cooling channel is connected to the stator oil inlet and the stator oil outlet, and the stator cooling channel flows through the stator winding module; a rotor assembly and a bearing assembly, the rotor assembly is connected to the shell through the bearing assembly; the rotor assembly and the shell together form a rotor cooling channel, the rotor cooling channel is connected to the casing oil outlet, and the rotor cooling channel flows through the permanent magnet of the rotor assembly.

[0008] Furthermore, the stator assembly includes a first stator bracket, a second stator bracket, a stator winding module and a stator core module; a plurality of stator core modules are arranged in a circumferentially spaced relationship in the shell, a stator winding module is correspondingly wound around the outer side of each stator core module, and the first stator bracket and the second stator bracket are respectively arranged on both sides of the plurality of stator core modules and the plurality of stator winding modules in the axial direction; the first stator bracket and the second stator bracket are fixedly connected by stator bracket fixing screws.

[0009] Furthermore, the stator oil inlet and the stator oil outlet are adjacently arranged on the side wall of the shell, the stator oil inlet includes a first oil inlet and a second oil inlet, and the stator oil outlet includes a first oil outlet and a second oil outlet; the multiple stator winding modules include a first stator winding module close to the stator oil inlet, a second stator winding module close to the stator oil outlet, and a plurality of third stator winding modules located between the first stator winding module and the second stator winding module; the stator assembly also includes a winding partition, a short partition, a long partition, a first shunt block and a second shunt block installed between the first stator bracket and the second stator bracket; wherein a first shunt block is arranged between the first stator winding module and the shell, and the first shunt block is located between the first oil inlet and the second oil inlet; a second shunt block is arranged between the second stator winding module and the shell, and the second shunt block is located between the first oil outlet and the second oil outlet; a long partition is arranged between the first stator winding module and the second stator winding module, and one end of the long partition It extends to the first stator bracket and the second stator bracket, and the other end of the long partition extends to the shell; a winding partition is connected between the side rear end of the first stator winding module and the side rear end of the third stator winding module adjacent to it, a winding partition is connected between the side rear end of the second stator winding module and the side rear end of the third stator winding module adjacent to it, and a winding partition is connected between the side rear ends of each adjacent two third stator winding modules; a short partition is arranged between the first stator winding module and the third stator winding module adjacent to it; a short partition is arranged between the second stator winding module and the third stator winding module adjacent to it; a short partition is arranged between each two adjacent third stator winding modules; there is a gap between the two side surfaces of each short partition and the two stator winding modules adjacent to it; one end of each short partition extends to the first stator bracket and the second stator bracket, and the other end of each short partition extends to have a gap between the winding partition adjacent to it.

[0010] Furthermore, the first oil inlet, the outer peripheral walls of multiple stator winding modules, the outer peripheral walls of multiple winding partitions, the inner peripheral wall of the shell, the first diverter block, the second diverter block and the first oil outlet together form a first stator cooling channel; the second oil inlet, multiple stator winding modules, long partitions, multiple short partitions, multiple winding partitions, the first diverter block, the second diverter block, the first stator bracket, the second stator bracket and the second oil outlet together form a second stator cooling channel; the first stator cooling channel and the second stator cooling channel together form a stator cooling channel.

[0011] Further, the rotor assembly includes a first rotor, a second rotor, a first permanent magnet fixing plate, a second permanent magnet fixing plate and a plurality of permanent magnets; the first permanent magnet fixing plate is connected to the first rotor, the second permanent magnet fixing plate is connected to the second rotor, and the first rotor and the second rotor are connected; a plurality of permanent magnets arranged at intervals are installed on the first permanent magnet fixing plate; a plurality of permanent magnets arranged at intervals are installed on the second permanent magnet fixing plate; the bearing assembly includes a first bearing and a second bearing, the first rotor is installed on the housing through the first bearing, and the second rotor is installed on the housing through the second bearing.

[0012] Furthermore, the first rotor includes a first cylindrical section, a first disc section, and a second cylindrical section connected in sequence; the diameter of the first cylindrical section and the diameter of the second cylindrical section are both smaller than the diameter of the first disc section; the first cylindrical section and the first disc section are provided with a rotor oil inlet penetrating along their axial direction; the center of the first disc section is provided with a first connecting port connected to the rotor oil inlet; the end surface of the first disc section close to the second cylindrical section is provided with a plurality of first rotor oil outlets distributed at intervals in the circumferential direction around the first connecting port, and the plurality of first rotor oil outlets all extend in the radial direction of the first disc section and are all connected to the first connecting port; the first rotor also includes a third cylindrical section, which is located in the rotor oil inlet and the first connecting port and is connected to the second cylindrical section; the second cylindrical section and the third cylindrical section are provided with a second connecting port penetrating along their axial direction; the second The connecting port is connected with the oil inlet of the rotor; the first permanent magnet fixing plate is sleeved on the second cylindrical segment and fits with the first disc segment; the second rotor comprises a fourth cylindrical segment, a second disc segment and a fifth cylindrical segment connected in sequence; the diameter of the fourth cylindrical segment and the diameter of the fifth cylindrical segment are both smaller than the diameter of the second disc segment; the fourth cylindrical segment is provided with a third connecting port penetrating along its axial direction; the third connecting port is connected with the second connecting port; the end surface of the second disc segment close to the fourth cylindrical segment is provided with a fourth connecting port connected with the third connecting port, and the end surface of the second disc segment is also provided with a plurality of second rotor oil outlets arranged at intervals in the circumferential direction around the fourth connecting port, and the plurality of second rotor oil outlets all extend along the radial direction of the second disc segment and are all connected with the fourth connecting port; the second permanent magnet fixing plate is sleeved on the third cylindrical segment and fits with the second disc segment.

[0013] Further, the first permanent magnet fixing plate and the first rotor jointly form a first rotor cooling channel; the second permanent magnet fixing plate and the second rotor jointly form a second rotor cooling channel; the first rotor and the second rotor jointly form a rotor connecting cooling channel; the first rotor cooling channel, the rotor connecting cooling channel and the second rotor cooling channel are connected in sequence and jointly form a rotor cooling channel.

[0014] Furthermore, a first annular guide groove and a second annular guide groove are arranged at intervals on the inner circumferential wall of the shell, and the first annular guide groove is arranged opposite to the multiple first rotor oil outlets; the second annular guide groove is arranged opposite to the multiple second rotor oil outlets; the casing oil outlet includes a first casing oil outlet and a second casing oil outlet arranged at intervals, and the first casing oil outlet and the second casing oil outlet are opened on the outer circumferential wall of the shell, the first casing oil outlet is connected to the first annular guide groove, and the second casing oil outlet is connected to the second annular guide groove.

[0015] Furthermore, one of the second cylindrical segment and the fourth cylindrical segment has a protruding structure, and the other has a groove structure; the second cylindrical segment and the fourth cylindrical segment are butted against each other via the protruding structure and the groove structure.

[0016] Furthermore, the shell includes a casing, an end cover and casing fixing screws, and the casing and the end cover are detachably connected via the casing fixing screws.

[0017] By applying the technical solution of the present invention, the cooling structure of the axial flux permanent magnet motor is optimized, a cooling structure is provided to form a stator cooling channel and a rotor cooling channel, which can cool the stator winding module, the stator core module and the permanent magnet, and has a good cooling effect.

[0018] Based on the implementations provided in the above aspects, this application can also be further combined to provide more implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of an axial flux permanent magnet motor with a composite cooling structure provided by an optional embodiment of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the axial cross-section structure;

[0022] Figure 3 for Figure 1 A schematic diagram of a three-dimensional assembly structure of a casing and a stator assembly of an axial flux permanent magnet motor with a composite cooling structure after removing the end cover;

[0023] Figure 4 is a schematic diagram of a stator cooling channel of an optional embodiment of the present invention;

[0024] Figure 5 for Figure 4 A schematic diagram of the distribution structure of multiple winding partitions, multiple short partitions, a first shunt block, a long partition and a second shunt block of a stator assembly;

[0025] Figure 6 for Figure 1 A schematic diagram of the three-dimensional structure of the rotor assembly of the axial flux permanent magnet motor with a composite cooling structure;

[0026] Figure 7 for Figure 6 A schematic diagram of a rotor cooling channel formed by a rotor assembly in FIG.

[0027] Description of Figure Numbers:

[0028] 1. Casing; 2. Bearing assembly; 210. First bearing; 220. Second bearing; 3. First rotor; 301. First cylindrical section; 302. First disc section; 303. Second cylindrical section; 304. Third cylindrical section; 4. First permanent magnet fixing plate; 5. Permanent magnet; 6. Stator core module; 7. First stator bracket; 8. Stator winding module; 81. First stator winding module; 82. Second stator winding module; 83. Third stator winding module; 9. Second stator bracket; 10. Second rotor; 101. Fourth cylindrical section; 102. Second disc section; 103. Fifth cylindrical section; 11. Second permanent magnet fixing plate; 12. End cover; 13. Winding partition; 14. Short partition; 151. The first shunt block; 152, the second shunt block; 16, the stator oil outlet; 161, the first oil outlet; 162, the second oil outlet; 17, the stator oil inlet; 171, the first oil inlet; 172, the second oil inlet; 18, the long partition; 19, the first annular guide groove; 20, the casing oil outlet; 201, the first casing oil outlet; 202, the second casing oil outlet; 21, the casing fixing screw; 22, the rotor oil inlet; 231, the first rotor oil outlet; 232, the second rotor oil outlet; 233, the first connecting port; 234, the second connecting port; 235, the third connecting port; 236, the fourth connecting port; 24, the permanent magnet fixing screw; 25, the second annular guide groove; 26, the stator bracket fixing screw. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0030] like Figures 1 to 7 As shown, an embodiment of the present invention provides an axial flux permanent magnet motor with a composite cooling structure, comprising: a shell, the shell having a stator oil inlet 17, a stator oil outlet 16 and a casing oil outlet 20; a stator assembly, the stator assembly is installed in the shell, and the stator winding module 8 of the stator assembly is wound on the stator core module 6 of the stator assembly; the stator assembly and the shell together form a stator cooling channel, the stator cooling channel is connected to the stator oil inlet 17 and the stator oil outlet 16, and the stator cooling channel flows through the stator winding module 8; a rotor assembly and a bearing assembly 2, the rotor assembly is connected to the shell through the bearing assembly 2; the rotor assembly and the shell together form a rotor cooling channel, the rotor cooling channel is connected to the casing oil outlet 20, and the rotor cooling channel flows through the permanent magnet 5 of the rotor assembly.

[0031] In this way, the cooling oil in the stator cooling channel flows through the stator winding module 8, the heat of the stator core module 6 is transferred to the stator winding module 8, the cooling oil takes away the heat at the stator core module 6 and the stator winding module 8, and the cooling oil in the rotor cooling channel flows through the permanent magnet 5, taking away the heat of the permanent magnet 5, thereby producing a good cooling effect on the stator assembly and a good cooling result on the rotor assembly. The solution provided by the present invention can effectively take away the heat inside the motor, produce a good cooling effect, and is conducive to the development of high power density and high torque of the motor.

[0032] like Figures 3 to 5 As shown, the stator assembly includes a first stator bracket 7, a second stator bracket 9, a stator winding module 8 and a stator core module 6; a plurality of stator core modules 6 are arranged in the housing at intervals along the circumferential direction, a stator winding module 8 is correspondingly wound around the outer side of each stator core module 6, the first stator bracket 7 and the second stator bracket 9 are respectively arranged on both sides of the plurality of stator core modules 6 and the plurality of stator winding modules 8 along the axial direction; the first stator bracket 7 and the second stator bracket 9 are fixedly connected by stator bracket fixing screws 26. In this way, the stator core and the stator winding are modularly arranged, and the installation is convenient. The stator core module 6 is in close contact with the stator winding module 8, and heat can be transferred. The stator core module 6 can be taken away by the stator winding module 8.

[0033] like Figure 4 As shown, the stator oil inlet 17 and the stator oil outlet 16 are adjacently arranged on the side wall of the shell, the stator oil inlet 17 includes a first oil inlet 171 and a second oil inlet 172, and the stator oil outlet 16 includes a first oil outlet 161 and a second oil outlet 162; the plurality of stator winding modules 8 include a first stator winding module 81 close to the stator oil inlet 17, a second stator winding module 82 close to the stator oil outlet 16, and a plurality of third stator winding modules 83 located between the first stator winding module 81 and the second stator winding module 82; the stator assembly also includes a first stator winding module 81 installed in the first stator oil inlet 17, a second stator winding module 82 installed in the second stator oil outlet 16, and a plurality of third stator winding modules 83 located between the first stator winding module 81 and the second stator winding module 82. The winding partition 13, the short partition 14, the long partition 18, the first shunt block 151 and the second shunt block 152 between the sub-bracket 7 and the second stator bracket 9; wherein the first shunt block 151 is arranged between the first stator winding module 81 and the shell, and the first shunt block 151 is located between the first oil inlet 171 and the second oil inlet 172; the second shunt block 152 is arranged between the second stator winding module 82 and the shell, and the second shunt block 152 is located between the first oil outlet 161 and the second oil outlet 162; the first stator winding module 81 and the second stator winding module 82 are arranged between the first stator winding module 81 and the second stator winding module 82. A long partition 18 is arranged between the first stator bracket 7 and the second stator bracket 9, one end of the long partition 18 extends to the first stator bracket 7 and the second stator bracket 9, and the other end of the long partition 18 extends to the shell; a winding partition 13 is connected between the side rear end of the first stator winding module 81 and the side rear end of the third stator winding module 83 adjacent thereto, a winding partition 13 is connected between the side rear end of the second stator winding module 82 and the side rear end of the third stator winding module 83 adjacent thereto, and a winding partition 13 is connected between the side rear ends of each of the two adjacent third stator winding modules 83; the first stator winding module A short partition 14 is provided between the first stator winding module 81 and the third stator winding module 83 adjacent thereto; a short partition 14 is provided between the second stator winding module 82 and the third stator winding module 83 adjacent thereto; a short partition 14 is provided between each of the two adjacent third stator winding modules 83; there is a gap between the two sides of each short partition 14 and the two stator winding modules 8 adjacent thereto; one end of each short partition 14 extends to the first stator bracket 7 and the second stator bracket 9, and the other end of each short partition 14 extends to a gap between the winding partition 13 adjacent thereto. In this way, the structure of the stator assembly is optimized, and the stator cooling structure is added. By providing a plurality of winding partitions 13, a plurality of short partitions 14, a long partition 18, a first shunt block 151 and a second shunt block 152, and cooperating with the shell, a stator cooling channel is formed, and the stator cooling channel can flow through a plurality of stator winding modules 8 to take away the heat of the stator winding modules 8 and the stator core module 6.

[0034] like Figure 4As shown, the first oil inlet 171, the outer peripheral walls of multiple stator winding modules 8, the outer peripheral walls of multiple winding partitions 13, the inner peripheral wall of the shell, the first shunt block 151, the second shunt block 152 and the first oil outlet 161 together form the first stator cooling channel; the second oil inlet 172, multiple stator winding modules 8, the long partition 18, multiple short partitions 14, multiple winding partitions 13, the first shunt block 151, the second shunt block 152, the first stator bracket 7, the second stator bracket 9 and the second oil outlet 162 together form the second stator cooling channel; the first stator cooling channel and the second stator cooling channel together form the stator cooling channel. In this way, the first stator cooling channel and the second cooling channel have a larger contact area with the multiple stator winding modules 8, and the cooling effect is better and the cooling efficiency is higher.

[0035] like Figure 6 and Figure 7 As shown, the rotor assembly includes a first rotor 3, a second rotor 10, a first permanent magnet fixing plate 4, a second permanent magnet fixing plate 11 and a plurality of permanent magnets 5; the first permanent magnet fixing plate 4 is connected to the first rotor 3, the second permanent magnet fixing plate 11 is connected to the second rotor 10, and the first rotor 3 is connected to the second rotor 10; a plurality of permanent magnets 5 arranged at intervals are installed on the first permanent magnet fixing plate 4; a plurality of permanent magnets 5 arranged at intervals are installed on the second permanent magnet fixing plate 11; the bearing assembly 2 includes a first bearing 210 and a second bearing 220, the first rotor 3 is installed on the housing through the first bearing 210, and the second rotor 10 is installed on the housing through the second bearing 220. In this way, the first rotor 3 and the second rotor 10 are rotatably installed on the housing through the first bearing 210 and the second bearing 220, and rotate synchronously, and the assembly is simple.

[0036] like Figure 7As shown, the first rotor 3 includes a first cylindrical section 301, a first disc section 302 and a second cylindrical section 303 connected in sequence; the diameter of the first cylindrical section 301 and the diameter of the second cylindrical section 303 are both smaller than the diameter of the first disc section 302; the first cylindrical section 301 and the first disc section 302 are provided with a rotor oil inlet 22 penetrating along the axial direction thereof; the center of the first disc section 302 is provided with a first connecting port 233 connected to the rotor oil inlet 22; the end surface of the first disc section 302 close to the second cylindrical section 303 is provided with a plurality of connecting ports 233 around the first connecting port 233; The first rotor oil outlet 231 and the second rotor oil outlet 232 are circumferentially spaced and distributed, and the plurality of first rotor oil outlets 231 and the second rotor oil outlets 232 all extend along the radial direction of the first disc segment 302 and are all connected to the first connecting port 233; the first rotor 3 also includes a third cylindrical segment 304, which is located inside the rotor oil inlet 22 and the first connecting port 233 and connected to the second cylindrical segment 303; the second cylindrical segment 303 and the third cylindrical segment 304 are provided with a second connecting port 234 penetrating along the axial direction thereof; the second connecting port 233 is connected to the second cylindrical segment 303 and the third cylindrical segment 304; 34 is connected to the rotor oil inlet 22; the first permanent magnet fixing plate 4 is sleeved on the second cylindrical segment 303 and fits with the first disc segment 302; the second rotor 10 includes a fourth cylindrical segment 101, a second disc segment 102 and a fifth cylindrical segment 103 connected in sequence; the diameter of the fourth cylindrical segment 101 and the diameter of the fifth cylindrical segment 103 are both smaller than the diameter of the second disc segment 102; the fourth cylindrical segment 101 is provided with a third communication port 235 penetrating along the axial direction thereof; the third communication port 235 is connected to the second communication port 234; the second disc segment 102 is close to the A fourth connecting port 236 connected to the third connecting port 235 is provided on the end surface of the fourth cylindrical segment 101, and a plurality of second first rotor oil outlets 231 and second rotor oil outlets 232 are arranged circumferentially around the fourth connecting port 236 on the end surface of the second disc segment 102. The plurality of second first rotor oil outlets 231 and second rotor oil outlets 232 extend radially along the second disc segment 102 and are connected to the fourth connecting port 236. The second permanent magnet fixing plate 11 is sleeved on the third cylindrical segment 304 and fits the second disc segment 102. In this way, the structure of the rotor assembly is optimized, and the rotor oil inlet 22, the first connecting port 233, the first rotor oil outlet 231, the second connecting port 234, the third connecting port 235, the fourth connecting port 236, and the second rotor oil outlet 232 are used to form a rotor cooling channel, and the rotor cooling channel flows through the permanent magnet 5 to take away the heat of the permanent magnet 5.

[0037] During use, after the cooling oil enters the rotor oil inlet 22, a part of the cooling oil enters the second connecting port 234, and then enters the second rotor oil outlet 232 through the third connecting port 235 and the fourth connecting port 236, thereby cooling the permanent magnet 5 corresponding to the second rotor 10; the other part of the cooling oil enters the first connecting port 233, and then enters the first rotor oil outlet 231, thereby cooling the permanent magnet 5 corresponding to the first rotor 3.

[0038] like Figure 7 As shown, the first permanent magnet fixing plate 4 and the first rotor 3 together form the first rotor cooling channel; the second permanent magnet fixing plate 11 and the second rotor 10 together form the second rotor cooling channel; the first rotor 3 and the second rotor 10 together form a rotor connecting cooling channel, and the connecting cooling channel connects the first rotor cooling channel and the second rotor cooling channel; the first rotor cooling channel, the rotor connecting cooling channel and the second rotor cooling channel are connected in sequence and together form the rotor cooling channel. In this way, the first rotor cooling channel and the second rotor cooling channel flow through the multiple permanent magnets 5 corresponding to the first rotor 3 and the multiple permanent magnets 5 corresponding to the second rotor 10 respectively, and the cooling effect is better and the cooling efficiency is higher.

[0039] like Figure 2 As shown, the inner peripheral wall of the housing is provided with a first annular guide groove 19 and a second annular guide groove 25 at intervals, the first annular guide groove 19 is arranged opposite to a plurality of first rotor oil outlets 231 and a second rotor oil outlet 232; the second annular guide groove 25 is arranged opposite to a plurality of second first rotor oil outlets 231 and a second rotor oil outlet 232; the housing oil outlet 20 includes a first housing oil outlet 201 and a second housing oil outlet 202 arranged at intervals, and the outer peripheral wall of the housing is provided with a first housing oil outlet 201 and a second housing oil outlet 202, the first housing oil outlet 201 is connected to the first annular guide groove 19, and the second housing oil outlet 202 is connected to the second annular guide groove 25. In this way, the cooling oil is thrown out from the first rotor cooling channel and the second rotor cooling channel into the first annular guide groove 19 and the second annular guide groove 25 as the rotor assembly rotates, and then flows out from the first housing oil outlet 201 and the second housing oil outlet 202 to the outside of the motor.

[0040] like Figure 7 As shown, one of the second cylindrical segment 303 and the fourth cylindrical segment 101 has a protruding structure, and the other has a groove structure; the second cylindrical segment 303 and the fourth cylindrical segment 101 are butted together through the protruding structure and the groove structure. In this way, the butt assembly between the first rotor 3 and the second rotor 10 is facilitated.

[0041] Optionally, threads are provided at the connection between the first rotor 3 and the second rotor 10. During assembly, high temperature resistant anti-loosening thread glue is applied to the threads, and the two are screwed in and fastened to each other, so that they can rotate synchronously.

[0042] like Figure 1 As shown, the housing comprises a casing 1, an end cover 12 and casing fixing screws 21, and the casing 1 and the end cover 12 are detachably connected via the casing fixing screws 21. In this way, it is convenient to assemble the rotor assembly and the stator assembly in the housing.

[0043] In a specific embodiment of the present invention, an axial flux permanent magnet motor with a specific stator-rotor composite cooling structure is provided, comprising a motor body structure, a stator cooling structure and a rotor cooling structure, wherein the motor body structure comprises a casing, a bearing, an end cover, fixing screws, etc., the stator cooling structure comprises a stator core module, a stator winding module, a stator bracket, a long partition, a short partition, a shunt block, etc., and the rotor cooling structure comprises a rotor, a permanent magnet, a permanent magnet fixing plate, etc. The casing is provided with a stator oil inlet, a stator oil outlet, a casing oil outlet, a first guide groove and a second guide groove provided on the casing, the stator core module and the stator winding module are provided inside the casing through the stator bracket, and the stator cooling structure is composed of a stator fixing plate, a long partition, a short partition, and a shunt block, the casing is provided with a stator oil inlet, a stator oil outlet and a casing oil outlet, the stator cooling structure is connected to the casing, and the stator cooling structure can cool the stator core module and the stator winding module located inside the casing. The rotor cooling structure is composed of a rotor, a permanent magnet and a permanent magnet fixing plate. The cooling oil flows in from the rotor and can directly contact the permanent magnet. When the rotor rotates, the cooling oil is thrown onto the inner wall of the casing and guided by the guide grooves provided on the inner wall of the casing to flow out from the casing oil outlet provided on the casing. The cooling oil flowing through the stator cooling structure is in direct contact with the stator core module and the stator winding module, and the cooling oil flowing through the rotor cooling structure is in direct contact with the permanent magnet, which can solve the problem that the existing motor cooling structure is difficult to produce a good cooling effect and hinders the development of the motor to high power density and high torque density.

[0044] In a specific embodiment of the present invention, an axial flux permanent magnet motor with a specific stator-rotor composite cooling structure is provided, comprising a motor body structure, a stator cooling structure and a rotor cooling structure.

[0045] The motor body structure includes a casing 1, a bearing assembly 2, an end cover 12, a casing fixing screw 21, etc. The casing 1 is provided with a stator oil inlet 17, a stator oil outlet 16, a first annular guide groove 19, a second annular guide groove 25, and a casing oil outlet 20. The stator cooling structure includes a casing 1, a first stator bracket 7, a second stator bracket 9, a winding partition 13, a short partition 14, a first shunt block 151, a second shunt block 152, a long partition 18, a stator core module 6, a stator winding module 8, a stator oil inlet 17, and a stator oil outlet 16; the stator winding module 8 is wound on the stator core module 6, and the first stator bracket 7 and the second stator bracket 9 are axially arranged on both sides of the stator core module 6 and the stator winding module 8, and are axially fastened by the stator bracket fixing screws 26. The winding partition 13 , the short partition 14 , the first shunt block 151 , the second shunt block 152 , and the long partition 18 are arranged on the first stator bracket 7 and the second stator bracket 9 and together with the inner wall surface of the casing 1 form a stator cooling structure.

[0046] The stator oil inlet 17 and the stator oil outlet 16 are provided on the casing 1. The winding partition 13, the long partition 18, the short partition 14, the first shunt block 151, the second shunt block 152, the stator core module 6, and the stator winding module 8 are fastened axially by the first stator bracket 7 and the second stator bracket 9 by the stator bracket fixing screws 26 and then pressed into the casing 1 to form a stator cooling outer flow channel and a stator cooling inner flow channel.

[0047] The first stator bracket 7, the second stator bracket 9, the winding partition 13, the first shunt block 151, the second shunt block 152, the stator core module 6, and the stator winding module 8 are composed. The outer flow channel is connected with the stator oil inlet 17 and the stator oil outlet 16, and the stator oil inlet 17 and the stator oil outlet 16 are both connected with the external oil circuit.

[0048] It consists of a first stator bracket 7, a second stator bracket 9, a winding partition 13, a long partition 18, a short partition 14, a first shunt block 151, a second shunt block 152, a stator core module 6, and a stator winding module 8. The inner flow channel is connected to the stator oil inlet 17 and the stator oil outlet 16, and the stator oil inlet 17 and the stator oil outlet 16 are both connected to the external oil circuit.

[0049] The machine body is composed of a housing 1, a first rotor 3, a second rotor 10, a first permanent magnet fixing plate 4, a second permanent magnet fixing plate 11, and a permanent magnet 5. The first rotor 3 is axially connected to the second rotor 10. There are multiple permanent magnets 5 on the surfaces of the first rotor 3 and the second rotor 10. The permanent magnets 5 are fixed to the first rotor 3 and the second rotor 10 through the first permanent magnet fixing plate 4 and the second permanent magnet fixing plate 11. Multiple cooling channels are radially arranged on the first rotor 3 and the second rotor 10. The first rotor oil outlet 23 is at the end of the channel. The first rotor oil outlet 1 and the second rotor oil outlet 232 are arranged at the outer diameter of the rotor, the rotor oil inlet 22 is connected with the external oil circuit, the first annular guide groove 19 and the second annular guide groove 25 arranged on the casing 1 are connected with the casing oil outlet 20, and the oil thrown out due to the centrifugal force when the first rotor oil outlet 231 and the second rotor oil outlet 232 rotate is guided by the first annular guide groove 19 and the second annular guide groove 25, and flows to the external oil circuit through the casing oil outlet 20.

[0050] The present invention provides a stator-rotor composite cooling structure for an axial flux permanent magnet motor, which can solve the problem that the existing motor cooling structure is difficult to directly dissipate the heat of the motor.

[0051] The present invention provides a stator cooling structure and a rotor cooling structure so that the cooling oil directly contacts the internal heat source of the motor, thereby achieving a better heat exchange effect and being beneficial to improving the heat dissipation effect of the motor.

[0052] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, an axial flux permanent magnet motor with a stator-rotor composite cooling structure includes a motor body structure, a stator cooling structure and a rotor cooling structure. The motor body structure includes a housing 1, a bearing assembly 2, an end cover 12, a housing fixing screw 21, etc., which mainly plays a supporting role, such as Figure 1 shown.

[0053] The stator cooling structure includes a stator core module 6, a stator winding module 8, a first stator bracket 7 and a second stator bracket 9, a long partition 18, a short partition 14, a first shunt block 151 and a second shunt block 152, etc. Figure 3 The rotor cooling structure includes a housing 1, a first rotor 3, a second rotor 10, a first permanent magnet fixing plate 4, and a permanent magnet 5. Figure 5As shown. The stator cooling structure is connected to the housing 1, and the housing 1 is also one of the components of the stator cooling structure. The stator cooling channel is arranged inside the stator cooling structure. The stator core module 6 is in close contact with the stator winding module 8. The stator core module 6 will transfer heat with the stator winding module 8, and the setting of the inner and outer flow channels can enable the cooling oil body to fully contact the stator winding module 8. Finally, the heat generated by the two is taken away by the cooling oil flowing in the inner and outer flow channels of the stator cooling structure, which can produce a good cooling effect on the stator core module 6 and the stator winding module 8. The rotor cooling structure is connected to the housing 1 and the end cover 12 through the bearing assembly 2. There are multiple permanent magnets 5 on the surface of the first rotor and the second rotor. The heat generated by the permanent magnets 5 is taken away by the cooling oil flowing through the rotor, which can produce a good cooling effect on the rotor.

[0054] Specifically, the stator cooling structure is as follows: Figure 3 As shown, the first stator bracket 7 and the second stator bracket 9 are arranged on both sides of the stator core module 6 and the stator winding module 8, and are in contact with the housing 1 in the main structure. The first stator bracket 7 and the second stator bracket 9 and the housing 1 are all made of high-strength aluminum alloy, so that their influence on the electromagnetic performance of the motor can be ignored. The stator oil inlet 17 and the stator oil outlet 16 are both arranged on the housing 1, so that the cooling oil flowing through the stator cooling structure is connected to the outside.

[0055] Specifically, refer to Figure 6 As shown, the rotor cooling structure includes a casing 1, a first rotor 3, a second rotor 10, a first permanent magnet fixing plate 4, and a permanent magnet 5. The first rotor 3 and the second rotor 10 are axially connected. There are multiple permanent magnets on the surfaces of the first rotor 3 and the second rotor 10. The permanent magnet 5 is fixed to the first rotor 3 by the first permanent magnet fixing plate 4 and the permanent magnet fixing screws 24. The bottom of the permanent magnet 5 is in direct contact with the cooling oil flowing through the cooling channel arranged on the rotor, which can have a good cooling effect on the rotor.

[0056] Specifically, a rotor oil inlet 22 is provided on the rotor, and cooling oil flows in from the rotor oil inlet 22. When the motor is working, the rotor rotates to throw the cooling oil out from the first rotor oil outlet 231 and the second rotor oil outlet 232, and the casing 1 is provided with a first annular guide groove 19, a second annular guide groove 25 and a casing oil outlet 20, which can guide the cooling oil flowing out of the rotor to the external oil circuit.

[0057] The present invention adopts a solution of making the cooling oil directly contact with the heat source of the motor, which greatly improves the cooling efficiency of the motor and provides a solution for further improving the cooling performance of the axial permanent magnet motor.

[0058] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0060] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Claims

1. An axial flux permanent magnet motor with a composite cooling structure, characterized in that: include: A housing, the housing having a stator oil inlet (17), a stator oil outlet (16) and a casing oil outlet (20); A stator assembly, the stator assembly being mounted in the housing, the stator winding module (8) of the stator assembly being wound on the stator core module (6) of the stator assembly; the stator assembly and the housing together forming a stator cooling channel, the stator cooling channel being in communication with the stator oil inlet (17) and the stator oil outlet (16), the stator cooling channel flowing through the stator winding module (8); A rotor assembly and a bearing assembly (2), wherein the rotor assembly is connected to the housing via the bearing assembly (2); the rotor assembly and the housing together form a rotor cooling channel, wherein the rotor cooling channel is in communication with the housing oil outlet (20), and wherein the rotor cooling channel flows through the permanent magnet (5) of the rotor assembly.

2. The axial flux permanent magnet motor with a composite cooling structure according to claim 1, characterized in that: The stator assembly comprises a first stator bracket (7), a second stator bracket (9), a stator winding module (8) and a stator core module (6); a plurality of the stator core modules (6) are arranged in the housing at intervals along the circumferential direction, a stator winding module (8) is correspondingly wound around the outer side of each stator core module (6), and the first stator bracket (7) and the second stator bracket (9) are respectively arranged on both sides of the plurality of stator core modules (6) and the plurality of stator winding modules (8) along the axial direction; The first stator bracket (7) and the second stator bracket (9) are fixedly connected via stator bracket fixing screws (26).

3. The axial flux permanent magnet motor with a composite cooling structure according to claim 2, characterized in that: The stator oil inlet (17) and the stator oil outlet (16) are adjacently arranged on the side wall of the housing, the stator oil inlet (17) comprises a first oil inlet (171) and a second oil inlet (172), and the stator oil outlet (16) comprises a first oil outlet (161) and a second oil outlet (162); The plurality of stator winding modules (8) include a first stator winding module (81) close to the stator oil inlet (17), a second stator winding module (82) close to the stator oil outlet (16), and a plurality of third stator winding modules (83) located between the first stator winding module (81) and the second stator winding module (82); The stator assembly further comprises a winding partition (13), a short partition (14), a long partition (18), a first shunt block (151) and a second shunt block (152) installed between the first stator bracket (7) and the second stator bracket (9); Wherein, the first shunt block (151) is arranged between the first stator winding module (81) and the housing, and the first shunt block (151) is located between the first oil inlet (171) and the second oil inlet (172); the second shunt block (152) is arranged between the second stator winding module (82) and the housing, and the second shunt block (152) is located between the first oil outlet (161) and the second oil outlet (162); The long partition (18) is provided between the first stator winding module (81) and the second stator winding module (82), one end of the long partition (18) extends to the first stator bracket (7) and the second stator bracket (9), and the other end of the long partition (18) extends to the housing; A winding partition plate (13) is connected between the rear end of the first stator winding module (81) and the rear end of the third stator winding module (83) adjacent thereto, a winding partition plate (13) is connected between the rear end of the second stator winding module (82) and the rear end of the third stator winding module (83) adjacent thereto, and a winding partition plate (13) is connected between the rear ends of each two adjacent third stator winding modules (83); A short partition (14) is provided between the first stator winding module (81) and the third stator winding module (83) adjacent thereto; a short partition (14) is provided between the second stator winding module (82) and the third stator winding module (83) adjacent thereto; and a short partition (14) is provided between each two adjacent third stator winding modules (83); There is a gap between the two side faces of each short partition (14) and the two stator winding modules (8) adjacent thereto; one end of each short partition (14) extends to the first stator bracket (7) and the second stator bracket (9), and the other end of each short partition (14) extends to have a gap between it and the winding partition (13) adjacent thereto.

4. The axial flux permanent magnet motor with a composite cooling structure according to claim 3, characterized in that: The first oil inlet (171), the outer peripheral walls of the plurality of stator winding modules (8), the outer peripheral walls of the plurality of winding partitions (13), the inner peripheral wall of the housing, the first flow divider block (151), the second flow divider block (152) and the first oil outlet (161) together form a first stator cooling channel; The second oil inlet (172), the plurality of stator winding modules (8), the long partition (18), the plurality of short partitions (14), the plurality of winding partitions (13), the first shunt block (151), the second shunt block (152), the first stator bracket (7), the second stator bracket (9) and the second oil outlet (162) together form a second stator cooling channel; The first stator cooling channel and the second stator cooling channel together form a stator cooling channel.

5. The axial flux permanent magnet motor with a composite cooling structure according to any one of claims 1 to 4, characterized in that: The rotor assembly comprises a first rotor (3), a second rotor (10), a first permanent magnet fixing plate (4), a second permanent magnet fixing plate (11) and a plurality of permanent magnets (5); the first permanent magnet fixing plate (4) is connected to the first rotor (3), the second permanent magnet fixing plate (11) is connected to the second rotor (10), and the first rotor (3) and the second rotor (10) are connected; the first permanent magnet fixing plate (4) is provided with a plurality of permanent magnets (5) arranged at intervals; the second permanent magnet fixing plate (11) is provided with a plurality of permanent magnets (5) arranged at intervals; The bearing assembly (2) comprises a first bearing (210) and a second bearing (220); the first rotor (3) is mounted on the housing via the first bearing (210); and the second rotor (10) is mounted on the housing via the second bearing (220).

6. The axial flux permanent magnet motor with a composite cooling structure according to claim 5, characterized in that: The first rotor (3) comprises a first cylindrical segment (301), a first disc segment (302) and a second cylindrical segment (303) which are connected in sequence; the diameter of the first cylindrical segment (301) and the diameter of the second cylindrical segment (303) are both smaller than the diameter of the first disc segment (302); The first cylindrical section (301) and the first disc section (302) are provided with a rotor oil inlet (22) penetrating along the axial direction thereof; a first communication port (233) communicating with the rotor oil inlet (22) is provided at the center of the first disc section (302); a plurality of first rotor oil outlets (231) are provided at intervals in the circumferential direction around the first communication port (233) on the end surface of the first disc section (302) close to the second cylindrical section (303); the plurality of first rotor oil outlets (231) all extend along the radial direction of the first disc section (302) and all communicate with the first communication port (233); The first rotor (3) further comprises a third cylindrical section (304), wherein the third cylindrical section (304) is located within the rotor oil inlet (22) and the first communication port (233) and is connected to the second cylindrical section (303); The second cylindrical section (303) and the third cylindrical section (304) are provided with a second communication port (234) penetrating along their axial direction; the second communication port (234) is communicated with the rotor oil inlet (22); The first permanent magnet fixing plate (4) is sleeved on the second cylindrical segment (303) and fits closely with the first disc segment (302); The second rotor (10) comprises a fourth cylindrical segment (101), a second disc segment (102) and a fifth cylindrical segment (103) which are connected in sequence; the diameter of the fourth cylindrical segment (101) and the diameter of the fifth cylindrical segment (103) are both smaller than the diameter of the second disc segment (102); The fourth cylindrical section (101) is provided with a third communication port (235) penetrating along its axial direction; the third communication port (235) is communicated with the second communication port (234); A fourth communication port (236) communicating with the third communication port (235) is provided on the end surface of the second disc segment (102) close to the fourth cylindrical segment (101); a plurality of second rotor oil outlets (232) are also provided on the end surface of the second disc segment (102) and are arranged at intervals in the circumferential direction around the fourth communication port (236); the plurality of second rotor oil outlets (232) all extend in the radial direction of the second disc segment (102) and all communicate with the fourth communication port (236); The second permanent magnet fixing plate (11) is sleeved on the third cylindrical segment (304) and fits closely with the second disc segment (102).

7. The axial flux permanent magnet motor with a composite cooling structure according to claim 6, characterized in that: The first permanent magnet fixing plate (4) and the first rotor (3) together form a first rotor cooling channel; the second permanent magnet fixing plate (11) and the second rotor (10) together form a second rotor cooling channel; the first rotor (3) and the second rotor (10) together form a rotor connecting cooling channel; the first rotor cooling channel, the rotor connecting cooling channel and the second rotor cooling channel are connected in sequence and together form a rotor cooling channel.

8. The axial flux permanent magnet motor with a composite cooling structure according to claim 6, characterized in that: A first annular guide groove (19) and a second annular guide groove (25) are arranged at intervals on the inner peripheral wall of the housing; the first annular guide groove (19) is arranged opposite to the plurality of first rotor oil outlets (231); and the second annular guide groove (25) is arranged opposite to the plurality of second rotor oil outlets (232); The casing oil outlet (20) comprises a first casing oil outlet (201) and a second casing oil outlet (202) which are arranged at intervals. The first casing oil outlet (201) and the second casing oil outlet (202) are provided on the outer peripheral wall of the shell. The first casing oil outlet (201) is communicated with the first annular guide groove (19), and the second casing oil outlet (202) is communicated with the second annular guide groove (25).

9. The axial flux permanent magnet motor with a composite cooling structure according to claim 6, characterized in that: One of the second cylindrical segment (303) and the fourth cylindrical segment (101) has a protruding structure, and the other has a groove structure; the second cylindrical segment (303) and the fourth cylindrical segment (101) are butted against each other via the protruding structure and the groove structure.

10. The axial flux permanent magnet motor with a composite cooling structure according to claim 1, characterized in that: The housing comprises a casing (1), an end cover (12) and casing fixing screws (21); the casing (1) and the end cover (12) are detachably connected via the casing fixing screws (21).

Images