Motor

Abstract

The invention relates to a motor, which comprises a shell, a stator, a rotor, a first cooling system and a second cooling system, the first cooling system is arranged on the shell and is configured to provide a channel for a first cooling medium to flow; the second cooling system comprises a heat exchange pipe and a second cooling channel; the heat exchange pipe is located in the first cooling system, one end is a second cooling medium inlet, and the other end communicates with one end of the second cooling channel. The second cooling channel comprises a fourth flow channel arranged on the stator; and one end of the fourth flow channel is communicated with the heat exchange tube, and the other end is a second spraying outlet for spraying and cooling a stator winding of the stator. The structure is simple, cooling is sufficient, and the effect of improving the winding current density and power density of the motor is obvious; the heat conduction and heat dissipation efficiency is high, so that the overall miniaturization and light weight effects of the motor are remarkable; and the stator is cooled based on the fourth flow channel, so that the cooling effect is improved, and the overload capacity of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a motor. Background Art

[0002] As the core component of new energy vehicles, the miniaturization and high power density of the motor have become the focus of its research. With the gradual increase in the requirements for winding current density and overall power density, the motor structure has become more compact, resulting in a rapid increase in the motor winding temperature and operating temperature. Therefore, it has become an issue that cannot be ignored to effectively dissipate heat and cool the permanent magnet synchronous motor and control the temperature of each motor component within a safe range. The end windings of the current stator oil-immersed cooling motor are often cooled by completely immersing it in oil or by adding an oil spray ring on the top. When fully immersed, the cooling oil flows slowly in the cavity, the convective heat transfer at the fluid-solid interface is poor, and the end windings are actually not fully cooled; when only the oil is sprayed on the top, the cooling medium can only contact the outer surface of the end winding, and the inner side and center part of the windings with worse heat dissipation are difficult to cool. The above problems need to be solved urgently. Summary of the invention

[0003] The invention discloses a motor, aiming to solve the technical problems existing in the prior art.

[0004] The present invention adopts the following technical solutions:

[0005] The present invention provides a motor, which includes a shell, a stator, a rotor, a first cooling system and a second cooling system; the first cooling system is arranged in the shell and is configured to provide a channel for the flow of a first cooling medium; the second cooling system includes a heat exchange tube and a second cooling channel; the heat exchange tube is located in the first cooling system, and one end of the heat exchange tube is a second cooling medium inlet, and the other end is connected to one end of the second cooling channel; the second cooling channel includes a fourth flow channel arranged in the stator; one end of the fourth flow channel is connected to the heat exchange tube, and the other end is a second spray outlet for spray cooling the stator winding of the stator.

[0006] In the motor of the present invention, the shell includes an outer shell, a first end cover and a second end cover; the first cooling system includes a plurality of first flow channels arranged in the outer shell wall of the shell, a first connecting groove arranged on the surface of the first end cover facing the shell side, and a second connecting groove arranged on the surface of the second end cover facing the shell side; the plurality of first flow channels are connected in series through the first connecting groove and the second connecting groove.

[0007] In the motor of the present invention, the first cooling system also includes a first inlet and a first outlet; the first inlet is arranged in the shell and is connected to one of the adjacent first flow channels; the first outlet is arranged in the shell and is connected to the other of the adjacent first flow channels; one end of the first flow channel where the first inlet and the first outlet are arranged is closed.

[0008] In the motor of the present invention, the second cooling channel also includes a second flow channel arranged in the outer shell wall of the shell, a third flow channel arranged on the rotating shaft of the rotor and a first discharge piece arranged on the outer side of the shell; one end of the second flow channel is connected to the heat exchange tube, and the other end is connected to one end of the third flow channel; the other end of the third flow channel forms a first spray outlet for spraying and cooling the stator and / or the rotor; the first spray outlet is connected to the inner cavity of the shell; the first discharge piece is connected to the inner cavity of the shell, and is used to discharge the cooling medium in the inner cavity of the shell.

[0009] In the motor of the present invention, the first spray outlet includes a bearing spray outlet, a winding spray outlet and an iron core spray outlet; the bearing spray outlet faces the bearing of the rotor and is arranged at an angle to the axial direction of the bearing.

[0010] In the motor of the present invention, the rotor core of the rotor is provided with a hollow structure penetrating through both ends along the axial direction and a connecting hole connecting the core spray port and the hollow structure.

[0011] In the motor of the present invention, the first discharge member is a trough structure, which is sealed and connected to the outer surface of the shell to form a buffer space; the buffer space is connected to the inner cavity of the shell and has a second outlet for discharging the cooling medium of the buffer space.

[0012] In the motor of the present invention, the fourth flow channel includes an annular third connecting groove and a plurality of fourth connecting grooves arranged on the outer peripheral surface of the stator core of the stator; the third connecting groove is connected to the heat exchange tube; one end of each of the fourth connecting grooves passes through the third connecting groove, and the other end passes through the end surface of the stator core to form the second spray outlet; the second flow channel is connected to the third connecting groove.

[0013] In the motor of the present invention, the second flow channel includes a first section, a second section and a third section arranged in the outer shell wall and the first end cover or the second end cover of the shell; one end of the first section is connected to the inner surface of the outer shell, and the other end is connected between the two ends of the second section; one end of the second section is closed, and the other end is connected to the end surface of the outer shell to be connected with one end of the third section; the other end of the third section is connected to the third flow channel.

[0014] In the motor of the present invention, a side of the third section connected to the third flow channel is a conical expansion structure.

[0015] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0016] The present invention mainly provides a motor, which cools down the motor housing and stator based on a first cooling system and a second cooling system respectively. The motor has a simple configuration and sufficient cooling, and is significantly effective in improving the winding current density and power density of the motor. The first cooling system is arranged in a housing structure and exchanges heat with the heat exchange pipe of the second cooling system, thereby improving the efficiency of heat conduction and heat dissipation, and significantly reducing the size and weight of the motor as a whole. The fourth flow channel is used to cool down the stator, thereby improving the cooling effect and enhancing the overload capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of a motor of the present invention;

[0019] Figure 2 It is one of the structural schematic diagrams of the housing of the present invention;

[0020] Figure 3 This is one of the cross-sectional structural schematic diagrams of a motor of the present invention;

[0021] Figure 4 The second structural schematic diagram of the housing provided with the first flow channel of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the first connecting groove of the present invention;

[0023] Figure 6 is a schematic structural diagram of the second connecting groove of the present invention;

[0024] Figure 7 is a schematic structural diagram of a second end cover of the present invention;

[0025] Figure 8 It is a schematic structural diagram of a rotor provided with a first spray outlet according to the present invention;

[0026] Fig. 9 It is a structural schematic diagram of a rotating shaft provided with a first spray outlet according to the present invention;

[0027] Fig.10 This is one of the cross-sectional structural schematic diagrams of the rotating shaft provided with the first spray outlet of the present invention;

[0028] Fig.11 The second schematic cross-sectional structure diagram of the rotating shaft provided with the first spray outlet of the present invention;

[0029] Fig.12 The second schematic cross-sectional structure diagram of a motor of the present invention;

[0030] Fig.13 It is a schematic diagram of the structure of the heat exchange tube of the invention.

[0031] Description of reference numerals:

[0032] 100. Shell; 101. Shell; 102. First end cover; 103. Second end cover; 200. Stator; 201. Stator winding; 202. Stator core; 300. Rotor; 301. Rotating shaft; 302. Bearing; 303. Rotor core; 304. Hollow structure; 305. First connecting hole; 400. First cooling system; 401. First flow channel; 402. First connecting groove; 403. Second connecting groove; 404. First inlet; 405. First outlet; 500. Second cooling system; 501. Heat exchange tube; 502. Second cooling channel; 5 021. Second flow channel; 50211. First section; 50212. Second section; 50213. Third section; 5022. Third flow channel; 5023. First discharge piece; 5024. First spray outlet; 50241. Bearing spray outlet; 50242. Winding spray outlet; 50243. Core spray outlet; 5025. Fourth flow channel; 50251. Third connecting groove; 50252. Fourth connecting groove; 50253. Second connecting hole; 5026. Second spray outlet; 5207. Buffer space; 5208. Second outlet; 5029. Second inlet. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically limited.

[0035] Obviously, the described embodiments are only some embodiments 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 are within the scope of protection of the present invention.

[0036] In order to solve the problems existing in the prior art, an embodiment of the present application provides a motor.

[0037] like Figure 1-Figure 3 and Figure 7 As shown, a motor includes a housing 100, a stator 200, a rotor 300, a first cooling system 400 and a second cooling system 500; the first cooling system 400 is arranged in the housing 100 and is configured to provide a channel for the flow of a first cooling medium; the second cooling system 500 includes a heat exchange pipe 501 and a second cooling channel 502; the heat exchange pipe 501 is located in the first cooling system 400, and one end is a second cooling medium inlet, and the other end is connected to one end of the second cooling channel 502; the second cooling channel 502 includes a fourth flow channel 5025 arranged in the stator 200; one end of the fourth flow channel 5025 is connected to the heat exchange pipe 501, and the other end is a second spray outlet 5026 for spray cooling the stator winding 201 of the stator 200. Specifically, the media flowing in the first cooling system 400 and the second cooling system 500 can be the same or different. Preferably, the medium in the first cooling system 400 is water, and the medium in the second cooling system 500 is oil.

[0038] A motor of the present invention cools down the motor housing and the stator based on a first cooling system 400 and a second cooling system 500 respectively. The motor has a simple configuration and sufficient cooling, and is significantly effective in improving the winding current density and power density of the motor. The first cooling system 400 is arranged in the housing 100 structure and exchanges heat with the heat exchange tube 501 of the second cooling system 500, thereby improving the efficiency of heat conduction and heat dissipation, and significantly reducing the size and weight of the motor as a whole. The stator 200 is cooled by the fourth flow channel 5025, thereby improving the cooling effect and enhancing the overload capacity of the motor.

[0039] In some preferred embodiments, the medium flows in the first cooling system 400 and the heat exchange tube 501 in opposite directions, thereby improving the heat exchange effect. Specifically, the heat exchange tube 501 can be arranged as follows: Fig.13 shown.

[0040] In some preferred embodiments, Figure 1-Figure 6 As shown, the shell 100 includes an outer shell 101, a first end cover 102 and a second end cover 103. Specifically, the outer shell 101 is a cylinder with top and bottom openings, and the first end cover 102 and the second end cover 103 are respectively arranged on the top and bottom openings; the first cooling system 400 includes a plurality of first flow channels 401 arranged in the wall of the outer shell 101 of the shell 100, a first connecting groove 402 arranged on the surface of the first end cover 102 facing the shell 100, and a second connecting groove 403 arranged on the surface of the second end cover 103 facing the shell 100; the plurality of first flow channels 401 are connected in series through the first connecting groove 402 and the second connecting groove 403.

[0041] Preferably, the first flow channel 401 extends along the axial direction of the rotor 300, and has a long strip-shaped cross-section perpendicular to the axial direction of the rotor 300; based on this, the flow cross-sectional area of ​​the first flow channel 401 is larger, thereby increasing the heat exchange with the housing 101 and the stator 200 in the housing 101, thereby improving the heat exchange efficiency.

[0042] In some preferred embodiments, Figure 2 As shown, the first cooling system 400 also includes a first inlet 404 and a first outlet 405; the first inlet 404 is arranged on the shell 101 and is connected to one of the adjacent first flow channels 401; the first outlet 405 is arranged on the shell 101 and is connected to the other of the adjacent first flow channels 401; one end of the first flow channel 401 where the first inlet 404 and the first outlet 405 are arranged is closed; thus, after the cooling medium enters the first flow channel 401 from the first inlet 404, it flows through multiple first flow channels 401, the first connecting groove 402 and the second connecting groove 403 in sequence, and then flows out from the first outlet 405, so that the flow channel length is longer to improve the heat exchange with the shell 100.

[0043] In some preferred embodiments, Figure 3 As shown, the second cooling channel 502 also includes a second flow channel 5021 arranged in the wall of the shell 101 of the shell 100, a third flow channel 5022 arranged on the rotating shaft 301 of the rotor 300 and a first discharge piece 5023 arranged on the outside of the shell 101; one end of the second flow channel 5021 is connected to the heat exchange tube 501, and the other end is connected to one end of the third flow channel 5022; the other end of the third flow channel 5022 forms a first spray outlet 5024 for spraying and cooling the stator 200 and / or the rotor 300; the first spray outlet 5024 is connected to the inner cavity of the shell 100, and the first discharge piece 5023 is connected to the inner cavity of the shell 100, and is used to discharge the cooling medium in the inner cavity of the shell 100; based on the first spray outlet 5024 being arranged on the rotating shaft 301, spray cooling is performed on the part of the rotor 300 close to the rotating shaft 301 side, so as to improve the cooling effect and enhance the overload capacity of the motor.

[0044] More preferably, if Figure 7 As shown, the fourth flow channel 5025 includes an annular third connecting groove 50251 and a plurality of fourth connecting grooves 50252 arranged on the outer peripheral surface of the stator core 202 of the stator 200; the third connecting groove 50251 is connected to the heat exchange tube 501; one end of each fourth connecting groove 50252 passes through the third connecting groove 50251, and the other end passes through the end surface of the stator core 202 to form a second spray outlet 5026; the second flow channel 5021 is connected to the third connecting groove 50251; based on the third connecting groove 50251 and the fourth connecting groove 50252 and the inner wall of the shell 101 forming the fourth flow channel 5025, on the one hand, the cooling of the stator core 202 is achieved, and on the other hand, the connection with the first The heat exchange efficiency between the cooling system 400 is improved, and a second spray outlet 5026 is formed at the end of the fourth connecting groove 50252 to spray the stator winding 201, so as to further improve the uniformity of cooling the stator winding 201 and improve the cooling effect; specifically, a plurality of fourth connecting grooves 50252 are arranged at intervals along the extension direction of the third connecting groove 50251, and are located on both sides of the third connecting groove 50251, so as to cool the stator winding 201 on both sides, and further improve the uniformity of heat dissipation of the stator core 202, so as to reduce the temperature difference between the stator core 202 and the shell 101, and avoid that the temperature difference between the two is too large, resulting in too large a difference in the expansion and contraction due to thermal expansion and contraction, which affects the service life of the structure.

[0045] Further preferably, the second spray outlet 5026 is arranged to form an angle with the axial direction of the stator core 202 to improve the cooling effect on the stator winding 201 .

[0046] Further preferably, the axial angle A of the second spray outlet 5026 with the stator core 202 is 30°, which, on the one hand, improves the spraying of the stator winding 201, and on the other hand, reduces the flow resistance and improves the heat exchange efficiency with the first cooling system.

[0047] In some preferred embodiments, Figure 4 and Fig.12 As shown, the fourth flow channel 5025 also includes a second connecting hole 50253; the second connecting hole 50253 connects the heat exchange tube 501 and the third connecting groove 50251; further preferably, the second connecting hole 50253 includes a countersunk hole and a side hole, one end of the countersunk hole is connected to the third connecting groove 50251, and the other end is connected to the outside, and is provided with a plug; one end of the side hole is connected to the countersunk hole, and the other end is connected to the heat exchange tube 501; thereby, coolant can be added to the second cooling system 500.

[0048] In some preferred embodiments, Figure 3 As shown, the second flow channel 5021 includes a first section 50211, a second section 50212, and a third section 50213 disposed in the first end cover 102 or the second end cover 103 of the housing 100; one end of the first section 50211 is connected to the inner surface of the housing 101, and the other end is connected to the two ends of the second section 50212; one end of the second section 50212 is closed, and the other end is connected to the end surface of the housing 101 to communicate with one end of the third section 50213; the other end of the third section 50213 is connected to the third flow channel 5022; based on the first section 50211 and the second section 50212 of the second flow channel 5021 opened on the housing 101, on the one hand, the space volume occupied by the cooling system is reduced, and on the other hand, the heat exchange between the cooling system and the first cooling system 400 is increased. The temperature of the cooling medium in the second cooling system 500 is further reduced to improve the cooling effect on the stator 200 and the rotor 300.

[0049] Preferably, the second section 50212 is substantially the same as the axial width of the housing 101, and the third section 50213 is substantially in the shape of a “]”.

[0050] Preferably, the end of the second section 50212 protrudes from the end surface of the housing 101 and is accommodated in the third section 50213 ; thereby facilitating the docking between the housing 101 and the first end cover 102 or the second end cover 103 .

[0051] Preferably, one side of the third section 50213 connected to the third flow channel 5022 is a conical expansion structure. Based on this, when the cooling medium flows into the third section 50213, it can flow along the inner wall of the third section 50213, thereby achieving an oil film seal with the third flow channel 5022, and after entering the third flow channel 5022, it is thrown out through the first spray outlet 5024 by centrifugal action, and a low-pressure area is formed in the third flow channel 5022, thereby promoting the cooling medium to flow into the third flow channel 5022.

[0052] Preferably, if Fig. 9 As shown, the first spray outlet 5024 includes a bearing spray outlet 50241 , a winding spray outlet 50242 and an iron core spray outlet 50243 ; the bearing spray outlet 50241 faces the bearing 302 of the rotor 300 and is arranged at an angle to the axial direction of the bearing 302 .

[0053] Preferably, there are multiple bearing spray ports 50241, winding spray ports 50242 and core spray ports 50243, which are evenly distributed along the circumference of the rotating shaft 301 to improve the uniformity of spraying.

[0054] More preferably, if Fig.10 and Fig.11 As shown, the axial angle between the bearing spray port 50241 and the bearing 302 is 40° or 60°. When spraying the right bearing, the angle B can be selected as 60°; when spraying the left bearing, the angle C is 40°; it can also be set to other angles according to the working conditions.

[0055] In some preferred embodiments, Figure 8 As shown, the rotor core 303 of the rotor 300 is provided with a hollow structure 304 axially passing through both ends and a first connecting hole 305 connecting the core spray port 50243 and the hollow structure 304; specifically, the first connecting hole 305 and the core spray port 50243 are arranged in a one-to-one correspondence; based on setting the hollow structure 304 in the rotor core 303, and connecting the hollow structure 304 with the core spray port 50243 through the first connecting hole 305, the cooling medium can be sprayed onto the inner surface of the hollow structure 304, thereby improving the cooling effect on the rotor core 303.

[0056] In some preferred embodiments, Figure 2-Figure 4As shown, the first discharge piece 5023 is a trough structure, which is sealed and connected to the outer surface of the shell 101 to form a buffer space 5027; the buffer space 5027 is connected to the inner cavity of the shell 100, and has a second outlet 5028 for discharging the cooling medium from the buffer space 5027, and the second inlet 5029 is arranged on the shell 101, and the second inlet 5029 is connected to the heat exchange tube 501; specifically, the first discharge piece 5023 is arranged at the bottom of the shell 101 (the motor shaft is arranged in the horizontal direction), so that the cooling medium flows into the buffer space 5027 by its own weight, and then is discharged through the second outlet 5028.

[0057] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A motor, characterized in that: It includes a housing, a stator, a rotor, a first cooling system and a second cooling system; The first cooling system is disposed on the housing and is configured to provide a channel for the flow of a first cooling medium; The second cooling system includes a heat exchange tube and a second cooling channel; The heat exchange tube is located in the first cooling system, and one end of the heat exchange tube is the inlet of the second cooling medium. The other end is connected to one end of the second cooling channel; The second cooling channel includes a fourth flow channel disposed in the stator; One end of the fourth flow channel is connected to the heat exchange tube, and the other end is a second spray outlet for spray cooling the stator winding of the stator.

2. The motor according to claim 1, characterized in that The fourth flow channel includes an annular third communication groove and a plurality of fourth communication grooves arranged on the outer peripheral surface of the stator core of the stator; The third connecting groove is connected to the heat exchange tube; One end of each of the fourth communicating grooves passes through the third communicating groove, and the other end penetrates through the end surface of the stator core to form the second spray outlet.

3. The motor according to claim 1, characterized in that The housing comprises an outer shell, a first end cover and a second end cover; The first cooling system includes a plurality of first flow channels arranged in the outer shell wall of the shell, a first communication groove arranged on the surface of the first end cover facing the shell side, and a second communication groove arranged on the surface of the second end cover facing the shell side; The plurality of first flow channels are connected in series through the first connecting groove and the second connecting groove.

4. The motor according to claim 3, characterized in that The first cooling system further includes a first inlet and a first outlet; The first inlet is disposed in the housing and communicates with one of the adjacent first flow channels; The first outlet is disposed on the housing and communicates with another one of the adjacent first flow channels; One end of the first flow channel where the first inlet and the first outlet are arranged is closed.

5. The motor according to claim 1, characterized in that The second cooling channel further comprises a second flow channel arranged in the shell wall of the housing, a third flow channel arranged in the rotating shaft of the rotor, and a first discharge piece arranged outside the shell; One end of the second flow channel is connected to the heat exchange tube, and the other end is connected to one end of the third flow channel; The other end of the third flow channel forms a first spray outlet for spraying and cooling the stator and / or the rotor; the first spray outlet is connected to the inner cavity of the shell; The first discharge member is connected to the inner cavity of the shell and is used to discharge the cooling medium in the inner cavity of the shell.

6. The motor according to claim 5, characterized in that The first spray outlet includes a bearing spray outlet, a winding spray outlet and an iron core spray outlet; The bearing spray port faces the bearing of the rotor and is arranged at an angle to the axial direction of the bearing.

7. The motor according to claim 6, characterized in that The rotor core of the rotor is provided with a hollow structure penetrating through both ends along the axial direction and a connecting hole connecting the core spray port and the hollow structure.

8. The motor according to claim 5, characterized in that The first discharge member is a trough structure, which is sealed and connected to the outer surface of the shell to form a buffer space; The buffer space is communicated with the inner cavity of the shell and has a second outlet for discharging cooling medium from the buffer space.

9. The motor according to claim 5, characterized in that The second flow channel includes a first section and a second section disposed in the shell wall and a third section disposed in the first end cover or the second end cover of the shell; One end of the first section is connected to the inner surface of the shell, and the other end is connected to between the two ends of the second section; One end of the second section is closed, and the other end is connected to the end surface of the shell to communicate with one end of the third section; The other end of the third section is connected to the third flow channel.

10. The motor according to claim 9, characterized in that The side of the third section connected to the third flow channel is a conical expansion structure.

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