Dual-motor controller

Abstract

The utility model belongs to the technical field of controllers, and provides a dual-motor controller, which comprises a box body, a magnetic ring fixing seat, an inverter brick and a PDU assembly. Wherein the magnetic ring fixing seat and the inversion brick are installed in the box body and located on one side of the inversion brick, and the PDU assembly is installed at the bottom of the box body. According to the utility model, the heat dissipation grooves are arranged on the upper and lower surfaces of the water cooling plate, and the two groups of IGBT modules are arranged on the corresponding heat dissipation grooves and share one water cooling plate, so that the length of a flow channel is shortened, and the size of the controller is reduced; according to the utility model, the first IGBT module and the second IGBT module can share one thin-film capacitor, so that the material cost and the size of the controller are greatly reduced; according to the utility model, the PDU is independently assembled in the shell to form the PDU component, and the PDU component can be integrally assembled on the dual-motor controller or not integrally assembled according to different requirements of boosting functions of products, so that the flexible compatibility of the products is realized, and the universal adaptability of the products is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of controllers, and particularly relates to a dual-motor controller. Background Art

[0002] The structural scheme of the dual-motor controller with boost function of traditional new energy vehicles adopts the superposition method. First, the controller box is fixed as a carrier, and then the internal devices such as two groups of IGBT or SIC modules, two water-cooling plates, two film capacitors, boost inductors, boost film capacitors, PCBA boards, filter components, three-phase copper busbars and other devices are placed in the controller box in sequence, and finally the cover plate is assembled to realize the function of high-voltage DC to high-voltage AC conversion of the dual-motor controller.

[0003] Disadvantages of existing technical solutions:

[0004] 1. Two groups of IGBT or SIC modules and boost inductors are cooled by separate water channels in the controller box. The water channels are connected in series by welding covers, assembling water pipes, etc. to form a cooling water path to dissipate heat for the entire machine. This solution makes the water channel long and occupies a large space in the controller box.

[0005] 2. The assembly process of dual-motor controller parts is complicated and needs to be manually assembled in sequence, requiring a long workstation and low assembly efficiency.

[0006] 3. The PDU components of the traditional dual-motor controller with PDU boost function are dispersedly assembled in the controller box, resulting in a large box size and poor compatibility. Utility Model Content

[0007] In view of the problems in the background technology, the utility model proposes a dual-motor controller.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A dual-motor controller, comprising:

[0010] The box has an inverter brick installed inside and a PDU component installed at the bottom;

[0011] The inverter brick comprises a water cooling plate and a film capacitor, wherein the first IGBT module is installed on the upper surface of the water cooling plate, and the second IGBT module is installed on the lower surface;

[0012] The film capacitor core group is provided with positive and negative electrode input copper bar terminals, and the positive and negative electrode input copper bar terminals are ports for electrical connection between the inverter brick and the DC busbar of the whole vehicle;

[0013] A potting cavity is provided in the film capacitor, a film capacitor core group is installed in the potting cavity, and a plurality of positive and negative output copper busbar terminals are arranged in parallel in a plurality of rows on the side of the film capacitor core group away from the positive and negative input copper busbar terminals;

[0014] The plurality of rows of positive and negative copper busbar terminals are electrically connected to the first IGBT module and the second IGBT module respectively.

[0015] Preferably, a first cooling channel is provided inside the water cooling plate for dissipating heat from the first IGBT module and the second IGBT module;

[0016] The PDU assembly comprises a PDU shell, and a second cooling channel communicating with the first cooling channel is provided at the bottom of the PDU shell, and the second cooling channel is used for dissipating heat to the PDU assembly.

[0017] Preferably, a first water channel is opened on one side wall of the box body, and one end of the first water channel is connected to the water outlet end of the first cooling channel;

[0018] A second water channel is opened on the side wall of the PDU shell corresponding to the first water channel; the cross-section of the second water channel is "L"-shaped, the vertical section is connected to the first water channel, a sealing bowl-shaped plug is installed at the starting point of the horizontal section, and the end point is connected to the second cooling channel.

[0019] Preferably, in the inverter brick, a first driving board is mounted on the surface of the first IGBT module, and a second driving board is mounted on the surface of the second IGBT module;

[0020] A control panel is installed on the side of the water cooling plate away from the inlet of the first cooling channel;

[0021] A plurality of three-phase copper busbar assemblies are installed on the other side of the water cooling plate, and the first IGBT module and the second IGBT module are electrically connected to the corresponding three-phase copper busbar assemblies respectively.

[0022] Preferably, in the inverter brick, the film capacitor core group is installed on the side of the water cooling plate away from the three-phase copper busbar assembly.

[0023] Preferably, in the PDU assembly, a boost inductor is installed in the PDU housing, and the boost inductor is connected to a negative input copper busbar and a positive input copper busbar;

[0024] The negative input copper bar is connected to a magnetic ring fixing seat; the magnetic ring fixing seat is located in the box and on one side of the inverter brick;

[0025] The positive input copper bus is connected to an external motor.

[0026] Preferably, the second cooling channel comprises a PDU water channel;

[0027] The PDU water channel is rectangular, with a symmetrical water inlet and water outlet at the same end, and the water inlet is connected to the second water channel;

[0028] A first wavy heat dissipation fin is arranged on the center line of the water inlet and the water outlet, and one end of the first wavy heat dissipation fin close to the water outlet is connected to the inner wall of the PDU water channel;

[0029] The first wave-shaped heat dissipation fins are parallel to the water inlet direction and the water discharge direction;

[0030] A plurality of second wavy heat dissipation fins are also arranged in the PDU water channel, and the second wavy heat dissipation fins are divided into a plurality of groups and are evenly distributed in the PDU water channel, and are all parallel to the first wavy heat dissipation fins;

[0031] A plurality of elliptical heat dissipation fins are also arranged between adjacent groups of second wavy heat dissipation fins.

[0032] Preferably, cylinders are provided at one end of the first wavy heat dissipating fin away from the inner wall of the PDU water channel and at both ends of the second wavy heat dissipating fin.

[0033] Preferably, the PDU water channel is welded with a water channel cover plate.

[0034] Preferably, the first SIC module is used to replace the first IGBT module, and the second SIC module is used to replace the second IGBT module.

[0035] Beneficial effects of the utility model:

[0036] 1. The utility model enables the first IGBT module and the second IGBT module to share a thin film capacitor, greatly reducing material costs and controller volume;

[0037] 2. The utility model provides heat dissipation grooves on the upper and lower surfaces of the water cooling plate, and two groups of IGBT modules are installed on the corresponding heat dissipation grooves, sharing a water cooling plate, shortening the flow channel length, thereby reducing the volume of the controller;

[0038] 3. The utility model separately assembles the PDU in the housing to form a PDU component. According to the different requirements of the product boost function, the PDU component can be integrated and assembled on the dual-motor controller, or the PDU component can be assembled without integration, so that the product has flexible compatibility and improves the universal adaptability of the product;

[0039] 4. The PDU water channel mixed heat dissipation fin heat dissipation structure of the utility model makes the coolant reflect the water flow in different directions, and simultaneously forms a serial and parallel integrated flow channel, which can shorten the flow channel length and improve the heat dissipation efficiency.

[0040] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1a An exploded schematic diagram of a dual-motor controller of the utility model is shown;

[0043] Figure 1b The utility model shows a schematic diagram of the assembly of a dual-motor controller;

[0044] Figure 2 An exploded view of the inverter brick of the present invention is shown;

[0045] Figure 3 A schematic diagram of the top surface of the water cooling plate of the utility model is shown;

[0046] Figure 4 A schematic diagram of the bottom surface of the water cooling plate of the utility model is shown;

[0047] Figure 5 An exploded schematic diagram of the water cooling plate structure of the utility model is shown;

[0048] Figure 6 A schematic cross-sectional view of a water channel of a water cooling plate of the utility model is shown;

[0049] Figure 7 The schematic diagram of the cross-sectional structure of the water channel connection of the dual-motor controller of the utility model is shown;

[0050] Figure 8 A schematic diagram of a PDU water channel of the utility model is shown;

[0051] Fig. 9 A schematic diagram of the water inlet and outlet of the PDU water channel of the utility model is shown.

[0052] In the figure: 1, box; 11, first water channel; 2, magnetic ring fixing seat; 3, inverter brick; 31, water cooling plate; 311, film capacitor; 3110, potting cavity; 3111, first heat dissipation groove; 3112, second heat dissipation groove; 3113, water outlet channel; 3114, water inlet channel; 3115, through hole; 312, film capacitor core group; 3121, positive and negative input copper bus terminals; 3122, positive and negative output copper bus terminals; 32, first IGBT module; 33, second IGBT module; 34, first driver board; 35, The second drive board; 36. Control board; 37. Three-phase copper busbar assembly; 38. First water faucet; 39. Second water faucet; 4. PDU assembly; 41. PDU shell; 410. PDU water channel; 411. Water inlet; 412. Water outlet; 413. First wavy cooling fins; 414. Second wavy cooling fins; 415. Elliptical cooling fins; 416. Second water channel; 417. Cylinder; 42. Negative input copper busbar; 43. Positive input copper busbar; 44. Boost inductor; 45. Sealing bowl-shaped plug; 46. Water channel cover. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0054] A dual motor controller, such as Figure 1a As shown, it includes a box body 1, a magnetic ring fixing seat 2, an inverter brick 3 and a PDU component 4. The magnetic ring fixing seat 2 and the inverter brick 3 are installed inside the box body 1 and are located on one side of the inverter brick 3, and the PDU component 4 is installed at the bottom of the box body 1. Specifically, the PDU component 4 is a device that converts the low-voltage charging pile voltage into the high voltage required by the dual-motor controller, including a PDU shell 41 and a boost inductor 44. A second cooling channel connected to the first cooling channel is opened at the bottom of the PDU shell 41, and the second cooling channel is used to dissipate heat for the PDU component 4.

[0055] Furthermore, the boost inductor 44 is also provided with a fast charging and direct charging plug-in port, a filter, a boost film capacitor, and a relay. In addition, the PDU component 4 is provided with a negative input copper bar 42 and a positive input copper bar 43, the negative input copper bar 42 is electrically connected to the magnetic ring fixing seat 2, and the positive input copper bar 43 is electrically connected to the external motor, thereby forming a boost circuit path.

[0056] like Figure 2As shown, the inverter brick 3 includes a water-cooled plate 31, a first IGBT module 32, a second IGBT module 33, a first drive plate 34, a second drive plate 35, a control plate 36, and two or more three-phase copper busbar assemblies 37. The water-cooled plate 31 is integrated with a film capacitor core. The first IGBT module 32 (or the first SIC module) and the second IGBT module 33 (or the second SIC module) are respectively mounted on the top and bottom surfaces of the water-cooled plate 31. This layout allows two groups of IGBT or SIC modules to share one water-cooled plate 31, shortening the flow channel length and reducing the volume of the controller.

[0057] In addition, the first drive board 34 is mounted on the surface of the first IGBT module 32, and the second drive board 35 is mounted on the surface of the second IGBT module 33. The control board 36 is mounted on the side of the water-cooling plate 31 away from the inlet of the first cooling channel; a plurality of three-phase copper busbar assemblies 37 are mounted on the other side of the water-cooling plate 31, and the first IGBT module 32 and the second IGBT module 33 are electrically connected to the corresponding three-phase copper busbar assemblies 37 respectively.

[0058] It should be noted that the above layout utilizes the side space of the water-cooled plate 31 to place the control board 36, and is close to the first drive board 34 and the second drive board 35, shortening the length of the connecting harness between the boards, making the controller layout more compact, and minimizing the size of the controller. In addition, the three-phase copper busbar assembly 37 can be installed on the water-cooled plate 31 as a separate part and electrically connected to the first IGBT module 32 and the second IGBT module 33. The three-phase copper busbar assembly 37 can also be integrally molded with the water-cooled plate 31 to improve integration and reduce installation.

[0059] like Figure 3 and Figure 4 As shown, a plurality of first heat dissipation grooves 3111 are provided on the upper surface of the water-cooled plate 31, and a plurality of second heat dissipation grooves 3112 are provided on the lower surface. The first heat dissipation groove 3111 is used to dissipate heat for the first IGBT module 32 mounted on the upper surface of the water-cooled plate 31, and the second heat dissipation groove 3112 is used to dissipate heat for the second IGBT module 33 mounted on the lower surface of the water-cooled plate 31. A first cooling channel is also provided inside the water-cooled plate 31, and the first heat dissipation groove 3111 and the second heat dissipation groove 3112 are both connected to the first cooling channel. Specifically, the first cooling channel includes a water outlet channel 3113 and a water inlet channel 3114, and the water outlet channel 3113 and the water inlet channel 3114 are arranged side by side and connected at one end; a through hole 3115 is provided in the water outlet channel 3113 at positions corresponding to the first heat dissipation groove 3111 and the second heat dissipation groove 3112, which is used to communicate with the first heat dissipation groove 3111 and the second heat dissipation groove 3112.

[0060] It should be noted that if Figure 6As shown, the first heat dissipation slot 3111 and the second heat dissipation slot 3112 are groove structures. The water outlet channel 3113 and the water inlet channel 3114 are circular or elliptical structures. The through hole 3115 can be a waist-shaped hole, a square hole or a special-shaped hole structure. The through hole 3115 connects the first heat dissipation slot 3111 and the second heat dissipation slot 3112 with the water outlet channel 3113 and the water inlet channel 3114 to form a double-sided parallel heat dissipation water channel, wherein the cooling medium flow direction is marked as A. This double-sided water channel structure reduces the space occupied by the water channel and improves the heat dissipation efficiency of the water channel.

[0061] like Figure 5 As shown, in the inverter brick 3, a film capacitor 311 is installed on the side of the water-cooling plate 31 away from the three-phase copper bar assembly 37, and a film capacitor core group 312 is installed in the potting cavity 3110 of the film capacitor 311. The film capacitor core group 312 is electrically connected to the first IGBT module 32 and the second IGBT module 33 through multiple terminals. Specifically, the film capacitor core group 312 is provided with positive and negative pole input copper bar terminals 3121, and the positive and negative pole input copper bar terminals 3121 are ports for electrically connecting the inverter brick 3 to the DC bus of the whole vehicle. The film capacitor core group 312 is provided with a plurality of positive and negative pole output copper bar terminals 3122 arranged in parallel in two rows above and below on the side away from the positive and negative pole input copper bar terminals 3121. The two rows of positive and negative pole output copper bar terminals 3122 are electrically connected to the first IGBT module 32 and the second IGBT module 33 respectively. This structure allows the first IGBT module 32 and the second IGBT module 33 to share a film capacitor, greatly reducing the material cost and the volume of the controller.

[0062] like Figure 7 As shown, a first water channel 11 is provided on one side wall of the housing 1, and one end of the first water channel 11 is connected to the water outlet channel 3113. A second water channel 416 is provided on the side wall of the PDU housing 41 corresponding to the first water channel 11; the cross section of the second water channel (416) is "L"-shaped, the vertical section is connected to the first water channel 11, a sealing bowl-shaped plug 45 is installed at the starting point of the horizontal section, and the end point is connected to the water inlet 411 of the second cooling channel.

[0063] It should be noted that the first water channel 11 is a through-type structure at both ends, and the second water channel 416 is an L-shaped through-type structure. Fig. 9 It can be seen that the end of the second water channel 416 is connected to the water inlet 411, and a water channel cover plate 46 is also provided on the PDU housing 41. The water channel cover plate 46 is welded with the PDU water channel 410 to form a coolant flow channel cavity, which provides heat dissipation for the boost inductor 44.

[0064] It should be further explained that, combined with Figure 4 , Figure 5 and Figure 7It can be seen that the water inlet channel 3114 is sealed and connected with the first water nozzle 38 , and the cooling medium can enter the water-cooled plate 31 through the first water nozzle 38 , then flow to the second cooling channel of the PDU shell 41 , and finally be discharged through the water outlet 412 .

[0065] like Figure 8 As shown, the second cooling channel includes a PDU water channel 410; the water channel is rectangular, with a symmetrical water inlet 411 and a water outlet 412 at the same end, and Figure 1b It can be seen that the water outlet 412 is connected to the second water nozzle 39. A first wavy heat dissipation fin 413 is arranged on the center line of the water inlet 411 and the water outlet 412, and one end of the first wavy heat dissipation fin 413 close to the water outlet 412 is connected to the inner wall of the PDU water channel 410; the first wavy heat dissipation fin 413 is parallel to the water inlet direction and the water discharge direction; a plurality of second wavy heat dissipation fins 414 are also arranged in the PDU water channel 410, and the second wavy heat dissipation fins 414 are divided into a plurality of groups and evenly distributed in the PDU water channel 410, and are all parallel to the first wavy heat dissipation fins 413; a plurality of elliptical heat dissipation fins 415 are also arranged between adjacent groups of second wavy heat dissipation fins 414.

[0066] In addition, cylinders 417 are provided at one end of the first wavy heat dissipating fin 413 away from the inner wall of the PDU water channel 410 and at both ends of the second wavy heat dissipating fin 414 .

[0067] It should be noted that the wavy heat dissipation fins can reflect the water flow of the coolant in different directions, thereby increasing the heat dissipation effect. The cylinder 417 can further increase the water flow direction of the coolant, thereby increasing the heat dissipation effect. In addition, the wavy heat dissipation fins are mixed with the elliptical heat dissipation fins 415 to form a serial and parallel integrated flow channel, which can shorten the flow channel length and improve the heat dissipation efficiency.

[0068] A cooling method, applied to the above-mentioned dual-motor controller, comprises the following steps:

[0069] S1: During heat dissipation, the cooling medium enters the water inlet channel 3114 through the first water nozzle 38 and flows, then enters the first heat dissipation slot 3111 through the through hole 3115 to dissipate heat for the first IGBT module 32 and enters the second heat dissipation slot 3112 to dissipate heat for the second IGBT module 33. The cooling medium then enters the water outlet channel 3113 and reaches the water inlet 411 through the first water channel 11 and the second water channel 416.

[0070] S2: After the cooling medium enters the PDU water channel 410 through the water inlet 411 , it dissipates heat from the boost inductor 44 in the PDU housing 41 .

[0071] It should be noted that, combined with Figure 8 It can be seen that S2 specifically includes the following steps:

[0072] S201: When the PDU assembly 4 is cooled, the cooling medium enters the PDU water channel 410 through the water inlet 411 on one side of the water inlet 411 and flows under the guidance of the second wavy cooling fins 414 (the flow path is shown in mark B).

[0073] S202 : When the cooling medium flows to the position of the elliptical heat dissipation fins 415 , it flows in a direction perpendicular to the water inlet 411 until it enters the side of the water outlet 412 .

[0074] S203 : On the side of the water outlet 412 , the cooling medium flows under the guidance of the second wave-shaped heat dissipating fins 414 , and the flow direction is opposite to that on the side of the water inlet 411 , until the cooling medium flows out through the water outlet 412 .

[0075] It can be seen from the above process that when the controller dissipates heat, the first cooling channel is used to dissipate heat for the components on both sides of the water-cooled plate 31, and at the same time, the cooling medium in the first cooling channel can enter the second cooling channel to dissipate heat for the PDU component 4. The structure corresponding to this method places part of the equipment in the box 1 in the PDU housing 41, and then dissipates heat separately, which not only provides cooling water channels for two groups of IGBT or SIC modules at the same time, has a compact structure and high heat dissipation efficiency, but also shortens the channel length and reduces the volume of the controller; the inverter brick 3 has a high degree of structural integration and a compact structure, which realizes the miniaturization requirements of the controller.

[0076] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual motor controller, characterized in that: include: A box (1) is provided with an inverter brick (3) inside and a PDU assembly (4) is installed at the bottom; The inverter brick (3) comprises a water cooling plate (31) and a film capacitor (311); the water cooling plate (31) has a first IGBT module (32) installed on the upper surface, and a second IGBT module (33) installed on the lower surface; The film capacitor (311) core group is provided with positive and negative electrode input copper bar terminals (3121), and the positive and negative electrode input copper bar terminals (3121) are ports for electrically connecting the inverter brick (3) to the DC busbar of the whole vehicle; A potting cavity (3110) is provided in the film capacitor (311), a film capacitor core group (312) is installed in the potting cavity (3110), and a plurality of positive and negative output copper busbar terminals (3122) arranged in parallel in a plurality of rows are provided on a side of the film capacitor core group (312) away from the positive and negative input copper busbar terminals (3121); The plurality of rows of positive and negative electrode output copper bar terminals are electrically connected to the first IGBT module (32) and the second IGBT module (33) respectively.

2. A dual-motor controller according to claim 1, characterized in that: A first cooling channel is also provided inside the water cooling plate (31) for dissipating heat from the first IGBT module (32) and the second IGBT module (33); The PDU assembly (4) comprises a PDU shell (41), and a second cooling channel connected to the first cooling channel is provided at the bottom of the PDU shell (41), and the second cooling channel is used to dissipate heat for the PDU assembly (4).

3. A dual-motor controller according to claim 2, characterized in that: A first water channel (11) is provided on one side wall of the box body (1), and one end of the first water channel (11) is connected to the water outlet end of the first cooling channel; A second water channel (416) is provided on the side wall of the PDU housing (41) corresponding to the first water channel (11); the cross section of the second water channel (416) is L-shaped, the vertical section is connected to the first water channel (11), a sealing bowl-shaped plug (45) is installed at the starting point of the horizontal section, and the end point is connected to the second cooling channel.

4. A dual-motor controller according to claim 2, characterized in that: In the inverter brick (3), a first drive board (34) is mounted on the surface of the first IGBT module (32), and a second drive board (35) is mounted on the surface of the second IGBT module (33); A control panel (36) is installed on the side of the water cooling plate (31) away from the inlet of the first cooling channel; A plurality of three-phase copper busbar assemblies (37) are installed on the other side of the water cooling plate (31), and the first IGBT module (32) and the second IGBT module (33) are electrically connected to the corresponding three-phase copper busbar assemblies (37), respectively.

5. A dual-motor controller according to claim 4, characterized in that: In the inverter brick (3), the film capacitor core group (312) is installed on the side of the water cooling plate (31) away from the three-phase copper busbar assembly (37).

6. A dual-motor controller according to claim 2, characterized in that: In the PDU assembly (4), a boost inductor (44) is installed in the PDU housing (41), and the boost inductor (44) is connected to a negative input copper busbar (42) and a positive input copper busbar (43); The negative electrode input copper bar (42) is connected to a magnetic ring fixing seat (2); the magnetic ring fixing seat (2) is located in the box (1) and on one side of the inverter brick (3); The positive input copper busbar (43) is connected to an external motor.

7. A dual-motor controller according to claim 3, characterized in that: The second cooling channel includes a PDU water channel (410); The PDU water channel (410) is rectangular, and has a symmetrical water inlet (411) and a water outlet (412) at the same end, and the water inlet (411) is connected to the second water channel (416); A first wavy heat dissipation fin (413) is arranged on the center line of the water inlet (411) and the water outlet (412), and one end of the first wavy heat dissipation fin (413) close to the water outlet (412) is connected to the inner wall of the PDU water channel (410); The first wave-shaped heat dissipation fins (413) are parallel to the water inlet direction and the water discharge direction; A plurality of second wavy heat dissipation fins (414) are also arranged in the PDU water channel (410), and the second wavy heat dissipation fins (414) are divided into a plurality of groups and are evenly distributed in the PDU water channel (410), and are all parallel to the first wavy heat dissipation fins (413); A plurality of elliptical heat dissipation fins (415) are also arranged between adjacent groups of second wave-shaped heat dissipation fins (414).

8. A dual-motor controller according to claim 7, characterized in that: Columns (417) are provided at one end of the first wavy heat dissipation fin (413) away from the inner wall of the PDU water channel (410) and at both ends of the second wavy heat dissipation fin (414).

9. A dual-motor controller according to claim 7, characterized in that: The PDU water channel (410) is welded with a water channel cover plate (46).

10. A dual-motor controller according to claim 2, characterized in that: The first SIC module is used to replace the first IGBT module (32), and the second SIC module is used to replace the second IGBT module (33).

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