Dual-motor controller and cooling method therefor

Abstract

A dual-motor controller and a cooling method therefor. The dual-motor controller comprises a housing, wherein an inverter brick is mounted inside the housing, and a PDU assembly is mounted at the bottom of the housing. Heat dissipation recesses are formed on the upper and lower surfaces of a water cooling plate, and two groups of IGBT modules are mounted in the corresponding heat dissipation recesses and share one water cooling plate; a first IGBT module and a second IGBT module can share one thin-film capacitor; and a PDU is separately assembled in the housing to form the PDU assembly.

Description

Dual-motor controller and cooling method thereof TECHNICAL FIELD The present application belongs to the technical field of controller, in particular relates to a dual-motor controller and a cooling method thereof. BACKGROUND The structure scheme of the conventional dual-motor controller with boost function of new energy vehicles adopts a stacking method, the controller box is first fixed as a carrier, then internal devices such as two groups of IGBT or SIC modules, two water-cooled plates, two film capacitors, a boost inductor, a boost film capacitor, a PCBA board, a filter assembly, a three-phase copper bar and the like are sequentially placed in the controller box, and finally a cover plate is assembled to realize the function of converting high-voltage direct current into high-voltage alternating current. Disadvantages of the prior art scheme: 1. Two groups of IGBT or SIC modules and a boost inductor are cooled by separate water channels in the controller box, and the water channels are connected in series by welding a cover plate and assembling a water pipe to form a cooling water circuit for cooling the whole machine, which makes the water channels long and occupies a large space in the controller box. 2. The assembly process of the dual-motor controller parts is complex, and manual assembly in sequence is required, which requires a long work station and has low assembly efficiency. 3. The PDU parts of the conventional dual-motor controller with PDU boost function are assembled in the controller box in a scattered manner, resulting in a large box size and poor compatibility. SUMMARY In view of the problems in the background art, the present application provides a dual-motor controller and a cooling method thereof. In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A dual-motor controller, comprising: a box body, an inverter brick is installed inside, and a PDU assembly is installed at the bottom; The inverter brick comprises a water-cooled plate, a plurality of first heat dissipation grooves are formed on the upper surface of the water-cooled plate, and a plurality of second heat dissipation grooves are formed on the lower surface of the water-cooled plate; The first heat dissipation grooves are used for dissipating heat of the first IGBT module installed on the upper surface of the water-cooled plate, and the second heat dissipation grooves are used for dissipating heat of the second IGBT module installed on the lower surface of the water-cooled plate; A first cooling flow channel is further formed in the water-cooled plate, and the first heat dissipation grooves and the second heat dissipation grooves are in communication with the first cooling flow channel; The PDU assembly comprises a PDU shell, a second cooling flow channel is formed in the bottom of the PDU shell and is in communication with the first cooling flow channel, and the second cooling flow channel is used for dissipating heat of the PDU assembly. Preferably, the first cooling flow channel comprises a water outlet flow channel and a water inlet flow channel, the water outlet flow channel and the water inlet flow channel are arranged side by side and are in communication at one end; The water outlet channel is provided with a through hole corresponding to the positions of the first and second heat dissipation grooves, for communication with the first and second heat dissipation grooves. Preferably, a first water channel is formed in a side wall of the box, and one end of the first water channel is in communication with the water outlet channel. The PDU shell is provided with a second water channel in a side wall corresponding to the first water channel; the cross section of the second water channel is in the shape of "L", the vertical section is in communication with the first water channel, and the starting point of the horizontal section is provided with a sealing bowl-shaped plug, and the terminal point is in communication with the second cooling water channel. Preferably, in the inverter brick, a first drive board is mounted on the surface of the first IGBT module, and a second drive board is mounted on the surface of the second IGBT module. The control board is mounted on the side of the water cooling plate away from the inlet of the first cooling water channel. A plurality of three-phase copper bar assemblies are mounted on the other side of the water cooling plate, and the first IGBT module and the second IGBT module are respectively electrically connected with the corresponding three-phase copper bar assemblies. Preferably, in the inverter brick, a thin film capacitor core group is mounted on the side of the water cooling plate away from the three-phase copper bar assembly, and the thin film capacitor core group is electrically connected with the first IGBT module and the second IGBT module through a plurality of terminals. Preferably, in the PDU assembly, a boost inductor is mounted in the PDU shell, and the boost inductor is connected with a negative input copper bar and a positive input copper bar. The negative input copper bar is connected with a magnetic ring fixing seat; the magnetic ring fixing seat is located in the box and on one side of the inverter brick. The positive input copper bar is connected with an external motor. Preferably, the second cooling water channel comprises a PDU water channel. The PDU water channel is in the shape of rectangle, and a symmetric water inlet and a water outlet are formed in the same end; the water inlet is in communication with the second water channel. A first wave-shaped heat dissipation fin is arranged on the center line of the water inlet and the water outlet, and one end of the first wave-shaped heat dissipation fin close to the water outlet is connected with the inner wall of the PDU water channel. The first wave-shaped heat dissipation fin is parallel to the water inlet direction and the water outlet direction. A plurality of second wave-shaped heat dissipation fins are further arranged in the PDU water channel, and the second wave-shaped heat dissipation fins are divided into a plurality of groups and are evenly distributed in the PDU water channel, and are parallel to the first wave-shaped heat dissipation fin. A plurality of elliptical heat dissipation fins are further arranged between the second wave-shaped heat dissipation fins of adjacent groups. Preferably, one end of the first wave-shaped heat dissipation fin away from the inner wall of the PDU water channel and both ends of the second wave-shaped heat dissipation fin are provided with cylinders. Preferably, the PDU water channel is welded with a water channel cover plate. Preferably, the first IGBT module is replaced by a first SIC module, and the second IGBT module is replaced by a second SIC module. A cooling method applied to the double-motor controller, comprising the following steps: During heat dissipation, a part of the cooling medium enters the first cooling flow channel, and then enters the first heat dissipation groove to dissipate heat for the first IGBT module and enters the second heat dissipation groove to dissipate heat for the second IGBT module. Subsequently, the cooling medium enters the second cooling flow channel to dissipate heat for the boost inductor in the PDU shell. Preferably, the cooling medium enters the second cooling flow channel to dissipate heat for the boost inductor in the PDU shell, comprising the following steps: During heat dissipation for the PDU assembly, on the water inlet side, the cooling medium enters the PDU water channel through the water inlet and flows under the guidance of the second wave-shaped heat dissipation fin; When the cooling medium flows to the position of the elliptical heat dissipation fin, it flows in a direction perpendicular to the water inlet until it enters the water outlet side; On the water outlet side, the cooling medium flows under the guidance of the second wave-shaped heat dissipation fin, and the flow direction is opposite to that on the water inlet side, until the cooling medium flows out through the water outlet. Advantages of the present application: 1. The present application shortens the flow channel length by providing heat dissipation grooves on the upper and lower surfaces of the water cooling plate, and installing two groups of IGBT modules on the corresponding heat dissipation grooves, thereby reducing the volume of the controller. 2. The present application allows the first IGBT module and the second IGBT module to share a thin film capacitor, greatly reducing material costs and controller volume. 3. The present application separately assembles the PDU in the shell to form a PDU assembly, and according to different needs of product boost function, the PDU assembly can be integrated and assembled on the double-motor controller, or the PDU assembly can not be integrated and assembled, realizing flexible compatibility of the product and improving the universal adaptability of the product. 4. The PDU water channel mixed heat dissipation fin heat dissipation structure of the present application reflects the water flow in different directions, and forms a serial and parallel integrated flow channel, which can shorten the flow channel length and improve the heat dissipation efficiency.

[0047] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structures indicated in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings. [Corrected according to Rule 91 09.09.2025] Fig. 1 shows an exploded view of a dual motor controller according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 2 shows an assembled view of a dual motor controller according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 3 shows an exploded view of an inverter brick according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 4 shows a top view of a water cooling plate according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 5 shows a bottom view of a water cooling plate according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 6 shows an exploded view of a water cooling plate according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 7 shows a cross-sectional view of a water channel of a water cooling plate according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 8 shows a cross-sectional view of a water channel connection of a dual motor controller according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 9 shows a water channel of a PDU according to the present application; [Corrected according to Rule 91 09.09.2025] Fig. 10 shows an inlet and outlet of a water channel of a PDU according to the present application. In the figure: 1, box body; 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 flow channel; 3114, water inlet flow channel; 3115, through hole; 312, film capacitor core group; 3121, positive and negative electrode input copper bar terminal; 3122, positive and negative electrode output copper bar terminal; 32, first IGBT module; 33, second IGBT module; 34, first drive board; 35, second drive board; 36, control board; 37, three-phase copper bar assembly; 38, first water nozzle; 39, second water nozzle; 4, PDU assembly; 41, PDU shell; 410, PDU water channel; 411, water inlet; 412, water outlet; 413, first wave-shaped heat dissipation fin; 414, second wave-shaped heat dissipation fin; 415, oval-shaped heat dissipation fin; 416, second water channel; 417, cylinder; 42, negative electrode input copper bar; 43, positive electrode input copper bar; 44, boost inductor; 45, sealing bowl-shaped plug; 46, water channel cover plate. DETAILED DESCRIPTION To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. [Corrected according to Rule 91 on 09.09.2025] A dual motor controller, as shown in FIG. 1, includes a box body 1, a magnetic ring fixing seat 2, an inverter 6 brick 3 and a PDU assembly 4. Among them, the magnetic ring fixing seat 2 and the inverter brick 3 are installed inside the box body 1 and located on one side of the inverter brick 3, and the PDU assembly 4 is installed at the bottom of the box body 1. Specifically, the PDU assembly 4 is a device for converting the low-voltage charging pile voltage into the high voltage required by the dual motor controller, which includes a PDU shell 41 and a boost inductor 44, and the bottom of the PDU shell 41 is provided with a second cooling flow channel in communication with the first cooling flow channel, and the second cooling flow channel is used for heat dissipation of the PDU assembly 4. Further, the boost inductor 44 is also provided with a fast charging and direct charging plug port, a filter, a boost film capacitor and a relay. Moreover, the PDU assembly 4 is provided with a negative electrode input copper bar 42 and a positive electrode input copper bar 43, the negative electrode input copper bar 42 is electrically connected with the magnetic ring fixing seat 2, and the positive electrode input copper bar 43 is electrically connected with an external motor, thereby forming a boost circuit path. [Rule 91 correction 09.09.2025] As shown in FIG. 3, 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 bar assemblies 37. The water-cooled plate 31 has a thin film capacitor integrated thereon. The first IGBT module 32 (or first SIC module) and the second IGBT module 33 (or second SIC module) are respectively mounted on the top surface and the bottom surface of the water-cooled plate 31. This layout allows the two groups of IGBT or SIC modules to share one water-cooled plate 31, shortens the flow path length, and reduces the volume of the controller. In addition, the first drive plate 34 is mounted on the surface of the first IGBT module 32, and the second drive plate 35 is mounted on the surface of the second IGBT module 33. The control plate 36 is mounted on the side of the water-cooled plate 31 away from the inlet of the first cooling flow path; and the plurality of three-phase copper bar assemblies 37 are mounted on the other side of the water-cooled plate 31. The first IGBT module 32 and the second IGBT module 33 are respectively electrically connected to the corresponding three-phase copper bar assemblies 37. It should be noted that the above layout utilizes the side space of the water-cooled plate 31 to place the control plate 36, which is close to the first drive plate 34 and the second drive plate 35, thereby shortening the length of the connecting wire harness between the plates, making the controller layout more compact, and maximizing the reduction of the volume of the controller. In addition, the three-phase copper bar assembly 37 can be installed as a separate part on the water-cooled plate 31 to electrically connect the first IGBT module 32 and the second IGBT module 33. The three-phase copper bar assembly 37 can also be integrally molded with the water-cooled plate 31 to improve the integration level and reduce the installation. [Rule 91 correction 09.09.2025] As shown in FIG. 4 and FIG. 5, the water-cooled plate 31 has a plurality of first cooling grooves 3111 formed on the upper surface and a plurality of second cooling grooves 3112 formed on the lower surface. The first cooling grooves 3111 are used to dissipate heat from the first IGBT module 32 mounted on the upper surface of the water-cooled plate 31, and the second cooling grooves 3112 are used to dissipate heat from the second IGBT module 33 mounted on the lower surface of the water-cooled plate 31. The water-cooled plate 31 further has a first cooling flow path formed therein, and the first cooling grooves 3111 and the second cooling grooves 3112 are in communication with the first cooling flow path. Specifically, the first cooling flow path includes a water outlet flow path 3113 and a water inlet flow path 3114, the water outlet flow path 3113 and the water inlet flow path 3114 are arranged side by side and communicate at one end; the water outlet flow path 3113 has a through hole 3115 corresponding to the positions of the first cooling grooves 3111 and the second cooling grooves 3112, for communication with the first cooling grooves 3111 and the second cooling grooves 3112. [According to the rules 91 correction 09.09.2025] It should be noted that, as shown in Figure 7, the first and second heat dissipation grooves 3111 and 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, which connects the first and second heat dissipation grooves 3111 and 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 flows in the direction marked as A. The double-sided water channel structure reduces the space occupied by the water channel and improves the heat dissipation efficiency of the water channel. [According to the rules 91 correction 09.09.2025] As shown in Figure 6, in the inverter brick 3, a film capacitor 311 is mounted on the side of the water-cooled plate 31 away from the three-phase copper bar assembly 37. A film capacitor core group 312 is mounted 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 a plurality of terminals. Specifically, the film capacitor core group 312 is provided with positive and negative input copper bar terminals 3121. The positive and negative input copper bar terminals 3121 are ports for electrically connecting the inverter brick 3 to the direct current bus of the whole vehicle. The film capacitor core group 312 is provided with a plurality of positive and negative output copper bar terminals 3122 arranged in two rows in parallel on the side away from the positive and negative input copper bar terminals 3121. The two rows of positive and negative 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 one film capacitor, greatly reducing the material cost and the size of the controller. [According to the rules 91 correction 09.09.2025] As shown in Figure 8, a first water channel 11 is formed in one side wall of the box body 1, and one end of the first water channel 11 is in communication with the water outlet channel 3113. A second water channel 416 is formed in the side wall of the PDU shell 41 corresponding to the first water channel 11. The cross section of the second water channel 416 is in the shape of "L", the vertical section is in communication with the first water channel 11, and the starting point of the horizontal section is provided with a sealing bowl-shaped plug 45, and the terminal point is in communication with the water inlet 411 of the second cooling channel. [According to the rules 91 correction 09.09.2025] It should be noted that the first water channel 11 is a through structure, the second water channel 416 is an L-shaped through structure, and as shown in Figure 10, the terminal end of the second water channel 416 is in communication with the water inlet 411, and the PDU shell 41 is further provided with a water channel cover plate 46. The water channel cover plate 46 is welded with the PDU water channel 410 to form a cooling liquid flow channel cavity, which provides heat dissipation for the boost inductor 44. [Corrected according to Rule 91 on 09.09.2025] It needs to be further explained that in combination with FIG. 5, FIG. 6 and FIG. 8, it can be known that the water inlet channel 3114 is sealingly connected with the first water nozzle 38, and the cooling medium can enter the water cooling plate 31 through the first water nozzle 38, then flow to the second cooling flow channel of the PDU shell 41, and finally be discharged through the water outlet 412. [Corrected according to Rule 91 on 09.09.2025] As shown in FIG. 9, the second cooling flow channel includes a PDU water channel 410; the water channel is rectangular, and symmetrically provided with an inlet 411 and an outlet 412 at the same end, and it can be known from FIG. 2 that the outlet 412 is connected with the second water nozzle 39. A first wavy-shaped heat dissipation fin 413 is arranged on the center line of the inlet 411 and the outlet 412, and the end of the first wavy-shaped heat dissipation fin 413 close to the outlet 412 is connected with the inner wall of the PDU 9 water channel 410; the first wavy-shaped heat dissipation fin 413 is parallel to the water inlet direction and the water outlet direction; a plurality of second wavy-shaped heat dissipation fins 414 are further arranged in the PDU water channel 410, and the second wavy-shaped heat dissipation fins 414 are evenly distributed in the PDU water channel 410 and parallel to the first wavy-shaped heat dissipation fin 413; a plurality of elliptical heat dissipation fins 415 are further arranged between adjacent groups of second wavy-shaped heat dissipation fins 414. In addition, the end of the first wavy-shaped heat dissipation fin 413 away from the inner wall of the PDU water channel 410 and the two ends of the second wavy-shaped heat dissipation fin 414 are provided with a cylinder 417. It needs to be explained that the wavy-shaped heat dissipation fin can reflect the water flow in different directions to increase the heat dissipation effect. The cylinder 417 can further increase the water flow direction of the cooling liquid to increase the heat dissipation effect. In addition, the wavy-shaped heat dissipation fin and the elliptical heat dissipation fin 415 are mixedly arranged to form a serial and parallel integrated flow channel, which can shorten the flow channel length and improve the heat dissipation efficiency. A cooling method applied to the above-mentioned dual-motor controller, comprising the following steps: S1: when dissipating heat, the cooling medium enters the water inlet channel 3114 through the first water nozzle 38 and flows, and then enters the first heat dissipation groove 3111 through the through hole 3115 to dissipate heat for the first IGBT module 32 and enters the second heat dissipation groove 3112 to dissipate heat for the second IGBT module 33. Subsequently, the cooling medium enters the water outlet channel 3113 and reaches the water inlet 411 through the first water channel 11 and the second water channel 416. S2: After the cooling medium enters the PDU water channel 410 through the water inlet 411, the boost inductor 44 in the PDU shell 41 is cooled. [Corrected according to Rule 91 on 09.09.2025] It should be noted that in combination with Figure 9, in S2, the following steps are specifically included: S201: When the PDU assembly 4 is cooled, on the side of the water inlet 411, the cooling medium enters the PDU water channel 410 through the water inlet 411 and flows under the guidance of the second wave-shaped heat dissipation fin 414 (the flow path is marked B). S202: When the cooling medium flows to the position of the elliptical heat dissipation fin 415, it flows in a direction perpendicular to the water inlet 411 until it enters the side of the water outlet 412. S203: On the side of the water outlet 412, the cooling medium flows under the guidance of the second wave-shaped heat dissipation fin 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. As can be seen from the above process, when the controller is cooled, the first cooling flow channel is used to cool the components on both sides of the water-cooled plate 31, and the cooling medium in the first cooling flow channel can enter the second cooling flow channel to cool the PDU assembly 4. The structure corresponding to this method places part of the equipment in the cabinet 1 in the PDU shell 41, and then cools separately, not only providing a cooling water channel for the two groups of IGBT or SIC modules at the same time, but also being compact in structure and high in cooling efficiency, and shortening the flow channel length and reducing the volume of the controller; the inverter brick 3 is high in structural integration and compact in structure, and realizes the miniaturization requirement of the controller. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; 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 application.

Claims

1. A dual motor controller, characterized by, Include: Box (1), inside install inverter brick (3), bottom install PDU assembly (4); The inverter brick (3) comprises a water cooling plate (31), a plurality of first heat dissipation grooves (3111) are formed on the upper surface of the water cooling plate (31), and a plurality of second heat dissipation grooves (3112) are formed on the lower surface of the water cooling plate (31); The first heat dissipation groove (3111) is used for dissipating heat of the first IGBT module (32) installed on the upper surface of the water cooling plate (31), and the second heat dissipation groove (3112) is used for dissipating heat of the second IGBT module (33) installed on the lower surface of the water cooling plate (31); The water cooling plate (31) is further provided with a first cooling flow channel, and the first heat dissipation groove (3111) and the second heat dissipation groove (3112) are in communication with the first cooling flow channel; The PDU assembly (4) comprises a PDU shell (41), and the PDU shell (41) is provided with a second cooling flow channel at the bottom, which is in communication with the first cooling flow channel, and the second cooling flow channel is used for dissipating heat of the PDU assembly (4).

2. A dual motor controller according to claim 1, wherein, The first cooling flow channel comprises a water outlet flow channel (3113) and a water inlet flow channel (3114), the water outlet flow channel (3113) and the water inlet flow channel (3114) are arranged side by side, and one end is communicated; The water outlet flow channel (3113) is provided with a through hole (3115) corresponding to the positions of the first heat dissipation groove (3111) and the second heat dissipation groove (3112), which is used for communication with the first heat dissipation groove (3111) and the second heat dissipation groove (3112).

3. A dual motor controller according to claim 2, wherein, A first water channel (11) is formed in one side wall of the box (1), and one end of the first water channel (11) is in communication with the water outlet flow channel (3113); The PDU shell (41) is provided with a second water channel (416) corresponding to the side wall of the first water channel (11); the cross section of the second water channel (416) is "L" shape, the vertical section is in communication with the first water channel (11), the starting point of the horizontal section is provided with a sealing bowl-shaped plug (45), and the terminal point is in communication with the second cooling flow channel.

4. A dual motor controller according to claim 1, wherein, In the inverter brick (3), the first IGBT module (32) is provided with a first drive plate (34) on the surface, and the second IGBT module (33) is provided with a second drive plate (35) on the surface; The water cooling plate (31) is provided with a control plate (36) on the side away from the inlet of the first cooling flow channel; A plurality of three-phase copper bar 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 respectively electrically connected with the corresponding three-phase copper bar assembly (37).

5. A dual motor controller according to claim 4, wherein, In the inverter brick (3), the water cooling plate (31) is provided with a thin film capacitor core group (312) on the side away from the three-phase copper bar assembly (37), and the thin film capacitor core group (312) is electrically connected with the first IGBT module (32) and the second IGBT module (33) through a plurality of terminals.

6. A dual motor controller according to claim 1, wherein, In the PDU assembly (4), the PDU shell (41) is provided with a boost inductor (44), and the boost inductor (44) is connected with a negative input copper bar (42) and a positive input copper bar (43). The negative electrode input copper bar (42) is connected with a magnetic ring fixing seat (2); the magnetic ring fixing seat (2) is located in the box body (1) and on one side of the inversion brick (3); The positive electrode input copper bar (43) is connected with an external motor.

7. A dual motor controller according to claim 3, wherein, The second cooling flow channel comprises a PDU water channel (410); The PDU water channel (410) is rectangular, and symmetric water inlets (411) and water outlets (412) are arranged at the same end; the water inlets (411) are communicated with the second water channel (416); First wave-shaped heat dissipation fins (413) are arranged on the center lines of the water inlets (411) and the water outlets (412); one end of the first wave-shaped heat dissipation fins (413) close to the water outlets (412) is connected with 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 outlet direction; A plurality of second wave-shaped heat dissipation fins (414) are further arranged in the PDU water channel (410); the second wave-shaped heat dissipation fins (414) are divided into a plurality of groups and are evenly distributed in the PDU water channel (410) and are parallel to the first wave-shaped heat dissipation fins (413); A plurality of elliptical heat dissipation fins (415) are further arranged between the second wave-shaped heat dissipation fins (414) of adjacent groups.

8. A dual motor controller according to claim 7, wherein, Cylinders (417) are arranged at the ends of the first wave-shaped heat dissipation fins (413) away from the inner wall of the PDU water channel (410) and the two ends of the second wave-shaped heat dissipation fins (414).

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

10. A dual motor controller according to claim 1, wherein, 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).

11. A cooling method applied to a dual-motor controller according to any one of claims 7-9, characterized in that, The method comprises the following steps: During heat dissipation, a part of the cooling medium enters the first cooling flow channel, enters the first heat dissipation groove (3111) to dissipate heat for the first IGBT module (32) and enters the second heat dissipation groove (3112) to dissipate heat for the second IGBT module (33); Subsequently, the cooling medium enters the second cooling flow channel to dissipate heat for the boost inductor (44) in the PDU shell (41).

12. A cooling method according to claim 11, characterized in that, The method for dissipating heat for the boost inductor (44) in the PDU shell (41) by the cooling medium entering the second cooling flow channel comprises the following steps: During heat dissipation for the PDU assembly (4), on the side of the water inlet (411), the cooling medium enters the PDU water channel (410) through the water inlet (411) and flows under the guidance of the second wave-shaped heat dissipation fins (414); When the cooling medium flows to the position of the elliptical heat dissipation fin (415), the cooling medium flows in a direction perpendicular to the water inlet (411) until the cooling medium enters the side of the water outlet (412); On the side of the water outlet (412), the cooling medium flows under the guidance of the second wave-shaped heat dissipation fins (414) and the flow direction is opposite to that on the side of the water inlet (411), and the cooling medium flows out through the water outlet (412).

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