A six-phase motor drive controller for electric vehicles

Abstract

The application relates to a six-phase motor driving controller for electric vehicles, which comprises a mounting frame, a six-phase output assembly arranged above the mounting frame, and an input capacitor and an input filter arranged below the mounting frame. The six-phase output assembly is of a T-shaped structure, and a first power device and a second power device are symmetrically arranged on the two sides of the middle rod of the T-shaped structure and connected with the input end of the six-phase output assembly; the input filter comprises a lower shell, a magnetic ring, an upper shell, a positive plate, a negative plate, a grounding sheet and a common-mode capacitor, the positive plate and the negative plate are arranged in a laminated mode to form a plate assembly, the magnetic ring is nested at the rear end of the plate assembly, the magnetic ring is fixed on the lower shell through the upper shell, the common-mode capacitor is potted on the lower shell, the front end of the plate assembly is electrically connected with one end of the common-mode capacitor, and the input end of the input capacitor is connected with the rear end of the plate assembly. Compared with the prior art, the application has the advantages of optimizing the controller structure, improving the heat dissipation capacity, enhancing the anti-electromagnetic interference capacity, and significantly improving the working stability.

Description

TECHNICAL FIELD

[0001] The present application relates to a drive controller, in particular to a six-phase motor drive controller for electric vehicles. BACKGROUND

[0002] With the continuous development of traditional new energy vehicles, electric vehicles have gradually shifted from small power rental cars to large power SUV pure electric vehicles for home use. Large SUV electric vehicles are large in size and heavy in weight, so the drive motor is required to output more power and torque, which requires the drive controller itself to output more power and current to meet the working requirements of the drive motor. Under normal circumstances, a three-phase high-power motor drive is selected for permanent magnet synchronous motor to meet the demand of high-power electric vehicles. The current of each phase of the motor is very large, and the output of the drive controller is also three-phase, and the corresponding AC side output current is also very large, which puts very high requirements on the heat dissipation and use of the power module, and even some modules cannot meet the requirements of such large current output and heat dissipation, resulting in damage to the module. Moreover, during the use of the three-phase motor, if one phase fails, the entire motor will stop rotating.

[0003] The existing solution is to convert three-phase output into six-phase output, and use two power devices to realize inverter output to meet the six-phase output. However, the structure of the existing six-phase output controller still has problems in management and filter design: the power module generally uses single-sided heat dissipation, and the heat dissipation capacity is limited, resulting in poor thermal stability of the system; at the same time, the existing structure of the six-phase output controller often has electromagnetic interference problems, which affects the working stability of the power module, and even causes damage to the motor controller in extreme cases, which is difficult to meet the customer's use requirements. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a six-phase motor drive controller for electric vehicles, which optimizes the structure of the controller, improves the heat dissipation capacity, enhances the anti-electromagnetic interference ability, and significantly improves the working stability of the motor drive controller.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] The utility model provides a kind of six-phase motor drive controller for electric vehicle, including mounting frame, first power device, second power device, six-phase output component and PCB board are equipped above mounting frame, input capacitor is equipped below mounting frame, the six-phase output component is T type structure, the first power device and second power device are symmetrically arranged in the middle bar of T type structure two sides and are connected with the input end of six-phase output component;Input filter is further equipped below the mounting frame, and the input filter includes lower shell, magnetic ring, upper shell, positive plate, negative plate, ground sheet and common mode capacitor, the ground sheet is fixed with lower shell together on mounting frame bottom surface, the positive plate and negative plate are arranged in laminated form and form pole plate component, the magnetic ring is nested in the rear end of pole plate component, and the magnetic ring is fixed on lower shell by upper shell, the common mode capacitor is potted on lower shell, the front end of pole plate component is electrically connected one end of common mode capacitor, and the other end of common mode capacitor is electrically connected ground sheet, and the input end of input capacitor is connected with the rear end of pole plate component.

[0007] Further, the six-phase output component includes six-phase support, six-phase copper bar and current detector, the six-phase copper bar includes three pairs of L-shaped copper strips, two L-shaped copper strips in each pair of L-shaped copper strips are symmetrically arranged to form a T shape, and the three pairs of T-shaped L-shaped copper strips are nested in parallel to form a T-shaped structure, and all the L-shaped copper strips are fixed on the six-phase support;One end of the L-shaped copper strip is provided with a copper strip input end, and the other end is provided with a copper strip output end, the current detector is arranged on the side of the crossbar of the T-shaped structure, the output end of the L-shaped copper strip passes through the current detector, and the output ends of all the L-shaped copper strips form the output end of the six-phase output component, and the input ends of all the L-shaped copper strips form the input end of the six-phase output component.

[0008] Further, among the three pairs of T-shaped L-shaped copper strips, the middle bar of the T-shaped L-shaped copper strip in the most central pair is the shortest, and the crossbar is the longest, and the middle bar of the T-shaped L-shaped copper strip in the most outer pair is the shortest, and the crossbar is the longest.

[0009] Further, the input filter has a plurality of magnetic rings, each magnetic ring has a U-shaped structure, and each two magnetic rings are connected in a downward manner to form a complete closed electromagnetic channel for passing through the pole plate component.

[0010] Further, the PCB board is arranged above the first power device and the second power device, and is electrically connected with the signal pin of the first power device and the second power device, and the input capacitor is inverted on the bottom surface of the mounting frame, and the output end of the input capacitor is electrically connected with the first power device and the second power device through the mounting frame.

[0011] Further, the first power device and the second power device are of the same structure, the first power device comprises a lower cooling channel, a power module and an upper cooling channel, the lower cooling channel and the upper cooling channel are stacked in a gap, and the first power module is clamped in the gap.

[0012] Further, the bottom surface of the lower cooling channel is a plane, the top surface has an upper boss at each end, a through hole is arranged in the upper boss and penetrates the top surface and the bottom surface, and the through hole is in communication with the inside of the lower cooling channel; the top surface of the upper cooling channel is a plane, the bottom surface has a lower boss at each end, a recess is arranged in the center of the lower boss, and a circular hole is arranged in the center of the recess and is in communication with the inside of the upper cooling channel; when the lower cooling channel and the upper cooling channel are stacked, the upper boss is embedded in the circular recess in the lower boss.

[0013] Further, staggered heat dissipation fins are welded in the middle of the lower cooling channel; staggered heat dissipation fins are welded in the middle of the upper cooling channel.

[0014] Further, the mounting frame is provided with a liquid inlet channel, a first liquid inlet, a boss, a through hole, a first liquid outlet, a second liquid inlet, a second liquid outlet and a liquid outlet channel, two bosses are arranged side by side on the mounting frame for connecting the first power device and the second power device, two through holes are arranged on the two sides of the two bosses, the first liquid inlet and the first liquid outlet are arranged at the two ends of one boss, the second liquid inlet and the second liquid outlet are arranged at the two ends of the other boss, and the first liquid outlet is in communication with the second liquid inlet; the liquid inlet channel is in communication with the first liquid inlet, the liquid outlet channel is connected to the second liquid outlet, the first liquid outlet and the first liquid inlet are in communication with the first power device, and the second liquid inlet and the second liquid outlet are in communication with the second power device.

[0015] Further, the liquid inlet channel and the liquid outlet channel are symmetrically arranged on the two sides of the mounting frame.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The six-phase output assembly of the present application adopts a T-shaped structure, and two power devices are arranged side by side and symmetrically on the two sides of the six-phase output assembly, so as to realize six-phase output of the driving controller, so that the product design has high symmetry, the current equalization and voltage equalization effects of the entire power output of the driving controller are more prominent, voltage spikes and current spikes can be well suppressed, and an input filter is arranged in front of an input capacitor, the input filter is integrated with a common-mode capacitor at the front end to perform first filtering, a magnetic ring is buckled on a positive plate and a negative plate to perform second filtering, and high-voltage current directly enters the input capacitor to perform third stable voltage filtering after passing through the two filtering processes, so as to further suppress voltage spikes and radiation interference; in summary, the structure of the six-phase output assembly and the arrangement of the input filter can suppress electromagnetic interference in two stages, so as to significantly improve the working stability of the driving controller.

[0018] 2. The six-phase output assembly of the present application comprises a six-phase support, a six-phase copper bar and a current detector, wherein the six-phase copper bar comprises three pairs of L-shaped copper strips, which are fixed in the six-phase support and arranged in parallel to form a T-shaped structure, the structure has high integration, effectively reduces the number of parts of the driving controller, reduces the assembly complexity, and ensures the current sharing and voltage sharing of the power output.

[0019] 3. The present application realizes synchronous heat dissipation in two directions of the power module through the design of the mounting frame, improves the heat dissipation efficiency and speed, realizes efficient thermal management of the whole product, and is more helpful to the thermal stability of the product itself. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present embodiment.

[0021] Figure 2 It is a structural schematic diagram of the six-phase output assembly.

[0022] Figure 3 It is a structural schematic diagram of the input filter.

[0023] Figure 4 It is a structural schematic diagram of the lower shell.

[0024] Figure 5 It is a structural schematic diagram of the upper shell.

[0025] Figure 6 It is a structural schematic diagram of the first power device.

[0026] Figure 7 It is a structural schematic diagram of the upper cooling channel.

[0027] Figure 8 It is a structural schematic diagram of the inside of the upper cooling channel.

[0028] Figure 9 It is a structural schematic diagram of the mounting frame.

[0029] Reference numerals: 1. Mounting bracket; 2. First power unit; 3. PCB board; 4. Six-phase output assembly; 5. Inlet pipe; 6. Input capacitor; 7. Input filter; 8. Second power unit; 9. Outlet pipe; 11. Inlet channel; 12. First inlet; 13. Boss; 14. Through hole; 15. Fixing post; 16. First outlet; 17. Second inlet; 18. Second outlet; 19. Outlet channel; 21. Lower cooling channel. 211. Upper boss; 211a. Through hole; 22. Power module; 23. Upper cooling channel; 231. Lower boss; 231a. Round hole; 41. Six-phase support; 42. Six-phase copper busbar; 421. L-shaped copper strip; 421a. Copper strip input terminal; 421b. Copper strip output terminal; 43. Current detector; 71. Lower shell; 72. Magnetic ring; 73. Upper shell; 74. Positive plate; 75. Negative plate; 76. Grounding piece; 77. Common mode capacitor. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0031] like Figure 1 As shown, this embodiment provides a six-phase motor drive controller for electric vehicles, including a mounting bracket 1 and a first power device 2, a second power device 8, a six-phase output component 4, a PCB board 3 disposed above the mounting bracket, an input capacitor 6 and an input filter 7 disposed below the mounting bracket 1, and an inlet pipe 5 and an outlet pipe 9 disposed on two sides of the mounting bracket 1.

[0032] like Figure 2As shown, the six-phase output assembly 4 is a T-shaped structure, and the first power device 2 and the second power device 8 are symmetrically arranged on both sides of the middle rod of the T-shaped structure and connected with the input end of the six-phase output assembly 4. The six-phase output assembly 4 specifically includes a six-phase support 41, a six-phase copper bar 42 and a current detector 43. The six-phase support 41 is arranged in the middle of the mounting rack 1 and fixed on the upper surface of the mounting rack 1, and the six-phase copper bar 42 is fixed on the six-phase support 41. Specifically, the six-phase copper bar 42 includes three pairs of L-shaped copper strips 421, and two L-shaped copper strips 421 in each pair of L-shaped copper strips 421 are symmetrically arranged to form a T shape, and the three pairs of T-shaped L-shaped copper strips 421 are arranged in parallel and nested to form a T-shaped structure, and all the L-shaped copper strips (421) are fixed on the six-phase support (41). Meanwhile, in the three pairs of T-shaped L-shaped copper strips 421, the lengths of the middle rods and the horizontal rods of the T shapes are uniformly distributed, the middle rod of the T shape of the pair of L-shaped copper strips 421 located in the center is the shortest, and the horizontal rod is the longest, and the middle rod of the T shape of the pair of L-shaped copper strips 421 located at the outermost side is the shortest, and the horizontal rod is the longest. One end of the L-shaped copper strip (421) is provided with a copper strip input end 421a, and the other end is provided with a copper strip output end 421b, and the copper strip output end 421b is further riveted with a nut. The current detector 43 is arranged on the side of the horizontal rod of the T-shaped structure, and the output end 421b of the L-shaped copper strip 421 passes through the current detector 43. All the output ends 421b of the L-shaped copper strips 421 together form the input end of the six-phase output assembly 4; and all the input ends 421a of the L-shaped copper strips 421 together form the input end of the six-phase output assembly 4. The six L-shaped copper strips 421 are spaced apart from each other by 5mm.

[0033] As shown in the drawings, Figure 3 The mounting rack 1 is further provided with an input filter 7 below. The input filter 7 includes a lower shell 71, a magnetic ring 72, an upper shell 73, a positive plate 74, a negative plate 75, a grounding sheet 76 and a common mode capacitor 77. The grounding sheet 76 and the lower shell 71 are fixed together on the bottom surface of the mounting rack 1. The positive plate 74 and the negative plate 75 are arranged in layers to form a plate assembly. The magnetic ring 72 is nested at the rear end of the plate assembly, and the magnetic ring 72 is fixed on the lower shell 71 through the upper shell 73. The common mode capacitor 77 is potted on the lower shell 71, the front end of the plate assembly is electrically connected to one end of the common mode capacitor 77, and the other end of the common mode capacitor 77 is electrically connected to the grounding sheet 76. The input end of the input capacitor 6 is connected to the rear end of the plate assembly.

[0034] Each magnetic ring 72 is in a U-shaped structure, and there are four magnetic rings 72 in total. Two U-shaped magnetic rings 72 are buckled together to form a complete closed electromagnetic channel, which is used to pass through the plate assembly to meet the filtering and suppression of the input current and meet the EMC performance of the controller.

[0035] As shown in the drawings, Figure 4 and Figure 5As shown, the left side of the lower shell 71 has two small rectangular slots for pouring the common mode capacitor 77, and the right side has a large square slot for placing the lower two magnetic rings 72. The bottom of the upper shell 73 has a rectangular slot for placing the upper two magnetic rings 72, and the bottom surface of the slot has four small cylindrical protrusions for pressing the magnetic rings 72 and ensuring that the upper magnetic rings 72 and the lower magnetic rings 72 are in contact and do not separate.

[0036] As shown in Figure 6 and Figure 7 The first power device 2 and the second power device 8 are identical and are fixed on the mounting rack 1. Taking the first power device 2 as an example, the power device includes a lower cooling channel 21, a power module 22, and an upper cooling channel 23. The lower cooling channel 21 and the upper cooling channel 23 are stacked together to clamp the power module 22 in the gap in the middle. The bottom surface of the lower cooling channel 21 is a flat surface, and the top surface has an upper boss 211 at each end. The upper boss 211 has a through hole 211a that penetrates the top surface and the bottom surface, and the through hole 211a simultaneously communicates with the inside of the lower cooling channel 21. The top surface of the cooling channel 23 is a flat surface, and the bottom surface has a lower boss 231 at each end. The lower boss 231 has a recess in the center, and the center of the recess has a circular hole 231a that communicates with the inside of the upper cooling channel 23; when the lower cooling channel 21 and the upper cooling channel 23 are stacked, the upper boss 211 is embedded in the circular recess in the lower boss 231, so that the circular hole 231a and the through hole 211a are in communication with each other and remain sealed. As shown in Figure 8 The lower cooling channel 21 has staggered heat dissipation fins welded in the middle; the upper cooling channel 23 also has staggered heat dissipation fins welded in the middle.

[0037] As shown in Figure 9 The mounting rack 1 is provided with a liquid inlet channel 11, a first liquid inlet 12, a boss 13, a through hole 14, a fixing column 15, a first liquid outlet 16, a second liquid inlet 17, a second liquid outlet 18, and a liquid outlet channel 19. Two bosses 13 are arranged side by side on the mounting rack 1 for connecting the first power device 2 and the second power device 8. Two through holes 14 are distributed on both sides of the two bosses 13. One boss 13 is provided with a first liquid inlet 12 and a first liquid outlet 16 at both ends, and the other boss 13 is provided with a second liquid inlet 17 and a second liquid outlet 18 at both ends. The first liquid outlet 16 communicates with the second liquid inlet 17. The liquid inlet channel 11 communicates with the first liquid inlet 12, and the liquid outlet channel 19 communicates with the second liquid outlet 18. The first liquid outlet 16 and the first liquid inlet 12 communicate with the through hole 211a of the lower cooling channel 21 in the first power device 2; the second liquid inlet 17 and the second liquid outlet 18 communicate with the through hole 211a of the lower cooling channel 21 in the second power device 8.

[0038] In actual work process, the cooling liquid first enters the inlet channel 11 from the inlet pipe 5, and flows into the upper cooling channel 23 and the lower cooling channel 21 of the first power device 2 from the first inlet 12, and is divided into two parallel and parallel cooling liquids, to realize the cooling and heat dissipation of the two surfaces of the power module 22 in the first power device 2. Then the cooling liquid is converged at the end into the first outlet 16, and flows into the second inlet 17 through a communicating channel. Then the cooling liquid enters the upper cooling channel 23 and the lower cooling channel 21 of the second cooling device 8 from the second inlet 17, and is divided into two parallel and parallel cooling liquids, to realize the cooling and heat dissipation of the two surfaces of the power module 22 in the second power device 8. Then the cooling liquid is converged at the other end into the second outlet 18, and flows into the outlet channel 19, and finally flows out from the outlet pipe 9, to complete the heat dissipation and cooling of the whole six-phase motor drive controller.

[0039] The PCB board 3 is arranged above the first power device 2 and the second power device 8, and is electrically connected with the signal pins of the first power device 2 and the second power device 8. The input capacitor 6 is inverted on the bottom surface of the mounting frame 1, and the output end of the input capacitor 6 is electrically connected with the power module 22 in the first power device 2 and the second power device 8 through the mounting frame 1.

[0040] The specific assembly process of the motor controller is as follows:

[0041] First, assemble the corresponding components:

[0042] 1. Assemble the input filter 7: first fill the common mode capacitor 77 into the rectangular slot on the left side of the lower shell 71, and seal with glue, then install the ground sheet 76 on the lower shell 71, and clamp and weld one end of the common mode capacitor 77 with the ground sheet 76, then stack the positive plate 74 and the negative plate 75, and buckle the two pairs of magnetic rings 72 on the positive plate 74 and the negative plate 75, then fill them into the square slot on the right side of the lower shell 71, and finally press the upper shell 73 on the upper magnetic ring 72 and fix it with the lower shell 71, to complete the assembly of the input filter 7;

[0043] 2. Assemble the first power device 2 and the second power device 8: first place the lower cooling channel 21 horizontally, and apply thermal grease on the upper side, then place the three power modules 22 side by side on it, then apply thermal grease on the lower side of the upper cooling channel 23 and press it on the upper side of the power module 22, and seal it with an O-ring between the lower cooling channel 21, to complete the assembly of the first power device 2, and repeat the assembly of the second power device 8.

[0044] 3, Assemble six-phase output assembly 4: first place six-phase support 41 horizontally, then place six-phase copper bar 42 in the L-shaped groove of six-phase support 71, then put current detector 43 on the output end of six-phase copper bar 42 and pass through the center hole of current detector 43.

[0045] Then complete the assembly of the drive controller:

[0046] First, install input filter 7 on the bottom surface of mounting frame 1 and fix it with bolts, then install input capacitor 6 on the bottom surface of mounting frame 1, the output end of input capacitor 6 passes through the hole on the top of mounting frame 1 and enters the top, the input end of input capacitor 6 is electrically connected with the output end of positive plate 74 and negative plate 75 of input filter 7 and is fixed on lower shell 71 with bolts; then fix six-phase output assembly 4 on the top of mounting frame 1 with bolts, fix current detector 43 on the top of mounting frame 1 with bolts, then fix first power device 2 and second power device 8 on the boss 13 on the top of mounting frame 1 respectively, fix the input end of power module 22 on the input end of six-phase copper bar 42 with bolts, and fix the six-phase output end of power module 22 on six-phase support 41 with bolts; then fix PCB board 3 on the cylindrical fixing column 15 of mounting frame 1 with bolts, and fix the signal pin of power module 22 on PCB board 3 with soldering process; finally, fix liquid inlet pipe 5 and liquid outlet pipe 9 on liquid inlet channel 11 and liquid outlet channel 19 on both sides of mounting frame 1 respectively, thus completing the assembly of the entire drive controller.

[0047] The preferred embodiments of the application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the prior art according to the concept of the application shall be within the protection scope determined by the claims.

Claims

1. A six-phase motor drive controller for an electric vehicle, characterized by, The utility model provides a kind of power supply device, including mounting frame (1), first power device (2) is equipped with above mounting frame (1), second power device (8), six-phase output assembly (4) and PCB board (3), input capacitor (6) is equipped with below mounting frame (1), characterized in that, the six-phase output assembly (4) is T type structure, the first power device (2) and second power device (8) are symmetrically arranged in the middle pole of T type structure two sides and are connected with the input end of six-phase output assembly (4);Input filter (7) is further equipped with below mounting frame (1), and the input filter (7) includes lower shell (71), magnetic ring (72), upper shell (73), positive plate (74), negative plate (75), ground sheet (76) and common mode capacitor (77), the ground sheet (76) is fixed with lower shell (71) together on mounting frame (1) bottom surface, the positive plate (74) and negative plate (75) are arranged in laminated form and form pole assembly, the magnetic ring (72) is nested in the rear end of pole assembly, and the magnetic ring (72) is fixed on lower shell (71) by upper shell (73), the common mode capacitor (77) is potted on lower shell (71), the front end of pole assembly is electrically connected one end of common mode capacitor (77), the other end of common mode capacitor (77) is electrically connected ground sheet (76), the input end of input capacitor (6) is connected with the rear end of pole assembly; The six-phase output assembly (4) includes six-phase support (41), six-phase copper bar (42) and current detector (43), the six-phase copper bar (42) includes three pairs of L-shaped copper strips (421), two L-shaped copper strips (421) in each pair of L-shaped copper strips (421) are symmetrically arranged to form a T shape, and the three pairs of T-shaped L-shaped copper strips (421) are nested in parallel to form a T-shaped structure, and all the L-shaped copper strips (421) are fixed on the six-phase support (41); one end of the L-shaped copper strip (421) is provided with a copper strip input end (421a), and the other end is provided with a copper strip output end (421b); the current detector (43) is arranged on the side of the horizontal rod of the T-shaped structure, the output end (421b) of the L-shaped copper strip (421) passes through the current detector (43), the output ends (421b) of all the L-shaped copper strips (421) collectively form the output end of the six-phase output assembly (4), and the input ends (421a) of all the L-shaped copper strips (421) collectively form the input end of the six-phase output assembly (4); the input filter (7) has a plurality of magnetic rings (72), each magnetic ring (72) has a U-shaped structure, and every two magnetic rings (72) are connected in a top-down manner to form a complete closed electromagnetic channel for passing through the pole assembly.

2. The six-phase motor drive controller for electric vehicles of claim 1, wherein, Among the three pairs of T-shaped L-shaped copper strips (421), the middle rod of the T-shaped L-shaped copper strip (421) in the most central pair is the shortest, and the horizontal rod is the longest, and the middle rod of the T-shaped L-shaped copper strip (421) in the most outer pair is the shortest, and the horizontal rod is the longest.

3. The six-phase motor drive controller for electric vehicles of claim 1, wherein, The PCB (3) is arranged above the first power device (2) and the second power device (8) and is electrically connected with signal pins of the first power device (2) and the second power device (8), the input capacitor (6) is inverted on the bottom surface of the mounting rack (1), and the output end of the input capacitor (6) is electrically connected with the first power device (2) and the second power device (8) through the mounting rack (1).

4. The six-phase motor drive controller for electric vehicles of claim 1, wherein, The first power device (2) and the second power device (8) are of the same structure, the first power device (2) comprises a lower cooling channel (21), a power module (22) and an upper cooling channel (23), the lower cooling channel (21) and the upper cooling channel (23) are arranged in a gap, and the first power module (22) is clamped in the gap.

5. The six-phase motor drive controller for electric vehicles of claim 4, wherein, The bottom surface of the lower cooling channel (21) is a plane, the top surface of the lower cooling channel (21) has an upper boss (211) at each end, the upper boss (211) is provided with a through hole (211a) penetrating the top surface and the bottom surface, and the through hole (211a) is in communication with the inside of the lower cooling channel (21); the top surface of the upper cooling channel (23) is a plane, the bottom surface of the upper cooling channel (23) has a lower boss (231) at each end, the lower boss (231) has a recess in the center, and the recess is provided with a circular hole (231a) in the center and in communication with the inside of the upper cooling channel (23); when the lower cooling channel (21) and the upper cooling channel (23) are arranged in a stack, the upper boss (211) is embedded in the circular recess in the lower boss (231).

6. The six-phase motor drive controller for electric vehicles of claim 4, wherein, Interlaced heat dissipation fins are welded in the middle of the lower cooling channel (21); interlaced heat dissipation fins are welded in the middle of the upper cooling channel (23).

7. The six-phase motor drive controller for electric vehicles of claim 1, wherein, The mounting rack (1) is provided with an inlet channel (11), a first inlet (12), a boss (13), a through hole (14), a first outlet (16), a second inlet (17), a second outlet (18) and an outlet channel (19), two bosses (13) are arranged side by side on the mounting rack (1) and used for connecting the first power device (2) and the second power device (8), two through holes (14) are arranged on the two sides of the two bosses (13), the first inlet (12) and the first outlet (16) are arranged at the two ends of one boss (13), the second inlet (17) and the second outlet (18) are arranged at the two ends of the other boss (13), and the first outlet (16) is in communication with the second inlet (17); the inlet channel (11) is in communication with the first inlet (12), the outlet channel (19) is connected with the second outlet (18), the first outlet (16) and the first inlet (12) are in communication with the first power device (2), and the second inlet (17) and the second outlet (18) are in communication with the second power device (8).

8. The six-phase motor drive controller for electric vehicles of claim 7, wherein, The inlet channel (11) and the outlet channel (19) are symmetrically arranged on the two sides of the mounting rack (1).

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