External electromagnetic pulse attack shielding system for motor controller of electric vehicle

Abstract

A shielding system for an electric vehicle motor controller to shield external electromagnetic pulse attack. Signal lines, control line protectors, first power surge protectors, second power surge protectors and third power surge protectors installed inside the outer shield body of the motor controller absorb the current induced by the external electromagnetic field on the shield, signal line, first power line and second power line, coolant inlet and coolant outlet, preventing the remaining current from inducing a new strong electromagnetic field to attack the motor controller. The cooling liquid cooling system may keep the temperature of the motor controller of the electric vehicle not change when running under heavy load. The above technology may ensure the motor controller of the electric vehicle running according to the design requirements.

Claims

1. A shielding system of electric vehicle motor controller to shield external electromagnetic pulse attack comprises a first helical conduit, a third helical conduit, a fifth helical conduit, an eighth helical conduit and a tenth helical conduit mounted outside the shield body to block external electromagnetic field from entering directly into the shield, and the signal line and control line protector, the first power surge protector, the second power surge protector and the third power surge protector installed inside the shield together with the shield body form a whole shield body to shield external electromagnetic field;

2. A shielding system of electric vehicle motor controller to shield external electromagnetic pulse attack according claim 1, the system comprising: a first bracket 21 is fixed on the inner surface of the shield body 16, and the signal line and control circuit protector 22 are fixed on the first bracket 21; the second bracket 27 is fixed on the inner surface of the shield body 16, and the first power surge protector 28 is fixed on the second bracket 27; the third bracket 34 is fixed on the inner surface of the shield body 16, and the second power surge protector 36 is fixed on the third bracket 34; the fourth bracket 39 is fixed on the inner surface of the shield body 16, and the third power surge protector 40 is fixed on the fourth bracket 39; the motor controller 60 is mounted and fixed to the inside of the shield 16 through the fifth bracket 61 and the sixth bracket 64; the first shield conduit 19, the second shield conduit 25, and the third shield conduit 33 (all bent at right angle from both ends of the conductive magnetically permeable metal) are mounted on the shield 16 by the way of soldering; a shield body 16 comprising a lower housing 71 and an upper cover 72 is a rectangular box with no right angle; the upper cover 72 is fixed to the lower housing 71 by the screw 75; the corners of the shield 16 are all in the shape of a circular arc, and the shield 16 is fixed to the electric vehicle by the bracket 74; a first spiral conduit 77 and a second spiral conduit 80 are respectively mounted at both ends of the first shielded conduit 19 bent at right angle at both ends, and the tenth interface 78 of the first spiral conduit 77 is connected to the seventh interface 51 of the first shielding duct 19; the eleventh interface 81 of the second spiral duct 80 is connected to the eighth interface 52 of the first shielding duct 19; the first wire 49 passes through the first signal line outlet 110 of the second spiral conduit 80, and the tenth interface 82 of the second spiral conduit 80 is closely connected to the first interface 83 of the upper portion of the signal line and control line protector 22. On the outside of the shield 16, the signal line 20 enters into the first helix catheter 77 from the ninth connector 79 of the first helix catheter 77, and then is connected to the second conductor 76 of the signal line and control line protector 22 at the connection point 18; the first connection point 18 is at an intermediate position between the seventh interface 51 and the eighth interface 52; the first wire 49 of the signal line and control line protector 22 is connected to the signal line interface 50 of the motor controller 60, and the signal line 20 is connected in series with the signal line and control line protector 22; the first grounding wire 23 of the signal line and control line protector 22 is the protective ground line PE of the signal line and control line protector 22, and the first grounding wire 23 is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16. a first power line 29 is connected in parallel with the first power surge protector 28; the fifteenth interface 86 of the third spiral conduit 84 is connected to the third interface 56 of the second shield conduit 25; the sixteenth interface 88 of the fourth spiral conduit 87 is connected to the fourth interface 57 of the second shield conduit 25; the seventeenth port 89 of the fourth spiral conduit 87 is tightly connected to the upper second port 90 of the first power surge protector 28; on the outside of the shield 16, the first power line 29 enters the third spiral conduit 84 from the fourteenth interface 85 of the third helical conduit 84, and enters the second shielded conduit 25 through the fifteenth interface 86 and the third interface 56 of the second shielded conduit 25; after entering the second shielded conduit 25, the first power line 29 enters the interior of the shield 16 and is connected in parallel with the first power surge protector 28 at the second connection point 26, and the second connection point 26 is in the middle of the third interface 56 and the fourth interface 57. The first power line 29 is composed of two wires, and is divided into two lines inside the shield body 16 after passing through the second shielding conduit 25, the fourth interface 57, the fourth spiral conduit 87 and the first power line outlet 46 (the first line of the two lines is a positive line connected to the positive power source interface 47 of the motor controller 60; the second line is a negative line and is connected to the negative power supply interface 48 of the motor controller 60; the second grounding conductor 24 of the first power surge protector 28 is the protective grounding wire PE of the first power surge protector 28 and is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16; a second power line 35 is connected in parallel with the second power surge protector 36, and the second power line 35 comprises a phase line L, a neutral line N, and a protective ground line G; the twentieth interface 93 of the fifth spiral conduit 91 is connected to the fifth interface 58 of the third shield conduit 33; the twenty-first interface 94 of the sixth spiral conduit 95 is connected to the sixth interface 59 of the third shield conduit 33; the twenty-second interface 96 of the sixth spiral conduit 95 is tightly connected to the upper twenty-third interface 97 of the second power surge protector 36; the second power wire 35 enters the fifth spiral conduit 91 from the eighteenth interface 92 of the fifth spiral conduit 91, and then enters the third shield conduit 33 from the fourth interface 58; after the second power wire 35 enters the third shielding conduit 33, the second power wire 35 is connected in parallel with the second power surge protector 36 to the third connection point 32 before going into the shield 16; the third connection point 32 is at an intermediate position between the fifth interface 58 and the sixth interface 59, and the second power supply line 35 passes through the third shielding conduit 33 and the sixth spiral conduit 95, and goes through the second power supply line's outlet 42 of the third shielding conduit 33; then the second power supply line 35 is separated into three lines: the phase line L is connected to the first power port 43 of the motor controller 60, and the neutral line N is connected to the second power port 44 of the motor controller 60; the protective ground wire G is connected to the third power interface 45 of the motor controller 60; the third ground wire 31 of the motor controller 60 is the protective ground wire PE of the motor controller 60 and is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16; a coolant outlet pipe 17 is first connected to the twenty-fourth port 98 of the seventh spiral conduit 99, and the fifth interface 100 of the twentieth of the seventh spiral conduit 99 is connected to the nineteenth interface 101 of the eighth spiral conduit 102 outside the shield 16 through the coolant outlet 63 of the shield 16; the first shield mesh 67 is mounted between the twenty-fifth interface 100 and the nineteenth interface 101 of the shield 16; the twenty-fifth interface 100, the nineteenth interface 101 and the first shielding net 67 are welded together; the coolant inlet pipe 30 is first connected to the twenty-seventh interface 104 of the ninth spiral conduit 105, and the twenty-eighth interface 106 of the ninth spiral conduit 105 is connected to the twenty-ninth interface 107 of the tenth spiral conduit 108 through the coolant inlet 66 of the shield 16; the twenty-eighth interface 106, the twenty-ninth interface 107 and the second shield mesh 68 are welded together; after the first shielding net 67 and the second shielding net 68 and the shielding body 16 form a leak proof shielding body, the third power surge protector 40 may absorb the current induced by the external electromagnetic field in the cooling liquid;

3. A shielding system of electric vehicle motor controller to shield external electromagnetic pulse attack according claim 1, the system comprising: a first bracket 21 is fixed on the inner surface of the shield body 16, and the signal line and control circuit protector 22 are fixed on the first bracket 21; the second bracket 27 is fixed on the inner surface of the shield body 16, and the first power surge protector 28 is fixed on the second bracket 27; the third bracket 34 is fixed on the inner surface of the shield body 16, and the second power surge protector 36 is fixed on the third bracket 34; the fourth bracket 39 is fixed on the inner surface of the shield body 16, and the third power surge protector 40 is fixed on the fourth bracket 39; the motor controller 60 is mounted and fixed to the inside of the shield 16 through the fifth bracket 61 and the sixth bracket 64; the first shield duct 19, the second shield duct 25, and the third shield duct 33 (all bent at right angle from both ends of the conductive magnetically permeable metal) are mounted on the shield 16 by the way of soldering. a shield body 16 comprising a lower housing 71 and an upper cover 72 is a rectangular box with no right angle; the upper cover 72 is fixed to the lower housing 71 by the screw 75; the corners of the shield 16 are all in the shape of a circular arc, and the shield 16 is fixed to the electric vehicle by the bracket 74. a first spiral conduit 77 and a second spiral conduit 80 are respectively mounted at both ends of the first shielded conduit 19 bent at right angle at both ends, and the tenth interface 78 of the first spiral conduit 77 is connected to the seventh interface 51 of the first shielding duct 19; the eleventh interface 81 of the second spiral duct 80 is connected to the eighth interface 52 of the first shielding duct 19; the first wire 49 passes through the first signal line outlet 110 of the second spiral conduit 80, and the tenth interface 82 of the second spiral conduit 80 is closely connected to the first interface 83 of the upper portion of the signal line and control line protector 22; on the outside of the shield 16, the signal line 20 enters into the first helix catheter 77 from the ninth connector 79 of the first helix catheter 77, and then is connected to the second conductor 76 of the signal line and control line protector 22 at the connection point 18; the first connection point 18 is at an intermediate position between the seventh interface 51 and the eighth interface 52; the first wire 49 of the signal line and control line protector 22 is connected to the signal line interface 50 of the motor controller 60, and the signal line 20 is connected in series with the signal line and control line protector 22; the first grounding wire 23 of the signal line and control line protector 22 is the protective ground line PE of the signal line and control line protector 22, and the first grounding wire 23 is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16. a first power line 29 is connected in parallel with the first power surge protector 28; the fifteenth interface 86 of the third spiral conduit 84 is connected to the third interface 56 of the second shield conduit 25; the sixteenth interface 88 of the fourth spiral conduit 87 is connected to the fourth interface 57 of the second shield conduit 25; the seventeenth port 89 of the fourth spiral conduit 87 is tightly connected to the upper second port 90 of the first power surge protector 28; on the outside of the shield 16, the first power line 29 enters the third spiral conduit 84 from the fourteenth interface 85 of the third helical conduit 84, and enters the second shielded conduit 25 through the fifteenth interface 86 and the third interface 56 of the second shielded conduit 25; after entering the second shielded conduit 25, the first power line 29 enters the interior of the shield 16 and is connected in parallel with the first power surge protector 28 at the second connection point 26, and the second connection point 26 is in the middle of the third interface 56 and the fourth interface 57; the first power line 29 is composed of two wires, and is divided into two lines inside the shield body 16 after passing through the second shielding conduit 25, the fourth interface 57, the fourth spiral conduit 87 and the first power line outlet 46 (the first line of the two lines is a positive line connected to the positive power source interface 47 of the motor controller 60; the second line is a negative line and is connected to the negative power supply interface 48 of the motor controller 60; the second grounding conductor 24 of the first power surge protector 28 is the protective grounding wire PE of the first power surge protector 28 and is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16; a second power line 35 is connected in parallel with the second power surge protector 36, and the second power line 35 comprises a phase line L, a neutral line N, and a protective ground line G; the twentieth interface 93 of the fifth spiral conduit 91 is connected to the fifth interface 58 of the third shield conduit 33; the twenty-first interface 94 of the sixth spiral conduit 95 is connected to the sixth interface 59 of the third shield conduit 33; the twenty-second interface 96 of the sixth spiral conduit 95 is tightly connected to the upper twenty-third interface 97 of the second power surge protector 36; the second power wire 35 enters the fifth spiral conduit 91 from the eighteenth interface 92 of the fifth spiral conduit 91, and then enters the third shield conduit 33 from the fourth interface 58; after the second power wire 35 enters the third shielding conduit 33, the second power wire 35 is connected in parallel with the second power surge protector 36 to the third connection point 32 before going into the shield 16; the third connection point 32 is at an intermediate position between the fifth interface 58 and the sixth interface 59, and the second power supply line 35 passes through the third shielding conduit 33 and the sixth spiral conduit 95, and goes through the second power supply line's outlet 42 of the third shielding conduit 33; then the second power supply line 35 is separated into three lines: the phase line L is connected to the first power port 43 of the motor controller 60, and the neutral line N is connected to the second power port 44 of the motor controller 60; the protective ground wire G is connected to the third power interface 45 of the motor controller 60; the third ground wire 31 of the motor controller 60 is the protective ground wire PE of the motor controller 60 and is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16; a coolant outlet pipe 17 is first connected to the twenty-fourth port 98 of the seventh spiral conduit 99, and the fifth interface 100 of the twentieth of the seventh spiral conduit 99 is connected to the nineteenth interface 101 of the eighth spiral conduit 102 outside the shield 16 through the coolant outlet 63 of the shield 16. The first shield mesh 67 is mounted between the twenty-fifth interface 100 and the nineteenth interface 101 of the shield 16. The twenty-fifth interface 100, the nineteenth interface 101 and the first shielding net 67 are welded together; the coolant inlet pipe 30 is first connected to the twenty-seventh interface 104 of the ninth spiral conduit 105, and the twenty-eighth interface 106 of the ninth spiral conduit 105 is connected to the twenty-ninth interface 107 of the tenth spiral conduit 108 through the coolant inlet 66 of the shield 16; the twenty-eighth interface 106, the twenty-ninth interface 107 and the second shield mesh 68 are welded together; after the first shielding net 67 and the second shielding net 68 and the shielding body 16 form a leak proof shielding body, the third power surge protector 40 may absorb the current induced by the external electromagnetic field in the cooling liquid; a third power surge protector 40 can absorb the large current induced on the shielding plate 14 of the motor controller 60 after the first wire 37 of the third power surge protector 40 is connected to the shield slab 14 of the motor controller 60; after the second wire 38 of the third power surge protector 40 is connected to the shield 16, the third power surge protector 40 can absorb the large current induced on the shield 16 by the external electromagnetic field; the fourth grounding conductor 41 of the third power surge protector 40 is a protective grounding wire PE, and is connected to the inner surface of the shielding body 16 to lead the energy the third power supply surge protector 40 absorbed to the shielding body 16; a motor controller comprises a radiator 1, a plurality of power modules 2, a capacitor module 3 and a DC composite copper bar 4; a cooling liquid passage is opened on the radiator 1, and a cooling a coolant inlet 62 and a coolant outlet 63 (on the radiator 1) are connected to the liquid passage; a plurality of power modules 2 and capacitor module 3 are respectively mounted on the upper surface and the lower surface of the radiator 1, both radiating heat through the radiator 1; a positive power input interface 47 and a negative power input interface 48 are installed on the one end of the DC composite copper bar 4, and the power module 2 and the capacitor module 3 are connected to the other end electrically; the output end of the power module 2 outputs an AC power source through the first output power interface 43, the second output power interface 44 and the third output power interface; the input end of the power module 2 and the DC composite copper bar 4 are electrically connected through the input pole piece 8, inputting direct current from the DC composite copper bar 4 to each power module 2; one end of the output copper bar 9 is connected to the output end of the power module 2, and the current sensor 10 is mounted on some or all of the output copper bar 9 and the DC composite copper bar 4; all the output copper bar 9 are provided with current sensor 10; a control circuit board 11 and a driving circuit board 12 are mounted on the upper surface of the power module 2, and a shielding board 14 is disposed between the control circuit board 11 and the upper surface of the power module 2; the control circuit board 11 is driven by the driving circuit board 12; an adapter circuit board 13 is also mounted on the upper surface of the power module 2, and the adapter circuit board 13 is electrically connected to the control circuit board 11, converting and inputting the received signal to the control circuit board 11.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a narrow structural view of this embodiment;

[0031] FIG. 2 is a plan view of the shield of this embodiment;

[0032] FIG. 3 is a diagram showing the connection of the signal line inlet and outlet and the internal circuit of this embodiment;

[0033] FIG. 4 and FIG. 5 are connection diagrams of the power cord inlet and outlet conduits and internal wiring of this embodiment;

[0034] FIG. 6 and FIG. 7 are connection diagrams of a coolant inlet and a outlet conduit of this embodiment;

[0035] FIG. 8 and FIG. 9 are structural views of a shield mesh of this embodiment;

[0036] FIG. 10 is a perspective view of the motor controller of this embodiment;

[0037] FIG. 11 is a connection diagram of a power surge protector and a power line of this embodiment;

[0038] FIG. 12 is a schematic exploded view of the core components of the motor controller of this embodiment.

SPECIFIC IMPLEMENTATION PLAN

[0039] FIG. 1 shows the first bracket 21 is fixed on the inner surface of the shield body 16, and the signal line and control circuit protector 22 are fixed on the first bracket 21; the second bracket 27 is fixed on the inner surface of the shield body 16, and the first power surge protector 28 is fixed on the second bracket 27; the third bracket 34 is fixed on the inner surface of the shield body 16, and the second power surge protector 36 is fixed on the third bracket 34; the fourth bracket 39 is fixed on the inner surface of the shield body 16, and the third power surge protector 40 is fixed on the fourth bracket 39; the motor controller 60 is mounted and fixed to the inside of the shield 16 through the fifth bracket 61 and the sixth bracket 64. The first shield duct 19, the second shield duct 25, and the third shield duct 33 (all bent at right angle from both ends of the conductive magnetically permeable metal) are mounted on the shield 16 by the way of soldering.

[0040] FIGS. 1-2 shows the shield body 16 comprising a lower housing 71 and an upper cover 72 is a rectangular box with no right angle; the upper cover 72 is fixed to the lower housing 71 by the screw 75; the corners of the shield 16 are all in the shape of a circular arc, and the shield 16 is fixed to the electric vehicle by the bracket 74.

[0041] FIG. 1 and FIG. 3 show the first spiral conduit 77 and the second spiral conduit 80 are respectively mounted at both ends of the first shielded conduit 19 bent at right angle at both ends, and the tenth interface 78 of the first spiral conduit 77 is connected to the seventh interface 51 of the first shielding duct 19; the eleventh interface 81 of the second spiral duct 80 is connected to the eighth interface 52 of the first shielding duct 19. The first wire 49 passes through the first signal line outlet 110 of the second spiral conduit 80, and the tenth interface 82 of the second spiral conduit 80 is closely connected to the first interface 83 of the upper portion of the signal line and control line protector 22. On the outside of the shield 16, the signal line 20 enters into the first helix catheter 77 from the ninth connector 79 of the first helix catheter 77, and then is connected to the second conductor 76 of the signal line and control line protector 22 at the connection point 18. The first connection point 18 is at an intermediate position between the seventh interface 51 and the eighth interface 52; the first wire 49 of the signal line and control line protector 22 is connected to the signal line interface 50 of the motor controller 60, and the signal line 20 is connected in series with the signal line and control line protector 22; the first grounding wire 23 of the signal line and control line protector 22 is the protective ground line PE of the signal line and control line protector 22, and the first grounding wire 23 is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16.

[0042] FIG. 4, FIG. 11, and FIG. 1 show the first power line 29 is connected in parallel with the first power surge protector 28. The fifteenth interface 86 of the third spiral conduit 84 is connected to the third interface 56 of the second shield conduit 25; the sixteenth interface 88 of the fourth spiral conduit 87 is connected to the fourth interface 57 of the second shield conduit 25. The seventeenth port 89 of the fourth spiral conduit 87 is tightly connected to the upper second port 90 of the first power surge protector 28. On the outside of the shield 16, the first power line 29 enters the third spiral conduit 84 from the fourteenth interface 85 of the third helical conduit 84, and enters the second shielded conduit 25 through the fifteenth interface 86 and the third interface 56 of the second shielded conduit 25; after entering the second shielded conduit 25, the first power line 29 enters the interior of the shield 16 and is connected in parallel with the first power surge protector 28 at the second connection point 26, and the second connection point 26 is in the middle of the third interface 56 and the fourth interface 57. The first power line 29 is composed of two wires, and is divided into two lines inside the shield body 16 after passing through the second shielding conduit 25, the fourth interface 57, the fourth spiral conduit 87 and the first power line outlet 46 (the first line of the two lines is a positive line connected to the positive power source interface 47 of the motor controller 60; the second line is a negative line and is connected to the negative power supply interface 48 of the motor controller 60. The second grounding conductor 24 of the first power surge protector 28 is the protective grounding wire PE of the first power surge protector 28 and is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16.

[0043] FIG. 5, FIG. 11, and FIG. 1 show the second power line 35 is connected in parallel with the second power surge protector 36, and the second power line 35 comprises a phase line L, a neutral line N, and a protective ground line G. The twentieth interface 93 of the fifth spiral conduit 91 is connected to the fifth interface 58 of the third shield conduit 33; the twenty-first interface 94 of the sixth spiral conduit 95 is connected to the sixth interface 59 of the third shield conduit 33. The twenty-second interface 96 of the sixth spiral conduit 95 is tightly connected to the upper twenty-third interface 97 of the second power surge protector 36. The second power wire 35 enters the fifth spiral conduit 91 from the eighteenth interface 92 of the fifth spiral conduit 91, and then enters the third shield conduit 33 from the fourth interface 58; after the second power wire 35 enters the third shielding conduit 33, the second power wire 35 is connected in parallel with the second power surge protector 36 to the third connection point 32 before going into the shield 16. The third connection point 32 is at an intermediate position between the fifth interface 58 and the sixth interface 59, and the second power supply line 35 passes through the third shielding conduit 33 and the sixth spiral conduit 95, and goes through the second power supply line's outlet 42 of the third shielding conduit 33. Then the second power supply line 35 is separated into three lines: the phase line L is connected to the first power port 43 of the motor controller 60, and the neutral line N is connected to the second power port 44 of the motor controller 60; the protective ground wire G is connected to the third power interface 45 of the motor controller 60. The third ground wire 31 of the motor controller 60 is the protective ground wire PE of the motor controller 60 and is connected to the inner surface of the shield 16 to dissipate the absorbed energy in the shield 16.

[0044] FIGS. 6-9 and FIG. 1, the coolant outlet pipe 17 is first connected to the twenty-fourth port 98 of the seventh spiral conduit 99, and the fifth interface 100 of the twentieth of the seventh spiral conduit 99 is connected to the nineteenth interface 101 of the eighth spiral conduit 102 outside the shield 16 through the coolant outlet 63 of the shield 16. The first shield mesh 67 is mounted between the twenty-fifth interface 100 and the nineteenth interface 101 of the shield 16. The twenty-fifth interface 100, the nineteenth interface 101 and the first shielding net 67 are welded together,

[0045] The coolant inlet pipe 30 is first connected to the twenty-seventh interface 104 of the ninth spiral conduit 105, and the twenty-eighth interface 106 of the ninth spiral conduit 105 is connected to the twenty-ninth interface 107 of the tenth spiral conduit 108 through the coolant inlet 66 of the shield 16. And the twenty-eighth interface 106, the twenty-ninth interface 107 and the second shield mesh 68 are welded together. After the first shielding net 67 and the second shielding net 68 and the shielding body 16 form a leak proof shielding body, the third power surge protector 40 may absorb the current induced by the external electromagnetic field in the cooling liquid.

[0046] FIG. 11 and FIG. 1 show that the third power surge protector 40 can absorb the large current induced on the shielding plate 14 of the motor controller 60 after the first wire 37 of the third power surge protector 40 is connected to the shield slab 14 of the motor controller 60. After the second wire 38 of the third power surge protector 40 is connected to the shield 16, the third power surge protector 40 can absorb the large current induced on the shield 16 by the external electromagnetic field. The fourth grounding conductor 41 of the third power surge protector 40 is a protective grounding wire PE, and is connected to the inner surface of the shielding body 16 to lead the energy the third power supply surge protector 40 absorbed to the shielding body 16.

[0047] FIG. 10, FIG. 12 and FIG. 1 show that the motor controller comprises a radiator 1, a plurality of power modules 2, a capacitor module 3 and a DC composite copper bar 4. A cooling liquid passage is opened on the radiator 1, and a cooling a coolant inlet 62 and a coolant outlet 63 (on the radiator 1) are connected to the liquid passage. A plurality of power modules 2 and capacitor module 3 are respectively mounted on the upper surface and the lower surface of the radiator 1, both radiating heat through the radiator 1. A positive power input interface 47 and a negative power input interface 48 are installed on the one end of the DC composite copper bar 4, and the power module 2 and the capacitor module 3 are connected to the other end electrically. The output end of the power module 2 outputs an AC power source through the first output power interface 43, the second output power interface 44 and the third output power interface. And the input end of the power module 2 and the DC composite copper bar 4 are electrically connected through the input pole piece 8, inputting direct current from the DC composite copper bar 4 to each power module 2. One end of the output copper bar 9 is connected to the output end of the power module 2, and the current sensor 10 is mounted on some or all of the output copper bar 9 and the DC composite copper bar 4. And all the output copper bar 9 are provided with current sensor 10. A control circuit board 11 and a driving circuit board 12 are mounted on the upper surface of the power module 2, and a shielding board 14 is disposed between the control circuit board 11 and the upper surface of the power module 2. The control circuit board 11 is driven by the driving circuit board 12. An adapter circuit board 13 is also mounted on the upper surface of the power module 2, and the adapter circuit board 13 is electrically connected to the control circuit board 11, converting and inputting the received signal to the control circuit board 11.

[0048] The working principle of the shielding system of the electric vehicle motor controller: a powerful electromagnetic field generated externally induces a current on the signal line 20, and the signal line and the control line protector 22 absorb the current induced by the signal line 20, preventing the large current from entering the shield 16 through the first shielded conduit 19 along the signal line 20.

[0049] The first power surge protector 28 absorbs the current induced by the external strong electromagnetic field on the first power line 29 to prevent the current from penetrating the shield 16 to form a new strong electromagnetic field.

[0050] The second power surge protector 36 absorbs the current induced by the external strong electromagnetic field on the second power line 35 to prevent the current from penetrating the shield 16 to form a new strong electromagnetic field.

[0051] The third power surge protector 40 absorbs the current induced by the external strong electromagnetic field on the shield 16 and the motor controller 60 through the third power surge protector first connection line 37 and the second connection line 38. After the current is absorbed, the current cannot reach saturation on the shield 16 and the electromagnetic field cannot penetrate the shield 16.