Electromagnetic interference filtering device and electric vehicle

Abstract

The invention relates to the technical field of new energy automobiles, in particular to an electromagnetic interference filtering device and an electric vehicle, a three-phase high-voltage cable is powered on and generates large electromagnetic interference, a first U-phase shielding wire and a first V-phase shielding wire penetrate through a first magnetic ring, and a second magnetic ring penetrates through a second U-phase shielding wire and a second V-phase shielding wire; the U-phase cable and the V-phase cable are connected through the first magnetic ring, so that the first magnetic ring absorbs and suppresses part of electromagnetic interference generated by the U-phase cable and the V-phase cable, meanwhile, the phase difference between the U-phase cable and the V-phase cable is 120 degrees, part of electromagnetic interference generated by the U-phase cable and the V-phase cable is counteracted, and a good electromagnetic shielding effect on the U-phase cable and the V-phase cable is achieved. The structures and principles of the second shielding assembly and the third shielding assembly are the same as those of the first shielding assembly, so that the second shielding assembly has a better electromagnetic shielding effect on U-phase and W-phase cables; the third shielding assembly can have a good electromagnetic shielding effect on the V-phase and W-phase cables, the shielding current in the shielding layer of the high-voltage cable is reduced, and the reliability of the shielding layer contact body of the high-voltage connector is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an electromagnetic interference filtering device and an electric vehicle. Background Art

[0002] With the rapid development of new energy vehicles, most car companies have increased their research and development efforts in new energy vehicles. New energy vehicles are mainly driven by electricity, and the motor controller transmits the three-phase high voltage electricity provided by the power battery to the motor through a high-voltage cable.

[0003] In the above process, the three-phase output current of the motor controller is large, and the electromagnetic field generated on the high-voltage cable is large. The layout of the whole vehicle is limited. In some scenarios, the high-voltage cable is close to the low-voltage signal line. The high-voltage cable is easy to interfere with the low-voltage signal line, resulting in incorrect low-voltage signal collection and error frames on the CAN line. These phenomena will affect the normal operation of other electronic components on the vehicle and affect driving safety. In addition, if the shielding current is too large, the shielding contact spring (or shielding contact body) of the high-voltage connector will experience excessive temperature rise, thereby causing the shielding layer of the high-voltage connector to fail.

[0004] Therefore, an electromagnetic interference filtering device is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an electromagnetic interference filtering device and an electric vehicle to solve the problems in the related art that the three-phase output current of the motor controller is large, the high-voltage cable is easy to interfere with the low-voltage signal line, resulting in incorrect low-voltage signal acquisition, error frames for the CAN line, and excessive shielding current and poor stability of the high-voltage cable connector.

[0006] In one aspect, the present invention provides an electromagnetic interference filtering device for being arranged on a three-phase high-voltage cable between a motor controller and a motor, the electromagnetic interference filtering device comprising:

[0007] A first shielding assembly, comprising a first U-phase shielding wire, a first V-phase shielding wire and a first magnetic ring, wherein two ends of the first U-phase shielding wire are used to be connected in parallel with the shielding layer of the U-phase cable of the three-phase high-voltage cable, and two ends of the first V-phase shielding wire are used to be connected in parallel with the shielding layer of the V-phase cable of the three-phase high-voltage cable, and the first U-phase shielding wire and the first V-phase shielding wire are both passed through the first magnetic ring;

[0008] A second shielding assembly includes a second U-phase shielding wire, a first W-phase shielding wire and a second magnetic ring, wherein two ends of the second U-phase shielding wire are used to be connected in parallel with the shielding layer of the U-phase cable, and two ends of the first W-phase shielding wire are used to be connected in parallel with the shielding layer of the W-phase cable of the three-phase high-voltage cable, and the second U-phase shielding wire and the first W-phase shielding wire are both passed through the second magnetic ring;

[0009] The third shielding assembly includes a second V-phase shielding wire, a second W-phase shielding wire and a third magnetic ring, wherein the two ends of the second V-phase shielding wire are used to be connected in parallel with the shielding layer of the V-phase cable, and the two ends of the second W-phase shielding wire are used to be connected in parallel with the shielding layer of the W-phase cable, and the second V-phase shielding wire and the second W-phase shielding wire are both passed through the third magnetic ring.

[0010] As a preferred technical solution of the electromagnetic interference filtering device, the U-phase cable includes a U-phase shielding layer and a U-phase insulating layer coated outside the U-phase shielding layer, and the U-phase insulating layer is provided with four U-phase lead-out holes exposing the U-phase shielding layer along the axial direction of the U-phase cable;

[0011] It also includes four U-phase shielded wire lead-out pieces, and the two ends of the first U-phase shielded wire and the two ends of the second U-phase shielded wire are connected to the U-phase shielding layers in the four U-phase lead-out holes through the four U-phase shielded wire lead-out pieces in a one-to-one correspondence.

[0012] As an optimal technical solution for the electromagnetic interference filtering device, the U-phase shielded wire lead-out part includes a U-phase insulating sleeve and a U-phase shielding layer lead-out wire, the U-phase insulating sleeve is arranged on the U-phase cable and seals the corresponding U-phase lead-out hole, one end of the U-phase shielding layer lead-out wire passes through the U-phase insulating sleeve and is connected to the corresponding U-phase shielding layer, the other ends of the four U-phase shielding layer lead-out wires are connected one by one with the two ends of the first U-phase shielding wire and the two ends of the second U-phase shielding wire, and the U-phase shielding layer lead-out wire is interference fit with the U-phase insulating sleeve.

[0013] As a preferred technical solution for the electromagnetic interference filtering device, the U-phase insulating sleeve includes a first U-phase insulating sleeve and a second U-phase insulating sleeve, the first U-phase insulating sleeve and the second U-phase insulating sleeve are slidably sleeved on the U-phase cable, the first U-phase insulating sleeve and the second U-phase insulating sleeve are abutted along the axial direction of the U-phase cable, so that the first U-phase insulating sleeve and the second U-phase insulating sleeve are surrounded by the U-phase insulating layer to form a sealed cavity, and the sealed cavity is connected to the corresponding U-phase lead-out hole.

[0014] As an optimal technical solution for the electromagnetic interference filtering device, it also includes a shielding box, which includes a shielding shell, and the shielding shell is provided with a shielding cavity and two wire threading holes connected to the shielding cavity. The three-phase high-voltage cable is sequentially passed through the two wire threading holes, and the first shielding component, the second shielding component and the third shielding component are all located in the shielding cavity.

[0015] As an optimal technical solution for the electromagnetic interference filtering device, the shielding box also includes two shielding plugs, which are sleeved on the three-phase high-voltage cable and respectively inserted into the two threading holes. The shielding plugs are used to fill the gap between the corresponding hole wall of the threading hole and the three-phase high-voltage cable.

[0016] As a preferred technical solution for the electromagnetic interference filtering device, the shielding shell is an aluminum alloy shell.

[0017] As a preferred technical solution of the electromagnetic interference filtering device, the first magnetic ring, the second magnetic ring and the third magnetic ring are arranged in sequence and at intervals;

[0018] The shielding box also includes two magnetic isolation plates, which are respectively arranged in the shielding cavity, one magnetic isolation plate is arranged between the first magnetic ring and the second magnetic ring, and the other magnetic isolation plate is arranged between the second magnetic ring and the third magnetic ring.

[0019] As an optimal technical solution for the electromagnetic interference filtering device, the first magnetic ring is a ferrite magnetic ring, a manganese-zinc magnetic ring, or a nanocrystalline magnetic ring, the second magnetic ring is a ferrite magnetic ring, a manganese-zinc magnetic ring, or a nanocrystalline magnetic ring, and the third magnetic ring is a ferrite magnetic ring, a manganese-zinc magnetic ring, or a nanocrystalline magnetic ring.

[0020] On the other hand, the present invention provides an electric vehicle, comprising a vehicle frame, a motor, a motor controller and the electromagnetic interference filtering device in any of the above schemes, wherein the motor and the motor controller are respectively fixed to the vehicle frame.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides an electromagnetic interference filtering device and an electric vehicle, which are used to be arranged on a three-phase high-voltage cable between a motor controller and a motor. The electromagnetic interference filtering device includes a first shielding component, a second shielding component and a third shielding component. The first shielding component includes a first U-phase shielding wire, a first V-phase shielding wire and a first magnetic ring. The two ends of the first U-phase shielding wire are used to be connected in parallel with the shielding layer of the U-phase cable of the three-phase high-voltage cable, and the two ends of the first V-phase shielding wire are used to be connected in parallel with the shielding layer of the V-phase cable of the three-phase high-voltage cable. The first U-phase shielding wire and the first V-phase shielding wire are both passed through the first magnetic ring; the second shielding component includes a first U-phase shielding wire, a first V-phase shielding wire and a first magnetic ring. Two U-phase shielded wires, a first W-phase shielded wire and a second magnetic ring, both ends of the second U-phase shielded wire are used to be connected in parallel with the shielding layer of the U-phase cable, both ends of the first W-phase shielded wire are used to be connected in parallel with the shielding layer of the W-phase cable of the three-phase high-voltage cable, and the second U-phase shielded wire and the first W-phase shielded wire are both passed through the second magnetic ring; the third shielding assembly includes a second V-phase shielded wire, a second W-phase shielded wire and a third magnetic ring, both ends of the second V-phase shielded wire are used to be connected in parallel with the shielding layer of the V-phase cable, both ends of the second W-phase shielded wire are used to be connected in parallel with the shielding layer of the W-phase cable, and the second V-phase shielded wire and the second W-phase shielded wire are both passed through the third magnetic ring. When the electric vehicle is running, the motor controller transmits high-voltage electric energy to the motor through the three-phase high-voltage cable. During this process, the three-phase high-voltage cable will generate greater electromagnetic interference. Since the two ends of the first U-phase shielded wire are used to be connected in parallel with the shielding layer of the U-phase cable, and the two ends of the first V-phase shielded wire are used to be connected in parallel with the shielding layer of the V-phase cable, the first U-phase shielded wire and the first V-phase shielded wire are both passed through the first magnetic ring, so that the first magnetic ring can absorb and suppress part of the electromagnetic interference generated by the U-phase cable and the V-phase cable. At the same time, the phase difference between the U-phase and the V-phase is 120°, so part of the electromagnetic interference generated by the U-phase cable and the V-phase cable can also be offset, so as to have a better electromagnetic shielding effect on the U-phase cable and the V-phase cable. The structure and principle of the second shielding component and the third shielding component are the same as the structure and principle of the first shielding component. Therefore, the second shielding component can have a better electromagnetic shielding effect on the U-phase cable and the W-phase cable; the third shielding component can have a better electromagnetic shielding effect on the V-phase cable and the W-phase cable. In summary, the electromagnetic interference filtering device can effectively improve the problem that when the three-phase output current of the motor controller is large, the high-voltage cable is easy to interfere with the low-voltage signal line, resulting in incorrect low-voltage signal acquisition and error frames on the CAN line. At the same time, the shielding current is reduced, and the reliability of the high-voltage connector shielding layer contact body is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the electromagnetic interference filtering device in an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the U-phase shielded wire lead-out component in an embodiment of the present invention.

[0025] In the figure:

[0026] 100, three-phase high-voltage cable; 101, U-phase cable; 1011, U-phase conductor; 1012, U-phase inner insulation layer; 1013, U-phase shielding layer; 1014, U-phase insulation layer; 1015, U-phase lead-out hole; 102, V-phase cable; 103, W-phase cable;

[0027] 200, motor; 300, motor controller;

[0028] 1. first shielding assembly; 11. first U-phase shielding wire; 12. first V-phase shielding wire; 13. first magnetic ring;

[0029] 2. Second shielding assembly; 21. Second U-phase shielding wire; 22. First W-phase shielding wire; 23. Second magnetic ring;

[0030] 3. The third shielding assembly; 31. The second V-phase shielding wire; 32. The second W-phase shielding wire; 33. The third magnetic ring;

[0031] 41, U-phase insulating sleeve; 411, first U-phase insulating sleeve; 412, second U-phase insulating sleeve; 42, U-phase shielding layer lead wire;

[0032] 5. Shielding box. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] Embodiment 1

[0038] like Figure 1 and Figure 2As shown, the present embodiment provides an electromagnetic interference filtering device, which is used to be arranged on a three-phase high-voltage cable 100 between a motor controller 300 and a motor 200, and the electromagnetic interference filtering device includes a first shielding component 1, a second shielding component 2 and a third shielding component 3, the first shielding component 1 includes a first U-phase shielding wire 11, a first V-phase shielding wire 12 and a first magnetic ring 13, the two ends of the first U-phase shielding wire 11 are used to be connected in parallel with the shielding layer of the U-phase cable 101 of the three-phase high-voltage cable 100, the two ends of the first V-phase shielding wire 12 are used to be connected in parallel with the shielding layer of the V-phase cable 102 of the three-phase high-voltage cable 100, and the first U-phase shielding wire 11 and the first V-phase shielding wire 12 are both passed through the first magnetic ring 13; the second shielding component 2 includes a second U-phase shielding wire 11, a first V-phase shielding wire 12 and a first magnetic ring 13. The shielding wire 21, the first W-phase shielding wire 22 and the second magnetic ring 23, the two ends of the second U-phase shielding wire 21 are used to be connected in parallel with the shielding layer of the U-phase cable 101, the two ends of the first W-phase shielding wire 22 are used to be connected in parallel with the shielding layer of the W-phase cable 103 of the three-phase high-voltage cable 100, and the second U-phase shielding wire 21 and the first W-phase shielding wire 22 are both passed through the second magnetic ring 23; the third shielding assembly 3 includes a second V-phase shielding wire 31, a second W-phase shielding wire 32 and a third magnetic ring 33, the two ends of the second V-phase shielding wire 31 are used to be connected in parallel with the shielding layer of the V-phase cable 102, the two ends of the second W-phase shielding wire 32 are used to be connected in parallel with the shielding layer of the W-phase cable 103, and the second V-phase shielding wire 31 and the second W-phase shielding wire 32 are both passed through the third magnetic ring 33. When the electric vehicle is running, the motor controller 300 transmits high-voltage electric energy to the motor 200 through the three-phase high-voltage cable 100. During this process, the three-phase high-voltage cable 100 will generate greater electromagnetic interference. Since the two ends of the first U-phase shielded wire 11 are used to be connected in parallel with the shielding layer of the U-phase cable 101, and the two ends of the first V-phase shielded wire 12 are used to be connected in parallel with the shielding layer of the V-phase cable 102, the first U-phase shielded wire 11 and the first V-phase shielded wire 12 are both passed through the first magnetic ring 13, so that the first magnetic ring 13 can absorb and suppress part of the electromagnetic interference generated by the U-phase cable 101 and the V-phase cable 102. At the same time, the phase difference between the U-phase and the V-phase is 120°. Therefore, part of the electromagnetic interference generated by the U-phase cable 101 and the V-phase cable 102 can also be offset, so as to have a better electromagnetic shielding effect on the U-phase cable 101 and the V-phase cable 102. The structure and principle of the second shielding component 2 and the third shielding component 3 are the same as the structure and principle of the first shielding component 1. Therefore, the second shielding component 2 can have a good electromagnetic shielding effect on the U-phase cable 101 and the W-phase cable 103; the third shielding component 3 can have a good electromagnetic shielding effect on the V-phase cable 102 and the W-phase cable 103. In summary, the electromagnetic interference filtering device can effectively improve the problem that when the three-phase output current of the motor controller 300 is large, the high-voltage cable is easy to interfere with the low-voltage signal line, resulting in incorrect low-voltage signal collection and error frames for the CAN line. At the same time, the shielding current in the shielding layer of the high-voltage cable is reduced, which improves the reliability of the shielding layer contact body of the high-voltage connector.

[0039] Optionally, the U-phase cable 101 includes a U-phase shielding layer 1013 and a U-phase insulating layer 1014 coated on the outside of the U-phase shielding layer 1013, and the U-phase insulating layer 1014 is provided with four U-phase lead-out holes 1015 for exposing the U-phase shielding layer 1013 along the axial direction of the U-phase cable 101; the electromagnetic interference filtering device also includes four U-phase shielding wire lead-out pieces, and the two ends of the first U-phase shielding wire 11 and the two ends of the second U-phase shielding wire 21 are connected to the U-phase shielding layer 1013 in the four U-phase lead-out holes 1015 through the four U-phase shielding wire lead-out pieces one by one. In this embodiment, the U-phase cable 101 includes a U-phase conductor 1011 and a U-phase inner insulating layer 1012, a U-phase shielding layer 1013 and a U-phase insulating layer 1014 which are sequentially sleeved on the U-phase conductor 1011. The U-phase shielding wire lead-out piece can realize that the U-phase shielding layer 1013 is respectively connected to the two ends of the first U-phase shielding wire 11 and the two ends of the second U-phase shielding wire 21, and can also seal the U-phase lead-out hole 1015.

[0040] Optionally, the V-phase cable 102 includes a V-phase shielding layer and a V-phase insulating layer coated outside the V-phase shielding layer, and the V-phase insulating layer is provided with four V-phase lead-out holes for exposing the V-phase shielding layer along the axial direction of the V-phase cable 102; the electromagnetic interference filtering device also includes four V-phase shielding wire lead-out pieces, and the two ends of the first V-phase shielding wire 12 and the two ends of the second V-phase shielding wire 31 are connected to the V-phase shielding layer in the four V-phase lead-out holes through four V-phase shielding wire lead-out pieces in a one-to-one correspondence. In this embodiment, the V-phase shielding wire lead-out piece can realize the V-phase shielding layer being connected to the two ends of the first V-phase shielding wire 12 and the two ends of the second V-phase shielding wire 31 in parallel, and can also seal the V-phase lead-out hole.

[0041] Optionally, the W-phase cable 103 includes a W-phase shielding layer and a W-phase insulating layer coated outside the W-phase shielding layer, and the W-phase insulating layer is provided with four W-phase lead-out holes for exposing the W-phase shielding layer along the axial direction of the W-phase cable 103; the electromagnetic interference filtering device also includes four W-phase shielding wire lead-out pieces, and the two ends of the first W-phase shielding wire 22 and the two ends of the second W-phase shielding wire 32 are connected to the W-phase shielding layer in the four W-phase lead-out holes through four W-phase shielding wire lead-out pieces in a one-to-one correspondence. In this embodiment, the W-phase shielding wire lead-out piece can realize the parallel connection of the W-phase shielding layer with the two ends of the first W-phase shielding wire 22 and the two ends of the second W-phase shielding wire 32, respectively, and can also seal the W-phase lead-out hole to prevent the entry of rain or dust from the outside.

[0042] As for the specific structure of the U-phase shielded wire lead-out part, optionally, the U-phase shielded wire lead-out part includes a U-phase insulating sleeve 41 and a U-phase shielding layer lead-out wire 42, the U-phase insulating sleeve 41 is sleeved on the U-phase cable 101 and seals the corresponding U-phase lead-out hole 1015, one end of the U-phase shielding layer lead-out wire 42 passes through the U-phase insulating sleeve 41 and is connected to the corresponding U-phase shielding layer 1013, the other ends of the four U-phase shielding layer lead-out wires 42 are connected one by one to the two ends of the first U-phase shielded wire 11 and the two ends of the second U-phase shielded wire 21, and the U-phase shielding layer lead-out wire 42 is interference fit with the U-phase insulating sleeve 41. In this embodiment, the U-phase insulating sleeve 41 is sleeved on the U-phase cable 101 and is interference fit with the U-phase cable 101 to prevent external dust and water vapor from entering the U-phase lead-out hole 1015.

[0043] Optionally, the U-phase insulating sleeve 41 includes a first U-phase insulating sleeve 411 and a second U-phase insulating sleeve 412, and the first U-phase insulating sleeve 411 and the second U-phase insulating sleeve 412 are slidably sleeved on the U-phase cable 101, and the first U-phase insulating sleeve 411 and the second U-phase insulating sleeve 412 are abutted along the axial direction of the U-phase cable 101, so that the first U-phase insulating sleeve 411 and the second U-phase insulating sleeve 412 and the U-phase insulating layer 1014 form a sealed cavity, and the sealed cavity is connected to the corresponding U-phase lead-out hole 1015. In this embodiment, the first U-phase insulating sleeve 411 and the second U-phase insulating sleeve 412 have a first position and a second position. The first position is that the first U-phase insulating sleeve 411 and the second U-phase insulating sleeve 412 are spaced apart. At this time, the U-phase shielding layer lead wire 42 can be connected to the U-phase shielding layer 1013. When the U-phase shielding layer lead wire 42 is connected to the U-phase shielding layer 1013, the first U-phase insulating sleeve 411 and the second U-phase insulating sleeve 412 are in the second position where they abut against each other.

[0044] Specifically, the first U-phase insulating sleeve 411 or the second U-phase insulating sleeve 412 is provided with a through hole, and the U-phase shielding layer lead wire 42 is passed through the through hole and is interference-fitted with the hole wall of the through hole.

[0045] Optionally, the structures of the W-phase shielded wire lead-out piece and the V-phase shielded wire lead-out piece are the same as the structure of the U-phase shielded wire lead-out piece, and are not described in detail here.

[0046] Optionally, the electromagnetic interference filtering device further includes a shielding box 5, the shielding box 5 includes a shielding shell, the shielding shell is provided with a shielding cavity and two threading holes connected to the shielding cavity, the three-phase high-voltage cable 100 is sequentially passed through the two threading holes, and the first shielding component 1, the second shielding component 2 and the third shielding component 3 are all located in the shielding cavity. In this embodiment, the shielding box 5 provided above can further shield electromagnetic interference, reduce electromagnetic radiation, and further improve the shielding effect.

[0047] Optionally, the shielding box 5 further includes two shielding plugs, which are sleeved on the three-phase high-voltage cable 100, and are respectively inserted into the two threading holes, and the shielding plugs are used to fill the gap between the hole wall of the corresponding threading hole and the three-phase high-voltage cable 100. In this embodiment, the above arrangement further improves the shielding effect of the shielding box 5 and prevents electromagnetic radiation from leaking from the outlet hole.

[0048] Specifically, the shielding shell is an aluminum alloy shell. In other embodiments, the shielding shell can also be made of stainless steel or nickel silver or tinplate.

[0049] Optionally, the first magnetic ring 13, the second magnetic ring 23 and the third magnetic ring 33 are arranged in sequence; the shielding box 5 also includes two magnetic isolation plates, which are respectively arranged in the shielding cavity, one magnetic isolation plate is arranged between the first magnetic ring 13 and the second magnetic ring 23, and the other magnetic isolation plate is arranged between the second magnetic ring 23 and the third magnetic ring 33. In this embodiment, the magnetic isolation plate is arranged between the first magnetic ring 13 and the second magnetic ring 23, and this arrangement can avoid mutual interference between the first magnetic ring 13 and the second magnetic ring 23, and the magnetic isolation plate is arranged between the second magnetic ring 23 and the third magnetic ring 33, and this arrangement can avoid mutual interference between the second magnetic ring 23 and the third magnetic ring 33.

[0050] Optionally, the first magnetic ring 13 is a ferrite magnetic ring, a manganese zinc magnetic ring, or a nanocrystalline magnetic ring, the second magnetic ring 23 is a ferrite magnetic ring, a manganese zinc magnetic ring, or a nanocrystalline magnetic ring, and the third magnetic ring 33 is a ferrite magnetic ring, a manganese zinc magnetic ring, or a nanocrystalline magnetic ring.

[0051] The present embodiment also provides an electric vehicle, comprising a vehicle frame, a motor 200, a motor controller 300 and the electromagnetic interference filtering device in the above solution, wherein the motor 200 and the motor controller 300 are respectively fixed to the vehicle frame. In the present embodiment, the above arrangement can enable the first magnetic ring 13, the second magnetic ring 23 and the third magnetic ring 33 to be grounded through the vehicle frame, thereby releasing the electromagnetic radiation absorbed by the first magnetic ring 13, the second magnetic ring 23 and the third magnetic ring 33.

[0052] Embodiment 2

[0053] This embodiment is basically the same as the first embodiment, the only difference is that: the first shielding component 1 includes a first U-phase shielding wire 11, a first V-phase shielding wire 12, a third W-phase shielding wire and a first magnetic ring 13, the two ends of the first U-phase shielding wire 11 are used to be connected in parallel with the shielding layer of the U-phase cable 101 of the three-phase high-voltage cable 100, the two ends of the first V-phase shielding wire 12 are used to be connected in parallel with the shielding layer of the V-phase cable 102 of the three-phase high-voltage cable 100, and the two ends of the third W-phase shielding wire are used to be connected in parallel with the shielding layer of the W-phase cable 103 of the three-phase high-voltage cable 100, and the first U-phase shielding wire 11, the first V-phase shielding wire 12 and the third W-phase shielding wire are all passed through the first magnetic ring 13; the second shielding component 2 includes a second U-phase shielding wire 21, a third V-phase shielding wire, a first W-phase shielding wire 22 and a second magnetic ring 23, and the two ends of the second U-phase shielding wire 21 are used to be connected in parallel with the shielding layer of the U-phase cable 101 of the three-phase high-voltage cable 100. The shielding layer of the three-phase high-voltage cable 100 is connected in parallel, and both ends of the third V-phase shielding wire are used to be connected in parallel with the shielding layer of the V-phase cable 101, and both ends of the first W-phase shielding wire 22 are used to be connected in parallel with the shielding layer of the W-phase cable 103 of the three-phase high-voltage cable 100, and the second U-phase shielding wire 21, the third V-phase shielding wire and the first W-phase shielding wire 22 are all passed through the second magnetic ring 23; the third shielding assembly 3 includes a third U-phase shielding wire, a second V-phase shielding wire 31, a second W-phase shielding wire 32 and a third magnetic ring 33, and both ends of the third U-phase shielding wire are used to be connected in parallel with the shielding layer of the U-phase cable 101, and both ends of the second V-phase shielding wire 31 are used to be connected in parallel with the shielding layer of the V-phase cable 102, and both ends of the second W-phase shielding wire 32 are used to be connected in parallel with the shielding layer of the W-phase cable 103, and the third U-phase shielding wire, the second V-phase shielding wire 31 and the second W-phase shielding wire 32 are all passed through the third magnetic ring 33.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electromagnetic interference filtering device, used for being arranged on a three-phase high-voltage cable (100) between a motor controller (300) and a motor (200), characterized in that: include: A first shielding assembly (1), comprising a first U-phase shielding wire (11), a first V-phase shielding wire (12) and a first magnetic ring (13), wherein two ends of the first U-phase shielding wire (11) are used to be connected in parallel with the shielding layer of the U-phase cable (101) of the three-phase high-voltage cable (100), and two ends of the first V-phase shielding wire (12) are used to be connected in parallel with the shielding layer of the V-phase cable (102) of the three-phase high-voltage cable (100), and the first U-phase shielding wire (11) and the first V-phase shielding wire (12) are both passed through the first magnetic ring (13); A second shielding assembly (2), comprising a second U-phase shielding wire (21), a first W-phase shielding wire (22) and a second magnetic ring (23), wherein two ends of the second U-phase shielding wire (21) are used to be connected in parallel with the shielding layer of the U-phase cable (101), and two ends of the first W-phase shielding wire (22) are used to be connected in parallel with the shielding layer of the W-phase cable (103) of the three-phase high-voltage cable (100), and the second U-phase shielding wire (21) and the first W-phase shielding wire (22) are both passed through the second magnetic ring (23); The third shielding assembly (3) comprises a second V-phase shielding wire (31), a second W-phase shielding wire (32) and a third magnetic ring (33); the two ends of the second V-phase shielding wire (31) are used to be connected in parallel with the shielding layer of the V-phase cable (102); the two ends of the second W-phase shielding wire (32) are used to be connected in parallel with the shielding layer of the W-phase cable (103); the second V-phase shielding wire (31) and the second W-phase shielding wire (32) are both passed through the third magnetic ring (33).

2. The electromagnetic interference filtering device according to claim 1, characterized in that: The U-phase cable (101) comprises a U-phase shielding layer (1013) and a U-phase insulating layer (1014) coated outside the U-phase shielding layer (1013); the U-phase insulating layer (1014) is provided with four U-phase lead-out holes (1015) for exposing the U-phase shielding layer (1013) along the axial direction of the U-phase cable (101); It also includes four U-phase shielded wire lead-out pieces, and the two ends of the first U-phase shielded wire (11) and the two ends of the second U-phase shielded wire (21) are connected to the U-phase shielding layer (1013) in the four U-phase lead-out holes (1015) through the four U-phase shielded wire lead-out pieces in a one-to-one correspondence.

3. The electromagnetic interference filtering device according to claim 2, characterized in that: The U-phase shielded wire lead-out component comprises a U-phase insulating sleeve (41) and a U-phase shielding layer lead-out wire (42); the U-phase insulating sleeve (41) is sleeved on the U-phase cable (101) and seals the corresponding U-phase lead-out hole (1015); one end of the U-phase shielding layer lead-out wire (42) passes through the U-phase insulating sleeve (41) and is connected to the corresponding U-phase shielding layer (1013); the other ends of the four U-phase shielding layer lead-out wires (42) are connected one by one to the two ends of the first U-phase shielded wire (11) and the two ends of the second U-phase shielded wire (21); the U-phase shielding layer lead-out wire (42) is interference fit with the U-phase insulating sleeve (41).

4. The electromagnetic interference filtering device according to claim 3, characterized in that: The U-phase insulating sleeve (41) comprises a first U-phase insulating sleeve (411) and a second U-phase insulating sleeve (412); the first U-phase insulating sleeve (411) and the second U-phase insulating sleeve (412) are slidably sleeved on the U-phase cable (101); the first U-phase insulating sleeve (411) and the second U-phase insulating sleeve (412) are abutted along the axial direction of the U-phase cable (101) so that the first U-phase insulating sleeve (411) and the second U-phase insulating sleeve (412) and the U-phase insulating layer (1014) form a sealed cavity; the sealed cavity is connected to the corresponding U-phase lead-out hole (1015).

5. The electromagnetic interference filtering device according to claim 1, characterized in that: The invention also comprises a shielding box (5), wherein the shielding box (5) comprises a shielding shell, wherein the shielding shell is provided with a shielding cavity and two threading holes connected to the shielding cavity, wherein the three-phase high-voltage cable (100) is sequentially passed through the two threading holes, and the first shielding component (1), the second shielding component (2) and the third shielding component (3) are all located in the shielding cavity.

6. The electromagnetic interference filtering device according to claim 5, characterized in that: The shielding box (5) further comprises two shielding plugs, the two shielding plugs are sleeved on the three-phase high-voltage cable (100), the two shielding plugs are respectively inserted into the two threading holes, and the shielding plugs are used to fill the gap between the hole wall of the corresponding threading hole and the three-phase high-voltage cable (100).

7. The electromagnetic interference filtering device according to claim 5, characterized in that: The shielding shell is an aluminum alloy shell.

8. The electromagnetic interference filtering device according to claim 5, characterized in that: The first magnetic ring (13), the second magnetic ring (23) and the third magnetic ring (33) are arranged in sequence and spaced apart; The shielding box (5) further comprises two magnetic isolation plates, the two magnetic isolation plates being respectively arranged in the shielding cavity, one magnetic isolation plate being arranged between the first magnetic ring (13) and the second magnetic ring (23), and the other magnetic isolation plate being arranged between the second magnetic ring (23) and the third magnetic ring (33).

9. The electromagnetic interference filtering device according to claim 1, characterized in that: The first magnetic ring (13) is a ferrite magnetic ring, a manganese zinc magnetic ring or a nanocrystalline magnetic ring, the second magnetic ring (23) is a ferrite magnetic ring, a manganese zinc magnetic ring or a nanocrystalline magnetic ring, and the third magnetic ring (33) is a ferrite magnetic ring, a manganese zinc magnetic ring or a nanocrystalline magnetic ring.

10. An electric vehicle comprising a vehicle frame, a motor (200), a motor controller (300) and the electromagnetic interference filtering device according to any one of claims 1 to 9, wherein the motor (200) and the motor controller (300) are respectively fixed to the vehicle frame.

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