Filter for vehicle-mounted driving motor system

Abstract

The invention relates to a filter for a vehicle-mounted driving motor system, which comprises a common-mode magnetic ring group, a front noise filtering capacitor bank, a rear noise filtering capacitor bank, a high-voltage copper bar and a support, and is characterized in that the common-mode magnetic ring group is mounted in the support, and the front noise filtering capacitor bank and the rear noise filtering capacitor bank are mounted on one side of the support; the high-voltage copper bar passes through the common-mode magnetic ring group; the common-mode magnetic ring group comprises a primary magnetic core, a secondary magnetic core and a tertiary magnetic core; and the front noise filtering capacitor bank and the rear noise filtering capacitor bank respectively comprise an X capacitor, a Y capacitor and a damping resistor. Compared with the prior art, the system has the advantages that the topological structure has more expansibility, the magnetic cores of the common-mode magnetic ring group are selected according to the requirements of different driving motor systems on electromagnetic compatibility, and the application range is wide; the front noise filtering capacitor bank and the rear noise filtering capacitor bank are integrated into a two-in-one filter plate, so that the problem of ESL (Electronic Security Language) caused by overlong lead terminals is effectively solved; and a shielding cabin is formed by the filter through the shielding cover, so that a space coupling path is cut off, and the like.

Description

Technical Field

[0001] The invention relates to a filter, and in particular to a filter for a vehicle-mounted drive motor system. Background Art

[0002] With the continuous development of new energy electric vehicles and technological advancement, the functions of the whole vehicle are constantly increasing, gradually tending towards an all-in-one architecture, and the automotive electronic system is becoming increasingly complex. Under the new vehicle architecture situation, more emphasis is placed on the electromagnetic compatibility performance of components. Therefore, new energy vehicles have increasingly higher requirements for the electromagnetic compatibility performance of the drive motor system.

[0003] The drive motor system is an important part of electric vehicles and is located in the high-voltage core network of the entire system. The noise source of the drive motor system is mainly IGBT, and its noise propagation paths are mainly: 1) IGBT noise is transmitted to the wiring harness through power devices and copper bars; 2) IGBT noise source is coupled to the wiring harness through space. The existing filter design has poor flexibility, cannot be compatible with the design requirements of different levels of electromagnetic compatibility, and cannot give full play to the high-frequency characteristics of the filter.

[0004] Therefore, how to design a filter that is compatible with the design requirements of different levels of electromagnetic compatibility and has better performance is a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a filter for a vehicle-mounted drive motor system in order to overcome the defects of the above-mentioned prior art that it is incompatible with different levels of electromagnetic compatibility or has poor performance.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a filter for a vehicle-mounted drive motor system is provided, comprising a common-mode magnetic ring group, a front noise filtering capacitor group, a rear noise filtering capacitor group, a high-voltage copper busbar and a support, wherein the common-mode magnetic ring group is installed in the support, and the front noise filtering capacitor group and the rear noise filtering capacitor group are installed on one side of the support; the high-voltage copper busbar passes through the common-mode magnetic ring group; the common-mode magnetic ring group comprises a primary magnetic core, a secondary magnetic core and a tertiary magnetic core or comprises two of the primary magnetic core, the secondary magnetic core and the tertiary magnetic core; the front noise filtering capacitor group and the rear noise filtering capacitor group are connected in parallel to the high-voltage copper busbar, or one end of the front noise filtering capacitor group and the rear noise filtering capacitor group is connected to the high-voltage copper busbar and the other end is grounded.

[0008] As a preferred technical solution, the pre-noise filtering capacitor group and the post-noise filtering capacitor group are integrated into a two-in-one filter board; the pre-noise filtering capacitor group includes a pre-X capacitor and at least two pre-Y capacitor components; the post-noise filtering capacitor group includes a post-X capacitor and at least two post-Y capacitor components; the pre-X capacitor and the post-X capacitor are connected in parallel on the high-voltage copper busbar;

[0009] At least one front Y capacitor component and at least one rear Y capacitor component are connected to the positive electrode of the high-voltage copper busbar at one end and grounded at the other end; at least one front Y capacitor component and at least one rear Y capacitor component are connected to the negative electrode of the high-voltage copper busbar at one end and grounded at the other end.

[0010] As a preferred technical solution, the front Y capacitor assembly includes a front Y capacitor and a front damping resistor connected in series; the rear Y capacitor assembly includes a rear Y capacitor and a rear damping resistor connected in series; the two-in-one filter board has a front X capacitor, a front Y capacitor, a rear X capacitor and a rear Y capacitor arranged on one side, and a front damping resistor and a rear damping resistor arranged on the other side.

[0011] As a preferred technical solution, the two-in-one filter board and the high-voltage copper bus are welded via PIN pins; and the GND end of the two-in-one filter board is connected to the support via bolts.

[0012] As a preferred technical solution, the primary magnetic core, secondary magnetic core and tertiary magnetic core are each made of manganese-zinc ferrite or nickel-zinc ferrite, and the inner diameters of the primary magnetic core, secondary magnetic core and tertiary magnetic core are greater than or equal to the width of the high-voltage copper busbar.

[0013] As a preferred technical solution, the support is divided into a copper bar installation position and three magnetic core installation slots by a baffle; a mounting hole is provided in the copper bar installation position; the high-voltage copper bar is installed in the copper bar installation position, and the two or three magnetic cores of the common mode magnetic ring group are installed in different magnetic core installation slots.

[0014] As a preferred technical solution, the high-voltage copper bar includes a positive front copper bar and a positive rear copper bar connected to each other, and a negative front copper bar and a negative rear copper bar connected to each other; the copper bar installation position includes a front copper bar installation position and a rear copper bar installation position which are respectively located on both sides of the support and are divided into two parts by a retaining wall inside, the two parts of the front copper bar installation position are respectively installed with the positive front copper bar and the negative front copper bar, and the two parts of the rear copper bar installation position are respectively installed with the positive rear copper bar and the negative rear copper bar.

[0015] As a preferred technical solution, the high-voltage copper busbar includes two positive electrode welding terminals and two negative electrode welding terminals, and the two positive electrode welding terminals are respectively laser welded to the positive front copper busbar and the positive rear copper busbar; the two negative electrode welding terminals are respectively laser welded to the negative front copper busbar and the negative rear copper busbar.

[0016] As a preferred technical solution, the support is a rectangular parallelepiped, and the three core mounting grooves include a runway-shaped core groove, a secondary U-shaped core groove and a tertiary U-shaped core groove; the runway-shaped core groove and the front copper busbar mounting position are arranged on both sides of one end of the support along the width direction of the support; the secondary U-shaped core groove, the tertiary U-shaped core groove and the rear copper busbar mounting position are arranged at the other end of the support along the length direction of the support.

[0017] As a preferred technical solution, the filter also includes a shielding cover, which is installed on one side of the support and forms a closed copper bar installation position and three magnetic core installation slots with the baffle; a rubber pad is provided on the surface of the shielding cover that contacts the support.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The topological structure of the present invention has more expansibility. The magnetic core of the common-mode magnetic ring group is selected according to the requirements of different drive motor systems for electromagnetic compatibility, and can be flexibly adjusted to topological structures such as LCLCL, CLCL, LCLC and LCCL, with a wide range of adaptability; when the topological structure is LCLCL, the first, third and fifth stages are designed with a three-level magnetic core structure, and the second and fourth stages are designed with noise filtering capacitor groups. Parameters are selected according to the differential mode and common mode noise frequency bands, and the filter performance is good;

[0020] 2) The pre-noise filtering capacitor group and the post-noise filtering capacitor group of the present invention are integrated into a two-in-one filter board, which effectively solves the ESL introduced by the excessively long lead terminal; the two-in-one filter board and the high-voltage copper bus are welded by PIN pins; the GND end of the two-in-one filter board is connected to the support by bolts, which greatly reduces the ESL of the noise filtering capacitor group loop, avoids excessive ESL from entering the inductive area in advance, and improves the high-frequency performance of the filter board; the X capacitor is used to absorb differential mode noise, the Y capacitor can be used to deal with common mode noise in the risk frequency band, and the damping resistor is used to control the resonance peak;

[0021] 3) The present invention can select the core material according to its frequency characteristics to deal with the common mode noise in the medium and low frequency bands; the core made of manganese-zinc ferrite is used to deal with the common mode noise in the low frequency band, and the core made of nickel-zinc ferrite is used to deal with the common mode noise in the medium frequency band; only by ensuring that the high-voltage copper busbar can pass through the core, the inner diameter of the core is reduced, and the effective cross-sectional area of ​​the core is increased under the same volume, that is, the inductance of the core is increased;

[0022] 4) The support of the present invention is used for integrated installation of various components, providing a racetrack-shaped magnetic core slot and a square-shaped magnetic core slot for the magnetic core, and designing a retaining wall for the high-voltage copper busbar at the copper busbar installation position, thereby providing a safe creepage distance;

[0023] 5) The present invention forms a shielding chamber for the filter through the shielding cover, cuts off the spatial coupling path, and the noise conduction path effectively passes through the filter, and the noise energy is attenuated and absorbed, thereby effectively exerting the function of a high-performance filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a filter for a vehicle-mounted drive motor system of the present invention;

[0025] Figure 2 An exploded diagram of a filter for a vehicle-mounted drive motor system according to the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of a filter for a vehicle-mounted drive motor system excluding the shielding cover of the present invention;

[0027] Figure 4 It is a schematic diagram of the overall structure of the magnetic core and the support of the present invention;

[0028] Figure 5 It is a schematic diagram of the support structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the overall structure of the two-in-one filter board of the present invention;

[0030] Figure 7 This is a schematic diagram of one side arrangement of the two-in-one filter plate of the present invention;

[0031] Figure 8 This is a schematic diagram of the arrangement of the other side of the two-in-one filter plate of the present invention;

[0032] Fig. 9 This is a schematic diagram of fixing the two-in-one filter plate and the support of the present invention;

[0033] Fig.10 This is a schematic diagram of fixing the two-in-one filter board and the high-voltage copper busbar of the present invention;

[0034] Fig.11 This is a schematic diagram of the overall structure of the high-voltage copper busbar and the common-mode magnetic ring group of the present invention;

[0035] Fig.12 It is a top view of the high-voltage copper busbar and the common-mode magnetic ring assembly of the present invention;

[0036] Fig.13 It is a side view of the high-voltage copper busbar and the common-mode magnetic ring assembly of the present invention;

[0037] Fig.14This is an exploded view of the high-voltage copper busbar and the common-mode magnetic ring assembly of the present invention;

[0038] Fig.15 It is a schematic diagram of the structure of one side of the shielding cover of the present invention;

[0039] Fig.16 This is a schematic diagram of the structure of the other side of the shielding cover of the present invention;

[0040] Fig.17 This is a schematic diagram of a filter for a vehicle-mounted drive motor system of the present invention;

[0041] Fig.18 It is a Y capacitor impedance characteristic curve diagram of the present invention;

[0042] The numbers in the figure show:

[0043] 11. Primary magnetic core, 12. Secondary magnetic core, 13. Tertiary magnetic core, 21. Front X capacitor, 22. Front Y capacitor, 23. Front damping resistor, 31. Rear X capacitor, 32. Rear Y capacitor, 33. Rear damping resistor, 4. High-voltage copper busbar, 41. Positive front copper busbar, 42. Positive rear copper busbar, 43. Negative front copper busbar, 44. Negative rear copper busbar, 45. Positive welding terminal, 46. Negative welding terminal, 47. Limiting structure, 5. Support, 50. Block Wall, 51. Front copper busbar mounting position, 511. Input mounting hole, 52. Rear copper busbar mounting position, 521. Output mounting hole, 53. Racetrack-shaped magnetic core slot, 54. Secondary U-shaped magnetic core slot, 55. Tertiary U-shaped magnetic core slot, 56. First welding adapter hole, 57. Second welding adapter hole, 58. Third welding adapter hole, 59. Fourth welding adapter hole, 6. Two-in-one filter board, 61. GND terminal, 7. PIN needle, 8. Bolt, 9. Shielding cover, 10. Rubber pad. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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 should fall within the scope of protection of the present invention.

[0045] like Figure 1 to Figure 3 As shown, the present invention provides a filter for a vehicle-mounted drive motor system, including a common-mode magnetic ring group, a front noise filtering capacitor group, a rear noise filtering capacitor group, a high-voltage copper bus 4, a support 5 and a shielding cover 9.

[0046] The common mode magnetic ring group includes a primary magnetic core 11, a secondary magnetic core 12 and a tertiary magnetic core 13, or includes any two of the primary magnetic core 11, the secondary magnetic core 12 and the tertiary magnetic core 13. The primary magnetic core 11, the secondary magnetic core 12, the tertiary magnetic core 13, the front noise filtering capacitor group and the rear noise filtering capacitor group form an LCLCL topology structure, such as Fig.17 As shown, L1 is a primary magnetic core 11 device, CX1, CY1, CY2, CY3, CY4, R1, R2, R3, R4 are electronic components of the front noise filtering capacitor group, L2 is a secondary magnetic core 12 device, CX2, CY5, CY6, CY7, CY8, R5, R6, R7, R8 are electronic components of the rear noise filtering capacitor group, and L3 is a tertiary magnetic core 13 device. The topology of the present invention has more expansibility. According to the requirements of the vehicle manufacturer for the electromagnetic compatibility of the drive motor system, any two of the primary magnetic core 11, the secondary magnetic core 12 and the tertiary magnetic core 13 are selected to flexibly adjust to topological structures such as CLCL, LCLC and LCCL. The materials of the primary magnetic core 11, the secondary magnetic core 12 and the tertiary magnetic core 13 can be selected from manganese-zinc ferrite or nickel-zinc ferrite. The magnetic core made of manganese-zinc ferrite is used to deal with low-frequency common-mode noise, and the magnetic core made of nickel-zinc ferrite is used to deal with mid-frequency common-mode noise.

[0047] The front noise filtering capacitor group includes a front X capacitor 21, a front Y capacitor 22 and a front damping resistor 23; the rear noise filtering capacitor group includes a rear X capacitor 31, a rear Y capacitor 32 and a rear damping resistor 33. The front X capacitor 21 and the rear X capacitor 31 are used to absorb differential mode noise, the front Y capacitor 22 and the rear Y capacitor 32 can be flexibly selected to deal with common mode noise in the risk frequency band, and the front damping resistor 23 and the rear damping resistor 33 are used to control the resonance peak. Fig.17 As shown, CX1 is a front X capacitor 21, and its two ends are respectively connected to the positive copper bar and the negative copper bar of the high-voltage copper bus 4, so that the differential mode noise can be filtered to the negative electrode; CY1, CY2, CY3, and CY4 are front Y capacitors, and R1, R2, R3, and R4 are damping resistors. CY1 and R1 are connected in series, and CY2 and R2 are connected in series to form two front Y capacitor components, one end of which is connected to the positive electrode of the high-voltage copper bus 4, and the other end is grounded; CY3 and R3 are connected in series, and CY4 and R4 are connected in series to form two front Y capacitor components, one end of which is connected to the negative electrode of the high-voltage copper bus 4, and the other end is grounded; the common mode noise can be filtered to the ground; similarly, the connection relationship and filtering principle of CX2, CY5, CY6, CY7, CY8, R5, R6, R7, and R8 can be obtained.

[0048] like Figure 6 to Figure 10As shown, the front noise filtering capacitor group and the rear noise filtering capacitor group are integrated into a two-in-one filter board 6, which is installed on one side of the support 5. The high-voltage network of the two-in-one filter board 6 and the high-voltage copper bus 4 are welded with PIN pins 7, and the GND end 61 of the two-in-one filter board 6 is connected with the support 5 with bolts 8, which greatly reduces the ESL of the noise filtering capacitor group loop, avoids excessive ESL from entering the inductive area in advance, and improves the high-frequency performance of the two-in-one filter board 6. The two-in-one filter board 6 is arranged on one side with a front X capacitor 21, a front Y capacitor 22, a rear X capacitor 31 and a rear Y capacitor 32, and on the other side with a front damping resistor 23, the front Y capacitor 22 and the front damping resistor 23 are both 4, and one front Y capacitor 22 is connected in series with one front damping resistor 23; the rear Y capacitor 32 and the rear damping resistor 33 are both 4, and one rear Y capacitor 32 is connected in series with one rear damping resistor 33. The high-voltage wiring harness provides a power supply circuit path for the drive motor load and a noise discharge path for the front noise filtering capacitor group and the rear noise filtering capacitor group. Fig.18 As shown, the front Y capacitor 22 and the rear Y capacitor 32 realize the common-mode noise discharge path. For low-frequency noise, a Y capacitor of hundreds of nF is selected. For high-frequency noise bands, a small nF or pF Y capacitor is selected in combination with the loop ESL, and flexible selection is made to cope with common-mode noise in different frequency bands. The front damping resistor 23 and the rear damping resistor 33 are used for the Y capacitor to suppress the resonance peak and consume part of the energy of the noise oscillation. The larger the damping resistor, the better the energy consumption effect, but the common-mode insertion loss of the Y capacitor will be lower. Therefore, the damping resistor selection needs to be compromised with the common-mode insertion loss of the Y capacitor. The present invention uses a lower ohm-level resistor to provide a weak damping response.

[0049] Y capacitor impedance Where, Z: capacitor impedance, unit Ω; ESR: equivalent parasitic series resistance, unit Ω; f: frequency, unit Hz; Cap: capacitance, unit F; ESL: equivalent parasitic series inductance, unit H.

[0050] Core inductance L = AL × N 2 , Among them, AL: single-turn inductance, unit nH / N2; Ae: effective cross-sectional area, unit mm2; Le: effective magnetic path length, unit mm; Ui: initial magnetic permeability; L: inductance, unit nH; N: number of coil turns.

[0051] like Figure 11 to Figure 14As shown, the high-voltage copper bar 4 includes a positive copper bar, a negative copper bar, a positive welding terminal 45 and a negative welding terminal 46. The positive copper bar includes a positive front copper bar 41 and a positive rear copper bar 42 connected to each other, and the negative copper bar includes a negative front copper bar 43 and a negative rear copper bar 44 connected to each other. The high-voltage copper bar 4 passes through the common-mode magnetic ring group. The positive copper bar and the negative copper bar are laser welded respectively. When installing the secondary magnetic core 12 and the tertiary magnetic core 13, it is only necessary to ensure that the lateral area of ​​the high-voltage copper bar 4 can pass through the magnetic core, which greatly reduces the inner diameter of the magnetic core and increases the effective cross-sectional area of ​​the magnetic core under the same volume, that is, increases the inductance of the magnetic core. The laser welding process is used to achieve low parasitic parameter connection between high-voltage networks of high-performance filters, and effectively play the function of high-performance filters.

[0052] like Figure 4 and Figure 5 As shown, the support 5 is used to integrate the components of the filter, provide support and fixation for the filter, and the support 5 is divided into a copper bar installation position and three magnetic core installation slots by a baffle. The copper bar installation position includes a front copper bar installation position 51 and a rear copper bar installation position 52. The front copper bar installation position 51 is provided with an input installation hole 511, and the front copper bar installation position 51 is divided into two parts by a retaining wall 50, which are respectively used to install the positive front copper bar 41 and the negative front copper bar 43; the rear copper bar installation position 52 is provided with an output installation hole 521, and the rear copper bar installation position 52 is divided into two parts by a retaining wall 50, which are respectively used to install the positive rear copper bar 42 and the negative rear copper bar 44; the design of the retaining wall 50 provides a safe creepage distance. The magnetic core installation slots include a racetrack magnetic core slot 53, a secondary U-shaped magnetic core slot 54 and a tertiary U-shaped magnetic core slot 55. The primary magnetic core 11 is installed in the racetrack magnetic core slot 53, the secondary magnetic core 12 is installed in the secondary U-shaped magnetic core slot 54, and the tertiary magnetic core 13 is installed in the tertiary U-shaped magnetic core slot 55. The racetrack magnetic core slot 53 and the front copper bar installation position 51 are arranged on both sides of one end of the support 5 along the width direction of the support 5; the secondary U-shaped magnetic core slot 54, the tertiary U-shaped magnetic core slot 55 and the rear copper bar installation position 52 are arranged at the other end of the support 5 along the length direction of the support 5.

[0053] like Fig.15 and Fig.16 As shown, the shielding cover 9 is installed above the filter and fits with the support 5. A shielding chamber is formed in the support 5, which cuts off the spatial coupling path. The noise conduction path effectively passes through the filter, and the noise energy is attenuated and absorbed, thereby effectively playing the function of the filter. The surface of the shielding cover 9 in contact with the support 5 is provided with a rubber pad 10, and a boss structure is provided on the shielding cover 9, and the rubber pad 10 is fixed on the boss structure.

[0054] The installation process of the present invention is as follows:

[0055] First, assemble the high-voltage copper bar 4 and the common-mode magnetic ring assembly. Pass the positive rear copper bar 42 through the tertiary magnetic core 13 and the secondary magnetic core 12, fix the positive front copper bar 41 and the positive rear copper bar 42 by laser welding, and then fix the positive welding terminal 45 through the limiting structure 47 on the positive rear copper bar 42, and fix it on the positive rear copper bar 42 by laser welding, and then fix the second positive welding terminal 45 through the limiting structure 47 on the positive front copper bar 41, and fix it on the positive front copper bar 41 by laser welding; similarly, pass the negative rear copper bar 44 through the tertiary magnetic core 13 and the secondary magnetic core 12, fix the two negative welding terminals 46 through the limiting structures 47 on the negative front copper bar 43 and the negative rear copper bar 44, and fix them on the negative front copper bar 43 and the negative rear copper bar 44 by laser welding.

[0056] Then, assemble the two-in-one filter board 6, and make the front X capacitor 21, the front Y capacitor 22, the front damping resistor 23, the rear X capacitor 31, the rear Y capacitor 32 and the rear damping resistor 33 through reflow soldering and wave soldering to make the two-in-one filter board 6, and the front Y capacitor 22, the rear Y capacitor 32, the front X capacitor 21 and the rear X capacitor 31 need to be further fixed by dispensing 704 glue.

[0057] Finally, assemble the filter. Assemble the assembled two-in-one filter board 6 device to the back of the filter support 5 and fix it with four bolts 8, then put the high-voltage copper busbar 4 and the magnetic ring assembly part into the filter support 5: among them, align the tertiary magnetic core 13 and the secondary magnetic core 12 with the positions of the secondary U-shaped magnetic core slot 54 and the tertiary U-shaped magnetic core slot 55, align the welding terminals with the first welding transfer hole 56, the second welding transfer hole 57, the third welding transfer hole 58, the fourth welding transfer hole 59 and the corresponding positions on the two-in-one filter board 6, and then electrically connect it with the high-voltage copper busbar 4 by soldering. Fix the rubber pad 10 on the boss structure corresponding to the shielding cover 9 by dispensing glue.

[0058] At this point, the present invention is assembled and installed in the corresponding motor controller, the positive and negative ports are connected to the high-voltage busbar of the vehicle, the ground terminal is connected to the support 5, and the positive and negative output ports are connected to the power unit in the motor controller, so that the designed electromagnetic compatibility effect can be achieved. The shielding cover 9 is bolted to the support 5 to form a shielding space, which effectively cuts off the spatial coupling path of electromagnetic interference.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A filter for a vehicle drive motor system, characterized in that: The invention comprises a common-mode magnetic ring group, a front noise filtering capacitor group, a rear noise filtering capacitor group, a high-voltage copper busbar (4) and a support (5), wherein the common-mode magnetic ring group is installed in the support (5), and the front noise filtering capacitor group and the rear noise filtering capacitor group are installed on one side of the support (5); the high-voltage copper busbar (4) passes through the common-mode magnetic ring group; the common-mode magnetic ring group comprises a primary magnetic core (11), a secondary magnetic core (12) and a tertiary magnetic core (13) or comprises two of the primary magnetic core (11), the secondary magnetic core (12) and the tertiary magnetic core (13); the front noise filtering capacitor group and the rear noise filtering capacitor group are connected in parallel to the high-voltage copper busbar, or one end of the front noise filtering capacitor group and the rear noise filtering capacitor group is connected to the high-voltage copper busbar and the other end is grounded.

2. A filter for a vehicle-mounted drive motor system according to claim 1, characterized in that: The front noise filtering capacitor group and the rear noise filtering capacitor group are integrated into a two-in-one filter board (6); the front noise filtering capacitor group includes a front X capacitor (21) and at least two front Y capacitor components; the rear noise filtering capacitor group includes a rear X capacitor (31) and at least two rear Y capacitor components; the front X capacitor (21) and the rear X capacitor (31) are connected in parallel to the high-voltage copper busbar; At least one front Y capacitor component and at least one rear Y capacitor component are both connected to the positive electrode of the high-voltage copper busbar (4) at one end, and the other end is grounded; at least one front Y capacitor component and at least one rear Y capacitor component are both connected to the negative electrode of the high-voltage copper busbar (4) at one end, and the other end is grounded.

3. A filter for a vehicle-mounted drive motor system according to claim 2, characterized in that: The front Y capacitor assembly comprises a front Y capacitor (22) and a front damping resistor (23) connected in series; the rear Y capacitor assembly comprises a rear Y capacitor (32) and a rear damping resistor (33) connected in series; the two-in-one filter board (6) has a front X capacitor (21), a front Y capacitor (22), a rear X capacitor (31) and a rear Y capacitor (32) arranged on one side, and a front damping resistor (23) and a rear damping resistor (33) arranged on the other side.

4. A filter for a vehicle-mounted drive motor system according to claim 2, characterized in that: The two-in-one filter board (6) and the high-voltage copper busbar (4) are welded via a PIN pin (7); and the GND end (61) of the two-in-one filter board (6) is connected to the support (5) via a bolt (8).

5. The filter for a vehicle-mounted drive motor system according to claim 1, characterized in that: The primary magnetic core (11), the secondary magnetic core (12) and the tertiary magnetic core (13) are each made of manganese-zinc ferrite or nickel-zinc ferrite, and the inner diameters of the primary magnetic core (11), the secondary magnetic core (12) and the tertiary magnetic core (13) are greater than or equal to the width of the high-voltage copper busbar (4).

6. The filter for a vehicle-mounted drive motor system according to claim 1, characterized in that: The support (5) is divided into a copper bar installation position and three magnetic core installation slots by a baffle; a mounting hole is provided in the copper bar installation position; the high-voltage copper bar (4) is installed in the copper bar installation position, and the two or three magnetic cores of the common mode magnetic ring group are installed in different magnetic core installation slots.

7. A filter for a vehicle-mounted drive motor system according to claim 6, characterized in that: The high-voltage copper bar (4) comprises a positive front copper bar (41) and a positive rear copper bar (42) connected to each other, and a negative front copper bar (43) and a negative rear copper bar (44) connected to each other; the copper bar installation position comprises a front copper bar installation position (51) and a rear copper bar installation position (52) respectively located on both sides of the support (5) and divided into two parts by a retaining wall (50) inside, the two parts of the front copper bar installation position (51) respectively installing the positive front copper bar (41) and the negative front copper bar (43), and the two parts of the rear copper bar installation position (52) respectively installing the positive rear copper bar (42) and the negative rear copper bar (44).

8. The filter for a vehicle-mounted drive motor system according to claim 7, characterized in that: The high-voltage copper busbar (4) comprises two positive electrode welding terminals (45) and two negative electrode welding terminals (46), wherein the two positive electrode welding terminals (45) are respectively laser welded to the positive electrode front copper busbar (41) and the positive electrode rear copper busbar (42); and the two negative electrode welding terminals (46) are respectively laser welded to the negative electrode front copper busbar (43) and the negative electrode rear copper busbar (44).

9. The filter for a vehicle-mounted drive motor system according to claim 7, characterized in that: The support (5) is a rectangular parallelepiped, and the three magnetic core installation slots include a racetrack-shaped magnetic core slot (53), a secondary U-shaped magnetic core slot (54), and a tertiary U-shaped magnetic core slot (55); the racetrack-shaped magnetic core slot (53) and the front copper busbar installation position (51) are arranged on both sides of one end of the support (5) along the width direction of the support (5); the secondary U-shaped magnetic core slot (54), the tertiary U-shaped magnetic core slot (55), and the rear copper busbar installation position (52) are arranged on the other end of the support (5) along the length direction of the support (5).

10. The filter for a vehicle-mounted drive motor system according to claim 6, characterized in that: The filter also includes a shielding cover (9), which is mounted on one side of the support (5) and forms a closed copper bar mounting position and three magnetic core mounting slots with the baffle; a rubber pad (10) is provided on the surface of the shielding cover (9) in contact with the support (5).

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