A multi-stage filtering structure, motor controller and vehicle

Abstract

The present invention discloses a multi-stage filtering structure, a motor controller and a vehicle. The multi-stage filtering structure is fixed at the DC end in the housing of the controller. The head end of the DC end is a high-voltage busbar, and the end end is a film capacitor. The structure includes a primary filter fixing seat assembly and a secondary filter fixing seat assembly. The primary filter fixing seat assembly and the secondary filter fixing seat assembly are arranged in the housing of the controller. The input end of the high-voltage busbar is correspondingly connected to the positive and negative input ends of the primary filter fixing seat assembly. The positive and negative output ends of the primary filter fixing seat assembly are respectively correspondingly connected to the positive and negative input ends of the secondary filter fixing seat assembly. The positive and negative output ends of the secondary filter fixing seat assembly are respectively correspondingly connected to the positive and negative input ends of the film capacitor. By integrating and modularizing a plurality of filter components together, it is ensured that the EMC capability of the DC end of the controller is maximized within a limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of motor controllers, and in particular to a multi-stage filtering structure, a motor controller having the multi-stage filtering structure, and a vehicle having the motor controller. Background Art

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to work normally in its electromagnetic environment and not cause any electromagnetic disturbance that cannot be tolerated by anything in the environment. According to the definition of EMC, electronic equipment must meet EMC design indicators. On the one hand, it is necessary to ensure that the electronic equipment has a certain degree of immunity to the electromagnetic interference in the environment in which it is located, and on the other hand, it is required that the electromagnetic interference generated by the electronic equipment to the environment in the process of operation does not exceed the specified limit.

[0003] The automotive motor controller is a typical electronic device, on which electronic components such as connecting wiring harnesses, PCBs, power modules and capacitor modules are arranged. When designing an EMC solution, the general design idea is to add filtering components such as magnetic rings and magnetic buckles at the DC end and the three-phase end, and to add filtering capacitors, shielding covers, grounding designs and other measures to the filter PCB on the transmission path. In order to meet the EMC design indicators, as many filtering components as possible are arranged in a limited space to improve the filtering level.

[0004] When designing the EMC of the controller DC end (direct current end), the traditional design method is to add a number of large and small filter capacitors, magnetic rings, magnetic buckles, filter circuit boards and other filter components in the current transmission path. However, the traditional EMC design method has two disadvantages: on the one hand, since these filter components are independent individuals, a part of the space must be freed up to fix the components during installation. When there are enough filter components, the space for accommodating the filter module at the controller DC end will be enlarged, the design space of the DC / AC end will be compressed, and the design difficulty will be significantly increased; on the other hand, the filter components are independent individuals, the degree of integration of the filter module is low, the installation process is cumbersome, the production cycle of the controller product will be extended, and the production efficiency will be significantly reduced. Summary of the invention

[0005] In view of at least one of the above-mentioned technical problems, the purpose of the present invention is to provide a multi-stage filter structure, a motor controller and a vehicle, wherein the secondary filter fixing seat assembly does not have a filter circuit board structure, and the structure is simplified. At the same time, a magnetic ring is used to replace the magnetic core, so that the primary filter fixing seat assembly and the secondary filter fixing seat assembly are combined into one, and a modular design is adopted, with a novel structure. By integrating a large number of filter components together through an integrated and modular design, it can be ensured that the EMC capability of the controller DC end is maximized within a limited space.

[0006] The technical solution of the present invention is:

[0007] One of the purposes of the present invention is to provide a multi-stage filter structure, which is fixed at a DC end in a controller housing, wherein the first end of the DC end is a high voltage bus and the end is a film capacitor, wherein the multi-stage filter structure comprises a primary filter fixing seat assembly and a secondary filter fixing seat assembly, wherein the primary filter fixing seat assembly and the secondary filter fixing seat assembly are arranged in the controller housing;

[0008] The input end of the high-voltage busbar is connected to the positive and negative input ends of the primary filter fixing seat assembly; the positive and negative output ends of the primary filter fixing seat assembly are connected to the positive and negative input ends of the secondary filter fixing seat assembly respectively;

[0009] The positive and negative output terminals of the secondary filter fixing seat assembly are respectively connected to the positive and negative input terminals of the film capacitor.

[0010] Optionally, the primary filter fixing seat assembly includes a first injection molded part housing and a first filter component; the first injection molded part housing has a first positive copper bar, a first negative copper bar and a first groove; the first filter component includes a first magnetic core and a filter circuit, and the first magnetic core is fixed in the first groove;

[0011] The secondary filter fixing seat assembly comprises a second injection molded part housing and a second filter device; the second injection molded part housing comprises a second positive copper bar, a second negative copper bar, a grounding copper bar and a plurality of second grooves;

[0012] The second filter device includes a magnetic ring, a second magnetic core, four second Y capacitors and a second X capacitor;

[0013] The second magnetic core is located between the four second Y capacitors; the magnetic ring is fixed in a second groove on a side of the second injection molded part housing close to the primary filter fixing seat assembly.

[0014] Optionally, two first via holes are provided on the upper portion of the first magnetic core, and the two first via holes pass through the first positive copper bar and the first negative copper bar respectively;

[0015] Two second via holes are arranged on the upper part of the second magnetic core, and the two second via holes pass through the second positive copper bar and the second negative copper bar respectively;

[0016] A magnetic ring through hole is arranged in the middle of the magnetic ring, and the magnetic ring through hole passes through the second positive copper bar and the second negative copper bar.

[0017] Optionally, the first magnetic core consists of an E-type magnetic core and an I-type magnetic core;

[0018] The second magnetic core is composed of an E-type magnetic core and an I-type magnetic core.

[0019] Optionally, the first magnetic core is fixed in the first groove on a side of the first injection molded part housing away from the secondary filter fixing seat assembly by potting;

[0020] The magnetic ring is fixed to a side of the second injection molded part housing close to the primary filter fixing seat assembly by means of glue pouring or glue dispensing and sealing; and / or

[0021] The second magnetic core is fixed in the second groove on the side of the second injection molded part housing away from the primary filter fixing seat assembly by potting.

[0022] Optionally, the input end of the high-voltage bus is connected to the positive and negative input ends of the primary filter fixing seat assembly by screw locking;

[0023] The positive and negative output ends of the primary filter fixing seat assembly are respectively connected to the positive and negative input ends of the secondary filter fixing seat assembly by screw locking;

[0024] The positive and negative output ends of the secondary filter fixing seat assembly are respectively connected to the positive and negative input ends of the film capacitor by screw locking.

[0025] Optionally, the filtering circuit includes a circuit board and two first X capacitors and two first Y capacitors arranged on the circuit board;

[0026] Four mounting holes are provided around the circuit board, two of which are power-taking ends, and the other two are grounding ends. The power-taking ends are correspondingly overlapped with the first positive copper bar and the first negative copper bar to take power from the two poles of the first X capacitor and the first level of the first Y capacitor; the grounding end is overlapped with the controller housing to ground the other pole of the first Y capacitor.

[0027] The two first X capacitors are arranged at intervals, and the two first Y capacitors are symmetrically arranged on both sides of one of the first X capacitors.

[0028] Optionally, the four second Y capacitors and the one second X capacitor are embedded in the remaining second grooves in the second injection molded part housing, wherein two second Y capacitors are arranged side by side on a side of the second injection molded part housing away from the primary filter fixing seat assembly, and the remaining two second Y capacitors and the one second X capacitor are arranged side by side on a side of the second injection molded part housing close to the primary filter fixing seat assembly and close to the magnetic ring;

[0029] The second positive copper bar and the second negative copper bar are respectively led out with power-taking welding pins, and the grounding copper bar is led out with a grounding welding pin. The power-taking welding pins are welded and fixed to the power-taking pins on the second X capacitor and the second Y capacitor to take power from the second X capacitor and the second Y capacitor; the grounding welding pin is welded and fixed to the grounding pin on the second Y capacitor to ground the second Y capacitor.

[0030] Another object of the present invention is to provide a motor controller, comprising the multi-stage filtering structure described in any one of the above items.

[0031] Another object of the present invention is to provide a vehicle, comprising the above-mentioned motor controller.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] The multi-stage filter structure of the present invention has no filter circuit board structure in the secondary filter fixing seat assembly, and the structure is simplified. At the same time, the magnetic ring replaces the magnetic core, so that the primary filter fixing seat assembly and the secondary filter fixing seat assembly are combined into one, and a modular design is adopted, which has a novel structure. By integrating a plurality of filter components together through an integrated and modular design, it can be ensured that the EMC capability of the DC end of the controller is improved to the greatest extent within a limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0035] Figure 1 It is a schematic diagram of the installation structure of the multi-stage filtering structure of an embodiment of the present invention in the controller housing;

[0036] Figure 2 It is a structural schematic diagram of a first-stage filter fixing seat assembly of a multi-stage filter structure according to an embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of a first magnetic core or a second magnetic core of a first-stage filter fixing seat assembly of a multi-stage filter structure according to an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of a filter circuit of a first-stage filter fixing seat assembly of a multi-stage filter structure according to an embodiment of the present invention;

[0039] Figure 5 A structural schematic diagram of a secondary filter fixing seat assembly of a multi-stage filter structure according to an embodiment of the present invention;

[0040] Figure 6 It is a structural schematic diagram of the magnetic ring of the secondary filter fixing seat assembly of the multi-stage filter structure of an embodiment of the present invention.

[0041] Among them: 1. primary filter fixing seat assembly; 2. secondary filter fixing seat assembly; 3. first positive input terminal; 4. first negative input terminal; 5. first positive output terminal; 6. first negative output terminal; 7. second positive input terminal; 8. second negative input terminal; 9. second positive output terminal; 10. second negative output terminal; 11a. first magnetic core; 11b. second magnetic core; 12. filter circuit; 13. magnetic ring; 14. power supply terminal; 15. grounding terminal; 16. power supply welding foot; 17. grounding welding foot; 18. E-type magnetic core; 19. I-type magnetic core; 20a. first X capacitor; 20b. second X capacitor; 21a. first Y capacitor; 21b. second Y capacitor; 22. controller housing; 23. high-voltage bus; 24. film capacitor. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0043] Example:

[0044] See also Figures 1 to 6 A multi-stage filtering structure of an embodiment of the present invention is fixed at the DC end in the controller housing 22, that is, the DC end, and the first end of the DC end is also as shown in FIG. Figure 1 The upper right side is the high voltage bus 23, and the end is Figure 1 The lower end shown is a film capacitor 24. The multi-stage filter structure includes a primary filter fixing seat assembly 1 and a secondary filter fixing seat assembly 2. The primary filter fixing seat assembly 1 and the secondary filter fixing seat assembly 2 are arranged horizontally in the controller housing 22. Figure 1 As shown, the left side of the controller housing 22 is the primary filter fixing seat assembly 1, and the right side of the controller housing 22 is the secondary filter fixing seat assembly 2. The two are arranged horizontally from left to right, which can well control the design space of the DC end EMC.

[0045] The input end of the high-voltage busbar 23 is connected to the positive and negative input ends of the primary filter fixture assembly 1. The positive and negative output ends of the primary filter fixture assembly 1 are connected to the positive and negative input ends of the secondary filter fixture assembly 2. The positive and negative output ends of the secondary filter fixture assembly 2 are connected to the positive and negative input ends of the film capacitor 24. Specifically, Figure 1As shown, the input end of the high-voltage busbar 23 is connected to the positive and negative input ends of the primary filter fixing seat assembly 1 by screw locking. The positive and negative output ends of the primary filter fixing seat assembly 1 are respectively connected to the positive and negative input ends of the secondary filter fixing seat assembly 2 by screw locking. The positive and negative output ends of the secondary filter fixing seat assembly 2 are respectively connected to the positive and negative input ends of the film capacitor 24 by screw locking.

[0046] like Figures 2 to 4 As shown, the primary filter fixing seat assembly 1 includes a first injection molded part shell and a first filter element. The first injection molded part shell is roughly square, and the first injection molded part shell has a first positive copper bar, a first negative copper bar and a plurality of first grooves (not shown in the figure). The two ends of the first positive copper bar are respectively the positive input terminal and the positive output terminal of the primary filter fixing seat assembly 1, and the two ends of the first negative copper bar are respectively the negative input terminal and the negative output terminal of the primary filter fixing seat assembly 1. For the convenience of description and distinction, the positive input terminal and the positive output terminal of the primary filter fixing seat assembly 1 are described herein as the first positive input terminal 3 and the first positive output terminal 5, respectively, and the negative input terminal and the negative output terminal of the primary filter fixing seat assembly 1 are described herein as the first negative input terminal 4 and the first negative output terminal 6, respectively. As shown Figure 2 As shown, the first positive input terminal 3 and the first negative input terminal 4 are arranged side by side at the right front end of the first injection molded part shell, and the first positive output terminal 5 and the first negative output terminal 6 are arranged side by side at the left front end of the first injection molded part shell.

[0047] The first filter device includes a first magnetic core 11a and a filter circuit 12. The first magnetic core 11a is fixed in the first groove and has two first vias. The two first vias pass through the first positive copper bar and the first negative copper bar respectively. It can effectively suppress differential mode or common mode interference. Figure 2 As shown, the first magnetic core 11a is arranged at the middle and rear end of the first injection molded part housing, and the first filter circuit 12 is arranged at the left end of the first injection molded part housing and at the rear end of the first positive output terminal 5 and the first negative output terminal 6. Figure 3 As shown, the first magnetic core 11a is composed of an E-type magnetic core 18 and an I-type magnetic core 19, and the open end of the E-type magnetic core 18 is fixed downward on the I-type magnetic core 19. In this embodiment, the circuit board is an existing conventional PCBA, namely a printed circuit board or printed circuit board.

[0048] More specifically, the filter circuit 12 includes a circuit board and two first X capacitors 20a and two first Y capacitors 21a disposed on the circuit board, the two first X capacitors 20a are disposed at intervals, and the two first Y capacitors 21a are symmetrically disposed on both sides of one of the first X capacitors 20a. Figure 4As shown, the circuit board is a square circuit board, a first X capacitor 20a with a larger size is arranged on the right rear side of the circuit board, another first X capacitor 20a with a smaller size is arranged on the left front side of the circuit board and has a gap with another first X capacitor 20a, and two first Y capacitors 21a are symmetrically arranged on the left and right sides of the first X capacitor 20a with a smaller size. Four mounting holes are provided around the circuit board, two of which are specifically two holes on both sides of the first X capacitor 20a with a larger size as the power-taking end 14, and the other two grounding ends 15, and the power-taking end 14 is overlapped with the first positive copper bar and the first negative copper bar, and is the first pole of the first X capacitor 20a and the first Y capacitor 21a. The grounding end 15 is overlapped with the controller housing 22, and the other pole of the Y capacitor is grounded. The first X capacitor 20a can effectively suppress differential mode interference, and the first Y capacitor 21a can effectively suppress common mode interference.

[0049] In some preferred embodiments, the first magnetic core 11a is fixed to the side of the first injection molded part housing away from the secondary filter fixing seat assembly 2 by potting. Figure 2 The first injection molded part is shown in the first groove on the left side of the housing.

[0050] like Figure 5 to Figure 6 As shown, the secondary filter fixing seat assembly includes a second injection molded housing and a second filter element. The second injection molded housing is also lateral. Figure 1 and Figure 5 The second injection molded part extends in the left and right directions as shown, and has a second positive copper bar, a second negative copper bar, a grounding copper bar and a plurality of second grooves (not shown in the figure). The two ends of the second positive copper bar are respectively the positive input terminal and the positive output terminal of the secondary filter fixing seat assembly 2, and the two ends of the second negative copper bar are respectively the negative input terminal and the negative output terminal of the secondary filter fixing seat assembly 2. For the convenience of description and distinction, the positive input terminal and the positive output terminal of the secondary filter fixing seat assembly 2 are described herein as the second positive input terminal 7 and the second positive output terminal 9, respectively, and the negative input terminal and the negative output terminal of the secondary filter fixing seat assembly 2 are described herein as the second negative input terminal 8 and the second negative output terminal 10, respectively. As Figure 5 As shown, the second positive input terminal 7 and the second negative input terminal 8 are arranged side by side on the left side of the second injection molded part housing, and the second positive output terminal 9 and the second negative output terminal 10 are arranged side by side on the right front end of the second injection molded part housing.

[0051] The second filter device includes a magnetic ring 13, a second magnetic core 11b, four second Y capacitors 21b and a second X capacitor 20b. Figure 5 and Figure 6 As shown, the magnetic ring 13 is an elliptical magnetic ring 13, and a magnetic ring 13 through hole is provided in the middle thereof, and the magnetic ring 13 through hole passes through the second positive copper bar and the second negative copper bar. Figure 5As shown, the magnetic ring 13 is fixed on the side of the second injection molded part housing close to the primary filter fixing seat assembly 1, that is, Figure 5 In a second groove (not shown in the figure) on the left side shown, the second groove is an elliptical groove matching the magnetic ring 13.

[0052] The second magnetic core 11b is encapsulated in the second injection molded part housing and has two second vias thereon, and the two second vias pass through the second positive copper bar and the second negative copper bar respectively. It can effectively suppress differential mode or common mode interference. The structure of the second magnetic core 11b is the same as that of the first magnetic core 11a, and is also composed of an E-type magnetic core 18 and an I-type magnetic core 19, and the open end of the E-type magnetic core 18 is fixed downward on the I-type magnetic core 19.

[0053] Four second Y capacitors 21b and one second X capacitor 20b are embedded in the remaining second grooves in the second injection molded part housing. Figure 5 As shown, the two second Y capacitors 21b are arranged side by side on the side of the second injection molded part housing away from the primary filter fixing seat assembly 1, that is, as shown in FIG. Figure 5 On the right side of the second injection molded part housing shown in FIG. 1 , the remaining two second Y capacitors 21 b and one second X capacitor 20 b are arranged side by side in the front, middle and back of the second injection molded part housing near the primary filter fixing seat assembly 1 and near the magnetic ring 13, that is, as shown in FIG. Figure 5 The left side of the second injection molded part housing shown is specifically the right side of the magnetic ring 13 .

[0054] like Figure 5 As shown, the second magnetic core 11b is located between the four second Y capacitors 21b, specifically, is arranged in the middle position of the second injection molded part housing.

[0055] The second positive copper bar and the second negative copper bar are respectively led out with a power supply welding pin 16, and the grounding copper bar is led out with a grounding welding pin 17. The power supply welding pin 16 is welded and fixed to the power supply pins on the second X capacitor 20b and the second Y capacitor 21b to supply power to the second X capacitor 20b and the second Y capacitor 21b. The grounding welding pin 17 is welded and fixed to the grounding pin on the second Y capacitor 21b to ground the second Y capacitor 21b. The second X capacitor 20b can effectively suppress differential mode interference, and the second Y capacitor 21b can effectively suppress common mode interference.

[0056] In some preferred embodiments, the magnetic ring 13 is fixed to one side of the second injection molded part housing close to the primary filter fixing seat assembly 1 by means of glue filling or glue dispensing and sealing. Figure 5 The second injection molded part is shown on the left side of the housing.

[0057] In some preferred embodiments, the second magnetic core 11b is fixed in the second groove on the side of the second injection molded part housing away from the primary filter fixing seat assembly 1 by potting. Figure 5The middle position of the second injection molded housing is shown.

[0058] In the embodiment of the present invention, there is no filter circuit board structure in the secondary filter fixing seat assembly 2, and the structure is simplified. At the same time, the magnetic ring 13 replaces the magnetic core to realize the integration of the primary filter fixing seat assembly 1 and the secondary filter fixing seat assembly 2 into one, adopting a modular design and having a novel structure.

[0059] The multi-stage filter structure of the embodiment of the present invention brings together many filter components through an integrated and modular design, which can ensure that the EMC capability of the controller DC end is maximized within a limited space. The multi-stage filter structure of the embodiment of the present invention can be made to meet different levels of EMC requirements such as level 3, level 4, and level 5 by adding or deleting filter capacitors, magnetic rings 13, magnetic cores, and filter circuit boards according to customer or cost requirements.

[0060] The embodiment of the present invention further provides a motor controller, including the multi-stage filtering structure of the above embodiment. Other structures and working principles in the motor controller are not described and limited in detail here, and are conventional structures.

[0061] An embodiment of the present invention further provides a vehicle, comprising the motor controller of the above embodiment.

[0062] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A multi-stage filter structure, fixed at the DC end in the controller housing (22), characterized in that: The head end of the DC end is a high-voltage busbar (23), and the tail end is a thin-film capacitor (24); the multi-stage filter structure comprises a primary filter fixing seat assembly (1) and a secondary filter fixing seat assembly (2); the primary filter fixing seat assembly (1) and the secondary filter fixing seat assembly (2) are arranged in the controller housing (22); The input end of the high-voltage busbar (23) is correspondingly connected to the positive and negative input ends of the primary filter fixing seat assembly (1); The positive and negative output terminals of the primary filter fixing seat assembly (1) are respectively connected to the positive and negative input terminals of the secondary filter fixing seat assembly (2); The positive and negative output terminals of the secondary filter fixing seat assembly (2) are respectively connected to the positive and negative input terminals of the thin film capacitor (24); The primary filter fixing seat assembly (1) comprises a first injection molded part housing and a first filter component; the first injection molded part housing comprises a first positive copper bar, a first negative copper bar and a first groove; the first filter component comprises a first magnetic core (11a) and a filter circuit (12); the first magnetic core (11a) is fixed in the first groove; The secondary filter fixing seat assembly (2) comprises a second injection molded part housing and a second filter component; the second injection molded part housing comprises a second positive copper bar, a second negative copper bar, a grounding copper bar and a plurality of second grooves; The second filter device comprises a magnetic ring (13), a second magnetic core (11b), four second Y capacitors (21b) and a second X capacitor (20b); The second magnetic core (11b) is located between the four second Y capacitors (21b); the magnetic ring (13) is fixed in a second groove on a side of the second injection molded part housing close to the primary filter fixing seat assembly (1); The input end of the high-voltage busbar (23) is connected to the positive and negative input ends of the primary filter fixing seat assembly (1) by means of screw locking; The positive and negative output ends of the primary filter fixing seat assembly (1) are respectively connected to the positive and negative input ends of the secondary filter fixing seat assembly (2) by means of screw locking; The positive and negative output ends of the secondary filter fixing seat assembly (2) are respectively connected to the positive and negative input ends of the film capacitor (24) by means of screw locking.

2. A multi-stage filtering structure according to claim 1, characterized in that: Two first via holes are arranged on the upper part of the first magnetic core (11a), and the two first via holes pass through the first positive copper bar and the first negative copper bar respectively; Two second via holes are arranged on the upper part of the second magnetic core (11b), and the two second via holes pass through the second positive copper bar and the second negative copper bar respectively; A magnetic ring through hole is provided in the middle of the magnetic ring (13), and the magnetic ring through hole passes through the second positive copper bar and the second negative copper bar.

3. A multi-stage filtering structure according to claim 1, characterized in that: The first magnetic core (11a) is composed of an E-type magnetic core (18) and an I-type magnetic core (19); The second magnetic core (11b) is composed of an E-type magnetic core (18) and an I-type magnetic core (19).

4. The multi-stage filtering structure according to claim 1, characterized in that: The first magnetic core (11a) is fixed in the first groove on the side of the first injection molded part housing away from the secondary filter fixing seat assembly (2) by potting; The magnetic ring (13) is fixed to a side of the second injection molded part housing close to the primary filter fixing seat assembly (1) by means of glue pouring or glue dispensing and sealing; and / or The second magnetic core (11b) is fixed in the second groove on the side of the second injection molded part housing away from the primary filter fixing seat assembly (1) by potting.

5. A multi-stage filtering structure according to claim 1, characterized in that: The filter circuit (12) comprises a circuit board and two first X capacitors (20a) and two first Y capacitors (21a) arranged on the circuit board; Four mounting holes are provided around the circuit board, two of which are power supply terminals (14), and the other two are ground terminals (15). The power supply terminals (14) are correspondingly connected to the first positive copper bar and the first negative copper bar to supply power to the two poles of the first X capacitor (20a) and the first level of the first Y capacitor (21a); ​​the ground terminal (15) is connected to the controller housing (22) to ground the other pole of the first Y capacitor (21a); The two first X capacitors (20a) are arranged at intervals, and the two first Y capacitors (21a) are symmetrically arranged on both sides of one of the first X capacitors (20a).

6. A multi-stage filtering structure according to claim 1, characterized in that: The four second Y capacitors (21b) and the one second X capacitor (20b) are embedded in the remaining second grooves in the second injection molded part housing, wherein two second Y capacitors (21b) are arranged side by side on a side of the second injection molded part housing away from the primary filter fixing seat assembly (1), and the remaining two second Y capacitors (21b) and the one second X capacitor (20b) are arranged side by side on a side of the second injection molded part housing close to the primary filter fixing seat assembly (1) and close to the magnetic ring (13); The second positive copper bar and the second negative copper bar are respectively led out with power supply welding pins (16), and the grounding copper bar is led out with a grounding welding pin (17). The power supply welding pin (16) is welded and fixed to the power supply pins on the second X capacitor (20b) and the second Y capacitor (21b) to supply power to the second X capacitor (20b) and the second Y capacitor (21b); and the grounding welding pin (17) is welded and fixed to the grounding pin on the second Y capacitor (21b) to ground the second Y capacitor (21b).

7. A motor controller, characterized in that: It comprises the multi-stage filtering structure as described in any one of claims 1 to 6.

8. A vehicle, characterized in that: Includes the motor controller as described in claim 7.

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