CN216016715U - Multistage EMI filter for motor controller - Google Patents
Multistage EMI filter for motor controller Download PDFInfo
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- CN216016715U CN216016715U CN202121895814.8U CN202121895814U CN216016715U CN 216016715 U CN216016715 U CN 216016715U CN 202121895814 U CN202121895814 U CN 202121895814U CN 216016715 U CN216016715 U CN 216016715U
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Abstract
The utility model discloses a multistage EMI filter for a motor controller, which comprises an injection molding body, a negative copper bar, a positive copper bar, a magnetic core, a filter capacitor and a plurality of grounding copper bars, wherein the negative copper bar, the positive copper bar and the plurality of grounding copper bars are respectively installed on the injection molding body, the negative copper bar is provided with a first heat dissipation surface, and the positive copper bar is provided with a second heat dissipation surface. The utility model discloses a multistage EMI filter for a motor controller, which is mainly used for connecting a motor controller power module and an external direct current interface through a current-carrying copper bar, carrying out EMI filtering and providing a heat dissipation surface of the copper bar.
Description
Technical Field
The utility model belongs to the technical field of filters for motor controllers, and particularly relates to a multistage EMI filter for a motor controller.
Background
In the electric drive power assembly of the new energy automobile, a motor controller controls and drives a motor to operate through power modules such as an IGBT (insulated gate bipolar transistor), and the like, and the higher working frequency of the power modules determines that electromagnetic filtering needs to be performed in a certain frequency range through a filtering device, so that the good EMC (electro Magnetic compatibility) performance, namely the electromagnetic compatibility performance of the electric drive system is ensured. With the development of electric vehicles, the requirement for electromagnetic compatibility is also higher and higher.
The existing filter device mainly comprises a current-carrying copper bar, a magnetic ring, a capacitor, a Printed Circuit Board (PCB), an injection molding structural part and the like, has the problems of large space size, loose structure, difficult assembly and the like, and particularly has higher requirements on arrangement space because a multistage filter needs to integrate more types of components.
At present, a multistage filter mostly adopts a sectional type current-carrying copper bar, and the magnetic cores are connected in a high-power welding mode after being assembled; each stage of filter capacitor is arranged and electrically connected by utilizing the PCB; the current-carrying copper bar is electrically connected with the PCB through a switching part and a wave soldering process or is connected with the PCB through a screw; the filter is integrally encapsulated to fix and integrate the magnetic core, the PCB, the current-carrying copper bar, the electronic device and other parts.
The problems of the technology are as follows:
firstly, a plurality of molds are needed for producing the sectional current-carrying copper bar, and the molds are required to be put into more at one time; and an additional process is needed for connection, the process is complex, and the cost is high.
Secondly, the filter capacitors at all levels are connected through the PCB, so that the grounding path is possibly longer, and the EMC effect is not facilitated; and more processes such as wave soldering, PCB (printed circuit board) manufacturing process and the like are introduced in the production process, so that the supply chain management and quality control are not facilitated.
And thirdly, the current-carrying copper bar is connected with the filter capacitor through the switching part to cause more contact interfaces on an electric connection path, the contact resistance is higher, and the EMC effect is not utilized.
Fourthly, the whole pouring sealant is adopted to ensure the fixation and the electrical insulation of the parts, so that the investment of larger fixed equipment is needed, and the process needs higher quality control cost.
Fifthly, the auxiliary materials such as the pouring sealant and the bonding adhesive need to be cured under specific conditions, the operation of the next stage can be performed after a certain curing time is needed in the production process, and a specific carrier or a curing storage place is needed, so that additional production cost is brought.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a multistage EMI filter for a motor controller, which is mainly used for connecting a motor controller power module and an external direct current interface through a current-carrying copper bar, carrying out EMI filtering and providing a heat dissipation surface of the copper bar.
In order to achieve the above object, the present invention provides a multistage EMI filter for a motor controller, including an (integrally formed) injection molded body, a negative copper bar, a positive copper bar, a magnetic core, a filter capacitor, and a plurality of ground copper bars, wherein:
the negative copper bar, the positive copper bar and the plurality of grounding copper bars are respectively arranged on the injection molding body, the negative copper bar is provided with a first heat dissipation surface, and the positive copper bar is provided with a second heat dissipation surface;
the injection molding body is provided with a magnetic core mounting position and a capacitor mounting position, the magnetic core is mounted in the magnetic core mounting position, the filter capacitor is mounted in the capacitor mounting position, and a filter lead of the filter capacitor is respectively electrically connected with the negative copper bar, the positive copper bar and the grounding copper bar through resistance welding.
As a further preferred technical solution of the above technical solution, the magnetic core includes a first magnetic core and a second magnetic core, the first magnetic core and the second magnetic core are respectively installed on the injection molding body, and the negative copper bar and the positive copper bar are respectively and sequentially penetrated through the first magnetic core and the second magnetic core (through different penetrating openings).
As a further preferable technical solution of the above technical solution, the filter capacitors include a first common-mode filter capacitor, a second common-mode filter capacitor, a third common-mode filter capacitor, and a differential-mode filter capacitor, where:
the first common-mode filter capacitor is located between the first magnetic core and the second magnetic core, the second common-mode capacitor is located on a side of the first magnetic core away from the second secondary magnetic core, the third common-mode capacitor is located on a side of the second magnetic core away from the first magnetic core, and the differential-mode filter capacitor is located between first common-mode filter capacitors (each common-mode filter capacitor includes two capacitors).
As a further preferred technical solution of the above technical solution, capacitance leads of the first common-mode filter capacitor, the second common-mode filter capacitor and the third common-mode filter capacitor are respectively welded to the positive copper bar, the negative copper bar and the ground copper bar, and capacitance leads of the differential-mode filter capacitor are respectively welded to the positive copper bar and the negative copper bar.
As a further preferable technical solution of the above technical solution, the multistage EMI filter for a motor controller further includes a first magnetic core pressure plate and a second magnetic core pressure plate, the first magnetic core pressure plate fixes the first magnetic core to the injection molded body through a fastening structure, and the second magnetic core pressure plate fixes the second magnetic core to the injection molded body through a fastening structure.
The utility model has the beneficial effects that:
1. the multi-stage filter can better inhibit multi-channel conducted interference brought by a power device; the filter is modularized by integral injection molding design, and the manufacturability of the product is improved;
2. the electric insulation and the fixation of components are ensured through the self material and structural design of the injection molding body, the use of encapsulating materials is avoided, and the process complexity and the equipment investment are reduced;
3. the heat dissipation surface provided by the current-carrying copper bar can dissipate heat for the filter through the auxiliary heat conduction material, and the current-carrying capacity of the filter can be provided, so that the filter is suitable for a motor controller with higher power;
4. the filter capacitor lead is directly welded to the positive and negative electrode busbars and the grounding copper bar through low-power resistance welding, so that the length of a grounding path can be reduced to the maximum extent, stray inductance is reduced, and a better filtering effect is realized;
5. the auxiliary fixing adhesive of the capacitor and the magnetic core is positioned inside the injection molding body structure, and can be cured at normal temperature after the filter is assembled, and extra curing time, curing carriers and storage sites are not needed in the production process.
Drawings
Fig. 1 is a schematic structural diagram of a multistage EMI filter for a motor controller according to the present invention.
Fig. 2 is a schematic structural diagram of a multistage EMI filter for a motor controller according to the present invention.
Fig. 3 is a schematic structural diagram of a multistage EMI filter for a motor controller according to the present invention.
Fig. 4 is a schematic structural diagram of a multistage EMI filter for a motor controller according to the present invention.
The reference numerals include: 1. a negative copper bar; 11. a first heat dissipation surface; 2. a positive copper bar; 21. a second heat dissipation surface; 31. a first magnetic core pressing plate; 32. a second magnetic core pressing plate; 4. a first common-mode filter capacitor; 5. a differential mode filter capacitor; 6. a first magnetic core 7, a second magnetic core; 8. a third common mode filter capacitor; 9. a ground copper bar; 12. a second common mode filter capacitor; 13. pressing and riveting the nut; 14. and (3) injection molding.
Detailed Description
The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
The utility model discloses a multistage EMI filter for a motor controller, and the specific embodiment of the utility model is further described below by combining with the preferred embodiment.
In the embodiments of the present invention, those skilled in the art note that the negative electrode copper bar, the positive electrode copper bar, the ground copper bar, and the like according to the present invention can be regarded as the prior art.
Preferred embodiments.
The utility model discloses a multistage EMI filter for a motor controller, which comprises an injection molding body 14, a negative copper bar 1, a positive copper bar 2, a magnetic core, a filter capacitor and a plurality of grounding copper bars 9, wherein the injection molding body is integrally molded, and the filter capacitor comprises:
the negative copper bar 1, the positive copper bar 2 and the plurality of grounding copper bars 9 are respectively arranged on the injection molding body 14, the negative copper bar 1 is provided with a first heat dissipation surface 11, and the positive copper bar 2 is provided with a second heat dissipation surface 21;
the injection molding body 14 is provided with a magnetic core mounting position and a capacitor mounting position, the magnetic core is mounted in the magnetic core mounting position, the filter capacitor is mounted in the capacitor mounting position, and a filter lead of the filter capacitor is electrically connected with the negative copper bar 1, the positive copper bar 2 and the grounding copper bar 9 through resistance welding respectively.
Specifically, the magnetic core includes first magnetic core 6 and second magnetic core 7, first magnetic core 6 with second magnetic core 7 equally divide do not install in injection molding 14 and negative pole copper bar 1 with anodal copper bar 2 equally divide do not (through the different through-holes) run through in proper order first magnetic core 6 with second magnetic core 7.
More specifically, the filter capacitors include a first common-mode filter capacitor 4, a second common-mode filter capacitor 12, a third common-mode filter capacitor 8, and a differential-mode filter capacitor 5, where:
the first common-mode filter capacitor 4 is located between the first magnetic core 6 and the second magnetic core 7, the second common-mode capacitor 12 is located on a side of the first magnetic core 6 away from the second magnetic core 7 and the third common-mode capacitor 8 is located on a side of the second magnetic core 7 away from the first magnetic core 6, and the differential-mode filter capacitor 5 is located between the first common-mode filter capacitors 4 (each common-mode filter capacitor includes two capacitors).
Further, the capacitor leads of the first common-mode filter capacitor 4, the second common-mode filter capacitor 12 and the third common-mode filter capacitor 8 are respectively welded to the positive copper bar 2, the negative copper bar 1 and the ground copper bar 9, and the capacitor lead of the differential-mode filter capacitor 5 is respectively welded to the positive copper bar 2 and the negative copper bar 1.
Furthermore, the multistage EMI filter for a motor controller further includes a first core pressing plate 31 and a second core pressing plate 32, where the first core pressing plate 31 fixes the first core 6 to the injection molded body 14 by a snap structure, and the second core pressing plate 32 fixes the second core 7 to the injection molded body 14 by a snap structure.
Fig. 3 and 4 show the injection molded part 14 hidden.
Preferably, the multistage EMI filter for a motor controller is further provided with a clinch nut 13.
Preferably, the integral molding of the filter is realized through an insert injection molding process, two current-carrying copper bars (an anode copper bar and a cathode copper bar) and a plurality of grounding copper bars are integrated, the electrical insulation is ensured through the structural design, the installation characteristics of a capacitor and a magnetic core are provided on an injection molding body, and the two current-carrying copper bars respectively comprise a heat dissipation interface;
the first magnetic core and the second magnetic core both adopt two pairs of E/I magnetic cores, wherein the I-shaped magnetic core is assembled in an injection molding body from the side surface, the E-shaped magnetic core is assembled from the upper part, and the two magnetic cores are in contact fit to ensure a certain air gap, so that the common-mode integrated inductance function is realized, and in addition, the filtering function of two different frequency bands can be realized by changing the size and the material of the two pairs of E/I magnetic cores in design; after being assembled to the injection molding body, the two magnetic core pressing plates are respectively fixed on the injection molding body through the buckle structures.
The current-carrying copper bar and the grounding copper bar are formed by a stamping process, have a plurality of fork-shaped welding characteristics and are connected with a filter capacitor lead by low-power resistance welding; common-mode filter capacitors are respectively arranged at the front end and the rear end of the magnetic core, 3 pairs in total are arranged, and capacitor leads are respectively connected with the welding characteristics of a current-carrying copper bar and a grounding copper bar; a differential mode filter capacitor is arranged between the two pairs of magnetic cores, and leads of the differential mode filter capacitor are respectively connected with a positive busbar and a negative busbar; all capacitors adopt dry-type thin film capacitors.
The magnetic core and the capacitor are fixed with the injection molding body by the aid of adhesive cement, the adhesive cement is located in the installation characteristic inside the injection molding body, and the normal-temperature moisture curing silicon-based adhesive DC7091 commonly used in the industry is adopted.
Preferably, the installation mode of the utility model is as follows:
1. the filter main body structure is formed through an insert injection molding process and comprises a negative copper bar, a positive copper bar and a grounding copper bar;
2. on the basis, a first common-mode filter capacitor, a differential-mode filter capacitor, a third common-mode filter capacitor and a second common-mode filter capacitor are assembled;
3. the connection of each filter capacitor with a current-carrying copper bar and a grounding copper bar is realized through a low-power resistance welding process;
4. on this basis, two pairs of magnetic cores are assembled, and finally two magnetic core pressing plates are installed.
It should be noted that the technical features of the negative electrode copper bar, the positive electrode copper bar, the ground copper bar and the like related to the present patent application should be regarded as the prior art, the specific structure, the working principle, the control mode and the spatial arrangement mode of the technical features may be conventional choices in the field, and should not be regarded as the utility model point of the present patent, and the present patent is not further specifically described in detail.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a machine controller is with multistage EMI wave filter, its characterized in that, includes injection molding, negative pole copper bar, anodal copper bar, magnetic core, filter capacitor and a plurality of ground connection copper bar, wherein:
the negative copper bar, the positive copper bar and the plurality of grounding copper bars are respectively arranged on the injection molding body, the negative copper bar is provided with a first heat dissipation surface, and the positive copper bar is provided with a second heat dissipation surface;
the injection molding body is provided with a magnetic core mounting position and a capacitor mounting position, the magnetic core is mounted in the magnetic core mounting position, the filter capacitor is mounted in the capacitor mounting position, and a filter lead of the filter capacitor is respectively electrically connected with the negative copper bar, the positive copper bar and the grounding copper bar through resistance welding.
2. The multilevel EMI filter for a motor controller of claim 1, wherein the magnetic core comprises a first magnetic core and a second magnetic core, the first magnetic core and the second magnetic core are respectively mounted on the injection molded body, and the negative copper bar and the positive copper bar respectively penetrate through the first magnetic core and the second magnetic core sequentially.
3. The multi-stage EMI filter for an electrical machine controller of claim 2, wherein the filter capacitors comprise a first common-mode filter capacitor, a second common-mode filter capacitor, a third common-mode filter capacitor, and a differential-mode filter capacitor, wherein:
the first common-mode filter capacitor is located between the first magnetic core and the second magnetic core, the second common-mode capacitor is located on one side, away from the second magnetic core, of the first magnetic core, the third common-mode capacitor is located on one side, away from the first magnetic core, of the second magnetic core, and the differential-mode filter capacitor is located between the first common-mode filter capacitors.
4. The multistage EMI filter for motor controllers as set forth in claim 3, wherein said capacitor leads of said first common mode filter capacitor, said second common mode filter capacitor and said third common mode filter capacitor are respectively soldered to said positive copper bar, said negative copper bar and said ground copper bar, and said capacitor leads of said differential mode filter capacitor are respectively soldered to said positive copper bar and said negative copper bar.
5. The multilevel EMI filter for a motor controller of claim 4, further comprising a first core pressing plate and a second core pressing plate, wherein the first core pressing plate fixes the first core to the injection molded body by a snap structure, and the second core pressing plate fixes the second core to the injection molded body by a snap structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121895814.8U CN216016715U (en) | 2021-08-13 | 2021-08-13 | Multistage EMI filter for motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121895814.8U CN216016715U (en) | 2021-08-13 | 2021-08-13 | Multistage EMI filter for motor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216016715U true CN216016715U (en) | 2022-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121895814.8U Active CN216016715U (en) | 2021-08-13 | 2021-08-13 | Multistage EMI filter for motor controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216016715U (en) |
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2021
- 2021-08-13 CN CN202121895814.8U patent/CN216016715U/en active Active
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