Oil-proof filter inductor for suppressing electromagnetic interference of power supply

Abstract

The utility model relates to a kind of oil-proof filter inductance for inhibiting power electromagnetic interference, including shell and UVW pole three copper bars in shell, the inductance cavity of accommodating annular inductance is equipped in the shell, the copper bar passes through annular inductance;Vertical side wall support rib is equipped on the side wall of the inductance cavity, bottom support rib is equipped on the bottom surface of the inductance cavity, annular inductance is erected on side wall support rib, bottom support rib, so that inductance cavity wall and annular inductance form glue injection gap, the inductance cavity is poured with epoxy resin and glue injection gap is infiltrated by epoxy resin;Sealing groove is further equipped on the outer connecting end of the copper bar.The utility model has the beneficial effect that: the sealing cover of outside, first sealing sleeve, epoxy resin have good insulation performance, can enhance the insulation capacity after being wrapped iron-based inductance, prevent the damage of oil to insulation performance, ensure that inductance can also maintain reliable insulation state in oil environment.

Description

Technical Field

[0001] This utility model relates to a filter inductor, particularly for suppressing electromagnetic interference from power supplies. Background Technology

[0002] An electromagnetic interference (EMI) filtering inductor is an electronic component used to suppress electromagnetic interference. It operates based on the principle of electromagnetic induction. When alternating current passes through the inductor's magnetic core coil, an alternating magnetic field is generated around the coil. This alternating magnetic field then acts on the current, impeding its change. According to Lenz's law, an inductor significantly impedes rapidly changing currents, especially high-frequency EMI signals. It converts these signals into magnetic energy, stores it, and then gradually releases it, thus filtering high-frequency interference and purifying the power supply signal.

[0003] To prevent vehicle malfunctions, electronic components in electric vehicles have extremely high anti-interference requirements. Filters are a common type of anti-interference electronic component and are widely used in electric vehicles.

[0004] Filters effectively suppress electromagnetic interference and noise, ensuring stable and reliable signal transmission between various electronic systems. In the complex electrical environment of electric vehicles, electromagnetic interference from components such as the motor, battery management system, and charger can affect the normal operation of critical electronic components. For example, interference with the in-vehicle communication system may lead to inaccurate navigation or interruption of communication with the outside world; interference with the control system may even cause serious consequences such as loss of vehicle control.

[0005] The main purpose of encapsulating a filter inductor is to protect the internal magnetic core and coil. However, if oily substances come into contact with the encapsulation for a long time, they can easily seep through the encapsulation layer along the edges of the copper busbar and the gaps in the encapsulation, and come into contact with the internal magnetic core and coil, thus accelerating the corrosion of the inductor. Utility Model Content

[0006] In order to overcome the shortcomings of current filter inductors used to suppress power supply electromagnetic interference, such as poor oil resistance and poor corrosion resistance, this utility model provides an oil-proof filter inductor for suppressing power supply electromagnetic interference.

[0007] The technical solution of this utility model to solve its technical problem is: an oil-proof filter inductor for suppressing electromagnetic interference of power supply, comprising a housing and three copper busbars (UVW poles) located inside the housing. The housing has an inductor cavity to accommodate a ring inductor, through which the copper busbars pass. The housing also has a copper busbar sheath to protect the copper busbars, which covers the middle of the copper busbars. The copper busbars have exposed external and internal connection ends on both sides. The sidewalls of the inductor cavity have vertical sidewall support ribs, and the bottom surface of the inductor cavity has bottom support ribs. The ring inductor is mounted on the sidewall support ribs and the bottom support ribs, thereby forming a glue injection gap between the inductor cavity wall and the ring inductor. The inductor cavity is filled with epoxy resin, and the glue injection gap is wetted by epoxy resin. The ring inductor is submerged in the epoxy resin. The outer connection end of the copper busbar also has a sealing groove, which is located within the opening of the end of the copper busbar sheath. To facilitate manufacturing, the cladding on the copper busbar is injection molded with a core. This manufacturing method creates a reinforced connection structure at the sealing groove, increasing the bonding strength between the cladding and the copper busbar and preventing oil and gas intrusion.

[0008] In a preferred embodiment of the sealing groove, the sealing groove on the copper busbar is three parallel grooves.

[0009] To further enhance sealing performance, the housing has a cavity cover mounting edge at the end of the inductor cavity, and a sealing cap is glued to the cavity cover mounting edge. The copper busbar cladding extends through the sealing cap. This prevents the epoxy resin from being directly exposed to oily substances.

[0010] Furthermore, a first sealing sleeve is provided on the copper busbar cladding at the point where it passes through the sealing cover, and a second sealing sleeve is also provided on the copper busbar cladding below the first sealing sleeve.

[0011] To prevent short circuits between adjacent copper busbars, the cladding of the middle copper busbar extends longer than the left and right busbars on the outer connection side.

[0012] To further enhance insulation performance, a side wall is provided at the end of the copper busbar cladding where it connects to the external connection end, and the side wall covers part of the side surface of the external connection end of the copper busbar.

[0013] The toroidal inductor is preferably selected from nanocrystalline inductors, and we use iron-based nanocrystalline material of 1K107B alloy.

[0014] The anti-break-circuit structure between the inner connection ends is preferably optimized, and the housing is provided with a partition plate between the inner connection ends of the copper busbar.

[0015] To increase the connection strength of the housing, a metal structural reinforcement is embedded in the connecting lug on the side of the housing.

[0016] Furthermore, the upper part of the copper busbar is provided with a U-shaped bend.

[0017] In use, this utility model is installed on a motor controller, with the external connection terminal connected in series with the power supply of the drive motor, and the internal connection terminal connected to the motor controller, which serves to suppress electromagnetic interference.

[0018] When installed on the interface of the motor controller, the outer ends of the first and second sealing sleeves abut against the interface, and the seal is assembled on the interface.

[0019] The specific operating principle is the same as that of existing filter inductors, and will not be repeated here.

[0020] The beneficial effects of this invention are as follows: 1. Oil and water corrosion can reduce the insulation performance of iron-based inductor windings, causing leakage and other problems, affecting the safety and stability of the circuit. The outer sealing cover, the first sealing sleeve, and the epoxy resin have good insulation properties. After wrapping the iron-based inductor, they can enhance its insulation ability, prevent oil from damaging the insulation performance, and ensure that the inductor maintains a reliable insulation state even in an oily environment. 2. The complete wrapping with epoxy resin effectively prevents oil from damaging the iron-based inductor, reducing various faults caused by oil, such as winding short circuits and core performance deterioration. This allows the iron-based inductor to work more stably in an oily environment, reducing the frequency of maintenance and replacement, thereby extending the inductor's service life and providing a guarantee for the long-term stable operation of the equipment. 3. The inductor using 1K107B alloy iron-based nanocrystalline material has good chemical stability and can resist oil corrosion. On the other hand, the iron-based nanocrystalline material has excellent broadband characteristics and can better suppress interference signals of different frequencies. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of one embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of another embodiment of the present invention from another angle.

[0023] Figure 3 This is a cross-sectional schematic diagram of one embodiment of the present invention.

[0024] Figure 4 This is an exploded view of one embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the housing of one embodiment of the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1 Combined with appendix Figures 1 to 5An oil-resistant filter inductor for suppressing electromagnetic interference in a power supply includes a housing 1 and three copper busbars 2 (UVW poles) located inside the housing 1. The housing 1 has an inductor cavity 4 that accommodates a ring inductor 3, through which the copper busbars 2 pass. The housing 1 also has a copper busbar sheath 5 that protects the copper busbars 2, covering the middle of the copper busbars 2. The copper busbars 2 have exposed external connection ends 6 and internal connection ends 7 on both sides. Vertical sidewall supports are provided on the sidewalls of the inductor cavity 4. The inductor cavity 4 has a bottom support rib 9 on its bottom surface. The annular inductor 3 is mounted on the side wall support rib 8 and the bottom support rib 9, thus forming a glue injection gap 10 between the inductor cavity wall and the annular inductor 3. The inductor cavity 4 is filled with epoxy resin, and the glue injection gap 10 is wetted by the epoxy resin. The annular inductor 3 is submerged in the epoxy resin. The outer connection end 6 of the copper busbar 2 is also provided with a sealing groove 11, which is located inside the opening at the end of the copper busbar casing 5. For ease of manufacturing, the casing on the copper busbar 2 is injection molded with a core. This manufacturing method creates a connection reinforcement structure at the sealing groove 11, increasing the bonding strength between the casing and the copper busbar 2 and preventing oil and gas intrusion.

[0028] In a preferred embodiment, the sealing groove 11 on the copper busbar 2 consists of three parallel grooves.

[0029] To further enhance sealing performance, the housing 1 has a cavity cover mounting edge 12 at the end of the inductor cavity 4, and a sealing cap 13 is glued to the cavity cover mounting edge 12. The copper busbar casing 5 extends through the sealing cap 13. This prevents the epoxy resin from being directly exposed to oily substances.

[0030] Furthermore, a first sealing sleeve 14 is fitted on the copper busbar shell 5 at the point where it passes through the sealing cover 13, and a second sealing sleeve 15 is also provided on the copper busbar shell 5 below the first sealing sleeve 14.

[0031] To prevent short circuits between adjacent copper busbars 2, the extension length of the middle copper busbar casing 5 on the outer connection end 6 side is longer than that of the left and right busbars.

[0032] To further enhance insulation performance, a side wall 16 is provided at the end of the copper busbar cladding 5 where it connects to the outer connection end 6. The side wall 16 covers part of the side surface of the outer connection end 6 of the copper busbar 2.

[0033] The toroidal inductor 3 is preferably selected from the nanocrystalline inductors, and we use iron-based nanocrystalline materials of 1K107B alloy.

[0034] The anti-break-circuit structure between the inner connection ends 7 is preferably optimized, and the housing 1 is provided with a partition plate 17 between the inner connection ends 7 of the copper busbar 2.

[0035] To increase the connection strength of the housing 1, a metal structural reinforcement 18 is embedded in the connecting lug on the side of the housing 1.

[0036] Furthermore, the upper part of the copper busbar 2 is provided with a U-shaped bend 19.

[0037] In this embodiment, the present invention is installed on the motor controller, the external connection terminal 6 is connected in series to the power supply of the drive motor, and the internal connection terminal 7 is connected to the motor controller to suppress electromagnetic interference.

[0038] When installed on the interface of the motor controller, the outer ends of the first sealing sleeve 14 and the second sealing sleeve 15 abut against the interface, sealing the assembly on the interface.

[0039] The specific operating principle is the same as that of existing filter inductors, and will not be repeated here.

[0040] The beneficial effects of this invention are as follows: 1. Oil and water corrosion can reduce the insulation performance of iron-based inductor windings, causing leakage and other problems, affecting the safety and stability of the circuit. The outer sealing cover, the first sealing sleeve, and the epoxy resin have good insulation properties. After wrapping the iron-based inductor, they can enhance its insulation ability, prevent oil from damaging the insulation performance, and ensure that the inductor maintains a reliable insulation state even in an oily environment. 2. The complete wrapping with epoxy resin effectively prevents oil from damaging the iron-based inductor, reducing various faults caused by oil, such as winding short circuits and core performance deterioration. This allows the iron-based inductor to work more stably in an oily environment, reducing the frequency of maintenance and replacement, thereby extending the inductor's service life and providing a guarantee for the long-term stable operation of the equipment. 3. The inductor using 1K107B alloy iron-based nanocrystalline material has good chemical stability and can resist oil corrosion. On the other hand, the iron-based nanocrystalline material has excellent broadband characteristics and can better suppress interference signals of different frequencies.

Claims

1. An oil-resistant filter inductor for suppressing electromagnetic interference in a power supply, comprising a housing and three copper busbars (UVW poles) located within the housing, wherein the housing has an inductor cavity for accommodating a ring-shaped inductor, and the copper busbars pass through the ring-shaped inductor; the housing also has a copper busbar sheath protecting the copper busbars, the sheath covering the middle of the copper busbars, and the copper busbars having exposed external and internal connection terminals on both sides, characterized in that: The inductor cavity has vertical sidewall support ribs on its sidewalls and bottom support ribs on its bottom surface. The annular inductor is mounted on the sidewall support ribs and bottom support ribs, thus forming a glue injection gap between the inductor cavity wall and the annular inductor. Epoxy resin is poured into the inductor cavity and the glue injection gap is wetted by epoxy resin. The annular inductor is submerged in the epoxy resin. A sealing groove is also provided on the outer connection end of the copper busbar, and the sealing groove is located within the opening position of the end of the copper busbar casing.

2. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: The sealing groove on the copper busbar consists of three parallel grooves.

3. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: The housing has a cavity cover mounting edge at the end of the inductor cavity, and a sealing cover is glued to the cavity cover mounting edge, through which the copper busbar cladding extends.

4. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 3, characterized in that: The copper busbar cladding is fitted with a first sealing sleeve at the point where it passes through the sealing cover, and a second sealing sleeve is also provided below the first sealing sleeve on the copper busbar cladding.

5. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: The extension length of the middle copper busbar cladding on one side of the outer connection end is longer than that of the left and right sides.

6. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: A side wall is provided at the end of the copper busbar cladding where it connects to the outer connection end, and the side wall covers part of the side of the outer connection end of the copper busbar.

7. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: The toroidal inductor is a nanocrystalline inductor.

8. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: The housing has a partition plate between the inner connecting ends of the copper busbars.

9. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: Metal structural reinforcements are embedded in the connecting lugs on the side of the housing.

10. The oil-resistant filter inductor for suppressing electromagnetic interference in a power supply according to claim 1, characterized in that: The upper part of the copper busbar has a U-shaped bend.

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