CN110739807A - device for filtering output line of motor - Google Patents
device for filtering output line of motor Download PDFInfo
- Publication number
- CN110739807A CN110739807A CN201910972252.3A CN201910972252A CN110739807A CN 110739807 A CN110739807 A CN 110739807A CN 201910972252 A CN201910972252 A CN 201910972252A CN 110739807 A CN110739807 A CN 110739807A
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- conductive rubber
- box body
- shielding box
- rubber strip
- filtering
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- 238000001914 filtration Methods 0.000 title claims abstract description 33
- 238000009434 installation Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0015—Gaskets or seals
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0049—Casings being metallic containers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention discloses device for filtering the output line of a motor, which comprises an electric connector (1), a shielding box body (2), a filter (3), a screw component (4), a conductive rubber strip (5), a cover plate (6) and connecting cables (7), and is characterized in that the two electric connectors are respectively connected with two ends of the shielding box body, the filter is arranged in the shielding box body through the screw component, the cover plate is connected on the shielding box body and is connected with the upper end of the shielding box body through a plurality of countersunk head screws, the conductive rubber strip is arranged between the cover plate and the upper end surface of the shielding box body, or more connecting cables are connected with the electric connector through plug-in type joints, the problem that the on-line conductive emission cannot be processed due to insufficient consideration of the electromagnetic compatibility of early products is solved, the environmental adaptability of the early products is improved, and the electromagnetic interference conducted through cables can be better reduced.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility of electronic equipment, in particular to devices for filtering an output line of a motor.
Background
In the actual operation process, equipment which generates a large amount of interference, such as a motor or a switching power supply, is often generated on system-level equipment, and the interference generated by the equipment can be shielded by manufacturing an outer cover of a Faraday-like cage so as to prevent the electromagnetic interference generated by the equipment from being radiated and conducted in space, and in the circuit, the electromagnetic interference generated by the equipment can still be conducted to other equipment in the circuit through a cable so as to generate interference to other equipment in the circuit, and possibly cause damage of devices and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides devices for filtering the output line of a motor, solves the problem that the on-line conduction emission cannot be processed due to the insufficient consideration of electromagnetic compatibility of early products, improves the environmental adaptability of the early products, and can better reduce the electromagnetic interference conducted through cables.
The invention mainly carries out electromagnetic compatibility processing on the output end of the motor or the input end of the control screen, the filtering component can be added outside the outlet end of the motor or inside the control screen, and carries out filtering processing on the current transmitted by the motor through a filter inside the component.
A filtering device for output connection cables of motors is mainly composed of three parts, wherein an external metal shell is integrally electroplated, and a Faraday cage is integrally formed after the surface of the metal shell is conducted and assembled, so that radiation conduction in a box body can be effectively shielded, and radiation conduction of an external electromagnetic field can also be shielded, so that interference of radiation conduction of the external electromagnetic field on cables filtered inside is avoided, and a large amount of disturbing signals still exist on the cables after filtering, an internal filter mainly plays a role in filtering output wires of the motors and reducing medium electromagnetic interference conducted in motor output, an electric connector is mainly used for connecting internal and external lines, so that the motor output wires are conducted out after being filtered by the device, and simultaneously, the external electromagnetic radiation interference can be reduced by adopting a connector type, and meanwhile, connecting cables with proper length are provided for connecting the device into an original circuit without influencing the wiring of the original circuit, input/output isolation is realized as much as possible during wiring, the mutual intersection, the parallel paths of the input/output wires of the filter are strictly prohibited, and the mutual coupling of the input/output wires is avoided, so that the filtering effect is reduced.
In order to achieve the purpose, the invention adopts the technical scheme that:
device for filtering the output line of the motor, which comprises an electric connector (1), a shielding box body (2), two filters (3), screw components (4), conductive rubber strips (5), a cover plate (6) and connecting cables (7), and is characterized in that the two electric connectors are respectively connected with the two ends of the shielding box body, the filters are arranged in the shielding box body through the screw components, the cover plate is connected with the shielding box body and is connected with the upper end of the shielding box body through a plurality of countersunk screws, the conductive rubber strips are arranged between the cover plate and the upper end face of the shielding box body, and or more connecting cables are connected with the electric connector through plug-in type joints.
, the shielding box body is a rectangular box body and comprises a bottom plate and a vertical plate, the shielding box body and the cover plate are made of metal materials and are electroplated, a plurality of mounting and connecting holes are formed in the bottom plate, and mounting grooves are formed in the outer surface of the vertical plate and are used for accommodating the plug-in type electric connectors.
, the upper end of the vertical plate is provided with a plurality of boss parts, the boss parts protrude towards the inside of the shielding box body, the boss parts are provided with clamping grooves (25) and countersunk screw holes, the cross sections of the clamping grooves are rectangular, the clamping grooves are used for receiving conductive rubber strips (5), and the cross sections of the conductive rubber strips are rectangular and matched with the clamping grooves.
, a plurality of horizontal wire connectors and/or a plurality of second vertical wire connectors are arranged on the electric connector, a plurality of horizontal filter connectors are arranged at two ends of the filter, and the height of the center line of each filter connector is lower than that of the center line of each wire connector.
, the conductive rubber strip comprises a conductive rubber strip (51) and a second conductive rubber strip (52), wherein an isosceles trapezoid groove is formed in the conductive rubber strip, and the second conductive rubber strip is received in the isosceles trapezoid groove.
, the second conductive rubber strip has a conductivity and hardness greater than that of the th conductive rubber strip.
, the device is used to access the original circuit without affecting the original circuit connection.
, the shielding box forms a closed Faraday cage, and the joint of the mounting surface is no longer a continuous linear gap due to the clamping groove for mounting the conductive rubber strip on the mounting surface of the shielding box, so that the joint can be reflected and absorbed at the clamping groove due to the discontinuous surface when external electromagnetic waves are transmitted, and the shielding effect is realized by connecting ground feet with the ground for discharging.
This kind of device to motor output line filtering makes the box body form inclosed Faraday cage, because there is the draw-in groove of installation conductive rubber on the installation face of shielding box body, makes the seam crossing of installation face no longer be continuous straight line gap, can be in draw-in groove department when external electromagnetic wave propagates because of discontinuous surface by reflection and absorption, and the rethread lower margin is connected with ground and is discharged, accomplishes the shielding effect, can reduce the electromagnetic interference through the cable conduction betterly.
Drawings
FIG. 1 is a top view and a side view of a device for filtering the output line of a motor according to the present invention; wherein (a) a top view, (b) a side view;
FIG. 2 is a front view of the structure of the device for filtering the output line of the motor according to the present invention;
FIG. 3 is a schematic view of the structure of the conductive rubber strip of the present invention;
FIG. 4 is a schematic view of a connecting cable according to the present invention;
FIG. 5 is a diagram of the test data of the CE102 middle frequency band of 0.01-10MHz before the filtering measure is not added to the output line of the motor in the prior art;
FIG. 6 is a diagram of the test data of the CE102 mid-band 0.01-10MHz after the filtering measure is added to the output line of the motor.
In the figure, an electric connector 1, a shielding box body 2, a filter 3, a screw component 4, a conductive rubber strip 5, a cover plate 6, a connecting cable 7, a lead connector 11, a bottom plate 21, a vertical plate 22, a mounting connecting hole 23, a boss part 24, a clamping groove 25, a mounting groove 26, a filter connector 31, an th conductive rubber strip 51, a second conductive rubber strip 52 and a sunk screw 61.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete description of the technical solutions of the embodiments of the present invention will be given below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are partial embodiments of of the present invention, rather than all embodiments.
The present invention is further described in detail below with reference to the attached figures.
As shown in fig. 1-4, kinds of devices for filtering the output line of the motor, which includes an electrical connector 1, a shielding box 2, a filter 3, a screw component 4, a conductive rubber strip 5, a cover plate 6, and a connecting cable 7, and is characterized in that the electrical connector 1 is two and is respectively connected to the two ends of the shielding box 2, the filter 3 is disposed in the shielding box 2 through the screw component 4, the shielding box 2 is connected with the cover plate 6, the cover plate 6 is connected to the upper end of the shielding box 2 through a plurality of countersunk head screws 61, the conductive rubber strip 5 is disposed between the cover plate 6 and the upper end face of the shielding box 2, and or a plurality of connecting cables 7 are connected to the electrical connector 1 through a plug-in type.
The shielding box body 2 is a rectangular box body and comprises a bottom plate 21 and a vertical plate 22, the shielding box body 2 and a cover plate 6 are made of metal materials and are subjected to electroplating treatment, a plurality of mounting connecting holes 23 are formed in the bottom plate 21, mounting grooves 26 are formed in the outer surface of the vertical plate 22, the mounting grooves 26 are used for receiving the plug-in type electric connector 1, a plurality of boss portions 24 are arranged at the upper end of the vertical plate 22, the boss portions 24 protrude towards the inside of the shielding box body 2, clamping grooves 25 and countersunk screw holes are formed in the boss portions 24, the cross sections of the clamping grooves 25 are rectangular, the clamping grooves 25 are used for receiving the conductive rubber strips 5, and in the embodiment, the cross sections of the conductive rubber strips 5.
The electric connector 1 is provided with a plurality of horizontally arranged lead connectors 11 and/or a plurality of vertically arranged lead connectors 11, a plurality of horizontally arranged filter connectors 31 are arranged at two ends of the filter 3, and the height of the central line of each filter connector 31 is lower than that of the central line of each lead connector 11, so that reasonable arrangement of cables is facilitated.
In preferred embodiment, the conductive rubber strip 5 includes a conductive rubber strip 51 and a second conductive rubber strip 52, the conductive rubber strip 51 is provided with an isosceles trapezoid groove, the second conductive rubber strip 52 is received in the isosceles trapezoid groove, the conductivity and hardness of the second conductive rubber strip 52 are greater than those of the conductive rubber strip 51, and the shielding effect is further improved.
kind of device to motor output line filtering, it mainly comprises the triplex, including wave filter 3, electric connector 1 and shielding box body 2, a serial communication port, wave filter 3 passes through screw assembly 4 to be installed in shielding box body 1, and electric connector 1 installs in 2 both ends of shielding box body, finishes the back at electric connector 1 and wave filter 3 wiring, installs apron 6 on the shielding box body through countersunk screw 61, and wherein the wiring will violently tie vertically between electric connector 1 and the wave filter 3, accomplishes the input-output and keeps apart, avoids the intercoupling, and conductive rubber strip 5 will install in the shielding box body in draw-in groove 25/department.
The invention is realized in such a way that a gap between a shielding box body and a cover plate is sealed by a conductive rubber strip, so that the box body forms a closed Faraday cage, because a clamping groove for installing conductive rubber is arranged on the installation surface of the shielding box body, the joint of the installation surface is not a continuous linear gap any more, the gap can be reflected and absorbed by a discontinuous surface at the clamping groove when external electromagnetic waves are transmitted, and then the gap is connected with the ground through a ground pin to discharge, so that the shielding effect is realized, the device is additionally arranged at the wire outlet of a motor or the wire inlet of a control screen and is connected through a connecting cable, and the electromagnetic interference output by the motor can be effectively reduced after passing through a filter. The principle of the device for reducing electromagnetic interference adopts the common method of electromagnetic compatibility processing for shielding, grounding and filtering, so that the electromagnetic interference conducted through the cable can be well reduced.
The device for filtering the output line of the motor is connected into the original circuit without influencing the wiring of the original circuit, and input/output isolation is realized as much as possible during wiring, at least the mutual crossing of the input/output lines of the filter, the parallel path and the like are strictly forbidden, and the reduction of the filtering effect caused by the mutual coupling of the input/output is avoided.
FIG. 5 shows the test data of 0.01-10MHz in the middle frequency band of CE102 before the filter is not added to the output line of the motor of a certain product, and it can be seen from the figure that the product exceeds the limit of 60dBuV and approaches 6.5dB at about 0.5Hz, and the same frequency band is significantly reduced after the filter is added to the output end of the motor. Fig. 6 shows that the test data of the CE102 middle frequency band 0.01-10MHz after the filtering measure is added to the motor output box of the product, the maximum reduction can be obtained by about 20dB through data comparison, the reduction can be more than 8dBuV at the other points exceeding the limit value, and after reasonable shielding and grounding processing, the better filtering effect is achieved.
This kind of device to motor output line filtering makes the box body form inclosed Faraday cage, because there is the draw-in groove of installation conductive rubber on the installation face of shielding box body, makes the seam crossing of installation face no longer be continuous straight line gap, can be in draw-in groove department when external electromagnetic wave propagates because of discontinuous surface by reflection and absorption, and the rethread lower margin is connected with ground and is discharged, accomplishes the shielding effect, can reduce the electromagnetic interference through the cable conduction betterly.
The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (8)
- The device for filtering the output line of the motor comprises an electric connector (1), a shielding box body (2), a filter (3), screw components (4), conductive rubber strips (5), a cover plate (6) and connecting cables (7), and is characterized in that the two electric connectors are respectively connected to two ends of the shielding box body, the filter is arranged in the shielding box body through the screw components, the cover plate is connected to the shielding box body and connected to the upper end of the shielding box body through a plurality of countersunk head screws, the conductive rubber strips are arranged between the cover plate and the upper end face of the shielding box body, and or more connecting cables are connected with the electric connector through plug-in type joints.
- 2. The device for filtering the output line of motor as claimed in claim 1, wherein the shielding case is a rectangular case including a bottom plate and a vertical plate, the shielding case and the cover plate are made of metal and are plated, the bottom plate has a plurality of mounting holes, the vertical plate has a mounting groove on its outer surface for receiving the plug-in connector.
- 3. The device for filtering the output line of the motor, as claimed in claim 2, wherein the riser has a plurality of boss parts at its upper end, the boss parts protrude toward the inside of the shielding case, the boss parts are provided with a slot (25) and a countersunk screw hole, the slot has a rectangular cross section, the slot is used for receiving the conductive rubber strip (5), and the conductive rubber strip has a rectangular cross section and is matched with the slot.
- 4. The apparatus for filtering the output line of motor according to claim 3, wherein the electric connector has a plurality of horizontal wire connectors and/or a plurality of vertical wire connectors, and the filter has a plurality of horizontal filter connectors at its two ends, and the height of the central line of the filter connector is lower than that of the central line of the wire connectors.
- 5. device for filtering output line of motor according to claim 4, wherein the conductive rubber strip includes conductive rubber strip (51) and second conductive rubber strip (52), the conductive rubber strip has isosceles trapezoid shaped groove, which receives the second conductive rubber strip.
- 6. The device for filtering the output line of motor as claimed in claim 5, wherein the second rubber strip has a conductivity and hardness greater than that of the th rubber strip.
- 7. The apparatus for filtering the output line of motor as claimed in claim 6, wherein the apparatus is used to access the original circuit without affecting the wiring of the original circuit.
- 8. The device for filtering the output line of motor as claimed in claim 6, wherein the shielding box forms a closed Faraday cage, and the slots for installing the conductive rubber strips are arranged on the installation surface of the shielding box, so that the joint of the installation surface is no longer a continuous linear gap, and when external electromagnetic waves propagate, they are reflected and absorbed by the discontinuous surface at the slots, and then they are connected to the ground via the ground legs to discharge, thus realizing the shielding effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910972252.3A CN110739807B (en) | 2019-10-14 | 2019-10-14 | Device for filtering output line of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910972252.3A CN110739807B (en) | 2019-10-14 | 2019-10-14 | Device for filtering output line of motor |
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| Publication Number | Publication Date |
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| CN110739807A true CN110739807A (en) | 2020-01-31 |
| CN110739807B CN110739807B (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910972252.3A Active CN110739807B (en) | 2019-10-14 | 2019-10-14 | Device for filtering output line of motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525532A (en) * | 2020-04-29 | 2020-08-11 | 厦门鼎芯科技有限公司 | Three-way electromagnetic shielding control box |
| CN114096137A (en) * | 2021-11-01 | 2022-02-25 | 浙江吉利控股集团有限公司 | Vehicle and electronic equipment thereof |
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| CN102983828A (en) * | 2012-11-26 | 2013-03-20 | 西安开容电子技术有限责任公司 | Filter of impulse power output port of motor speed controller |
| CN205378491U (en) * | 2016-02-29 | 2016-07-06 | 山东超越数控电子有限公司 | Multipurpose standard interface shielding case module |
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| JP2019103155A (en) * | 2017-11-28 | 2019-06-24 | 富士電機株式会社 | Inverter device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111525532A (en) * | 2020-04-29 | 2020-08-11 | 厦门鼎芯科技有限公司 | Three-way electromagnetic shielding control box |
| CN114096137A (en) * | 2021-11-01 | 2022-02-25 | 浙江吉利控股集团有限公司 | Vehicle and electronic equipment thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110739807B (en) | 2021-06-25 |
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