CN102637476B - Nonmagnetic material ring used for lowering ultrahigh frequency electromagnetic interference on cable - Google Patents
Nonmagnetic material ring used for lowering ultrahigh frequency electromagnetic interference on cable Download PDFInfo
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- CN102637476B CN102637476B CN201210144531.9A CN201210144531A CN102637476B CN 102637476 B CN102637476 B CN 102637476B CN 201210144531 A CN201210144531 A CN 201210144531A CN 102637476 B CN102637476 B CN 102637476B
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Abstract
The invention discloses a nonmagnetic material ring used for lowering ultrahigh frequency electromagnetic interference on a cable. The nonmagnetic material ring is made from nonmagnetic materials, is arranged on the cable by adopting a non-complete coated manner and is in a ring-shaped layer structure, wherein the nonmagnetic material ring is in a multi-layer structure; two kinds of coating layers can be arranged between adjacent layers and/or on the surface of the layers; and frequencies of the electromagnetic interference correspondingly reduced by the coating layers are different. According to the nonmagnetic material ring, compared with the prior art, the movement of the ultrahigh frequency electromagnetic interference can be basically cut off in the whole cable; the ultrahigh frequency electromagnetic interference on the cable is lowered; and the accuracy of transmission data of the cable is improved, so that the precision of the electronic equipment is improved.
Description
Technical field
The present invention relates to a kind of for reducing the nonmagnetic substance ring of hyperfrequency electromagnetic interference on cable.
Background technology
The develop rapidly of modern industrial technology makes electromagnetic interference phenomenon day by day serious, although strict technical standard has all been formulated in countries in the world to this, take various technological means replies, but still there is no good technical cue for the shield technology of the above electromagnetic interference of 100MHz (megahertz).
Current nearly all electronic equipment all adopts the work of computer (or microcomputer) control mode, these computers are all by LSI(large scale integrated circuit) institute form, these LSI are very responsive to hyperfrequency electromagnetic interference, are that current high precision technology electronic equipment does not reach the main cause of Theoretical Design requirement.Electronic equipment all must adopt cable to transmit data and power supply, and hyperfrequency electromagnetic interference can affect data-signal by cable, and generation time postpones or wave distortion, the object that can not reach accurate analysis or accurately control.
Mainboard in electronic equipment, power supply and data wire all work under very high frequency state, thus cause existing in cabinet a large amount of space stray electromagnetic interference signals, and signal strength signal intensity is also several times to tens times outside cabinet! If cable is not taked shielding measure in this space, these cables have just become good antenna so, receive various mixed and disorderly high-frequency signals in surrounding environment, and these signals are superimposed upon on the signal of original transmission, even can change the useful signal of original transmission, easily go wrong.
Conventional anti-electromagnetic interference technological means mainly contains two kinds at present:
1, anti-interference magnet ring: overlap a magnet ring on cable.
2, electrostatic screen layer: in order to improve transmission rate and stability, also for reduce transmission line when transmitting data to other equipment, as the interference of sound card, designed electrostatic screen layer.This screen is to be woven into netted making by a thinner tinsel or multiply thin copper wire, application be the skin effect principle of electrostatic field.Namely the outer surface of cable is wrapped to layer of metal film, and this screen and cabinet are carried out to ground connection, just can be well by cable and the isolation of space interference signal.
Above two kinds of methods can be more limited for the lower electromagnetic interference of frequency processing, but cannot effectively process the hyperfrequency electromagnetic interference such as decimeter wave, centimeter wave and microwave.
First method, due to the characteristic limitations of magnetic material, cannot be processed hyperfrequency.The second way is because single-layer metal film is poor for hyperfrequency electromagnetic interference isolating power.Therefore adopt the signal that the cable of above two kinds of processing modes transmits still to have distortion.
Summary of the invention
In order to overcome the defect of prior art, the invention discloses a kind of for reducing the nonmagnetic substance ring of hyperfrequency electromagnetic interference on cable, it can cut off the motion of hyperfrequency electromagnetic interference in whole piece cable substantially, reduce hyperfrequency electromagnetic interference on cable, improve the accuracy that cable transmits data, thereby improve the precision of electronic equipment.
Technical scheme of the present invention is as follows:
For reducing a nonmagnetic substance ring for hyperfrequency electromagnetic interference on cable, it is made by nonmagnetic substance, and adopts non-all coated modes to be arranged on cable; Described nonmagnetic substance ring is annular layer structure.
Preferably, described nonmagnetic substance ring is sandwich construction, in those sandwich constructions, on layer surface, dope layer can be set between layers and/or directly, at least two kinds of dope layers, and the frequency that those kind of dope layer correspondence adopting can reduce electromagnetic interference is different.
Preferably, described nonmagnetic substance ring comprises fibrous material layer, and the dope layer that corresponding fibrous material layer arranges adopts water soluble paint, and described dope layer penetrates into fibrage, and is combined with each other with it.
Preferably, every one deck is equipped with corresponding dope layer.
Preferably, described nonmagnetic substance ring comprises:
Stack gradually the upper layer insulating, intermediate layer and the lower layer insulating that at least arrange; Described intermediate layer is that metal film and dielectric film replace overlapping forming; Described upper layer insulating, metal film, dielectric film, each layer of surface of lower layer insulating are provided with corresponding dope layer.
Preferably, described upper layer insulating, lower layer insulating and dielectric film are fiber material.
Preferably, described nonmagnetic substance ring is arranged on the one or both ends of cable.
Preferably, described dope layer can be arranged at upper surface or lower surface or the upper and lower surface of every one deck.
Preferably, the thickness of described nonmagnetic substance ring is more than 0.5 millimeter, and width is more than 1 millimeter.
Preferably, metallic film surface is provided with the dope layer that viscosity is good.
Preferably, described nonmagnetic substance ring comprises:
The upper layer insulating being cascading, intermediate layer and lower layer insulating; Upper layer insulating is fiber paper, and intermediate layer is aluminium foil layer, and lower layer insulating is fiber paper;
Upper strata insulation and lower layer insulating layer surface are provided with and reach accordingly agate dope layer, and centre layer by layer surface is provided with corresponding 688 dope layers.
Preferably, described nonmagnetic substance ring comprises:
The upper layer insulating being cascading, intermediate layer and lower layer insulating; Upper layer insulating is fiber paper, and lower layer insulating is fiber paper; Intermediate layer is by aluminium foil, the fibrous paper of totally seven layers are arranged alternately stacking forming;
And upper strata insulation and lower layer insulating layer surface are provided with corresponding horse base of a fruit dope layer; The fibrous paper surface in intermediate layer is provided with and reaches accordingly agate dope layer; Aluminium foil surface is provided with corresponding 688 dope layers.
Preferably, described nonmagnetic substance ring comprises:
The upper layer insulating being cascading, intermediate layer and lower layer insulating; Upper layer insulating is fiber paper, and lower layer insulating is fiber paper, and intermediate layer is by aluminium foil, the fibrous paper of totally ten seven layers are arranged alternately stacking forming;
And upper strata insulation and lower floor's surface of insulating layer are provided with corresponding horse base of a fruit dope layer; The fibrous paper surface in intermediate layer is provided with and reaches accordingly agate dope layer; Aluminium foil surface is provided with corresponding 688 dope layers.
For reducing a nonmagnetic substance ring for hyperfrequency electromagnetic interference on cable, it is made by nonmagnetic substance, and adopts non-all coated modes to be arranged on cable.
Preferably, described nonmagnetic substance ring is annular layer structure, and every one deck is equipped with corresponding dope layer.
Compared with prior art, beneficial effect of the present invention is as follows:
The first, the present invention adopts the non-all coated modes of the annulation of nonmagnetic substance to be arranged on cable, effectively reduces hyperfrequency electromagnetic interference on cable, improves the accuracy that cable transmits data.
Second, the present invention adopt to the electromagnetic interference of different frequency have the multiple coating of different shield effectivenesses to be coated in respectively on fiber material and metal film on, make multiple paper film and the metal film with the shielding action of reply different frequency, according to specification requirement by these film multiple-layer stackeds, according to complementarity principle, form the multiple layer combination with wideband shield effectiveness, after last, be processed into thickness more than 0.5 millimeter, width is at more than 1 millimeter stripe object.These stripe objects are made to the annulus (or elliptical ring and flat type ring) of different-diameter according to cable size, this ring set on different cables.Because hyperfrequency electromagnetic interference is moved inside and outside cable according to wavelength own, added this ring and just can effectively cut off the moving line of hyperfrequency electromagnetic interference wave inside and outside cable afterwards, thereby significantly reduced interference volume.
Accompanying drawing explanation
Fig. 1 is that the specific embodiment of the invention is a kind of for reducing the structural representation of the nonmagnetic substance ring of hyperfrequency electromagnetic interference on cable.
Embodiment
For reducing a nonmagnetic substance ring for hyperfrequency electromagnetic interference on cable, it is made by nonmagnetic substance, and adopts non-all coated modes to be arranged on cable; Described nonmagnetic substance ring is annular layer structure.
All coated at the outer surface of cable non-" the electrostatic screen layer " as mentioning in background technology that above-mentioned " non-all coated " refers to.The present invention adopts annular mode to be only partly coated on cable.
Above-mentioned " nonmagnetic substance " refers to the magnetic material that non-" anti-interference magnet ring " as mentioning in background technology or other anti-electromagnetic interference products are in the market used.
Wherein, described nonmagnetic substance ring is sandwich construction, in those sandwich constructions, on layer surface, dope layer can be set between layers and/or directly, at least two kinds of dope layers, and the frequency that those kind of dope layer correspondence adopting can reduce electromagnetic interference is different.
The present invention both can adopt mode one: the mode that dope layer is set in every layer of surface; First in every layer of surface, be coated with dope layer, more every one deck is superposeed.
Also can adopt mode two: the mode of more convenient processes, coating is directly made to individual layer, add between the layers dope layer, processing directly superposes.
Or mode three: mode one and mode two mix processing.
Or in some cases,, for certain one deck or some layer, also dope layer can be set.
The present invention does not limit above-mentioned situation.
Following is structure for a kind of nonmagnetic substance ring of mode one, and described nonmagnetic substance ring comprises:
Stack gradually the upper layer insulating, intermediate layer and the lower layer insulating that at least arrange; Described intermediate layer is that metal film and dielectric film replace overlapping forming; Described upper layer insulating, metal film, dielectric film, each layer of surface of lower layer insulating are provided with corresponding dope layer.
Described upper layer insulating, lower layer insulating and dielectric film are fiber material.Claim those layers for " fibrous material layer " herein.
Here " fiber material " can be fibrous paper or fiber cloth.The present invention does not make restriction to the particular type of the concrete material of upper layer insulating, lower layer insulating and dielectric film and " fiber material ".
For fibrous material layer, the dope layer that corresponding fibrous material layer arranges adopts water soluble paint, and this dope layer penetrates into fibrage, and is combined with each other with it.
Different dope layers have different shield effectivenesses to the electromagnetic interference of different frequency.The coating of use on upper and lower insulating barrier, dielectric film is generally selected water soluble paint.Water soluble paint has advantages of good penetrability, and it more easily permeates on fibrous material layer.
And use the coating on metal film, generally select the coating that viscosity is good.The mobility of the coating that viscosity is good is poor, the adhesion of easier metal film and its upper and lower layer.
What each embodiment of below mainly adopted is following three kinds of coating, and the frequency that these three kinds of coating correspondences can reduce electromagnetic interference is different:
Reach agate coating, by Britain " Winsor & Newton " company, produced, full name is DAMMAR VARNISH.
Agate base of a fruit coating, is produced by Shanghai Industrial Maries Painting Materials Co., Ltd., numbering No.730.
688 coating, are produced by Italy " MAIMERI " company, and full name is PICTURE CRACKING VARNISH.
Here the basic concepts relating to is done to an explanation:
Electromagnetic interference (EMI) English: (Electro Magnetic Interference) is the electronic noise that disturbs cable signal and reduce signal integrity.
Electromagnetic interference EMI (Electromagnetic Interference), has two kinds of conducted interference and radiated interference.Conducted interference refers to by conducting medium the signal coupling (interference) on an electric network is arrived to another electric network.Radiated interference refers to that interference source arrives another electric network by space its signal coupling (interference).In electronic equipment, the pin of high-frequency signal line, integrated circuit, all kinds of connectors etc. all may become the radiated interference source with antenna performance, and energy emitting electromagnetic wave also affects other system or the normal work of interior other subsystems of native system.
Below with the drawings and specific embodiments, the present invention will be further described:
embodiment mono-
As Fig. 1, a kind of for reducing the nonmagnetic substance ring 100 of hyperfrequency electromagnetic interference on cable, it is arranged at one end of the cable 200 of sound appliances.
Because the actual operating frequency scope of sound equipment is below 20KHz, so we adopt 3-tier architecture mode, i.e. " fibrous paper+aluminium foil+fibrous paper " scheme." Da Ma " coating for fibrous paper, aluminium foil 688 coating.
In the present embodiment, described nonmagnetic substance ring is annular layer structure, comprises the upper layer insulating, intermediate layer and the lower layer insulating that are cascading; Upper layer insulating is fiber paper, and intermediate layer is aluminium foil layer, and lower layer insulating is fiber paper.
The upper surface of upper layer insulating and lower layer insulating or lower surface or upper and lower surface all scribble and reach agate coating, and the upper surface in intermediate layer or lower surface or upper and lower surface scribble 688 coating.
Reach the permeate well of agate coating, after it is solid, directly upper layer insulating, the lower layer insulating corresponding with it is combined with each other.
In the present embodiment, described nonmagnetic substance ring is arranged on one end of cable.During concrete enforcement, it also can be arranged on the two ends of cable.So long as be arranged on cable in non-all coated modes, the present invention does not make restriction to it.Here said " one end " or " two ends ", all refer to the position near two ends of cable.
In the present embodiment, intermediate layer is aluminium foil layer, and while specifically implementing, it can be also the metal level of other types, and the present invention does not make restriction to it.
In the present embodiment, the thickness of described nonmagnetic substance ring is more than 0.5 millimeter, and width is more than 1 millimeter.
The principle that the present invention can effectively reduce hyperfrequency electromagnetic interference on cable is as follows:
The signal that cable transmits be all " active ", by pre-amplifier, drive and be sent to the low internal resistance signal of next stage, be mainly to utilize voltage difference to transmit by cable conductor inside, exterior shield cannot be destroyed delivering path.And the present invention for interference signal be outside ultra-high-frequency passive radiation signal, energy is little, internal resistance is high, is to carry out non-directional transmission along with oneself different wave length.The electromagnetic wave that nonmagnetic substance ring of the present invention is greater than the diameter of ring for wavelength has shielding (blocking-up) effect, can cut off the delivering path of these hyperfrequency electromagnetic interference waves, for interference signal, equal to be provided with one section of very valve of slim pipe diameter in running water pipe, reach the object that significantly reduces interference volume.
embodiment bis-
For reducing a nonmagnetic substance ring for hyperfrequency electromagnetic interference on cable, it is arranged at the one or both ends of colour TV cable.
Colour TV operating frequency is higher, and we adopt 9 layers of organization plan, i.e. " fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper " scheme.Horse base of a fruit coating for innermost layer and outermost fibers paper, other layer of fibrous paper be with reaching agate coating, aluminium foil 688 coating.
In the present embodiment, described nonmagnetic substance ring is annular layer structure, comprises the upper layer insulating, intermediate layer and the lower layer insulating that are cascading; Upper layer insulating is fiber paper, and lower layer insulating is fiber paper.Intermediate layer is by aluminium foil, the fibrous paper of totally seven layers are arranged alternately stacking forming.
And the upper surface of upper strata insulation and lower layer insulating or lower surface or upper and lower surface all scribble horse base of a fruit coating.The fibrous paper upper surface in intermediate layer or lower surface or upper and lower surface all scribble and reach agate coating.The upper surface of aluminium foil or lower surface or upper and lower surface scribble 688 coating.
Horse base of a fruit coating, reach the permeate well of agate coating, after it is solid, can be directly corresponding with it layer be combined with each other.Horse base of a fruit coating, the frequency of hyperfrequency that reaches agate coating, the electromagnetic interference reducing that 688 coating are corresponding are different.
In the present embodiment, the thickness of described nonmagnetic substance ring is more than 0.5 millimeter, and width is more than 1 millimeter.
embodiment tri-
For reducing a nonmagnetic substance ring for hyperfrequency electromagnetic interference on cable, it is arranged at the one or both ends of automobile and Medical Instruments cable.
Automobile and Medical Instruments operating frequency are high, and disturb to external world responsive, we adopt 19 layered schemes, i.e. " fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper+aluminium foil+fibrous paper " scheme.Innermost layer and " Ma Di " coating for outermost fibers paper, other layer of " Da Ma " coating for fibrous paper, aluminium foil 688 coating.
In the present embodiment, described nonmagnetic substance ring is annular layer structure, comprises the upper layer insulating, intermediate layer and the lower layer insulating that are cascading; Upper layer insulating is fiber paper, and lower layer insulating is fiber paper.Intermediate layer is by aluminium foil, the fibrous paper of totally ten seven layers are arranged alternately stacking forming.
And the upper surface of upper strata insulation and lower layer insulating or lower surface or upper and lower surface all scribble " Ma Di " coating.The fibrous paper upper surface in intermediate layer or lower surface or upper and lower surface all scribble " Da Ma " coating.The upper surface of aluminium foil or lower surface or upper and lower surface scribble 688 coating.
In the present embodiment, the thickness of described nonmagnetic substance ring is more than 0.5 millimeter, and width is more than 1 millimeter.
Except three above-mentioned embodiment, nonmagnetic substance ring of the present invention can also should for example, in more field:
1, automobile: modern gasoline formula automobile engine all adopts high-tension ignition, electronic oil injection is controlled, and transducer is set in cylinder operating state is sent to the car running computer (ECU) of automobile, form loop feedback and control the duration of ignition and injection time and the distributive value of automobile, this three needs to finish the work by cable.Cable is subject to will causing igniting and injection time skew after hyperfrequency electromagnetic interference influence, and transducer is carried the distortion of signal, makes automobile engine can not be operated in optimum state.One end at high-voltage line (one, every cylinder), oil atomizer control line (one group, every cylinder) and the sensor transmissions line of any automobile adds a ring of the present invention, and automobile power can improve greatly, and discharge reduces, and engine operation is smooth-going, and noise reduces.
2, notebook computer: respectively add a ring of the present invention at the input of AC power cord and the DC output end of stabilized voltage power supply, just can improve the picture quality of notebook computer and shorten starting up's time.
3, HDMI line: HDMI (High Definition Multimedia Interface) (English: High Definition Multimedia Interface, HDMI) be a kind of digitized video/audio interface technology, it is the tailored version digital interface that is applicable to image transmission, it can transmit audio frequency and video-audio signal simultaneously, HDMI line is exactly cable, as long as respectively add a ring of the present invention at HDMI line two ends, just can make to transmit data accurate, greatly improve image and sound quality.
Compared with prior art, beneficial effect of the present invention is as follows:
The first, the present invention adopts the non-all coated modes of the annulation of nonmagnetic substance to be arranged on cable, effectively reduces hyperfrequency electromagnetic interference on cable, improves the accuracy that cable transmits data.
Second, the present invention adopt to the electromagnetic interference of different frequency have the multiple coating of different shield effectivenesses to be coated in respectively on fiber material and metal film on, make multiple paper film and the metal film with the shielding action of reply different frequency, according to specification requirement by these film multiple-layer stackeds, according to complementarity principle, form the multiple layer combination with wideband shield effectiveness, after last, be processed into thickness more than 0.5 millimeter, width is at more than 1 millimeter stripe object.These stripe objects are made to the annulus (or elliptical ring and flat type ring) of different-diameter according to cable size, this ring set on different cables.Because hyperfrequency electromagnetic interference is moved inside and outside cable according to wavelength own, added this ring and just can effectively cut off the moving line of hyperfrequency electromagnetic interference wave inside and outside cable afterwards, thereby significantly reduced interference volume.
The preferred embodiment of the present invention is just for helping to set forth the present invention.Preferred embodiment does not have all details of detailed descriptionthe, and also not limiting this invention is only described embodiment.Obviously, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present invention and practical application, thereby under making, technical field technical staff can utilize the present invention well.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (12)
1. for reducing a nonmagnetic substance ring for hyperfrequency electromagnetic interference on cable, it is characterized in that, described nonmagnetic substance ring is made by nonmagnetic substance, and it adopts non-all coated modes to be arranged on cable; Described nonmagnetic substance ring is annular layer structure; Described nonmagnetic substance ring is sandwich construction, in those sandwich constructions, on layer surface, dope layer is set between layers and/or directly, at least two kinds of dope layers, and the frequency that those kind of dope layer correspondence adopting can reduce electromagnetic interference is different.
2. nonmagnetic substance ring as claimed in claim 1, is characterized in that, described nonmagnetic substance ring comprises fibrous material layer, and the dope layer that corresponding fibrous material layer arranges adopts water soluble paint, and described dope layer penetrates into fibrage, and is combined with each other with it.
3. nonmagnetic substance ring as claimed in claim 1, is characterized in that, every one deck is equipped with corresponding dope layer.
4. described nonmagnetic substance ring as claimed in claim 1, is characterized in that, described nonmagnetic substance ring comprises:
Stack gradually the upper layer insulating, intermediate layer and the lower layer insulating that at least arrange; Described intermediate layer is that metal film and dielectric film replace overlapping forming; Described upper layer insulating, metal film, dielectric film, each layer of surface of lower layer insulating are provided with corresponding dope layer.
5. nonmagnetic substance ring according to claim 4, is characterized in that, described upper layer insulating, lower layer insulating and dielectric film are fiber material.
6. nonmagnetic substance ring according to claim 1, is characterized in that, described nonmagnetic substance ring is arranged on the one or both ends of cable.
7. nonmagnetic substance ring according to claim 1, is characterized in that, described dope layer is arranged at upper surface or lower surface or the upper and lower surface of every one deck.
8. nonmagnetic substance ring according to claim 1, is characterized in that, the thickness of described nonmagnetic substance ring is more than 0.5 millimeter, and width is more than 1 millimeter.
9. nonmagnetic substance ring according to claim 4, is characterized in that, metallic film surface is provided with the dope layer that viscosity is good.
10. nonmagnetic substance ring according to claim 4, is characterized in that, comprising:
The upper layer insulating being cascading, intermediate layer and lower layer insulating; Upper layer insulating is fiber paper, and intermediate layer is aluminium foil layer, and lower layer insulating is fiber paper;
Upper strata insulation and lower layer insulating layer surface are provided with and reach accordingly agate dope layer, and centre layer by layer surface is provided with corresponding 688 dope layers.
11. nonmagnetic substance rings according to claim 4, is characterized in that, comprising:
The upper layer insulating being cascading, intermediate layer and lower layer insulating; Upper layer insulating is fiber paper, and lower layer insulating is fiber paper; Intermediate layer is by aluminium foil, the fibrous paper of totally seven layers are arranged alternately stacking forming;
And upper strata insulation and lower layer insulating layer surface are provided with corresponding horse base of a fruit dope layer; The fibrous paper surface in intermediate layer is provided with and reaches accordingly agate dope layer; Aluminium foil surface is provided with corresponding 688 dope layers.
12. nonmagnetic substance rings according to claim 4, is characterized in that, comprising:
The upper layer insulating being cascading, intermediate layer and lower layer insulating; Upper layer insulating is fiber paper, and lower layer insulating is fiber paper, and intermediate layer is by aluminium foil, the fibrous paper of totally ten seven layers are arranged alternately stacking forming;
And upper strata insulation and lower floor's surface of insulating layer are provided with corresponding horse base of a fruit dope layer; The fibrous paper surface in intermediate layer is provided with and reaches accordingly agate dope layer; Aluminium foil surface is provided with corresponding 688 dope layers.
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| CN107613187B (en) * | 2017-11-10 | 2020-12-08 | 四川沃加科技有限公司 | Anti-interference security monitoring device |
| CN108777932A (en) * | 2018-06-11 | 2018-11-09 | 北京长城华冠汽车科技股份有限公司 | A kind of the high-tension shielding box and high tension distribution system of electric vehicle |
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| JP2001025193A (en) * | 1999-07-09 | 2001-01-26 | Nippon Densan Corp | Permanent magnet type rotor and cover for preventing scattering of permanent magnet |
| JP4671997B2 (en) * | 2007-10-23 | 2011-04-20 | 三菱電機株式会社 | Rotor for rotating electrical machine and method for manufacturing the same |
| CN101740895A (en) * | 2008-11-20 | 2010-06-16 | 杨春雷 | Anti-jamming network cable |
| CN202632824U (en) * | 2012-05-11 | 2012-12-26 | 上海捷乾节能技术有限公司 | Nonmagnetic material ring used for lowering ultrahigh frequency electromagnetic interference on cable |
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Effective date of registration: 20160701 Address after: 201114, Shanghai, Minhang District, No. 1505 South Road 1, 2, A, B room Patentee after: SHANGHAI PUJIAN TECHNOLOGY Co.,Ltd. Address before: 200030, room 1, building 909, No. 138, Key Bridge Road, Shanghai, Xuhui District Patentee before: SHANGHAI JIEQIAN ENERGY-SAVING TECHNOLOGY Co.,Ltd. |
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