JP3924693B2 - Disturbance wave breaker transformer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a disturbance wave cutoff transformer such as a shield transformer or a noise cut transformer that cuts off a high-frequency disturbance wave (hereinafter sometimes referred to as noise) transmitted through a power line or a signal line. The present invention relates to an obstruction wave blocking transformer molded with an insulating resin. Here, the shield transformer is a transformer in which a primary coil and a secondary coil are separated by an insulator and an electrostatic shielding plate is disposed between the coils or between the coils and the outer periphery of the transformer. The noise cut transformer is configured such that the primary coil and the secondary coil are separated from each other by an insulator, and an electromagnetic shielding plate is disposed between the coils and the outer periphery of the transformer. It is a transformer with a structure that is arranged so that the magnetic flux of the obstruction wave does not cross each other.
[0002]
[Prior art]
  In recent years, computer control facilities and systems have increased, and information networks have expanded from an internal scale to an external scale and further to a global scale, and the number and types of information devices connected to the information network have increased remarkably. For example, in an intelligent building or the like, a large number of information devices are fed from a common distribution line for commercial power. For this reason, if external noise such as lightning surge, transmission line switching surge, or noise generated by other customers enters from the distribution line of commercial power, many information devices will be seriously damaged. As a result, it will lead to disaster. Therefore, make sure that external noise does not enter the building from the distribution line of commercial power. Specifically, the transformer of the power receiving / transforming equipment of the building, the key point of the indoor distribution line, and the power transformer of the important equipment The movement to use noise cut transformers has become widespread.
[0003]
  In addition, at the time of disasters such as the Great Hanshin-Awaji Earthquake, the transformers in the substation facilities of the building became the source of ignition, and it became a factor in the expansion of similar wares. This was because the transformer used a large amount of mineral oil as an insulating agent for insulation and cooling. Therefore, in order to avoid such a situation, it has become desirable to replace a coil with a transformer that uses a solid flame-retardant insulator instead of mineral oil. However, such transformers do not have the outer casing of oil and oil storage iron that conventional transformers using mineral oil as an insulating agent, so how to improve moisture resistance and thermal and mechanical strength. Is a problem. Therefore, as a solution, the coil is made of a mixture of a flame-retardant strong insulating resin, for example, a synthetic insulating resin such as epoxy, and a solid, non-flammable insulating material such as quartz powder that has good insulating properties and heat conduction. There is a strong demand from the related industries and the like to adopt molded transformers that are molded or added to a strong cloth woven with glass fibers or glass fibers, etc., and then molded together and further reinforced, insulated, and molded. It has become like this.
[0004]
  Therefore, for shield transformers and noise cut transformers, coils can be molded with a mixture of a flame-retardant strong insulating resin such as epoxy and a solid non-flammable insulator such as quartz powder. It has been demanded to add a tough cloth such as glass fiber to mold the coil integrally, or to integrally mold the shield transformer and the noise cut transformer together. However, neither a shield transformer or a noise cut transformer molded in this way has been developed yet for structural reasons.
[0005]
  For example, as shown in FIG. 15, the coil constituting the conventional noise cut transformer includes an annular primary coil 1 formed by winding multiple insulation-coated copper wires 5 in multiple layers, and an insulation coil wound on the entire surface thereof. The glass tape 9 is composed of an aluminum foil 8 as a shield wound around the entire surface of the insulating glass tape 9 without any gap, and an insulating glass tape 10 wound around the entire surface of the aluminum foil 8. The aluminum foil 8 is a metal foil having no gaps or pores. After the winding of the insulating glass tape 9, the insulation work including preliminary drying, varnish impregnation, varnish cutting, and drying and solidification is performed. If this varnish pickling work is performed twice, it takes about 30 hours. Further, after the winding of the insulating glass tape 10 is completed, the varnish-immersed and solidified operation is performed once over about 14 hours. The secondary coil has the same structure as the primary coil, and is manufactured by the same method.
[0006]
  The shield transformer has a larger area than the coil and noise shielding shields are provided between the coils and at the outer periphery, and the noise cut transformer is ideal to completely cover the coil with a shield without any gaps. The noise shielding shield is a metal foil or metal plate such as copper or aluminum having the best conductivity, and a metal foil or metal plate having no gaps or pores is used. For this reason, when a transformer having such a structure is molded with an insulating resin, the molded insulating resin is naturally peeled off on both surfaces of the metal plate of the noise shielding shield embedded therein, so that the required mechanical strength is obtained. Not only can it not be maintained, but also defects such as partial discharge occur. Also, if a transformer with a structure covered with a noise shielding shield without gaps is molded with insulating resin, the insulating resin cannot penetrate inside the noise shielding shield and the insulating resin does not reach the coil at all. It is not possible. Therefore, as for the shield transformer and the noise cut transformer, no mold transformer has been developed that has high moisture resistance, thermal and mechanical strength, and can withstand a large earthquake. The conventional shield transformer, abbreviated below, clearly demonstrates this.
[0007]
  In the conventional first shield transformer disclosed in Japanese Patent Laid-Open No. 10-289828, a low voltage winding and a high voltage winding wound around a bobbin are insulated and resin-molded, and a shield case is attached to the surface of the mold exterior part. This is a coaxial eccentric structure transformer.
[0008]
  A conventional surface mount type second shield transformer disclosed in Japanese Patent Application Laid-Open No. 11-204352 for a small electronic device is formed by molding a primary coil and a secondary coil wound around a square-shaped magnetic core with a sealing insulating resin. After that, a transformer with an off-centered eccentric structure constructed by electromagnetically shielding the surface of the sealing insulating resin with metal plating.
[0009]
  In the conventional third shield transformer disclosed in Japanese Patent Laid-Open No. 6-45162, the coil is insulated with an insulator, and then the inner and outer peripheral surfaces are electrostatically shielded with a conductive material. Molded with synthetic insulating resin mixed with magnetic material powder with good high frequency characteristics, and these coils are mounted separately on the core, and high frequency magnetic shields are interposed between each coil. This is a coaxial eccentric structure transformer.
[0010]
  Japanese Patent Laid-Open No. 6-318523 discloses a conventional fourth shield transformer in which a low-voltage side winding is disposed inside and a high-voltage side winding formed of a disk winding is disposed outside, and at least the high-voltage side winding In the mold transformer formed by molding with an insulating resin, a cylindrical conductor that covers the substantially upper half of the disk winding in the axial direction is formed on the outer periphery of the disk winding that constitutes the high-voltage side winding. The first shield is embedded in the insulating resin, and the second shield that is conical and extends substantially in the axial direction of the disk winding is embedded in the insulating resin on the inner peripheral surface of the disk winding. It is a coaxial concentric transformer formed by connecting the first and second shields to both ends of the high-voltage side winding.
[0011]
  Since the conventional first to third shield transformers are not transformers having a structure in which a shield is embedded in an insulating resin and molded integrally, none of them is a perfect mold transformer. In the conventional fourth shield transformer, a cylindrical first shield is disposed on the outer peripheral portion of the high-voltage side winding, and a conical second shield is disposed on the inner peripheral portion thereof to insulate them. It is molded with resin, and both the cylindrical first shield and the conical second shield are embedded in the insulating resin. However, since the insulating resin is not connected between the inner peripheral surface and the outer peripheral surface of the shield, the insulating resin peels off from the surface of the shield, resulting in a coil that is extremely weak against external force. Therefore, none of the four conventional shield transformers can have sufficient strength to withstand a disaster such as a large earthquake, both thermally and mechanically.
[0012]
  No noise cut transformer has been developed which is molded with an insulating resin. That is, the noise cut transformer disclosed in Japanese Patent No. 2645256 previously acquired by the inventor of the present application is a hole having a thickness of 0.5 to 100 μm on the entire peripheral surfaces of the primary coil and the secondary coil. This is a short-circuited ring-type obstruction wave blocking transformer characterized by the provision of a shield consisting of a short-circuited conductive thin layer with no gaps, but one with an insulating resin mold has been developed. Absent.
[0013]
  Moreover, the inventor of the present application published in an academic paper published by the Institute of Electrical and Electronics Engineers (IEEE TRANSACTION ON ELECTROMAGNETIC COMPATIBILITY Vol.41, No.3, August 1999) In the vicinity of each secondary coil, specifically, a short-circuit ring of a conductive thin film having a thickness of about 7 μm or less is disposed between these two coils, High noise attenuation rate is maintained in high frequency band exceeding several MHz, especially in high frequency band exceeding 10 MHz, and the amplitude of irregular sawtooth wave with various peaks and valleys of noise attenuation rate characteristic curve is sufficient. It has the feature of being suppressed. The short-circuit ring of the conductive thin film is a substantially ring-shaped aluminum foil having no holes or gaps as shown in FIG. As for this noise cut transformer type obstruction wave blocking transformer, an insulating resin mold has not been developed.
[0014]
[Problems to be solved by the invention]
  The problem to be solved by the present invention is:In noise cut transformer type obstruction wave cutoff transformerInsulating resin molding is performed without giving sufficient thermal strength and mechanical strength and without reducing the necessary performance of the shield and the short-circuit ring to the extent that they impede practical use.
[0015]
Delete
[0016]
  Delete
[0017]
[Means for solving the problem]
Claims for solving the above problems1Noise-cut transformer type obstruction wave cutoff transformerAnnular formed by winding multiple layers of insulated coated copper wireA primary coil, a secondary coil, and a core that forms a magnetic path between the primary coil and the secondary coil, and at least on the peripheral surface of the primary coilA shield composed of a short-circuited ring formed of an extra fine mesh conductive member,The thickness of the conductive part is approximately equal to or less than the skin depth due to the skin effect of the induced current in the high frequency region of the disturbance wave for which resonance is to be suppressed.ShieldFurthermore, the primary coil and the secondary coil were molded with an insulating resin together with the shield.
[0018]
  Claims for solving the above problems2Noise-cut transformer type obstruction wave cutoff transformerAnnular formed by winding multiple layers of insulated coated copper wireA primary coil;Annular formed by winding multiple layers of insulated coated copper wireA secondary coil is disposed in proximity to one or both of the primary coil and the secondary coil.Shielding element of short-circuited ring formed of extra fine mesh conductive memberAnd a core that forms a magnetic path between the primary coil and the secondary coil, andThe shield has thatThe thickness of the conductive part is approximately equal to or less than the skin depth due to the skin effect of the induced current in the high frequency region of the disturbance wave for which resonance is to be suppressed.Adopt a shieldFurther, the primary coil and the secondary coil areShieldAnd molded with insulating resin.
[0019]
  In this specification, the ultrafine mesh conductive member, Mesh tape with thin metal wire knitted, conductive fiber woven with good conductive material such as nylon and silver, conductive fiber coated with good conductive material such as copper / nickel, nonwoven fabric with copper or nickel Conductive fiber covered with a good conductive material such as copper, copper alloy, expanded metal such as aluminum, or mesh tape made of thin metal wireThat is.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  FIG. 1 is a cross-sectional view of a molded coil according to a first embodiment used in a shielded transformer obstruction wave blocking transformer having a coaxial concentric structure. The molded coil shown in FIG. 1 includes an insulating resin 6 and a primary coil 1, a secondary coil 2, and a shield 7 formed of an extra fine mesh member disposed between the primary coil 1 and the secondary coil 2. And is integrally molded. The primary coil 1 is a ring-shaped coil formed by winding an insulation-coated copper wire 5. The secondary coil 2 arranged coaxially and concentrically with the primary coil 1 is a ring-shaped coil having a smaller diameter than the primary coil 1 and similarly configured by winding an insulation-coated copper wire 5. The insulating coated copper wire 5 is a general one in which an insulating coating such as enamel is applied to the surface of the copper wire.
[0021]
  FIG. 2 is a cross-sectional view of a molded coil according to a second embodiment used in a shielded transformer obstruction wave blocking transformer having a coaxial concentric structure. The molded coil shown in FIG. 2 is configured by further applying a second shield to the molded coil of the first embodiment. The primary coil 1, the secondary coil 2, the primary coil 1, and the secondary coil are shown in FIG. The shielding body 7a formed of an extra fine mesh member disposed between the two and the shielding body 7b formed of an extra fine mesh member disposed on the outer periphery of the primary coil are integrally molded with an insulating resin 6. It is configured.
[0022]
  The shields 7, 7a and 7b employed in the shield transformer type obstruction wave blocking transformer shown in FIGS. 1 and 2 are made of mesh tape made of a thin metal wire and woven with a good conductive material such as nylon and silver. Combined conductive fiber, conductive fiber with woven fabric coated with good conductive material such as copper or nickel, conductive fiber with nonwoven fabric coated with good conductive material such as copper or nickel, mesh tape with thin metal wire knitted in bag Alternatively, it is formed of an extra fine mesh member such as an expanded metal such as copper, copper alloy, or aluminum having a shape as shown in FIG.
[0023]
  FIG. 3 is a cross-sectional view of the mold coil according to the first embodiment used in a noise-cut transformer type obstruction wave cutoff transformer having a coaxial eccentric structure. The molded coil shown in FIG. 3 is a short-circuited ring / shield formed of a multi-layer multi-turn primary coil 1, a multi-layer multi-turn secondary coil 2, and an extra fine mesh member disposed between them. 4 is integrally molded with an insulating resin 6.
In short, a shield made of a substantially ring-shaped short-circuited ring as shown in FIG. 12 formed of a very fine mesh-like conductive member is disposed in proximity to one or both of the primary coil and the secondary coil. Therefore, the molded coil shown in FIG. 3 constitutes a primary coil and a secondary coil that are employed in the noise-cut transformer type obstruction wave cutoff transformer described in claim 2.
In this specification, the primary coil of the multi-layer multi-turn is an annular primary coil formed by multi-winding the insulation-coated copper wire in multi-layers, and the secondary coil of the multi-layer multi-turn is insulated. An annular secondary coil formed by winding a copper wire in multiple layers.
[0024]
  FIG. 4 is a cross-sectional view of a mold coil according to a second embodiment used for a noise-cut transformer type obstruction wave cutoff transformer having a coaxial eccentric structure. The molded coil shown in FIG. 4 is formed of a multi-layered primary coil 1 in which a short-circuiting ring 4a formed of an extra fine mesh member is disposed in the vicinity thereof, and an extra fine mesh member of the lower side thereof. The multi-turn multi-turn secondary coil 2 in which the short-circuiting ring 4b is disposed in close proximity is molded integrally with an insulating resin 6.
In short, a shield made of a substantially ring-shaped short-circuited ring as shown in FIG. 12 formed of a very fine mesh-like conductive member is disposed in proximity to one or both of the primary coil and the secondary coil. Therefore, the molded coil shown in FIG. 4 constitutes a primary coil and a secondary coil that are employed in the noise cut transformer type obstruction wave cutoff transformer described in claim 2.
[0025]
  FIG. 5 is a cross-sectional view of a molded coil according to a third embodiment used for a noise-cut transformer type obstruction wave cutoff transformer having a coaxial eccentric structure. That is, the molded coil shown in FIG. 5 has a cylindrical short circuit ring 4c formed of an extra fine mesh member on its outer peripheral surface and a cylindrical short circuit ring 4d formed of an extra fine mesh member on its inner peripheral surface. The arranged multi-turn primary coil 1, a cylindrical short circuit ring 4e formed of an extra fine mesh member on its outer peripheral surface, and a cylindrical short circuit ring 4f formed of an extra fine mesh member on its inner peripheral surface are provided. It is configured by molding integrally with the secondary coil 2 having a multi-layered multi-turns disposed in close proximity to each other. The cylindrical short-circuit rings 4c to 4f are all conductive thin-layer short-circuit rings having a thickness of 0.1 to 100 μm.
In short, at least on the peripheral surface of the primary coil 1, a shield made of an ultrafine mesh conductive member is disposed. Therefore, the molded coil shown in FIG. 5 constitutes a primary coil and a secondary coil that are employed in the noise cut transformer type obstruction wave blocking transformer described in claim 1.
[0026]
  FIG. 6 is a cross-sectional view of a molded coil according to a fourth embodiment used in a noise-cut transformer type obstruction wave blocking transformer having a coaxial eccentric structure. That is, the molded coil shown in FIG. 6 includes a multi-turn primary coil 1 in which a shield 4g made of a short-circuited ring formed of an extra-fine mesh member is disposed on the entire circumferential surface, and a short-circuit formed of an extra-fine mesh member. It is configured by integrally molding a multilayer multi-turn secondary coil 2 in which a shield 4h made of a ring is arranged on the entire circumferential surface. Each of the shields 4g and 4h is a shield made of a short-circuited ring of a conductive thin layer having a thickness of 0.1 to 100 μm.
In short, at least on the peripheral surface of the primary coil 1, a shield made of an ultrafine mesh conductive member is disposed. Therefore, the molded coil shown in FIG. 6 constitutes a primary coil and a secondary coil that are employed in the noise cut transformer type obstruction wave cutoff transformer described in claim 1.
[0027]
  FIG. 7 is a cross-sectional view of a molded coil according to a fifth embodiment used for a noise-cut transformer type obstruction wave blocking transformer having a coaxial eccentric structure. That is, the molded coil shown in FIG. 7 is molded with the insulating resin 6 on the lower side of the primary coil 1 having a multi-layered multi-turn structure in which a shield 4 for a short-circuiting ring formed of an extra fine mesh member is disposed in close proximity. In addition, the secondary coil 2 having a multi-layer multi-turn count is also formed by molding with an insulating resin 6.
In short, a shield made of a substantially ring-shaped short-circuited ring as shown in FIG. 12 formed of a very fine mesh-like conductive member is disposed in proximity to one or both of the primary coil and the secondary coil. Therefore, the molded coil shown in FIG. 7 constitutes a primary coil and a secondary coil that are employed in the noise-cut transformer type obstruction wave cutoff transformer described in claim 2.
[0028]
  FIG. 8 is a cross-sectional view of a molded coil according to a sixth embodiment used for a noise-cut transformer type obstruction wave cutoff transformer having a coaxial eccentric structure. The molded coil shown in FIG. 8 is formed by integrally molding the primary coil 1 of the multi-layer multi-turns with the short-circuit ring 4a formed of an extra fine mesh member close to the upper side thereof with the insulating resin 6, and the lower side thereof. Further, the secondary coil 2 having a multi-layer multi-turn number, in which the short-circuiting ring 4b formed of an extremely fine mesh member is disposed in the vicinity, is integrally molded with an insulating resin 6 and configured.
In short, a shield made of a substantially ring-shaped short-circuited ring as shown in FIG. 12 formed of a very fine mesh-like conductive member is disposed in proximity to one or both of the primary coil and the secondary coil. Therefore, the molded coil shown in FIG. 8 constitutes a primary coil and a secondary coil that are employed in the noise-cut transformer type obstruction wave cutoff transformer described in claim 2.
[0029]
  FIG. 9 is a cross-sectional view of a molded coil according to a seventh embodiment used in a noise cut transformer type obstruction wave cutoff transformer having a coaxial eccentric structure. That is, the molded coil shown in FIG. 9 has a cylindrical short-circuit ring 4c formed of an extra fine mesh member on its outer peripheral surface and a cylindrical short-circuit ring 4d formed of an extra fine mesh member on its inner peripheral surface. The arranged multi-turn primary coil 1 is integrally molded with an insulating resin 6, and a cylindrical short circuit ring 4e formed of an extra fine mesh member is formed on the outer peripheral surface thereof, and an extra fine mesh member is formed on the inner peripheral surface thereof. The multi-layered multi-turn secondary coil 2 in which the cylindrical short-circuiting rings 4f are arranged in close proximity to each other is integrally molded. The cylindrical short-circuit rings 4c to 4f are all conductive short-layer short-circuit rings having a thickness of 0.1 to 100 μm.
In short, at least on the peripheral surface of the primary coil 1, a shield made of an ultrafine mesh conductive member is disposed. Therefore, the molded coil shown in FIG. 9 constitutes a primary coil and a secondary coil that are employed in the noise cut transformer type obstruction wave blocking transformer described in claim 1.
[0030]
  FIG. 10 is a cross-sectional view of a molded coil according to an eighth embodiment used for a noise-cut transformer type obstruction wave blocking transformer having a coaxial eccentric structure. The molded coil shown in FIG. 10 is formed by integrally molding a primary coil 1 having a multi-layer multi-turn number, in which a shield 4g made of a short-circuited ring formed of an ultrafine mesh member is disposed on the entire peripheral surface, with an insulating resin 6, and is extremely fine. The secondary coil 2 having a multi-layered multi-turn structure in which a shield 4h made of a short-circuited ring formed of a mesh member is disposed on the entire peripheral surface is integrally molded with an insulating resin 6. Each of the shields 4g and 4h is a shield made of a short-circuited ring of a conductive thin layer having a thickness of 0.1 to 100 μm.
In short, at least on the peripheral surface of the primary coil 1, a shield made of an ultrafine mesh conductive member is disposed. Therefore, the molded coil shown in FIG. 10 constitutes a primary coil and a secondary coil that are employed in the noise cut transformer type obstruction wave cutoff transformer described in claim 1.
[0031]
  Used in the noise cut transformer type obstruction wave cutoff transformer shown in FIGS.Made of extra fine mesh conductive memberThe shield 4 (including 4a to 4h, the same shall apply hereinafter) is a mesh tape made of thin metal wires, a conductive fiber made by weaving a good conductive material such as nylon and silver, and a woven fabric made of copper. Conductive fiber coated with a good conductive material such as nickel, conductive fiber coated with a non-woven fabric with a good conductive material such as copper or nickel, mesh tape with a thin metal wire formed into a bag, or copper having a shape as shown in FIG. -A shield made of an ultra-fine mesh member such as an expanded metal such as copper alloy or aluminum, and the thickness of the conductive portion is reduced to the skin depth due to the skin effect of the induced current in the high-frequency region of the disturbing wave for which resonance is to be suppressed. Are approximately equal or less.
[0032]
  In particular, it is used in the noise cut transformer type obstruction wave cutoff transformer shown in FIG. 3, FIG. 4, FIG. 7, and FIG.Made of extra fine mesh conductive memberThe short-circuited ring has a substantially ring shape as shown in FIG. 12, and the thickness of the conductive portion is substantially equal to or less than the skin depth due to the skin effect of the induced current in the high-frequency region of the disturbance wave for which resonance is to be suppressed. belongs to.
[0033]
  Note that the basic configuration is the same as that of the noise-cut transformer type obstruction wave blocking transformer coil shown in FIG. 5, FIG. 6, FIG. 9, or FIG. A coil and a core that forms a magnetic path between the primary coil and the secondary coil, and at least a shielding body formed of a fine mesh conductive member is disposed on the peripheral surface of the primary coil. Further, the noise-cut transformer type disturbance wave cutoff transformer according to the present invention is characterized in that the primary coil and the secondary coil are molded with an insulating resin together with the shield. It is a vessel. The shield in this case does not function as a short-circuiting ring, but simply functions as a shield, but a mesh tape made by knitting thin metal wires, and conductive fibers made by weaving a good conductive material such as nylon and silver , Conductive fiber coated with a good conductive material such as copper / nickel, woven fabric, conductive fiber coated with a good conductive material such as copper or nickel, nonwoven fabric, mesh tape with thin metal wires knitted in a bag, or FIG. It is a shield formed of an ultrafine mesh member such as an expanded metal such as copper, copper alloy, or aluminum having a shape as shown.
[0034]
  Here, the shielding effect of the shield formed of the above-described ultrafine mesh conductive member will be described with reference to specific numerical values with reference to FIG. 16, FIG. 17, and FIG.
[0035]
  FIG. 16 is a graph showing the shielding effect of two copper plates having a thickness of 100 μm and a thickness of 10 μm on one side with no gap at all. The horizontal axis of the logarithmic scale represents frequency and equal intervals. The vertical axis of the scale represents the attenuation at a position very close to 1 mm from the radiation source of the electric field.
[0036]
  That is, in FIG. 16, the absorption loss of the electric field by a copper plate having a thickness of 100 μm with no gap at all is 41.6 dB at 10 MHz, 131.6 dB at 100 MHz, and 416.2 dB at 1 GHz. Less. However, the reflection loss becomes larger as the frequency becomes lower, regardless of the thickness of the copper plate, such as 171.7 dB at 10 MHz, 141.7 dB at 100 MHz, and 111.7 dB at 1 GHz. The total of the absorption loss and the reflection loss is the total loss, and this is the attenuation of the electric field of the copper plate. When this is expressed as an attenuation factor, the sign is minus, and the attenuation factor of a copper plate having a thickness of 100 μm is −213.3 dB at 10 MHz, −273.3 dB at 100 MHz, and −527.9 dB at 1 GHz. As can be seen from the characteristic curve of the total loss of the copper plate having a thickness of 100 μm, it does not fall below −200 dB (1/10 billion in terms of magnification) even at the point where the attenuation rate is the worst.
[0037]
  In FIG. 16, the absorption loss of a copper plate having a thickness of 10 μm with no gaps is 4.16 dB at 10 MHz, 13.16 dB at 100 MHz, and 41.62 dB at 1 GHz, but the reflection loss is 10 MHz. 171.7 dB at 100 MHz, 111.7 dB at 1 GHz, and 111.7 dB at 1 GHz. Therefore, the attenuation factor of the 10 μm thick copper plate is −175.9 dB at 10 MHz, −154.9 dB at 100 MHz, and 15 GHz-153.3 dB. Become. As can be seen from the characteristic curve of the total loss of a copper plate having a thickness of 10 μm, even a thickness of 10 μm does not fall below −150 dB (31.65 million in terms of magnification).
[0038]
  In short, FIG. 16 shows that an electric field can be attenuated by −150 dB or more even at a position as close as 1 mm from the radiation source of an electric field, even if it is a 10 μm thin copper plate with no gap at all. Show.
[0039]
  On the other hand, in the case of an extremely fine mesh-like conductive member with a large number of gaps and non-uniform conductivity, this cannot be included in the calculation. The shielding effect of the sample was as shown in FIG. 17 and FIG.
[0040]
  That is, the attenuation rate of the aluminum expanded net having 97 holes per square centimeter and a thickness of 50 μm is −38 dB to −54 dB in the high frequency band from 100 MHz to 1 GHz as shown by the curve in FIG. Met.
[0041]
  Further, the attenuation rate of the copper expanded network having 178 openings per square centimeter and a thickness of 100 μm is −48 dB to −71 dB in the high frequency band from 100 MHz to 1 GHz as shown by the curve in FIG. Met.
[0042]
  Further, the attenuation rate of the 80-90 μm thick silver yarn weaved woven fabric with the open mesh 22 was −41 dB to −61 dB in the high frequency band from 100 MHz to 1 GHz, as shown by the curve in FIG. .
[0043]
  Furthermore, the attenuation rate of the copper / tin-plated wire mesh tape with a bag network of 35 holes per square centimeter and a thickness of 540 μm is a high frequency of 100 MHz to 1 GHz as shown by the curve in FIG. The band was -44 dB to -62 dB.
[0044]
  Furthermore, the attenuation rate of the copper / nickel-plated woven fabric having a thickness of 100 to 200 μm was −52 dB to −85 dB in the high frequency band from 100 MHz to 1 GHz as shown by the curve in FIG.
[0045]
  In short, in a high frequency band of frequencies from 100 MHz to 1 GHz, a shield formed of a typical ultrafine mesh-like conductive member, even at a position as close as 1 mm from the radiation source of the electric field, has no gap at all. Although the attenuation rate is several orders of magnitude lower than that of the copper plate, it has been found that an attenuation rate of −38 dB or more sufficient as a practical shielding effect is achieved. Needless to say, if necessary, the attenuation factor can be improved by providing multiple layers with a porous or fibrous insulating layer in between.
[0046]
  Next, the manufacturing method of the mold coil which comprises the obstruction wave cutoff transformer which concerns on this invention is demonstrated. The mold coil according to the present invention includes, for example, a preparation stage in which a primary coil 1 and a secondary coil 2 are set together with a shield in a mold, and a mold in which the primary coil 1, the secondary coil 2 and the shield are set. It is manufactured by a casting method comprising a synthetic insulating resin liquid injection process in which a synthetic insulating resin liquid is injected and bubbles are drawn by vacuum, and a curing process is performed. The curing process includes a heat curing process performed as necessary. In the present invention, since the shielding body is formed of the above-described ultrafine mesh member, the synthetic insulating resin passes through the pores of the shielding body, reaches the inner circumferential surface from the outer peripheral surface, and further penetrates between the coil layers. The whole is solidified as a whole and does not peel off from the shield. Therefore, a molded coil having excellent thermal strength and mechanical strength is provided by a single molding operation. In addition, in the synthetic insulating resin liquid injection process, not only the synthetic insulating resin liquid, but also a synthetic insulating resin liquid mixed with a solid incombustible insulator such as quartz powder or glass fiber, etc., if necessary Is also used. By doing so, the mechanical strength can be further increased. In addition, the manufacturing method of the mold coil for the disturbance wave cutoff transformer according to the present invention is not limited to the above-described casting method.
[0047]
  Further, as easily understood from the above-described molded coil manufacturing method, the fault wave cutoff transformer according to the present invention including the molded coil is, for example, twice in the conventional coil manufacturing method described with reference to FIG. The winding time of the insulating glass tape and the three varnish-dried drying and solidification operations are no longer necessary, and the coil manufacturing time can be greatly reduced.
[0048]
  Furthermore, as easily understood from the above-described mold coil manufacturing method, a rectangular coil having a rectangular cross section is used instead of the ring-shaped coil having a rectangular cross section illustrated in FIGS. Any of the ring coil having a circular cross section, the square coil having a circular cross section, etc., the mold coil for the fault wave interrupting transformer according to the present invention having excellent thermal strength and mechanical strength in a single molding operation is provided. Of course, the manufacturing time can be greatly reduced. In short, neither the cross-sectional shape nor the planar shape of the coil nor the shape of the short-circuited ring corresponding to the planar shape of the coil has any influence on the production of the molded coil for the fault wave interrupting transformer according to the present invention.
[0049]
  As shown in FIG. 11, the core that forms the magnetic path between the primary coil 1 and the secondary coil 2 is an E-shaped core piece having a predetermined size manufactured by punching a non-directional silicon steel sheet having a thickness of 0.5 mm. It is a general one formed by laminating I-type core pieces to a predetermined thickness. By applying this core to the molded coil shown in FIGS. 3 to 10, a sufficient thermal strength and mechanical strength are required, and a shielding effect is practically required compared to a shield transformer not provided with a conventional mold. A noise-cut transformer type obstruction wave interrupting transformer, which is a mold transformer having a coaxial eccentricity structure, which does not decrease until a certain effect is lost has been provided. The same strength can be obtained by using a core obtained by cutting and stacking silicon steel sheets into strips, or using a wound core of a directional silicon steel strip. It is. In addition, the same applies to any shape according to the use for the three-phase single-phase or the like.
[0050]
  In addition, by applying this core to the molded coil shown in FIG. 1 or FIG. 2, the thermal strength and mechanical strength are high, and a shielding effect is practically necessary compared to a shield transformer that is not subjected to a conventional mold. Thus, a shield transformer type obstruction wave blocking transformer, which is a mold transformer having a coaxial concentric structure, which does not decrease until a certain effect is lost, has been provided.
[0051]
  As described above, the embodiment of the present invention will be described in detail with respect to the shield transformer type disturbance wave cutoff transformer, the coaxial concentric mold transformer, and the noise cut transformer type fault wave cutoff transformer, the coaxial eccentric structure transformer. did. However, the present invention is not limited to these embodiments. That is, for the noise-cut transformer type obstruction wave cutoff transformer, a mold transformer having a coaxial concentric structure, a different-axis eccentricity structure, or a different-axis eccentricity twist structure can be configured according to the present invention by appropriately selecting a core. . Of course, the core can also be used in a wound core.
[0052]
Delete
[0053]
[The invention's effect]
Since the noise-cut transformer type obstruction wave blocking transformer according to the present invention uses a shielding body formed of an extra fine mesh member or a shielding body made of a short-circuited ring, the shielding body is completely contained in the resin mold applied to the coil. Since the resin mold is firmly connected through the numerous holes or gaps of the shielding body, the noise-cut transformer obstruction wave blocking transformation is a mold transformer with sufficient thermal strength and mechanical strength. A vessel was provided. In addition, the short-circuit ring formed of the ultrafine mesh member has a high-frequency blocking effect that is reduced before it loses the practically necessary noise-blocking effect, as compared to a plate-like or foil-like short-circuit ring without holes or gaps. As such, performance is not a problem in practice.
[0054]
  Furthermore, in the fault wave interrupting transformer according to the present invention, the time required for manufacturing the molded coil is significantly reduced as compared with the conventional manufacturing of the coil, so that the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a molded coil according to a first embodiment used in a shield transformer type obstruction wave cutoff transformer. However, although the shield is shown with an exaggerated thickness, this is the same in the following drawings.
FIG. 2 is a cross-sectional view of a molded coil according to a second embodiment used in a shielded transformer obstruction wave cutoff transformer.
FIG. 3 is a cross-sectional view of a mold coil according to a first embodiment used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 4 is a cross-sectional view of a mold coil according to a second embodiment used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 5 is a cross-sectional view of a molded coil according to a third embodiment used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 6 is a cross-sectional view of a molded coil according to a fourth embodiment used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 7 is a cross-sectional view of a molded coil according to a fifth embodiment used in a noise cut transformer type obstruction wave blocking transformer.
FIG. 8 is a cross-sectional view of a molded coil according to a sixth embodiment used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 9 is a cross-sectional view of a molded coil according to a seventh embodiment used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 10 is a sectional view of a molded coil according to an eighth embodiment used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 11 is a perspective view of an example of a core.
FIG. 12 is a plan view of an example of a ring-shaped short-circuit ring of a conductive thin film formed of an extra fine mesh member.
FIG. 13 is a perspective view of an expanded metal used as an extra fine mesh member.
FIG. 14 is a plan view of an example of a ring-shaped short-circuited ring of a conductive thin film having no conventional gaps and pores.
FIG. 15 is a cross-sectional view of a conventional coil used in a noise cut transformer type obstruction wave cutoff transformer.
FIG. 16 is an attenuation characteristic diagram showing an electric field shielding effect by a metal plate.
FIG. 17 is an attenuation characteristic diagram showing the shielding effect of the expanded net.
FIG. 18 is a damping characteristic diagram showing the shielding effect of woven fabrics.
[Explanation of symbols]
  1 Primary coil
  2 Secondary coil
  3 core
  4, 4a-4hMade of extra fine mesh conductive memberShield
  5 Insulated copper wire
  6, 6a, 6b Insulating resin mold
  7, 7a, 7b Shield
  8 Shield
  9, 10 Insulator

Claims (3)

An annular primary coil formed by winding multiple layers of insulation-coated copper wire, an annular secondary coil formed by winding multiple layers of insulation-coated copper wire, the primary coil and the secondary coil, In the noise cut transformer type obstruction wave breaking transformer composed of a core that forms a magnetic path between them, at least on the peripheral surface of the primary coil, a shielding body made of a short-circuited ring formed of a superfine mesh conductive member. as is the thickness of the conductive portion is substantially equal to or less shields disposed skin depth by the skin effect of the induced current in the high frequency region of the fault wave to be suppressed resonance Te, further wherein said primary coil two A noise cut transformer type obstruction wave cutoff transformer, wherein the next coil is molded with an insulating resin together with the shield. An annular primary coil formed by winding multiple layers of insulation-coated copper wire, an annular secondary coil formed by winding multiple layers of insulation-coated copper wire, and the primary coil and the secondary coil From a shield made of a short-circuited ring formed of an ultrafine mesh conductive member disposed in proximity to either one or both, and a core that forms a magnetic path between the primary coil and the secondary coil In the noise cut transformer type obstruction wave cutoff transformer, the thickness of the shield is approximately equal to or less than the skin depth due to the skin effect of the induced current in the high frequency region of the obstruction wave whose resonance is to be suppressed. The noise-cut transformer type obstruction wave blocking transformer, wherein the primary coil and the secondary coil are molded with an insulating resin together with the shield . The ultra-fine mesh conductive member is a mesh tape made by knitting thin metal wires, conductive fibers made by weaving a good conductive material such as nylon and silver, and a conductive material coated with a good conductive material such as copper or nickel. A fiber, non-woven fabric coated with a good conductive material such as copper or nickel, expanded metal such as copper, copper alloy, aluminum, or mesh tape in which a thin metal wire is knitted in a bag. 1 or 2 noise cut transformer type obstruction wave cutoff transformer.

Images