Composite material-based fractional inductor device and method of manufacturing the same

Abstract

The application discloses a kind of fractional order inductor based on composite material and preparation method thereof, the fractional order inductor includes inductance magnetic core and metal coil wound on the inductance magnetic core, the inductance magnetic core includes inner ring and outer ring, wherein inner ring includes ring core of stainless steel material, and the annular seat formed by composite material is coated one annular surface of ring core, the outer ring is formed by composite material around the ring core and the annular seat, the composite material includes insulating resin matrix and metal filler distributed in the insulating resin matrix.The fractional order inductor obtained by the application has the advantages of precision, compactness and wide frequency band, and the inductance order can be adjusted by adjusting the filler content, so that it can be applied to fractional order circuit and has the potential for commercial production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fractional order inductive devices. BACKGROUND

[0002] In recent years, fractional order elements have been widely used in the fields of signal processing, biology, electrochemistry, system identification, artificial intelligence and control systems due to their superior performance, and new circuits based on fractional order elements have shown excellent performance and more flexible design freedom in these fields.

[0003] The characteristics of fractional order inductors are between resistance and traditional integer order inductors, and the voltage-current phase difference of the inductive element is only related to the order, and changing the order can change the voltage-current phase difference in the entire phase plane of 0-2π; the phase angle (θ=απ / 2) of the fractional order inductor does not change with frequency and is only related to the order of the fractional order inductor, so the fractional order inductor is also called a constant phase device. Therefore, the integer order relationship between voltage and current of traditional inductive elements is extended to fractional order, and the voltage-current relationship of fractional order inductive elements can be obtained, and the integer order inductor can be regarded as a special case of fractional order inductive elements, and the impedance of the fractional order inductor is: where ω is the angular frequency of the fractional order inductor terminal voltage or terminal current; L α is the fractional order inductor; α is the order of the fractional order inductor, 0<α<2; when α=1, the fractional order inductor is an ideal integer order inductor.

[0004] The implementation method of fractional order devices based on integer order approximation is still the mainstream method for preparing fractional order devices at present, such as the Foster-I type implementation circuit and implementation principle of a fractional order inductor using a passive implementation method as shown in the accompanying drawings. Figure 1 In the Foster-I type implementation circuit and implementation principle of a fractional order inductor using a passive implementation method as shown in the accompanying drawings, first, an integer order rational function is used to approximate the fractional order operator s α In a certain frequency band, approximation methods such as Carlson approximation, Matsuda approximation, Oustaloup approximation, Valsa approximation, and continued fraction expansion are used for approximation, and then the rational function is realized as a Cauer type or Foster type RC / RL network through network synthesis theory. This type of implementation method using integer order approximation has the disadvantages of complex structure, numerous devices, non-nominal parameters, limited precision, susceptibility to device tolerance, narrow bandwidth, and difficulty in adjustment; another existing implementation method is as shown in the accompanying drawings. Figure 2An active realization method of a fractional inductor is shown, which can realize adjustable parameters of a device by using OTAs, VDTAs, CFOAs and other active links, or by improving and optimizing parameters of an RC circuit, or by using GIC circuits or transducer circuits to transform fractional capacitor devices, etc. Such a method can solve the problems of non-adjustable parameters, non-nominal parameters, and difficulty in integration in the integer approximation realization method to some extent, but cannot overcome the problems of low rational approximation accuracy and complex circuit, and still has defects of complex structure and numerous devices. Meanwhile, the circuit links are numerous, the sensitivity and reliability are poor, the bandwidth of the GIC or transducer used for realization is limited, and the generated parasitic parameters can affect the circuit performance.

[0005] From the above preparation status of the fractional inductor, it can be seen that the current fractional inductor device can only be realized by circuit building, which has defects of complicated manufacturing steps, complex structure, numerous devices, and inflexible control. SUMMARY

[0006] In view of the defects of the prior art, the purpose of the present application is to provide a new fractional inductor device based on a composite material and a preparation method thereof. The obtained fractional inductor device can be realized without complex circuit building, has the advantages of accuracy, compactness and wide frequency band, effectively promotes the popularization and application of fractional circuits and systems, and provides a new technical concept for the preparation of fractional inductor devices.

[0007] The technical scheme of the present application is as follows:

[0008] The fractional inductor device based on a composite material comprises an inductor magnetic core and a metal coil surrounding the inductor magnetic core. The inductor magnetic core comprises an inner ring and an outer ring. The inner ring comprises a ring core formed of annular stainless steel material and a ring-shaped composite material base covering one annular surface of the ring core and leaving the other annular surface completely exposed. The composite material base has the same inner and outer diameters as the ring core. The outer ring is an annular body formed of a composite material and connected to the outer circumference of the composite material base and the outer circumference of the ring core. The height of the outer ring is equal to the height of the inner ring. The metal coil is uniformly wound on the inductor magnetic core in a single-layer winding manner using metal wires. The composite material comprises an insulating resin matrix and metal fillers distributed in the insulating resin matrix.

[0009] According to some specific embodiments of the present application, the insulating resin matrix is selected from epoxy resin and / or organic silicon resin matrix.

[0010] According to some specific embodiments of the present application, the insulating resin matrix is selected from organic silicon epoxy resin matrix.

[0011] According to some embodiments of the present application, the metal filler is selected from one or more of a stainless steel sheet, a powder, and a block.

[0012] According to some embodiments of the present application, the metal coil is selected from a copper coil.

[0013] According to some embodiments of the present application, the content of the metal filler is 0-70% of the total mass of the composite material.

[0014] According to some embodiments of the present application, the size of the inductor magnetic core is 8*25*6mm, and the size of the ring core is 8*14*1mm.

[0015] The present application further discloses a preparation method of the fractional order inductor device, which comprises:

[0016] (1) adding the metal filler into the uncured insulating resin matrix, and mixing the two to obtain a molding mixture;

[0017] (2) placing the inner core in a molding mold, then adding the molding mixture into the molding mold, and obtaining the inductor magnetic core after the molding mixture is cured;

[0018] (3) winding the metal wire around the obtained inductor magnetic core in a single-layer winding manner to form a coil structure, and obtaining the fractional order inductor device.

[0019] According to some embodiments of the present application, the insulating resin matrix comprises an epoxy resin and / or a silicone resin, and a curing agent; the metal filler is selected from one or more of a stainless steel sheet, a powder, and a block; and the metal wire is selected from a copper wire.

[0020] According to some embodiments of the present application, the diameter of the copper wire is 3.5-4.5mm.

[0021] According to some embodiments of the present application, the preparation method specifically comprises:

[0022] (1) adding a curing agent of a silicone epoxy resin adhesive into a silicone epoxy resin, and fully stirring at a rotation speed of 250-350r / min for 5-7min under normal temperature and pressure to obtain an uncured insulating resin matrix;

[0023] (2) adding nano stainless steel powder into the stirring insulating resin matrix, and obtaining a molding mixture after the stainless steel powder is uniformly dispersed;

[0024] (3) after cleaning the surface of the stainless steel ring, the ring is placed in the center of the mold, the molding mixture is injected into the mold, and the mixture is cured at 25 DEG C for 20-24 hours until a matte effect appears, to obtain the fractional order inductor magnetic core;

[0025] (4) the copper wire is tightly wound around the obtained fractional order inductor magnetic core in a single layer winding manner, to obtain the fractional order inductor device;

[0026] The weight ratio of the curing agent of the organic silicon epoxy resin glue to the organic silicon epoxy resin is 0.5-1.5:10.

[0027] The present application has the following advantages:

[0028] The fractional order inductor device of the present application can be simply and quickly prepared by using a resin composite material, has the advantages of low cost, stable performance, compactness and wide frequency band, and the fractional order inductance order can be changed from 0.7 to 0.9 by changing the filler ratio in the composite material, so that the control is convenient.

[0029] The novel fractional order inductor device obtained by the present application has the conditions for application in fractional order circuits and the possibility of commercial production, can provide new choices for traditional filter circuits, oscillator circuits, resonant circuits and the like, can greatly promote the popularization and application of fractional order circuits and systems, promote the development and improvement of electrical network theory, and can be used for studying the passivity, reciprocity and other properties of fractional order inductor devices, thereby laying a solid technical support for the application of fractional order calculus theory in scientific and engineering fields. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a Foster-I type implementation circuit and implementation schematic diagram of fractional order inductance in the prior art.

[0031] Figure 2 It is an active implementation structure of fractional order inductance in the prior art.

[0032] Figure 3 It is a display diagram of the fractional order inductor magnetic core described in embodiment 1.

[0033] Figure 4 It is a display diagram of the fractional order inductor described in embodiment 1.

[0034] Figure 5 It is a three-view diagram of the fractional order inductor described in embodiment 1.

[0035] Figure 6 It is a phase angle comparison diagram of the fractional order inductor example in embodiment 2.

[0036] Figure 7 It is a graph of the amplitude-frequency characteristic test results in embodiment 2.

[0037] Figure 8 Figure for the phase-frequency characteristic test result in Example 2. DETAILED DESCRIPTION

[0038] The present application is described in detail below with reference to the embodiments and drawings, but it should be understood that the embodiments and drawings are only used to exemplarily describe the present application, and cannot constitute any limitation to the protection scope of the present application. All reasonable transformations and combinations within the inventive concept of the present application fall into the protection scope of the present application.

[0039] Example 1

[0040] The fractional-order inductor is prepared as shown in the accompanying drawings. Figures 3-5 The fractional-order inductor includes an inductor magnetic core and a metal coil 3 surrounding the inductor magnetic core, wherein the inductor magnetic core includes an inner ring 1 and an outer ring 2, the inner ring 1 includes a ring core formed of annular stainless steel material and an annular composite material base covering one annular surface of the ring core and leaving the other annular surface of the ring core completely exposed, the composite material base has the same inner and outer diameters as the ring core, the outer ring 2 is an annular body formed of the same composite material and connected to the outer circumferences of the composite material base and the ring core, the height H of the outer ring 2 is equal to the height of the inner ring 1 and higher than the composite material base, and both surfaces of the inner ring 1 and the outer ring 2 are flat surfaces, the metal coil 3 is uniformly wound on the inductor magnetic core in a single-layer winding manner using metal wires.

[0041] Specifically, in the present embodiment, the inner diameter of the inner ring 1 of the inductor is 8 mm, the outer diameter is 14 mm, the inner diameter of the outer ring 2, i.e., the outer diameter of the inner ring 1, is 14 mm, the outer diameter of the outer ring 2 is 25 mm, the height of the outer ring 2 is 6 mm, the height h of the ring core is 1 mm, and the metal wires are wound on the inductor magnetic core in a single-layer tight winding manner for 50 turns.

[0042] Specific preparation steps include:

[0043] (1) The epoxy resin glue A component is weighed and placed in a container, and stirred for half a minute to uniformly disperse the raw materials sinking to the bottom;

[0044] (2) The B component epoxy resin curing agent is weighed and poured into the A component, and fully stirred at 25°C, 101 kpa, and a rotation speed of 300 r / min for 6 min to fully mix the A and B components to obtain a reaction mixture; wherein the weight ratio of the A component to the B component is 10:1;

[0045] (3) The nano stainless steel powder is slowly added into the stirring reaction mixture, and continues to be stirred for 3 min to uniformly disperse the stainless steel powder to obtain a molding mixture;

[0046] (4) After cleaning the surface of the stainless steel ring, place it in the inductor mold, inject the molding mixture into the mold to cover the surface of the stainless steel ring, and cure at 25°C for 20-24 hours until the matte effect is fully achieved, resulting in the product shown in the attached image. Figure 3 The fractional-order inductor core shown;

[0047] (5) Select copper wire with a diameter of 4mm, and tightly wind the obtained fractional-order inductor core using a single-layer winding method to obtain the following result. Figure 4 The fractional-order inductance shown.

[0048] Component A is the resin matrix of 9110 silicone epoxy resin potting compound, and component B is the curing agent of 9110 silicone epoxy resin potting compound.

[0049] The inner diameter * outer diameter * thickness of the outer ring of the fractional-order inductor core is 14 * 25 * 6 mm. The inner ring and outer ring have the same thickness, and their inner diameter * outer diameter * thickness is 8 * 14 * 6 mm. The core is a stainless steel ring with a specification of 8 * 14 * 1 mm, and the stainless steel used is 304 stainless steel. The outer ring is an epoxy resin matrix doped with nano-metal particles, which coats the stainless steel core. The nano-metal particles are spherical nano-stainless steel powder with the same composition as the core, that is, the nano-metal particles used are 304 stainless steel nanoparticles.

[0050] Example 2

[0051] Multiple fractional-order inductors formed from composite materials doped with different amounts of stainless steel powder were prepared according to the preparation steps in Example 1, wherein the stainless steel ring was formed from a ring-shaped 304 stainless steel sheet. Impedance spectrum measurements were performed using an Aglient 4395A network spectrum analyzer. The initial test frequency band was selected as 1kHz-50MHz. After identifying the frequency band with a constant phase angle, the instrument was recalibrated, and the constant phase frequency band was then updated for testing. The fractional-order characteristics of the inductor in this frequency band were obtained. The measurement results are attached. Figures 6-8 And as shown in the table below:

[0052]

[0053] It can be seen that the order of the fractional inductor can be changed by using composite materials. Specifically, by changing the filler ratio of the composite material, the order of the fractional inductor can be changed from 0.7 to 0.9. By increasing the mass fraction of stainless steel powder in the composite material, the constant phase angle of the fractional inductor can be adjusted from 66° to 75° in the frequency band of hundreds of kilohertz.

[0054] The above examples are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above examples. Any technical scheme falling within the concept of the present application belongs to the protection scope of the present application. It should be pointed out that improvements and refinements made by those of ordinary skill in the art without departing from the principles of the present application should also be considered as falling within the protection scope of the present application.

Claims

1. A fractional inductive device based on a composite material, characterized in that, The inductor comprises an inductor magnetic core and a metal coil surrounding the inductor magnetic core; the inductor magnetic core comprises an inner ring and an outer ring, wherein the inner ring comprises a ring core formed of annular stainless steel material and an annular composite material base covering one annular surface of the ring core and leaving the other annular surface of the ring core completely exposed, the composite material base having the same inner and outer diameters as the ring core; the outer ring is an annular body formed of composite material and connected to the outer periphery of the composite material base and the outer periphery of the ring core; the height of the outer ring is equal to the height of the inner ring; the metal coil is uniformly wound on the inductor magnetic core in a single-layer winding manner; the composite material comprises an insulating resin matrix and metal fillers distributed in the insulating resin matrix; the metal fillers are selected from one or more of stainless steel sheet, stainless steel powder and stainless steel block, and the metal coil is a copper coil.

2. The fractional inductor device of claim 1, wherein, The insulating resin matrix is selected from an epoxy resin and / or an organic silicon resin matrix.

3. The fractional inductor device of claim 2, wherein, The insulating resin matrix is selected from an organic silicon epoxy resin matrix.

4. The fractional inductor device of claim 1, wherein, The content of the metal fillers accounts for 50-70% of the total mass of the composite material.

5. The fractional inductor device of claim 1, wherein, The inner diameter*outer diameter*thickness of the inductor magnetic core is 8mm*25mm*6mm, and the inner diameter*outer diameter*thickness of the ring core is 8mm*14mm*1mm.

6. The method of claim 1-5, wherein, The inductor comprises: (1) adding a curing agent of an organic silicon epoxy resin adhesive to an organic silicon epoxy resin, and fully stirring at a rotation speed of 250-350 r / min for 5-7 min at normal temperature and pressure to obtain an uncured insulating resin matrix; (2) adding nano stainless steel powder to the stirring insulating resin matrix until the stainless steel powder is uniformly dispersed to obtain a molding mixture; (3) cleaning the surface of a stainless steel ring and placing it in the center of a mold, injecting the molding mixture into the mold, and curing at 25°C for 20-24 h until a matte effect appears to obtain the inductor magnetic core; (4) tightly winding a copper wire around the inductor magnetic core in a single-layer winding manner to obtain the fractional order inductor device; The weight ratio of the curing agent of the organic silicon epoxy resin adhesive to the organic silicon epoxy resin is 0.5-1.5:

10.

7. The preparation method according to claim 6, characterized in that, The diameter of the copper wire is 3.5-4.5 mm.

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