A multiphase inductive material

Abstract

The application relates to a multi-phase inductance material, relates to the field of inductance elements, and comprises a magnet group and a winding, adjacent coils of the winding are wound in opposite directions, and the winding extends out of the magnet group to form an electrode; the magnet group comprises coil internal and peripheral magnets, inter-group magnets and electrode bottom magnets, raw materials for preparing the coil internal and peripheral magnets comprise an iron-based alloy I and FeSi, the iron-based alloy I comprises the following components in mass percentage: 4-6% of Si, 0.5-2% of Zr, and the balance of iron; the particle size of the iron-based alloy I is 5-15 mu m. The application has the effects of improving the quality factor of the inductance material and reducing the loss, and can meet the core requirements of low loss, fast response and high stability of power devices in a high-frequency and large-current scene.

Description

Technical Field

[0001] This application relates to the field of inductor components, and in particular to a multiphase inductor material. Background Technology

[0002] With the continuous advancement of technology, the integration of mobile phones and AI technology is deepening. This combination has significantly increased the overall performance requirements of mobile phones, leading to a substantial increase in power consumption. Simultaneously, components are trending towards miniaturization. Against this backdrop, power supplies are demanding increasingly higher power density from their components. To meet this need, multiphase integrated inductors have emerged and are gradually being widely used in related fields. The advent of multiphase integrated inductors has alleviated the pressure on power density to some extent, providing strong support for the high-performance operation of electronic devices.

[0003] Before the development of multiphase inductor technology, the industry typically employed conventional methods to address similar power and device miniaturization issues. For example, to increase power density, circuit layout might be optimized, and component placement rationally arranged to reduce space occupation and improve energy transfer efficiency. When dealing with inductance-related issues, magnet materials would be improved, using materials with higher permeability to enhance inductance performance. The winding method would also be adjusted, experimenting with different numbers of turns and winding patterns to adapt to varying power requirements. Additionally, auxiliary components such as capacitors and resistors would be added to the circuit to adjust parameters and ensure stable power output.

[0004] However, these conventional methods in the existing technology have obvious drawbacks. With the widespread application of multiphase inductors, the coupling problems between inductors and the high magnetic flux density under high current have become increasingly prominent. These problems lead to a significant increase in inductor losses, especially the hysteresis losses of multiphase inductors under high current conditions, which seriously affect the performance of the inductor and the efficiency of the power supply. They cannot adequately meet the requirements of current electronic devices for power devices in high-frequency environments, and therefore need to be improved. Summary of the Invention

[0005] To improve the performance of inductor materials, this application provides a multiphase inductor material.

[0006] The multiphase inductor material provided in this application adopts the following technical solution: A multiphase inductor material includes a magnet assembly and a winding, wherein adjacent coils of the winding are wound in opposite directions, and the winding extends outward from the magnet assembly to form an electrode; the magnet assembly includes magnets inside and around the coil, magnets between the groups, and magnets at the bottom of the electrodes; the raw materials for preparing the magnets inside and around the coil include iron-based alloy I and FeSi, wherein the iron-based alloy I comprises the following components by mass percentage: 4-6% Si, 0.5-2% Zr, and the balance being iron; the particle size of the iron-based alloy I is 5-15 μm.

[0007] High-frequency performance is optimized through the coordinated design of magnets and windings. The adjacent coils of the winding adopt a reverse winding structure, which can effectively suppress eddy current losses caused by proximity effect. The magnet partitioning design provides an optimized low magnetic reluctance flux path, enhances flux concentration and reduces leakage flux loss. The magnets inside and around the coil adopt a composite system of specific iron-based alloy and FeSi. The introduction of zirconium into the iron-based alloy helps to refine the grains and strengthen the grain boundaries. Combined with micron-level grain size control, it synergistically improves permeability and resistivity, suppresses high-frequency eddy current loss and hysteresis loss, and finally achieves low impedance and high-efficiency energy transmission at the electrode epitaxy, improving the overall performance of the inductor material under high-frequency conditions.

[0008] Preferably, the surface of the winding coil includes an oxide layer, which includes chromium oxide and aluminum oxide.

[0009] A composite oxide layer of chromium oxide and aluminum oxide is constructed on the winding surface. The density of chromium oxide provides a good physical barrier and passivation protection, slowing down oxidation. At the same time, the high insulation and thermal stability of aluminum oxide work synergistically to effectively improve the electrical insulation strength and voltage withstand capability of the winding, reducing energy loss caused by capacitive coupling. The surface protection provided by the oxide layer also helps maintain the conductivity of the conductor and enhances the insulation reliability of the coil in high-temperature environments, reducing interlayer losses of the winding and maintaining its long-term operational stability, thereby improving the quality factor of the inductor material.

[0010] Preferably, the thickness of the oxide layer is 0.01-0.1 μm.

[0011] The ultra-thin, continuous chromium oxide-alumina composite layer helps to minimize the additional dielectric loss and parasitic capacitance effect that the insulation layer itself may introduce under high-frequency electric fields while maintaining good conductivity of the winding. At the same time, the thickness of the chromium oxide-alumina composite layer can effectively prevent oxygen ions in the environment from penetrating into the conductor and the outward migration of conductor metal atoms, thereby helping to delay the oxidation and degradation process of the coil surface and playing a positive role in maintaining the long-term conductivity and stability of the conductor.

[0012] Preferably, the FeSi comprises the following components by mass percentage: 3.5-6.5% Si, with the balance being iron, and the FeSi has a particle size of 3-5 μm.

[0013] The FeSi ratio described above improves the alloy resistivity through the solid solution effect of silicon, which helps suppress high-frequency eddy current losses. At the same time, this silicon content range helps to achieve a balance between reducing eddy current losses and maintaining high permeability, ensuring magnetic flux transmission efficiency. The aforementioned particle size structure effectively improves the overall resistivity of the material by increasing the grain boundary area, further enhancing the limitation effect on eddy current losses. The synergistic effect of composition and particle size helps to reduce the total iron loss of the material under high-frequency operating conditions, improve the quality factor of the inductor and reduce its power consumption, and the material can maintain relatively stable magnetic properties at high temperatures.

[0014] Preferably, the FeSi accounts for 20-50% of the mass of the magnet inside and around the coil.

[0015] The aforementioned proportion range allows the high resistivity of FeSi to complement the permeability of iron-based alloy I. FeSi preferentially carries high-frequency eddy currents and utilizes its high resistivity to cut off energy dissipation paths, reducing iron losses. At the same time, iron-based alloy I maintains efficient transmission of the main magnetic flux channel, ensuring magnetic flux transmission efficiency. This composition ratio helps to improve the quality factor of the inductor material.

[0016] Preferably, the raw material for preparing the inter-group magnet includes iron-based alloy II, which comprises the following components in mass percentage: 4-6% Si, 5-10% Cr, 0.5-2% Zr, with the balance being iron; the particle size of the iron-based alloy II is 1-5 μm.

[0017] The addition of chromium and zirconium to iron-based alloy II forms a high-resistivity phase, which increases the material resistivity to hinder eddy current loops induced by stray magnetic fields between windings and reduce gap leakage magnetic loss. Its ultra-fine particle size design strengthens the domain wall pinning effect by increasing grain boundary density, weakens the domain flipping hysteresis under high-frequency oscillation, and reduces hysteresis loss. The dual regulation of composition and particle size enables iron-based alloy II to form a dispersed high magnetoresistivity structure in an alternating magnetic field. While maintaining the continuity of the magnetic circuit to ensure magnetic flux transmission efficiency, it suppresses high-frequency energy dissipation caused by eddy currents and hysteresis effects in the winding gap. Thus, by synergistically reducing the two types of losses, the quality factor of the inductor material is improved and the core temperature rise is reduced.

[0018] Preferably, the raw materials for preparing the bottom magnet of the electrode include iron-based alloy III, MnO2 and ZnO2, wherein the iron-based alloy III comprises the following components in mass percentage: 4-6% Si, 1-10% Cr, 0.5-2% Zr, and the balance being iron.

[0019] During heat treatment, chromium is oxidized to form a dense chromium oxide insulating layer, which, together with the nano-separated phase formed by zirconium segregation grain boundaries, improves the resistivity and rust resistance of the material and suppresses eddy current losses in the electrode region. The uniform distribution of zirconium in the iron matrix produces a magnetic dilution effect, which delays the magnetic saturation process and reduces the permeability decay and iron loss under high current conditions. The added MnO2 and ZnO2, as non-magnetic phases, optimize the magnetic coupling coefficient between adjacent inductors by controlling the local permeability of the composite material, avoiding the response hysteresis problem caused by excessive coupling, and synergistically achieving low loss and high dynamic response performance of inductor devices in high-frequency and high-power scenarios.

[0020] Preferably, the iron-based alloy III accounts for 94-98% of the mass of the bottom magnet of the electrode.

[0021] The high proportion of iron-based alloy III helps to form a continuous structure with high resistivity, increasing the overall resistivity of the material, limiting the amplitude and range of eddy currents generated in the electrode area under high-frequency alternating magnetic field, reducing eddy current loss, and combined with a low proportion of nano-dispersed oxides, helps to maintain the effective permeability level of the composite material and ensure the magnetic flux transmission efficiency under high current density; the dispersed nano-oxides reduce hysteresis loss by occupying grain boundary positions, which helps to improve the quality factor of the inductor material.

[0022] Preferably, the MnO2 and ZnO2 are spherical particles with a particle size of 0.2-0.5 μm.

[0023] The spherical geometry endows the particles with uniform surface curvature and packing characteristics, reducing local electric field distortion at the composite interface and suppressing high-frequency polarization loss. The submicron-sized particles ensure that the oxide phase is distributed in a highly dispersed state at the grain boundaries of the iron-based alloy III, increasing the domain wall migration energy barrier by increasing the grain boundary pinning density and reducing hysteresis loss. The synergistic optimization of morphology and particle size forms a dense insulating barrier, suppressing conductivity degradation caused by ion migration, while maintaining the continuity of the magnetic flux path, thereby reducing the overall energy dissipation in the electrode region and improving the quality factor of the inductor material.

[0024] Preferably, the mass ratio of MnO2 to ZnO2 is 1:(0.5-3).

[0025] At the above ratio, the high dielectric constant of MnO2 and the high insulating strength of ZnO2 complement each other, balancing the dielectric constant and electric field breakdown capability of the composite material and reducing high-frequency polarization loss; the high resistivity of ZnO2 synergistically suppresses leakage current and reduces energy consumption under DC bias; both are non-magnetic particles dispersed at the grain boundaries of the iron-based alloy III, increasing resistivity by dividing the magnetic matrix, suppressing eddy current loss, and helping to reduce iron loss and improve the material quality factor.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. High-frequency performance optimization is achieved through the synergistic design of magnets and windings. The adjacent coils of the winding adopt a reverse winding structure, which can effectively suppress eddy current losses caused by proximity effect. The magnet partitioning design provides an optimized low magnetic reluctance flux path, enhances flux concentration and reduces leakage flux loss. The magnets inside and around the coil adopt a composite system of specific iron-based alloy and FeSi. The introduction of zirconium into the iron-based alloy helps to refine the grains and strengthen the grain boundaries. Combined with micron-level grain size control, it synergistically improves permeability and resistivity, suppresses high-frequency eddy current loss and hysteresis loss, and finally achieves low impedance and high-efficiency energy transmission at the electrode epitaxy, improving the overall performance of the inductor material under high-frequency conditions.

[0027] 2. During heat treatment, chromium is oxidized to form a dense chromium oxide insulating layer, which, together with the nano-separated phase formed by zirconium segregation grain boundaries, improves the resistivity and rust resistance of the material and suppresses eddy current loss in the electrode area. The uniform distribution of zirconium in the iron matrix produces a magnetic dilution effect, which delays the magnetic saturation process and reduces the permeability decay and iron loss under high current conditions. The added MnO2 and ZnO2, as non-magnetic phases, optimize the magnetic coupling coefficient between adjacent inductors by controlling the local permeability of the composite material, avoiding the response hysteresis problem caused by excessive coupling, and synergistically achieving low loss and high dynamic response performance of inductor devices in high-frequency and high-power scenarios. Attached Figure Description

[0028] Figure 1 The structural cross-sections of the embodiments and comparative examples of the present invention. Figure 1 ; Figure 2 The structural cross-sections of the embodiments and comparative examples of the present invention. Figure 2 ; Figure 3 This is a bottom view of an embodiment and a comparative example of the present invention; Explanation of reference numerals in the attached diagram: 1. Magnet group; 11. Magnet inside and around the coil; 12. Magnet between groups; 13. Magnet at the bottom of the electrode; 2. Winding. Detailed Implementation

[0029] This application discloses a multiphase inductor material. Unless otherwise specified, all raw materials used in this application are commercially available. The following detailed description, in conjunction with embodiments and accompanying drawings, further illustrates this application: Referring to the attached diagram, Figure 1 and Figure 2 These are cross-sectional views of Examples 1-3 and Comparative Examples 1-3. Figure 3The images show bottom views of Examples 1-3 and Comparative Examples 1-3. A multiphase inductor material includes a magnet assembly 1 and a winding 2. Adjacent coils of the winding 2 are wound in opposite directions. The winding 2 extends outward from the magnet assembly 1 to form an electrode. The surface of the coil of the winding 2 includes an oxide layer, which includes chromium oxide and aluminum oxide. The thickness of the oxide layer is 0.01-0.1 μm. Magnet assembly 1 includes magnets 11 inside and around the coil, magnets 12 between assemblies, and magnets 13 at the bottom of the electrodes. The magnets 11 inside and around the coil are made from iron-based alloy I and FeSi. Iron-based alloy I comprises the following components by mass percentage: 4-6% Si, 0.5-2% Zr, with the balance being iron; the particle size of iron-based alloy I is 5-15 μm. FeSi comprises the following components by mass percentage: 3.5-6.5% Si, with the balance being iron; the particle size of FeSi is 3-5 μm. FeSi accounts for 20-50% of the mass of magnets 11 inside and around the coil. The magnets 12 between assemblies are made from iron-based alloy II. Iron-based alloy II comprises the following components by mass percentage: 4-6% Si, 5-10% Cr, 0.5-2% Zr, with the balance being iron; the particle size of iron-based alloy II is 1-5 μm. The raw materials for preparing the bottom magnet 13 of the electrode include iron-based alloy III, MnO2 and ZnO2. The iron-based alloy III includes the following components in mass percentage: 4-6% Si, 1-10% Cr, 0.5-2% Zr, and the balance is iron. The iron-based alloy III accounts for 94-98% of the mass of the bottom magnet 13 of the electrode. MnO2 and ZnO2 are spherical particles with a particle size of 0.2-0.5 μm and a mass ratio of MnO2 to ZnO2 of 1:(0.5-3).

[0030] Example 1 A multiphase inductor material includes a magnet assembly and windings. Adjacent coils of the windings are wound in opposite directions, and electrodes are formed by extending the magnet assembly outwards from the windings. The surface of the winding coils includes an oxide layer composed of chromium oxide and aluminum oxide in a mass ratio of 3:1, with a thickness of 0.01 μm. The magnet assembly includes internal and peripheral magnets, inter-assembly magnets, and bottom magnets of the electrodes. The raw materials for preparing the internal and peripheral magnets include iron-based alloy I and FeSi. Iron-based alloy I comprises the following components by mass percentage: 92% Fe, 6% Si, 2% Zr, with the balance being iron; the particle size of iron-based alloy I is 15 μm. FeSi comprises the following components by mass percentage: 96.5% Fe, 3.5% Si; the particle size of FeSi is 3 μm, and FeSi accounts for 50% of the mass of the internal and peripheral magnets. The raw materials for preparing the inter-group magnet include iron-based alloy II, which comprises the following components by mass percentage: 90.5% Fe, 4% Si, 5% Cr, and 0.5% Zr; the particle size of iron-based alloy II is 5 μm. The raw materials for preparing the bottom electrode magnet include iron-based alloy III, MnO2, and ZnO2. Iron-based alloy III comprises the following components by mass percentage: 95% Fe, 4% Si, 1% Cr, and 0.5% Zr; iron-based alloy III accounts for 94% of the mass of the bottom electrode magnet; MnO2 and ZnO2 are spherical particles with a particle size of 0.2 μm, and the mass ratio of MnO2 to ZnO2 is 1:3.

[0031] Example 2 A multiphase inductor material includes a magnet assembly and windings. Adjacent coils of the windings are wound in opposite directions, and electrodes are formed by extending the magnet assembly outwards from the windings. The surface of the winding coils includes an oxide layer composed of chromium oxide and aluminum oxide in a mass ratio of 3:1, with a thickness of 0.05 μm. The magnet assembly includes internal and peripheral magnets, inter-assembly magnets, and bottom magnets of the electrodes. The raw materials for preparing the internal and peripheral magnets include iron-based alloy I and FeSi. Iron-based alloy I comprises the following components by mass percentage: 93.5% Fe, 5% Si, 1.5% Zr, with the balance being iron; the particle size of iron-based alloy I is 10 μm. FeSi comprises the following components by mass percentage: 94.5% Fe, 5.5% Si; the particle size of FeSi is 4 μm, and FeSi accounts for 30% of the mass of the internal and peripheral magnets. The raw materials for preparing the inter-group magnet include iron-based alloy II, which comprises the following components by mass percentage: 85.5% Fe, 5% Si, 8% Cr, and 1.5% Zr; the particle size of iron-based alloy II is 3 μm. The raw materials for preparing the bottom electrode magnet include iron-based alloy III, MnO2, and ZnO2. Iron-based alloy III comprises the following components by mass percentage: 86.5% Fe, 5% Si, 7% Cr, and 1.5% Zr; iron-based alloy III accounts for 96% of the mass of the bottom electrode magnet; MnO2 and ZnO2 are spherical particles with a particle size of 0.4 μm, and the mass ratio of MnO2 to ZnO2 is 2:1.

[0032] Example 3 A multiphase inductor material includes a magnet assembly and windings. Adjacent coils of the windings are wound in opposite directions, and electrodes are formed by extending the magnet assembly outwards from the windings. The surface of the winding coils includes an oxide layer composed of chromium oxide and aluminum oxide in a mass ratio of 3:1, with a thickness of 0.1 μm. The magnet assembly includes internal and peripheral magnets, inter-assembly magnets, and bottom magnets of the electrodes. The raw materials for preparing the internal and peripheral magnets include iron-based alloy I and FeSi. Iron-based alloy I comprises the following components by mass percentage: 95.5% Fe, 4% Si, 0.5% Zr, with the balance being iron; the particle size of iron-based alloy I is 5 μm. FeSi comprises the following components by mass percentage: 93.5% Fe, 6.5% Si; the particle size of FeSi is 5 μm, and FeSi accounts for 20% of the mass of the internal and peripheral magnets. The raw materials for preparing the inter-group magnet include iron-based alloy II, which comprises the following components by mass percentage: 82% Fe, 6% Si, 10% Cr, and 2% Zr; the particle size of iron-based alloy II is 1 μm. The raw materials for preparing the bottom electrode magnet include iron-based alloy III, MnO2, and ZnO2. Iron-based alloy III comprises the following components by mass percentage: 84% Fe, 6% Si, 10% Cr, and 2% Zr; iron-based alloy III accounts for 98% of the mass of the bottom electrode magnet; MnO2 and ZnO2 are spherical particles with a particle size of 0.5 μm, and the mass ratio of MnO2 to ZnO2 is 1:1.

[0033] Comparative Example 1 A multiphase inductor material includes a magnet assembly and windings. Adjacent coils of the windings are wound in the same phase, and the magnet assembly extends outward from the windings to form electrodes. The surface of the winding coils includes an oxide layer composed of chromium oxide and aluminum oxide in a mass ratio of 3:1, with a thickness of 0.01 μm. The magnet assembly includes internal and peripheral magnets of the coils, inter-assembly magnets, and bottom magnets of the electrodes. The raw materials for preparing the internal and peripheral magnets of the coils include iron-based alloy I and FeSi. Iron-based alloy I comprises the following components by mass percentage: 92% Fe, 6% Si, 2% Zr, with the balance being iron; the particle size of iron-based alloy I is 15 μm. FeSi comprises the following components by mass percentage: 96.5% Fe, 3.5% Si; the particle size of FeSi is 3 μm, and FeSi accounts for 50% of the mass of the internal and peripheral magnets of the coils. The raw materials for preparing the inter-group magnet include iron-based alloy II, which comprises the following components by mass percentage: 90.5% Fe, 4% Si, 5% Cr, and 0.5% Zr; the particle size of iron-based alloy II is 5 μm. The raw materials for preparing the bottom electrode magnet include iron-based alloy III, MnO2, and ZnO2. Iron-based alloy III comprises the following components by mass percentage: 95% Fe, 4% Si, 1% Cr, and 0.5% Zr; iron-based alloy III accounts for 94% of the mass of the bottom electrode magnet; MnO2 and ZnO2 are spherical particles with a particle size of 0.2 μm, and the mass ratio of MnO2 to ZnO2 is 1:3.

[0034] Comparative Example 2 A multiphase inductor material includes a magnet assembly and windings. Adjacent coils of the windings are wound in opposite directions, and electrodes are formed by extending the magnet assembly outwards from the windings. The surface of the winding coils includes an oxide layer composed of chromium oxide and aluminum oxide in a 3:1 mass ratio, with a thickness of 0.01 μm. The magnet assembly includes internal and peripheral magnets, inter-assembly magnets, and bottom magnets of the electrodes. The raw material for preparing the internal and peripheral magnets includes FeSi, which comprises 96.5% Fe and 3.5% Si by mass percentage, with a particle size of 3 μm. The raw material for preparing the inter-assembly magnets includes iron-based alloy II, which comprises 95.5% Fe and 4.5% Si by mass percentage, with a particle size of 5 μm. The raw materials for preparing the bottom magnet of the electrode include iron-based alloy III, MnO2 and ZnO2. Iron-based alloy III comprises the following components by mass percentage: 95% Fe, 4% Si, 1% Cr, and 0.5% Zr. Iron-based alloy III accounts for 94% of the mass of the bottom magnet of the electrode. MnO2 and ZnO2 are spherical particles with a particle size of 0.2 μm and a mass ratio of 1:3.

[0035] Comparative Example 3 A multiphase inductor material includes a magnet assembly and windings. Adjacent coils of the windings are wound in opposite directions, and electrodes are formed by extending the magnet assembly outwards from the windings. The surface of the winding coils includes an oxide layer composed of chromium oxide and aluminum oxide in a mass ratio of 3:1, with a thickness of 0.01 μm. The magnet assembly includes internal and peripheral magnets, inter-assembly magnets, and bottom magnets of the electrodes. The raw materials for preparing the internal and peripheral magnets include iron-based alloy I and FeSi. Iron-based alloy I comprises the following components by mass percentage: 92% Fe, 6% Si, 2% Zr, with the balance being iron; the particle size of iron-based alloy I is 15 μm. FeSi comprises the following components by mass percentage: 96.5% Fe, 3.5% Si; the particle size of FeSi is 3 μm, and FeSi accounts for 50% of the mass of the internal and peripheral magnets. The raw materials for preparing the inter-group magnets include iron-based alloy I and FeSi. Iron-based alloy I comprises the following components by mass percentage: 92% Fe, 6% Si, 2% Zr, with the balance being iron; the particle size of iron-based alloy I is 15 μm. FeSi comprises the following components by mass percentage: 96.5% Fe, 3.5% Si; the particle size of FeSi is 3 μm, and FeSi accounts for 50% of the mass of the magnets inside and around the coil. The raw materials for preparing the bottom electrode magnets include iron-based alloy III, MnO2, and ZnO2. Iron-based alloy III comprises the following components by mass percentage: 95% Fe, 4% Si, 1% Cr, 0.5% Zr; iron-based alloy III accounts for 94% of the mass of the bottom electrode magnets; MnO2 and ZnO2 are spherical particles with a particle size of 0.2 μm, and the mass ratio of MnO2 to ZnO2 is 1:3.

[0036] Performance testing The performance of the cured product was evaluated. The product dimensions were 2.5mm (length) x 2mm (width) x 0.55mm (height), and it was a 4-phase product. The inductance and Q value of the sample were tested using an LCR meter under 1A / 10MHz conditions. The loss of the product under 10MHz / 0.5A conditions was tested using a SY-8218. The results are recorded in Table 1.

[0037] Table 1 Performance test results of multiphase inductor materials The materials obtained from the comparative examples and the comparative examples showed significantly higher Q values ​​and significantly lower losses under the same preparation conditions, indicating that the material composition and product structure design have a very important impact on the Q value and losses under high current.

[0038] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. A multiphase inductor material, characterized in that: The device includes a magnet assembly (1) and a winding (2). The adjacent coils of the winding (2) are wound in opposite directions. The winding (2) extends outward from the magnet assembly (1) to form an electrode. The magnet assembly (1) includes magnets (11) inside and around the coil, magnets (12) between the groups, and magnets (13) at the bottom of the electrode. The raw materials for preparing the magnets (11) inside and around the coil include iron-based alloy I and FeSi. The iron-based alloy I includes the following components by mass percentage: 4-6% Si, 0.5-2% Zr, and the balance being iron. The particle size of the iron-based alloy I is 5-15 μm. The surface of the winding (2) coil includes an oxide layer, which includes chromium oxide and aluminum oxide; The thickness of the oxide layer is 0.01-0.1 μm; The FeSi comprises the following components by mass percentage: 3.5-6.5% Si, with the balance being iron, and the particle size of the FeSi is 3-5 μm; The FeSi accounts for 20-50% of the mass of the magnet (11) inside and around the coil.

2. The multiphase inductor material according to claim 1, characterized in that: The raw materials for preparing the inter-group magnet (12) include iron-based alloy II, which comprises the following components in mass percentage: 4-6% Si, 5-10% Cr, 0.5-2% Zr, with the balance being iron; the particle size of the iron-based alloy II is 1-5 μm.

3. The multiphase inductor material according to claim 1, characterized in that: The raw materials for preparing the bottom magnet (13) of the electrode include iron-based alloy III, MnO2 and ZnO2. The iron-based alloy III includes the following components in mass percentage: 4-6% Si, 1-10% Cr, 0.5-2% Zr, and the balance is iron.

4. A multiphase inductor material according to claim 3, characterized in that: The iron-based alloy III accounts for 94-98% of the mass of the bottom magnet (13) of the electrode.

5. A multiphase inductor material according to claim 4, characterized in that: The MnO2 and ZnO2 are spherical particles with a particle size of 0.2-0.5 μm.

6. A multiphase inductor material according to claim 5, characterized in that: The mass ratio of MnO2 to ZnO2 is 1:(0.5-3).

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