TW584873B - Permanent magnet, the magnetic core using it as the magnetic-biased magnet, and the inductance member using the same - Google Patents

Abstract

The magnetic core provided with the superior direct current overlap characteristic and the core-loss characteristic can be obtained by properly arranging the magnet for bias in the gap of the magnetic core. The magnet is the bond magnet made of magnetic powder and the resin, and the volume ratio of the resin contents is above 20%, resistance coefficient is above 0.1 Omega.cm. And the magnetic powder used is the rare-earth magnetic powder with intrinsic permeability above 5 Koe, Curie Point Tc above 300 DEG C and the average grain diameter from 2.0 mum to 50 mum. When it is used as the magnetic core of the inductance member treated by the reflow-soldering, the Sm-Co magnetic powder of resin content above 30%, the intrinsic permeability (when used as magnetic powder) above 10 Koe, the Curie Point Tc above 500 DEG C and the average grain diameter above 2.5 mum is used. When it is used as the small-sized inductance member, the thin sheet magnet of the thickness under 500 mum can be realized.

Description

584873 V. Description of the invention (1:) [Technical field to which the invention belongs] The present invention relates to the magnetic core of the inductive components used in chokes or transformers, that is, the magnetic core (hereinafter referred to as "factory core" 5) Permanent magnets for magnetic use. The present invention relates to an inductive component using a permanent magnet as a magnet for bias magnets and the magnetic core. [Knowledge] In the past, for example, in chokes used in switching power supplies and transformers, AC currents were superimposed on direct currents to be applied. Therefore, the magnetic cores used in these chokes and transformers can obtain ^ firr τπτ magnetic saturation with respect to the DC overlap, and the permeability characteristics (this kind of characteristic is called the factory DC overlap characteristic j or It is simply called the factory overlap characteristic. ") The better product. 0 Although it uses a ferrite core or a powder magnetic core as a high frequency magnetic core, j This material characteristic has always been a ferrite core. The initial magnetic permeability is relatively local and the saturation magnetic number density is small, and the powder magnetic core system has the characteristics of low initial magnetic permeability and large saturated magnetic number density. Therefore, the y powder magnetic core system is often used in bad conditions. Shape. On the other hand, in the case of a ferrite core with a ferrite core, for example, a magnetic gap (magnetic gap) is formed at the support portion under the E-type core, and DC saturation is used to avoid magnetic saturation. 0 However, with the recent miniaturization of electronic devices The request for miniaturization further requires the miniaturization of the magnetic core of the electronic component. The magnetic gap of the magnetic core must also be minimized, which is -3 compared to the DC overlap. Stronger magnetic permeability is still required 584873. 5. Description of the invention (2) Iron core. In contrast to this requirement, it is generally necessary to choose a magnetic core with a high saturation magnetization, that is, a magnetic core that does not cause magnetic saturation under high magnetic fields must be selected. However, the saturation magnetization is an inevitable result under the composition of the material, and there is nothing that can be infinitely improved. As such a solution, proposals have been made in the past that a permanent magnet is arranged on a magnetic gap provided with a magnetic circuit of a magnetic core, and a DC magnetic field is canceled by direct current superimposition, that is, a magnetic bias is provided in the magnetic core. The bias method using this kind of permanent magnet is an excellent method to improve the DC superposition characteristic. However, on the other hand, the core loss of the magnetic core will be significantly increased after the metal sintered magnet is used, or it is in use. The superposition characteristics of the fertilized iron core cannot be stabilized, so it is a product that cannot be practically used. As a solution to these problems, as disclosed in Japanese Patent Laid-Open No. Sho 50-133453, the use of a combined magnet formed by mixing and compressing a rare earth magnet powder with a weaker coercivity and an adhesive is used as a permanent magnet for biasing. The magnet can improve the DC superposition characteristic and the core temperature rise. However, in recent years, the requirements for the improvement of the efficiency of the power change of the power supply can be said to be more stringent. Even for magnetic cores for chokes and transformers, it can only be determined by simply measuring the core temperature and cannot be judged. Pros and cons. For this reason, it is indispensable to judge the measurement result obtained by the core loss measurement device, and the inventors of this case actually conducted a review

-4- 584873 5. Under the result of the description of the invention (3), it is stated that, as shown in Japanese Patent Laid-Open No. 501-13 3 4 5 3, under the range of resistivity, it will cause core loss characteristics. deterioration. In addition, with the recent miniaturization of electronic devices, the miniaturization of inductive components has been increasingly demanded, and the thinning of magnets for bias magnets has been demanded again. In addition, in recent years, surface-mounted coils have been required, and for surface mounting, coils must be installed by reflow soldering. Under such reflow conditions, it is required that the characteristics of the magnetic core of the coil are not deteriorated. In addition, a magnet is also required to have oxidation resistance. [Problems to be Solved by the Invention] The problem of the present invention is to provide a magnetic core with gaps at least i above at least i on the magnetic circuit of a small inductive component, and to provide a magnetic bias that is particularly suitable for both ends of the gap. A magnet serving as a biasing magnet disposed near the gap. [Means for solving the problem] Here, the main object of the present invention is to provide a permanent magnet that can be used as a bias magnet for a magnetic core to provide superior DC superposition characteristics and core loss characteristics of the magnetic core. Another object of the present invention is to provide a permanent magnet for bias magnetism, which does not deteriorate the magnetic characteristics even when exposed to the reflow temperature. A further object of the present invention is to provide superior magnetic characteristics Magnetic core with core loss characteristics. Another object of the present invention is to provide an inductive component.

584873 V. Description of the invention (4) Magnetic core with superior magnetic characteristics and core loss characteristics. [Invention of the invention] According to the present invention, a permanent magnet can be obtained, which is characterized in that the magnet powder is dispersed in the resin and has a specific resistance of 0.1Ω · cm or more. The magnet powder has an inherent coercive force of 5K0e. Above, the Curie point Tc is above 300 ° C, and the powder particle size is below 150 / zm. Here, the magnet powder is such that the average particle diameter of the powder is preferably 2.0 to 50 μm. In the above-mentioned permanent magnet, the resin content is preferably 20% or more in volume ratio. In the permanent magnet, the magnet powder is preferably a rare earth magnet powder. Among the above-mentioned permanent magnets, a molding compression ratio of 20% or more is preferable. Among the aforementioned permanent magnets, it is preferable to use an organic silane coupling agent and a titanium coupling agent in the aforementioned rare earth magnet powder in which the aforementioned magnet is combined. Among the above-mentioned permanent magnets, the anisotropy is optimized by aligning the magnetic field at the time of fabrication. Among the above-mentioned permanent magnets, the above-mentioned magnet powder is preferably coated with a surfactant. In the aforementioned permanent magnet, the average thickness of the center line is preferably 10 # Π1 or less. In addition, in the aforementioned permanent magnet, the entire thickness is 50 to 100000 584873.

V. Description of the invention (5) β m is the best. In the first embodiment of the present invention, the permanent magnet preferably has a specific resistance of 1 Ω • cm or more. In addition, it is made by mold forming or hot stamping. 〇 If other embodiments of the present invention are used, the permanent magnet is made to have an overall thickness of 5 00 // m or less. In this case, it is best to make the system from a mixed coating of resin and magnet powder by a film forming method such as a doctor blade method or a printing method. In addition, the surface roughness (gloss) is preferably at least 25%. Among the permanent magnets described above, the resin is preferably selected from at least one of polypropylene resin, 6-nylon resin, 12-nylon resin, polyamide resin, polyethylene resin, and epoxy resin. . Among the permanent magnets described above, the surface of the magnet is preferably coated with a resin having a heat-resistant temperature of 120 ° C or higher, or a heat-resistant coating. In the permanent magnet described above, the magnet powder is preferably a rare earth powder selected from SmCo NdFeB and SmFeN. According to one embodiment of the aforementioned permanent magnet achieved by the present invention, a permanent magnet having the following characteristics can be obtained, that is, the intrinsic coercive force of the aforementioned magnetic powder is above 10OKe, the Curie point is above 500 ° C, The diameter is 2.5, 5-, 50 / m. Among the permanent magnets achieved in the first embodiment, the magnet powder is preferably a SmCo rare earth magnet powder. In this case, the SmCo rare earth magnet powder is described as Sm (CobalFe0.15 -7- ~ 0.25 C

584873 V. Description of the invention (6) U〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇2. .03) 7.0 ~ 8.5 is taken as {soil. In the permanent magnet achieved in the first embodiment, the resin content is preferably 30% or more in volume ratio. Among the permanent magnets achieved by the first embodiment, the resin is preferably a thermoplastic resin having a softening point of 250 ° C or more. Among the permanent magnets achieved in the first embodiment, the resin is preferably a thermosetting plastic having a carbonization point of 250 ° C or more. In the permanent magnet achieved in the first embodiment, the resin is made of polyamide resin, polyimide resin, epoxy resin, polyphenylene ether sulfide resin, silicone resin, polyester resin, and aromatic resin. It is best to select at least one of the group polyamidamine resin and the liquid crystal polymer. If other embodiments of the present invention are used, a magnetic core having a magnet for bias magnetism can be obtained. In a magnetic core having a magnetic gap with at least one magnetic circuit, at least one magnetic gap is supplied from both ends of the gap. In a magnetic core having a biasing magnet disposed near the magnetic gap, the biasing magnet is a permanent magnet obtained according to the present invention. The magnetic gap of the magnetic core is preferably a gap length of about 50 ~ 1 0000 // m. If the first embodiment is adopted, the magnetic gap has a gap length of more than about 50 vm. In addition, In other embodiments, the magnetic gap is a gap length of about 500 m or less. According to still another embodiment according to the present invention, an inductive component can be obtained. It is characterized in that in a magnetic core having the aforementioned magnet for bias magnet obtained by the present invention, it is possible to obtain 1 turn

584873 Fifth, the description of the invention (7) (turn) or more. [Detailed description of preferred embodiments of the present invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Referring to Fig. 1, the magnetic core according to the first embodiment of the present invention is a body in which two E-type ferrite cores 2 are butted against each other. A gap is left in the joint surface between the supporting portions under the two E-shaped fertilized iron cores 2. The gap is used to insert a permanent magnet 1 for supplying a bias magnetic field. Referring to Fig. 2 again, the magnetic core of Fig. 1 is wound with coil 3 and constitutes an inductance member. Referring to FIG. 3, a magnetic core according to another embodiment of the present invention is disclosed. This magnetic iron core is a ring-shaped iron powder core 5. A gap is provided in the magnetic circuit of the iron powder core, and a permanent magnet 4 for supplying a bias magnetic field is inserted into the gap. In addition, referring to Fig. 4, the figure shows an inductance member formed by applying a winding wire 6 to the magnetic core of Fig. 3. In order to achieve the aforementioned problems, the inventors of the present case reviewed the possibility of supplying permanent magnets for the bias magnetic fields shown by 1 and 4 in Figs. 1 to 4. As a result, it was found that when the specific resistance of the permanent magnet reaches 0.1 Ω · cm or more (preferably 1Q.cm or more, the higher the better.), And the permanent magnet with an intrinsic coercive force iHc of 5KOe or more can be used A superior magnetic superposition characteristic is obtained, and a magnetic core can be formed without deterioration of core loss characteristics. The meaning of this series is that the magnet characteristics necessary to obtain superior DC superimposition characteristics have 584873 compared to the energy product. V. INTRODUCTION OF THE INVENTION (8) The inherent coercive force is better. Therefore, by using a permanent magnet having a high specific resistance and a high intrinsic coercive force as a bias magnet for a magnetic core of an inductive member, it was found that sufficient and high DC superimposition characteristics can be obtained. As mentioned above, permanent magnets with high specific resistance and high intrinsic coercive force are obtained by mixing and forming a rare earth magnet powder with an intrinsic coercive force iHc of 5KOe or more with an adhesive to obtain a rare earth bonded magnet. However, the magnetic powder is not limited to rare earth magnets, and any magnetic powder combination may be used as long as the magnetic powder has a high coercive force with an intrinsic coercive force iHc of 5 KOe or more. The types of the rare earth magnet powder include SmCo, NdFeb, and SmFeN. In addition, after considering thermal demagnetization during use, the magnet powder must have a Curie point Tc of 300 t or more, and an intrinsic coercive force iHc of 5 KOe or more. In addition, when the average maximum particle diameter of the magnet powder is formed above 50 // m, the core loss characteristics will be deteriorated. Therefore, it is best to set the maximum particle diameter of the powder to 50 // m or less, and if the minimum particle diameter is formed, Below 2.0 // m, the magnetization will be significantly reduced by powder oxidation due to pulverization, and a particle size of 2 · 0 // m or more is required. To achieve a specific resistance above 0.1 Ω · cm, it can be achieved by adjusting the adhesive, which means the amount of resin. However, when the amount of resin is less than 20% by volume, it is difficult to form. Difficulties. In addition, by adding coupling materials such as an organic silane coupling agent or a titanium coupling agent to the magnet powder, or coating the surface of the particles with an interfacial active material, the powder in the formed body is dispersed to form a good and improve the characteristics of the permanent magnet. -10- V. Description of the invention (9) A magnetic core with higher characteristics can be obtained. In addition, in order to obtain higher characteristics, it can also be formed in an alignment magnetic field during forming to have anisotropy. In order to improve the oxidation resistance of the magnet, the surface of the permanent magnet may be coated with a heat-resistant resin or a heat-resistant paint. This makes it possible to achieve the same oxidation resistance and high characteristics. In addition, as the adhesive, it is possible to mix and compress the insulating resin with the magnet powder, and any material can be used without affecting the magnet powder. For example, there may be polypropylene resin, 6-nylon resin, 12-nylon resin, polyamide resin, polyethylene resin, and epoxy resin. Next, as described above, the permanent magnets for biasing the magnetic core used in the surface-mounted inductor member by re-soldering will be described. After considering the reflow temperature, in order to avoid thermal demagnetization during reflow, as the magnet powder used, it is necessary to use something with an inherent coercive force iHc of more than lOKOe and a Curie point Tc of more than 500 ° C. Taking such a magnet powder as an example, the rare earth magnet is preferably an SmCo magnet. In addition, the minimum particle size of the magnet powder must be 2 · 5 // m. If it is smaller, it will cause a significant reduction in magnetization due to powder oxidation during powder heat treatment and reflow. In addition, considering the conditions of exposure to the reflow temperature and the reliability of forming, the volume ratio is preferably 30% or more. In terms of resin, in order to prevent carbonization, softening, etc. due to the temperature during reflow, it is to use a thermosetting resin with a carbonization temperature of 250 ° C or higher, or soft -11-584873 V. Description of the invention (1〇) A thermoplastic resin with a temperature of 25 ° C or higher is preferred. Taking such a resin as an example, the resins include polyimide resin, polyimide resin, epoxy resin, polyphenylene ether sulfide resin, silicone resin, polyester resin, aromatic polyimide resin, and liquid crystal polymerization. Thing. In addition, the surface used to cover the permanent magnet can be made of a thermosetting resin (for example, epoxy resin, fluororesin) or a heat-resistant paint with a heat resistance temperature of 27 (TC or higher) to improve heat resistance. In addition, magnets The average particle diameter of the powder is preferably 2.5 ~ 25 // m. Above this range, the surface roughness will be too large to reduce the amount of bias. The average thickness of the center line of the surface of the magnet Ra is 1 0 // m or less When the surface roughness is too rough, a gap will be generated between the soft magnetic magnetic core and the inserted thin plate magnet, reducing the permeability and reducing the magnetic flux density acting on the magnetic core. As a magnetic core for chokes and transfers, Any material with soft magnetic properties is effective. Generally speaking, MnZn-based or NiZn-based ferrous iron, powder magnetic core, silicon steel plate, amorphous, etc. are used. In addition, magnetic properties The shape of the iron core is not particularly limited, and magnetic cores of all shapes, such as toroidal iron cores, EE iron cores, and EI iron cores, can be applied to the permanent magnets of the present invention. A magnetic gap is provided in these iron cores. At least one magnetic circuit, and the permanent magnet is inserted into the gap. Although the gap length is not particularly limited, if the gap length is too narrow, the DC overlapping characteristics will be significantly deteriorated. When the gap length is too wide Because it will reduce the magnetic permeability, it is used to determine the -12-584873 formed naturally. V. Description of the invention (11) The gap is long. The optimal range is 50 ~ 100 00 0 // m. In order to To further reduce the overall size of the magnetic core, it is best to suppress the gap length to 50 0 // m. In this case, in order to insert a permanent magnet for bias magnetism into the gap, of course, to keep the permanent magnet at 500 / / m or less. In the following, embodiments of the present invention will be described. In the description of the following embodiments, it is particularly limited to no special event and must have the following. The size of the magnetic core: E— The core length of the E core is 7.5cm, the effective cross-sectional area is 0.74cm2, and the gap length is G. Permanent magnet: The size and shape of the cross section are set to be the same as the size and shape of the cross section of the magnetic core, and the thickness is T. Manufacture of permanent magnets ： Mix the magnet powder with the resin, and use the mold forming and / or hot stamping, or the film forming method by the doctor blade method, to form a combined magnet of a specified size and shape. When forming, apply an alignment magnetic field as needed. In addition, the doctor blade method is to form the mixture into a slurry suspended in a solvent, and use the doctor blade to form a raw sheet by coating method, and then cut out the specified size. Hot stamping. Measurement of magnet characteristics: Inherent coercive force: Make a sample with a diameter of 10mm and a thickness of 13mm -13-584873 V. Description of the invention (12). Use a DC BH tracking device to measure the intrinsic coercive force (iH0. Specific resistance measurement: The so-called 4-terminal method was performed on the sample. Electrodes were provided on both end surfaces of the sample, and a certain current was passed between the two electrodes. The potential difference between the appropriate two points in the center of the sample was measured with a voltmeter. Magnetization: The permanent magnet is placed in the magnetic gap of the magnetic core, and a magnet is used or a pulse magnet is used to magnetize in the direction of the magnetic circuit. Measurement of the core loss of the magnetic core: An AC current (frequency f, AC magnetic field Ha) was passed through a coil wound around the magnetic core, and the measurement was performed by an AC B-Η tracking device (SY-8232, manufactured by Iwasaki Communication Corporation). Measurement of DC overlap characteristics: The permanent magnet sample is arranged in the gap of the magnetic core of the inductive member, and an alternating current (frequency f) will flow through the coil, and a direct current (superimposed magnetic field Hm opposite to the direction of magnetization of the magnet), The inductance was measured with an LCR instrument, and the magnetic permeability was calculated from the core constant and the number of windings as the DC superimposed characteristic (permeability). Measurement of roughness (gloss): Roughness is the ratio between the intensity of the reflected light on the measured portion and the intensity of the reflected light from the gloss standard plate, which is the amount that reflects the intensity of light when it comes into contact with the surface of the sheet To decide. Measurement of surface magnetic flux (melting): -14- 584873 V. Description of the invention (13) The wire is connected to the retrieval coil of the melting measuring device (for example: TOEI: TDF — 5), which is used to read the change when the sample passes. The amount of melting. Measurement of centerline roughness: The stylus method is used to determine the contour of the sample surface roughness. The centerline is used to stretch the upper and lower areas equally, and the distance from the centerline is calculated for any point. These countless numbers are calculated by averaging, multiplication, square root, and deviation. The deviation from the center is taken as the centerline thickness. Examples will be described below. Example 1 Relationship between specific resistance and core loss Magnet powder: Sm2Fe17N3 Average particle size: 3 μm Inherent coercive force iHc: 10.5KOe Curie point: 470 ° C Adhesive: Epoxy resin amount (vol.%): Adjustment Manufacturing method to obtain specific resistance magnet: mold forming, non-orientation magnetic field magnet: thickness T: 1.5mm shape · area ·· cross section specific resistance of support part under E-shape (Ω · cm): S — 1: 〇 · 〇1 S — 2: 0 · 1 S — 3: 1 S — 4: 10 S — 5: 100

-15- 584873 V. Description of the invention (14) Inherent coercive force: 5K0e or more magnetization: Electromagnet core: EE core (Figures 1 and 2), MnZn ferrite ferromagnetic gap length G: 1.5 mm Core loss measurement: Measured at f = 1 OOKHz, Ha = 0 · 1T (tesla) DC overlap characteristics (permeability from) Measured at f = 100KHz, 1000e ¥ In each sample system, the same magnetic core is used The core loss of each sample after the measurement is as shown in Table 1 below. [Table 1] Sample S— 1 S— 2 S-3 S— 4 S—5 Specific resistance (Ω · cm) No magnet (gap) 0.01 0.1 1 10 100 Core loss (kW / m3) 80 1,500 420 100 90 85 It is obvious from Table 1 that the core loss increases rapidly when the specific resistance does not reach 0.1 Ω • cm, and decreases rapidly above 1 Ω · cm. Therefore, the minimum specific resistance is 0 · 1 Ω · cm, the highest is preferably 1 Ω · cm or more. When no bias magnet is used in the gap, the core loss is 80 (kW / m3), which is lower than that when a bias magnet is used, but the DC superimposition characteristic (permeability) is set to 1 5 After that, it is displayed as quite low. Example 2 Relationship between particle size of magnetic powder and core loss -16- 584873 V. Description of the invention (15) Magnet powder: S m 2C 〇17 Curie point: 810 ° C Volume product: 28MGOe S-1: Maximum particle size Diameter: 200 // m, inherent coercive force 12KOe S-2: maximum particle size: 175 m, inherent coercive force 12KOe S-3: maximum particle size: 150 μm, inherent coercive force 12KOe S — 4: maximum particle size Diameter: 100 // m, inherent coercive force 12KOe S— 5: Maximum particle size: 50 // m, inherent coercive force iHc: Adhesive: epoxy resin resin amount: 10% by weight of each sample Magnet manufacturing method: mold forming , Non-aligned magnetic field magnetization: electromagnet magnet: thickness T: 1.5mm shape • area: 7mmX10mm specific resistance: S — 1 · 1.2 Ω · cm S — 2: 1 · 5 Ω · cm S — 3: 2 · 0Ω · Cm S — 4 ·· 3.0 Ω · cm S — 5: 5 · 0 Ω · cm iHc: iHc: iHc: iHc: 1 IKOe -17 · 584873 5. Description of the invention (16) Inherent coercive force: same as magnet powder Magnetic core: Toroidal core (Figs. 3 and 4): Fe—Si—A1 (Trademark: Setensite) Transmitter core size: outer diameter 28m m, inner diameter 14mm, height 10mm Magnetic gap length G: 0.5 mm Measurement of core loss: Measurement of DC overlap characteristics (permeability) at f = ΙΟΟΚΗζ, Ha = 0.1T Measurement: f = ΙΟΟΚΗζ, Hm = 2000e Measurement results of each sample , As shown in Table 2 below. [Table 2] Sample S — 5 S — 4 S-3 S — 2 S — 1 Specific resistance without magnet-50 β m -100 β m -150 β m -175 β m -200 β m Core loss (kW / m3 ) 100 110 125 150 250 500 It is obvious from Table 2 that the core loss is a rapid increase after the maximum particle size of the powder exceeds 150 μχη. When no bias magnet is used in the gap, the core loss is 100 (kW / m3), which is lower than that when a bias magnet is used, but the DC superimposition characteristic (permeability) is set to 1 5 After that, it is displayed as quite low. Example 3 Relationship between the coercive force of the magnet and the DC superimposition characteristic (permeability) Magnet powder: S -1: Ba fertilizer grain iron -18- 584873

V. Description of the invention (17) Inherent coercive force iHc: 4.0KOe Curie point Tc: 450t: S a 2 · S m 2F e j7N 3

Inherent coercive force iHc: 5.0KOe Curie point Tc: 470 ° C S-3 · S m 2C o 17

Inherent coercive force iHc: lO.OKOe Curie point Tc: 81〇t: Particle size (average): Any sample is 3.0 em Adhesive: Any sample is polypropylene resin (softening point 80 ° C) Resin amount: 50 volume % Shizite manufacturing method: mold forming 'non-aligned magnetic field magnet: thickness T: 1.5mm shape / area: same specific resistance as the cross section of the support part under the iron core: S — 1: 1 04 Ω · cm S — 2: 103 Ω · Cm • S — 3: 1 〇3 Ω · cm intrinsic coercive force: same as magnet powder magnetization: pulse magnetizer magnetic core: EE core (Figures 1 and 2): MnZn ferrite ferromagnetic gap length G: 1 .5 mm DC overlap characteristic (permeability //) measurement: make it change in the range of f = ΙΟΟΚΗζ, Hm = 0 ~ 2000e -19- 584873 5. Description of the invention (18) and use the same magnetic core, The DC overlap characteristics after repeated measurement of 5 times for each sample are shown in Figures 5 to 8. From these drawings, it can be seen that in the core of a ferrite iron core with a coercive force of only 4K0e, the DC superimposition characteristic deteriorates significantly as the number of measurements increases. On the contrary, it can be seen that an iron core with a relatively large coercive force inserted into the core will not change much even after repeated measurement, and shows quite stable characteristics. Based on these results, in order to reduce the coercive force of the ferrous iron magnet, the reverse magnetic field applied to the magnet causes the demagnetization or the reversal of the magnetization, and the deterioration of the DC superposition characteristic can be estimated. In addition, it can be seen that the magnet inserted into the core is a rare-earth bonded magnet having a coercive force of 5K0e or more, and will exhibit superior DC superposition characteristics. Example 4 Relationship between particle diameter of magnetic powder and core loss and surface magnetic flux Stone & iron powder: Sm2Co17 Average particle diameter (/ m): S-1: 1.0 S-2: 2.0 S-3: 25 S — 4: 50 S— 5:55 S — 6: 75 Adhesive: Polyethylene resin resin amount: 40% by volume -20 · 584873 V. Description of the invention (19) Magnet manufacturing method: mold forming 'non-aligned magnetic field magnet: thickness τ: 1.5mm shape and area: specific resistance of the cross section of the support under the E-shape: 〇 · 1 ～ 100Ω · cm (adjust resin amount) Inherent coercive force: all samples are 5K0e or more magnetization: mold forming, no Alignment magnetic cores: EE cores (Figures 1 and 2): MnZn ferrite ferromagnetic gap length G: 0.5mm The measurement results of the surface magnetic flux and core loss of each sample are shown in Table 3 below. [Table 3] Sample S-1 S-2 S — 3 S — 4 S — 5 S — 6 Specific resistance (Vm) No magnet (gap) 1.0 2.0 25 55 75 75 Core loss (kW / m3) 520 650 530 535 555 650 870 Gauss of the surface of the magnet — 130 200 203 205 206 209 After measuring the core loss, take out the permanent magnet 1 for the bias magnet from the core 2 and measure the surface magnetic flux of the magnet with TOEI: TDF-5. Table 3 also shows the surface magnetic fluxes obtained by measuring the dimensions of the gadolinium and the magnet. In Table 3, because the core loss of the average particle diameter 1 · 〇 // m is larger, the surface area of the powder is larger, so the oxidation of the powder is accelerated. When the average particle size is -21-584873 V. Description of the invention (20) 5 5 // m or more, the larger the core loss, the larger the average particle size of the powder will be, which will increase the eddy current loss. In addition, the surface magnetic flux of sample S-1 with a powder particle size of 1.0 / m is reduced to reduce the magnetic portion that helps the powder to be oxidized and magnetized during crushing or drying. Example 5 Relation between resin content and specific resistance and core loss Magnet powder: Sm2Fe17N3 Average particle size: 5.0 // m Inherent coercive force iHc: 5KOe Curie point: 470 ° C Adhesive: 6-Nylon resin resin content (vol.%) ): S— 1:10 S— 2: 15 S— 3 ·· 20 S-4: 32 S-5: 42 Magnet manufacturing method: mold forming, non-aligned magnetic field magnet: thickness T: 1.5mm shape • area: E Specific resistance (Ω · cm) in the cross section of the support under the iron core: refer to Table 4 Inherent coercive force: All samples are 5KOe or more: Electromagnet magnetization

-22- 584873 V. Explanation of the invention (21) Magnetic core: EE core (Figures 1 and 2): MnZn ferrite magnetic gap length G: 1.5 mm Core loss measurement: f = 1 〇 〇 Ο / z / H a = 〇 · 1 T Table 4 shows the core loss measured for each sample. [Table 4] Sample S— 1 S — 2 S-3 S — 4 S — 5 Specific resistance (Ω · cm) No magnet (gap) 0.01 0.1 1.0 10 100 Amount of resin (wt%)-10 15 20 32 42 Iron core Loss (kW / m3) 80 1,500 420 95 90 85 According to the system shown in Table 4, the magnetic core with a specific resistance of 1 or more with a resin content of 20 wt% or more has good core loss characteristics. Example 6 Relation between resin content and DC overlap characteristics Magnet powder: Sm2Fe17N3 Average particle size: 5 // m Inherent coercive force iHc: 5.0KOe Curie point: 470 ° C Adhesive: 1 2-Nylon resin resin content (volume %): S—1: 1〇, S—2: i5 S—3: 20, S—4: 32 Magnet manufacturing method: mold forming, no orientation magnetic field-23-584873 V. Description of the invention (22) Magnet: thickness T: 1.5mm Shape and area: Specific resistance of the cross section of the support under the E-shaped iron core: S — 1: 0.01 Ω · cm S—2: 0.05 Ω · cm S-3: 0.2 Ω · cm S — 4: 15 Ω · Cm inherent coercive force ·· All samples are 5KOe or more Magnetic: Electromagnet Magnetic core: EE core (Figure 1), MnZn ferrite ferromagnetic gap length G: 1 · 5mm Frequency of DC overlap characteristic (permeability) Measurement of characteristics ... Measured the DC overlap characteristics (permeability / 0) at each frequency within the range of f = 1 to 1 GGGGGKHz. Using the same magnetic core, the measured magnetic permeability for each sample // the frequency characteristics are disclosed in Section 1. Figure 9. From Figure 9, it can be seen that the magnetic permeability V of a magnetic core with a resin content of more than 20wt% Frequency characteristics are good up to high frequencies. Example 7 Relationship between the addition of coupling material and DC overlap characteristics Magnet powder: Sm2Fe17N3 Average particle size: 5 // m Inherent coercive force iHc: 5.0KOe Curie point: 470 ° C Coupling material: S-1 · Chin coupling agent, 0.5 wt% -24-584873 V. Description of the invention (23) S-2: Organic silane coupling agent, 0.5wt% S-3: No coupling material adhesive: ring Oxygen resin content: 30% by volume. Magnet manufacturing method: mold forming, non-aligned magnetic field. Magnet: thickness T: 1.5mm. Shape / area: cross-section specific resistance of the support under the E-shaped core: S — 1: 10Ω · cm S — 2: 15Ω · cm S — 3: 2 Ω · cm Inherent coercive force: all samples are 5KOe or more magnetization: electromagnet magnetic core: EE core (Figures 1 and 2), long ferromagnetic gap of MnZn fertilizer particles G: Measurement of frequency characteristics of 1.5mm DC overlap characteristic (permeability): Permeability is measured at each frequency in the range of f = 1 to 1 00000KHZ, and at different temperatures. For samples S-1 to S-3 Measurement of Frequency Characteristics of DC Overlap Characteristics The results are shown in Figures 10 to 12. Figures 10 to 12 show a magnetic core with a bonded magnet added with the titanium coupling agent and the organic silane coupling agent of the present invention. The frequency characteristics of // are stable. The components subjected to each coupling treatment have excellent temperature characteristics, because the addition of a coupling agent makes the resin in the resin -25-584873 V. Invention Disclosure (24) the powder dispersibility is improved, and the volume of the magnet is reduced by the temperature The reason for change. Example 8 Relationship between magnet surface coating and magnetic flux amount Magnet powder: Sm2Fe17N3 Average particle size: 3 // m Inherent coercive force iHc: lO.OKOe Curie point: 470 ° C Adhesive: 1 2-Nylon resin amount: 40 Volume% magnet manufacturing method: mold forming, non-orientation magnetic field magnet: thickness T: 1.5mm shape • area: cross section specific resistance of support part under E-shaped iron core: 100 Ω · cm inherent coercive force: same as magnet powder surface Coating: S — 1: Epoxy resin S-2: No magnetization: Pulse magnetization magnetizing magnetic field ι〇τ Magnetic core: EE core (Figures 1 and 2), long ferromagnetic gap of MnZn fertilizer particles G: 1 · 5ιηιη In addition, the surface coating of the magnet is a solution in which the magnet is immersed in an epoxy resin, then taken out and dried, and then heat-treated at the curing temperature of the resin to harden it. -26- 584873 V. Description of the invention (25) The sample S-1 and the comparison target s-2 are heated in the atmosphere from 120 ° C to 220 ° C each time by 20 ° C, and then carried out separately. After 30 minutes of heat treatment, each heat-treated sample was taken out of the furnace, and the surface magnetic flux (melting amount) and DC overlap characteristics were measured. These results are disclosed in Figures 13 to 15. Fig. 13 is a graph showing changes caused by heat treatment of the surface magnetic flux. From these results, it can be seen that, compared with the case where the magnet not coated was demagnetized at 200 ° C by 49%, compared with the case where the magnet covered with epoxy resin was inserted at 220 ° C, The degree of deterioration of heat treatment also reached a relatively small amount of 28%, showing stable characteristics. Such a system is considered to be capable of suppressing oxidation and suppressing a reduction in melting by coating the surface of the magnet with epoxy resin. In addition, these bonded magnets are inserted into the core, and the results of measuring the DC superimposition characteristics are shown in Figs. 14 and 15. Referring to FIG. 14, the core of the uncoated magnet with sample S-2 is not known as in FIG. 13. With the heat treatment and the reduction of melting, the bias magnetic field generated by the magnet is reduced. And at 220 ° C, the permeability is shifted to the low magnetic field side with a magnetic permeability of about 30 Oe, causing a significant deterioration in characteristics. In contrast, the component covered with the epoxy resin of sample S-1 was transformed to the low magnetic field side only as shown in Fig. 15 only at about 70e. In this way, the DC superimposition characteristics are greatly improved by coating with epoxy resin compared with those without coating resin. -27- 584873 V. Description of the invention (26) Example 9 The relationship between the surface coating of the magnet and the amount of the magnetic flux, except that the magnet powder is set to Sm2Co17, the adhesive is set to polypropylene resin, and the surface coating is set to fluororesin. This is the same as in Example 8. The bonded magnet (sample S-2) coated with a fluororesin-coated bonded magnet (sample S-1) as a comparison target, and uncoated with the resin (sample S-2) was placed in the furnace at about 220 ° C in the air in about 60 minutes. It was taken out, and the fusion | melting measurement and DC superposition characteristic were measured, and heat processing was performed for a total of 5 hours. These results are shown in Figures 16-18. Fig. 16 is a graph showing changes caused by heat treatment of a surface magnetic beam. From these results, it can be known that compared to the case where the magnet of sample S-2 which is not covered is demagnetized by 34% under a treatment of 5 hours, the sample S-1 which is covered with fluororesin is After 5 hours of heat treatment in the core inserted by the magnet, the deterioration degree is also relatively small by 15%, showing stable characteristics. Such a system is considered to be capable of suppressing oxidation and suppressing a reduction in melting by coating the surface of the magnet with a fluorine-containing resin. In addition, the combined magnetic cores of these samples S-1 and S-2 were respectively inserted into the gaps of the same magnetic core, and the results after measuring the DC superimposition characteristics are shown in Fig. 17 and Fig. 18 . Referring to Fig. 17, the magnet core with sample S-2 uncoated with resin is shown in Fig. 16. As a result of the reduction in melting caused by heat treatment, the bias magnet generated by the magnet is reduced. Magnetic field, and after 5 hours, the permeability changes to about 20 Oe and shifts to the low magnetic field side, which causes a significant deterioration in characteristics.

-28- 584873 V. Description of the invention (27) In contrast, the magnet covered with the sample s-1 of the fluororesin is shown in Fig. 18, and is switched to the low magnetic field side only at about 80e. . In this way, the DC superimposition characteristics are greatly improved by coating with a fluororesin as compared with an uncoated resin. From the above, it can be seen that the bonded magnet having a surface covered with a fluororesin is used to suppress oxidation and has excellent characteristics. In addition, the same results can be obtained with other heat-resistant resins or heat-resistant coatings. Example 1 0 Resin type and relationship between resin amount and moldability Magnet powder: Sm2Co17 Average particle diameter: 5.0 // m Inherent coercive force: 15.0KOe Curie point: 8 1 0 ° C Adhesive: S-1: Poly Acrylic resin S-2: 6-Nylon S-3: 1 2-Nylon The magnet powder and each resin as an adhesive are changed so that the resin content is between 15 and 40% by volume. No alignment magnetic field is applied. Hot stamping to form a magnet with a thickness of 0.5mm. As a result, it was found that no matter what resin is used, molding cannot be performed unless the resin content is 20% by volume or more. Example 11 Relationship between magnet powder and DC superposition characteristics Magnet powder: S-1: Sm2Fe17N3 Average particle size: 3.0 // m -29 · 584873 V. Description of the invention (28) Coercive force iHc: lOKOe Curie point Tc: 470 ° C volume: 1 0 0 weight part S-2: Sm2Fe17N3 average particle diameter: 5.0 // m coercive force iHc: 5KOe Curie point Tc: 470 ° C volume: 1 0 0 weight part S-3: Ba fertilizer grain Average particle size of iron: 1.0 // m Coercive force iHc: 4KOe Curie point Tc: 450 ° C Quantity: 100 parts by weight Adhesive: S — 1: Polypropylene resin content: 40 parts by volume S — 2: 1 2 — Nylon Resin content: 40 vol. S-3: 1 2 — Nylon resin volume: 40 vol. Magnet manufacturing method: mold forming, non-oriented magnetic field magnet: thickness T: 0.5mm shape • area: cross section of support part under E-shaped iron core Specific resistance: S — 1: 10 Ω · cm -30- 584873 V. Description of the invention (29) S — 2: 5 Ω · cm S — 3: 1 04 Ω · cm or more Inherent coercive force: sl, S — 2: 5K0e or more S—3: 4K0e or less Magnetism: Pulse magnetizer 4T Magnetic field Magnetic core: EE core (Figure 1): MnZn ferrite Gap length G: 0.5mm DC overlap characteristic (permeability): The DC overlap characteristic is measured by changing it in the range of f = 10OKHz and Hm = 0 to 2000e. It is determined by each sample S-1 to S-3 The same magnetic core was used for 5 measurements, and the results are shown in Figures 19 to 21. For comparison, the DC superimposition characteristics of the magnetic gap without the bias magnet is inserted. The results are shown in Fig. 22. As can be seen from Fig. 21, only the coercive force is inserted into the gap. 4KOe's ferrous iron magnets are dispersed in the magnetic core of 1-Nylon resin sample S-3. As the number of measurements increases, the DC superimposition characteristics deteriorate considerably. On the contrary, in the case of using Sm2Fe17N3 magnet powder with a coercive force of 10KOe and 5KOe and magnets using polypropylene or 12-nylon resin samples S-1 and S-2, it can be seen as shown in Fig. 19 and Fig. As shown in Figure 20, even after repeated measurement, there will not be much change, and it shows quite stable characteristics. -31-584873 V. Description of the invention (30) Based on these results, in order to reduce the coercive force of the ferrous iron magnet, to reduce the magnetization by applying a reverse magnetic field to the magnet, or to cause the reversal of magnetization, It is presumed that a component with degraded DC superposition characteristics. In addition, it can be seen that the permanent magnets for bias magnetism inserted into the magnetic gap are permanent magnets having a coercive force of 5K0e or more, and will exhibit superior DC superimposition characteristics. Example 12 Relationship between particle diameter of magnetic powder and core loss Magnet powder: Sm2Co17 Curie point: 810 ° C s — 1: Average particle diameter: 1 · 〇 " m, coercive force: 5K0e S-2: average particle Diameter: 2.0 // m, coercive force: 8K0e S — 3: average particle size: 25 / zm, coercive force: lOKOe S — 4: average particle size: 50 // m, coercive force: llKOe S— 5: average particle size Diameter: 55 // m, Coercive force: llKOe Adhesive: 6 — Nylon resin resin amount: 30% by volume Magnet manufacturing method: Mold forming, non-aligned magnetic field Magnet: Thickness T: 0.5mm Shape • Area: Supported under an E-shaped iron core Sectional specific resistance: S — 1: 0.05 Ω · cm S — 2: 2.5 Ω · cm S-3: 1.5 Ω · cm S-4: 1.0 Ω · cm S — 5: 0.5 Ω · cm

-32- 584873

V. Description of the invention (31) Inherent coercive force: same as magnet powder

Magnetic field with 4T magnetic core, EE core (Figure 1): MnZn ferrite ferromagnetic gap length G: 0 · 5mm Core loss: f = 3 OOKHz, jja = 〇 · 1 τ measured core loss results, As shown in Table 5. [Table 5] Sample S— 1 S —2 S—3 S — 4 S — 5 Particle size (β m) 1.0 2.0 25 50 55 Core loss (kW / m3) 690 540 550 565 820 The average particle diameter of the powder used for the permanent magnets for bias magnets is 2.0 ~ 5 0 // m, which has excellent core loss characteristics. Example 13 Relationship between roughness (gloss) and melting (surface magnetic flux) Magnet powder: Sm2Fe17N3 Average particle size: 3 // m Coercive force iHc: lOKOe Curie point: 470 ° C Adhesive: 1 2-Nylon resin Resin content: 35% by volume Magnet manufacturing method: Mould forming, non-aligned magnetic field magnetization: Pulse magnetizer -33-584873 V. Description of the invention (32) Magnetizing magnetic field 4T Magnet: Size: lcm × lcm, thickness: 0.4mm shape • Area: Specific resistance of the cross section of the support under the E-shaped core: 3 Ω · cm Inherent coercive force: lOKOe The surface magnetic flux (melt) and gloss (roughness) of the magnet were measured. The results are shown in Table 6. Roughness (%) 12 17 23 26 33 38 Melt (Gauss) 37 49 68 100 102 102 According to the results in Table 6, the thin-plate magnets with a roughness of 25% or more have excellent magnet characteristics. This is because the total amount of the thin-plate magnets produced is more than 25%, so the filling rate of the thin-plate magnets is more than 90%. Here, the so-called filling rate is the density obtained by dividing the weight of the formed body by the volume to obtain the density, and dividing the density by the true density of the magnet alloy represents the volume ratio of the alloy in the formed body. In addition, in this embodiment, although the test results are disclosed for members using 12-nylon resin, other than that, for example, even polyethylene, polypropylene, and 6-nylon resin can obtain the same results. . Example 14 Relationship between roughness and melting and compression rate Magnet powder: Sm2Fe17N3 Average particle size: 5 // m Coercive force iHc: 5KOe -34- 584873 V. Description of the invention (33) Curie point: 470 ° C Adhesive : Polyamine resin resin amount: 40% by volume Magnet manufacturing method: Squeegee method, no alignment magnetic field, hot stamping magnetization after drying: pulse magnetizer

4T magnet with magnetic field: size: lcmXlcm, thickness: 500 / zm shape • area: specific resistance of the cross section of the support under the E-shaped core: 50 Ω · cm inherent coercive force: the same as the magnet powder. Samples with different compression ratios ranging from 0 to 22 (%). The compression ratio is defined by hot stamping as follows: the compression ratio = 1 (thickness after hot stamping / thickness before hot stamping). The gloss and surface magnetic flux were measured for each sample. The results are shown in Table 7. Roughness (%) 8 17 22 25 29 40 Melt (Gauss) 33 38 49 99 100 101 Compression ratio (%) 0 5 13 20 21 22 [Table 7] _____ From the results of Table 7, the roughness reaches 25% or more. Good magnet characteristics can be obtained. This reason is also because the roughness reaches 25% or more, and the charge rate of the thin-plate magnetic core is formed to 90% or more. In addition, it can be seen from the viewpoint of the compression ratio that when the compression ratio reaches 20% or more, good magnet characteristics can be obtained. This reason -35- 584873 V. The description of the invention (34) is also the reason that the compression rate of the thin plate magnetic core is more than 90%. In this example, although the experimental results of the above composition and blending ratio are disclosed by using a polyethylene resin, even the blending ratio other than this and other (such as polypropylene, nylon, etc.) resins also The same result can be obtained. Example 1 5 Relationship between adding surfactant and core loss Magnet powder: Sm2Fe17N3 Average particle size: 2.5 // m Coercive force iHc: 12KOe Curie point: 470 ° C Additive: Interface active material: S-1: Sodium phosphate 0.3 wt% S — 2: Carboxymethylcellulose sodium salt 0.3 wt% S-3: Sodium cholate 0.3 wt% Adhesive: Polypropylene resin content (vol%): 35vol% Magnet manufacturing method: mold forming , Non-aligned magnetic field magnet: Thickness: 0.5mm Shape • Area: Specific resistance of the cross section of the support under the E-shaped iron core: S-1, S-2, S-3 are all 10Ω · cm Inherent coercive force: with magnet powder Same magnetization: pulse magnetization

-36- 584873 V. Description of the invention (35) 4T magnetic field magnetic core: EE core (Fig. 1): MnZn ferrite core ferromagnetic gap length G ·· 0 · 5 mm Core loss: f = 300KHz, Ha = The 0.1T measurement was used as a comparative sample (S-4). The average particle size of the magnet powder was 5.0 / zm, and no interface active material was used to produce a different permanent magnet sample. Similarly, the core loss was measured. . The measured core loss is shown in Table 8. [Table 8] Sample name Core loss (kW / m3) S — 1 Sodium phosphate additive 480 S — 2 Carboxymethyl cellulose sodium salt additive 500 S — 3 Sodium silicate 495 S — 4 No additive 590

Table 8 shows that the surfactant added has good core loss characteristics. This is to prevent aggregation of primary particles by adding a surfactant, and to suppress eddy current loss. In this embodiment, the results are shown by adding phosphate. However, even if a surfactant other than this is added, the same results can be obtained with good core loss characteristics. Example 1 6 Relationship between specific resistance and core loss Magnet powder: Sm2Fe17N3 Average particle size: 5 / zm Inherent coercive force iHc: 5.0KOe Curie point: 470 ° C -37- 584873 V. Description of the invention (36) Adhesive: Polypropylene resin content: Adjustment magnet Manufacturing method: Mold forming, non-aligned magnetic field Magnet: Thickness: 0.5mm Shape • Area: Specific resistance (Ω · cm) of support section under E-shape: S— 1: 0 · 05 S — 2 _ · 0 · 1 S-3: 0.2 S-4: 0.5 S — 5 ·· 1 · 0 Inherent coercive force: 5.0KOe Magnetizing: Pulse magnetizing magnetic field 4 T Magnetic core: EE core (Figure 1): Ferromagnetic gap length of MnZn fertilizer particles G: 0.5mm Core loss measurement: The core loss after measurement is measured at f = 300KHz, Ha = 0.1T, as shown in Table 9. [Table 9] Sample S— 1 S — 2 S-3 S — 4 S — 5 Specific resistance (Ω · cm) 0.05 0.1 0.2 0.5 1.0 Core loss (kW / m3) 1180 545 540 530 525 The core loss is good for magnetic cores with a specific resistance of 〇 · 丨 Ω · cm or more. This is because the eddy current loss can be controlled by increasing the specific electricity of the thin-plate magnet. 38-584873 V. Invention Description (37). Next, an embodiment in which an inductive element processed by solder reflow is used and a magnet for bias magnetization is used will be described. Example 1 7 Relationship between the type of magnet powder and DC superimposition characteristics Magnet powder: Nd2Fe14B Average particle size: 3 ~ 3 · 5 // m Coercive force iHc: 9K0e Curie temperature Tc: 310 ° C Magnet powder: Sm2Fe17N3 Average Particle size: 3 ~ 3.5 // m Coercive force iHc: 8.8KOe Curie temperature Tc: 470 ° C Magnet powder: Sm2Co17 Average particle size: 3 ~ 3.5 // m Coercive force iHc: 17K0e Curie temperature Tc: 810 ° C Adhesive: Polyamide resin (softening point: 300 ° C) Resin content: 50% by volume Magnet manufacturing method: Mold forming, non-orientation magnetic field Magnet: Thickness: 10.5mm Shape • Area: Cross section ratio of support under the E-shaped core Resistance (Ω · cm): 10 ~ 30 Inherent coercive force: S— 1: 9KOe

-39- 584873 V. Description of the invention (38) S — 2: 8.8KOe S- 3: 17K0e magnetization: pulse magnetization

Magnetic field 4T Magnetic core: EE core (Figure 1): MηZη Ferrite magnetic gap length G: 1 · 5mm DC overlap characteristic (permeability): change it in the range of f = ΙΟΟΚΗζ, Ha = 0 ~ 2000e The measurement of the DC overlap characteristics was performed before and after the treatment in a high-temperature tank at a temperature of 270 ° C in a reflow furnace, followed by cooling to normal temperature for 1 hour and leaving it for 2 hours. In addition, as a comparative example, no sample was inserted into the magnetic gap, and the sample was produced in the same manner as described above, and the DC superposition characteristic was measured. The results are shown in FIG. 23. As can be seen from Fig. 23, before reflow, the DC overlap characteristics of all the magnet gap samples without any samples inserted are relatively extended. However, on the other hand, after reflow, it can be known that the DC superimposition characteristics in a sample with a low Tc Nd2Fe14B bonded magnet and a Sm2Fe17N3 bonded magnet will deteriorate, and those who have not inserted the sample will lose their advantages. In addition, it can be seen from the aspect of the Sm2Co17 bonded magnet with a high Tc that it maintains its advantages even after re-soldering. Example 18 Relationship between the type of resin and magnet characteristics Magnet powder ·· Sm2Co17 Average particle size: 3 ~ 3.5 // m -40- 584873 V. Description of the invention (39) Curie point Tc: 900 ° C Coercive force ( iHc): 17K0e Adhesive: S-1: Polyethylene resin (softening point · 160t) S — 2: Polyamide resin (softening point: 300 ° C) S — 3: Epoxy resin (hardening point: 100 ° C ) Resin content: 50% by volume Magnet manufacturing method: Mold forming, non-aligned magnetic field Magnet: Thickness T: 1.5mm Shape • Area: Specific resistance (Ω · cm) of support section under E-shaped core: 10 ~ 30 Magnetic force (iHc): S— 1, S— 2, S-3 (any of them): 1.7KOe Magnetization: pulse magnetization magnetization magnetic field 4T Magnetic core: EE core (Figure 1): MnZn fertilizer particles Ferromagnetic gap length G: 1 · 5mm DC overlap characteristics (permeability) · DC overlap characteristics are measured in the range of f = 10OKHz, Hm = 0 ~ 2000e, based on the temperature of 270 ° C in the reflow furnace In a high-temperature tank, it was measured before and after it was maintained for 1 hour, cooled to normal temperature, and left and treated for 2 hours. The results are shown in Figure 24. Figure 24 shows that after reflow, epoxy resin with a softening point of 300 ° C and epoxy resin with a curing temperature of 100 ° C in a thermosetting resin • 41 · 584873 V. Description of the invention (4〇) In the bonded magnet with grease, the DC overlap characteristics are approximately the same before and after reflow. On the other hand, in a bonded magnet using a polyethylene resin having a softening point of 160 ° C, it is known that those who have softened with the resin and cannot insert the sample in the gap have the same DC superposition characteristics. Example 1 9 Relationship between the type of magnet (inherent coercive force) and DC superimposition characteristics Magnet powder: S-1: Nd2Fe14B Average particle size: 3 ~ 3.5 // m Curie point Tc: 310 ° C coercive force (iHc ): 5.0KOe S — 2: Sm2Fe17N3 average particle size · 3 ~ 3 · 5 // m Curie point Tc: 470 ° C coercive force (iHc): 8.0KOe S — 3 · S m 2 C 〇J 7 average Particle size: 3 ~ 3 · 5 β m Curie point Tc: 810 ° C Coercive force (iHc): 17.0KOe Adhesive: Polyamide resin (softening point: 300 ° C) Resin amount: 50% by volume Magnet manufacturing method: Mold forming, non-orientation magnetic field Magnetic 鐡: thickness T · 1.5mm shape · area: cross section of support part under E-shaped iron core

-42- 584873 V. Description of the invention (41) Specific resistance (Ω · cm): 10 ~ 30 Inherent coercive force (iHc): same as magnet powder magnetization: pulse magnetization magnetizing magnetic field 4 T magnetic core: EE core (Figure 1): Ferromagnetic gap length of MnZn fertilizer grains G: 1 · 5mm Straight overlap characteristics (permeability): Measured in a range of f = 100 kHz, Hm = 0 to 1 50 (Oe) The DC superimposition characteristics were measured after cooling for 1 hour in a high-temperature tank with a temperature of 270 ° C in a reflow furnace, and then cooling to room temperature, and then leaving it to stand for 2 hours. In addition, as a comparative example, no sample was inserted into the magnetic gap, and it was produced in the same manner as described above, and the DC superposition characteristic was measured. The results are shown in Figure 25. It can be seen from FIG. 25 that the sample for disposing the permanent magnet for the magnetic bias is inserted into the magnetic gap. Regardless of the sample, it can be seen that the sample without the permanent magnet for the magnetic bias is used before reflow. Ascender. On the other hand, after reflow, it can be seen that the DC superimposition characteristics of the samples using Ba ferrite sintered magnets and Sm2Fe17N3 bonded magnets, which are permanent magnets for bias magnets and low in He, are used. This is because these permanent magnets are vulnerable to thermal demagnetization because their inherent coercive force iHc is low. In addition, it is also known that the Sm2C〇17 bonded magnet with a high iHc can maintain its superiority in terms of DC overlap characteristics after reflow compared with others.

-43-

• Description of the invention (42) Examples? π 1 ″ 20 magnet = relationship Magnet powder: The type of magnet (Curie point)

S— 1: Nd2Fe14B Average particle size: 3 ~ 3 · 5 // m Curie point Tc: 310 ° C Coercive force (iHc) ·· 9K0e S — 2 · Sm2Fe, 7N3 Average particle size · 3 ~ 3 · 5 // m Curie point Tc: 470 ° C coercive force (iHc): 8.8KOe S — 3 · Sm2Co! 7 Average particle size: 3 ~ 3.5 // m Curie point Tc: 810 ° C coercive force (iHc): 17K0e ® Adhesive: Polyamide resin (softening point: 30 (TC) resin amount: 50% by volume) magnet manufacturing method: mold forming, no alignment magnetic field

Shape and area: Cross section of the support part under the E-shaped core. Specific resistance (Ω · cm): 1 0 ~ 3 0 (all samples are). Inherent coercive force (iHc): same as magnet powder.

Magnetic field 4T -44- V. Explanation of the invention (43) Magnetic core: EE core (Fig. 1): MnZn ferrite ferromagnetic gap length G: 1 · 5mm DC overlap characteristic (permeability): make f = ΙΟΟΚΗζ, Hm = 0 ~ 150〇e to measure the DC overlap characteristics, in a reflow furnace temperature conditions of 270 ° C in a high-temperature bath 'after cooling for 1 hour to normal temperature, 2 hours of standing treatment Measured before and after. In addition, as a comparative example, no sample was inserted into the magnetic gap, and it was produced in the same manner as described above, and the DC superposition characteristic was measured. The results are shown in Figs. It can be seen from FIG. 26 that the sample in which the permanent magnet for the magnetic bias is inserted into the magnetic gap. Regardless of the sample, it is known that the sample without the permanent magnet for the magnetic bias is used before reflow, and the DC overlap characteristic is Ascender. On the other hand, after reflow, it can be seen that when using Nd2Fe14B bonded magnets and Sm2Fe17N3 bonded magnets, which are permanent magnets for magnetic bias and have a low Curie point Tc, the DC overlap characteristics will deteriorate, Loss of superiority with no sample inserted. In addition, it is also known that the Sm2C〇17 bonded magnet with a high Curie point Tc can maintain its advantages after reflow. Example 2 1 Relation between particle size of magnetic powder and core loss Magnet powder: Sm2Co17 Average particle size (// m): S-1: 1 5 0 S— 2: 100 S — 3: 50 -45- 584873 5 Explanation of the invention (44) S — 4: 10 S-5: 5.6 S — 6: 3.3 S— 7: 2.4 S — 8: 1.8 Adhesive: epoxy resin amount: 50% by volume Magnet manufacturing method: mold forming, no Orientation magnetic field magnet: Thickness: 0.5mm Shape / area: Specific resistance of the cross section of the support under the E-shape: 0.01 ~ 100 Ω · cm (Adjust the amount of resin) Inherent coercive force: Table 1 〇 Magnetization: Pulse magnetization Magnetic field 4T Magnetic core: EE core (Figures 1 and 2): MnZn ferrite ferrite magnetic gap length G ·· 0.5mm The same magnetic core is used for each sample, and the core loss is f = 300KHZ, Hm = Measured at 1 000 G at room temperature. The measurement results are shown in Table 11.

-46- 584873 V. Description of the invention (45) Sample Sl S — 2 S — 3 S — 4 S — 5 S — 6 S-7 S — 8 Average particle size 150 β m 100 β m 50 // m 10 // m 5.6 // m 3.3 β m 2.5 β m L8 β m Br (kG) 3.5 3.4 3.3 3.4 3.0 2.8 2.4 2.2 He (KOe) 25.6 24.5 23.2 21.5 19.3 16.4 12.5 9.5 [Table 11] Sample S-1 S — 2 S — 3 S — 4 S — 5 S — 6 S — 7 S — 8 Powder size without magnet 150 μ m 100 β m 50 // m 10 // m 5.6 β m 3.3 β m 2Αβ m 1.8 β m Core loss (kW / m3) 520 1280 760 570 560 555 550 520 520 520 Next, the DC superposition characteristic is based on the high temperature bath of the reflow furnace temperature of 270 ° C. After maintaining for 1 hour, it is cooled to room temperature and left for 2 hours. Measured before and after treatment. In addition, as a comparative example, no sample was inserted into the magnetic gap, and it was produced in the same manner as described above, and the DC superposition characteristic was measured. The results are shown in Figure 27. As shown in Table 11, it can be seen that when the maximum particle diameter (powder particle size) of the magnet powder exceeds 50 // m, the core loss will increase rapidly. In addition, it can be seen from FIG. 27 after re-soldering that when the powder particle size is 2.5 // m or less, the DC superposition characteristic is deteriorated. From this, it can be seen that a combination magnet having an average particle diameter of the magnet powder of 2.5 to 50 // m is used as a permanent magnet for bias magnetism, and an excellent DC overlap characteristic can be obtained even after reflow , And a magnetic core that does not cause deterioration of core loss can be obtained. -47- 584873 V. Description of the invention (46) Example 22 Relationship between specific resistance and core loss Magnet powder: Sm2Co17 Average particle size: 3 // m Inherent coercive force iHc: 17K0e Curie point Tc: 810 ° C Adhesive: Epoxy resin content (vol.%): Adjusted to obtain specific resistance magnets Manufacturing method: mold forming, non-aligned magnetic field magnet: thickness: 1.5mm shape • area: cross section specific resistance (Ω · cm) ): S— 1: 0 · 01 S- 2: 0.1 S- 3: 1 S— 4: 10 S — 5 ·· 100 Inherent coercive force: 5KOe or more magnetization: Pulse magnetizer magnetizing magnetic field 4T magnetic core: EE core (Figures 1 and 2): MnZn ferrite ferromagnetic gap length G: 1.5mm Core loss: measured at f = 300KHz, Ha = 1000G For each sample, the core loss measured using the same magnetic core is as follows: Table 12 shows. • 48-584873 V. Description of the invention (47) [Table 12] Sample S— 1 S — 2 S — 3 S — 4 S — 5 Specific resistance (Ω · cm) No magnet (gap) 0.01 0.1 1 10 100 Core loss (kW / m3) 520 2100 1530 590 560 530 As can be seen from Table 12, when the specific resistance of the combined magnet is less than 1Ω · cm, the core loss will rapidly deteriorate. From the above results, it can be seen that a permanent magnet for direct current bias has a specific resistance of 1 Ω · cm or more, and a magnetic core having excellent DC superposition characteristics with less deterioration in core loss characteristics can be obtained. Example 23 Relationship between the type of magnet (inherent coercive force) and DC superimposition characteristics Magnet powder: S-1: Sm (COmFemCiXo.KZr .. ^) 0.74 Average particle size: 5.0 // m Curie point Tc: 820 ° C Coercive force (iHc) ·· 8KOe S— 2 · Sm (Co0 742Fe0 20Cu0 055Zr0 03) 0 75 Average particle size: 5.0 // m Curie point Tc: 810 ° C Coercive force (iHc): 20KOe Adhesive: ring Oxygen resin (hardening point: approx. 150%) Resin content: 50% by volume Magnet manufacturing method: mold forming, non-oriented magnetic field Magnet: thickness T: 0.5mm Shape / area: cross section of support part under E-shaped core -49 -584873 V. Description of the invention (48) Specific resistance (Ω · cm): Any sample is 1 Ω · cin or above. Inherent coercive force (iHc): Same as magnet powder. Magnetization: Pulse magnetizer. Magnetic field. 4T magnetic core. : EE core (Figure 1): MnZn ferrite ferromagnetic gap length G ·· 0.5mm DC overlap characteristic (permeability): Measure the DC overlap characteristic by changing it in a range of f = ΙΟΟΚΗζ, Hm = 0 to 150Oe, It is maintained at a temperature of 270 ° C in a reflow furnace. After cooling to room temperature for 2 hours before and after the measuring process placed. In addition, as a comparative example, no sample was inserted into the magnetic gap, and it was produced in the same manner as described above, and the DC superposition characteristic was measured. The results are shown in Figure 28. From Figure 28, it can be seen that when the combined magnet using Sm2Co 1 7 magnet powder with more coercive force is used as a permanent magnet for bias magnetism, superior DC overlap characteristics can be obtained even after reflow. . The combination of magnets with Sm (Coba? 6.15_.25 匸 11.5-u3) 7.0-8.5 composed of the above-mentioned magnet powder is used to obtain good DC superposition characteristics. Example 24 Relationship between the type of resin and DC superimposed characteristics Magnet powder: Sm2Co17 Average particle size: 3.0 ~ 3.5 // m -50- 584873 V. Description of the invention (49) Coercive force (iHc): lOKOe Curie point Tc : 81CTC Adhesive: S — 1: Polyethylene resin (softening point: 160 ° C) Resin content: 50% by volume S-2: Polyurethane resin (softening point: 300 ° C) Resin content: 50% by volume S- 3: Epoxy resin (softening point: 100 ° C) Resin amount: 50% by volume Magnet manufacturing method: mold forming, non-orientation magnetic field stone & iron: thickness: 0.5mm shape • area: under E-shaped iron core Supporting section specific resistance: 10 ~ 30 Ω · cm or more Inherent coercive force: same as magnet powder magnetization: pulse magnetizer magnetizing magnetic field 4T magnetic core: EE core (picture 1): MnZn ferrite magnetic gap Length G ·· 0 · 5 mm DC overlap characteristics (permeability): The measurement of DC overlap characteristics in the range of f = lOOKHz, Hm = 0 ~ 150Oe, is suitable for the same as using each resin S-1 to S A magnetic core was used for the 3 magnet samples. In a high temperature bath with a reflow furnace temperature of 270 ° C, maintain it for 1 hour, cool to room temperature, and measure the DC overlap characteristics before and after 2 hours of standing treatment. -51-584873 5. Description of the invention (50). In addition, as a comparative example, no sample was inserted into the magnetic gap, and it was produced in the same manner as described above, and the DC superposition characteristic was measured. The results are shown in Figure 29. It is revealed from FIG. 29 that after reflow, the bonded magnets using a softening point of 30 ° C (polyamide resin and a hardening resin with a curing temperature of 100 t) have a DC superposition characteristic relative to the DC superposition characteristics. Before the re-soldering, it is almost the same. In the bonded magnet using a polyethylene resin with a softening point of 1 60 ° C, the resin has been softened, and it has the same DC overlap characteristics as the magnetic material without a permanent magnet for DC bias. Example 25 Relationship between the coupling material and core loss Magnet powder: Sm2Co17 Average particle size: 3.0 ~ 3.5 // m Coercive force (iHc): 17KOe Curie point Tc: 810 ° C Coupling material: S-1: Organic Silane coupling agent, 0.5wt% S-2: No coupling material Adhesive: Epoxy resin amount (vol%): 50vol% Magnet manufacturing method: Mold forming, non-aligned magnetic field magnet: Thickness T: 1.5mm Shape and area : Specific resistance of the cross section of the support under the E-shaped core (Ω · cm): S — 1:10, S-2: 100 Inherent coercive force: 17KOe -52- 584873 V. Description of the invention (51) Magnetization: pulsed Magnetic machine

Magnetic field 4T Magnetic core: EE core (Figures 1 and 2), MnZn ferrite magnetic gap length G: 1.5 mm Core loss: measured at f = 300KHz, Hm = 1000G For each sample to use the same magnetic core The measured core loss is not shown in Table 13 below. [Table 13] Coupling treatment Coupling treatment Yes / No Core loss 525 550 (kW / m3) As can be seen from Table 13, the loss is reduced by adding a coupling agent. This can be considered as the one in which the insulation between the powders is made good by the coupling treatment. In addition, even in the DC overlap characteristic after reflow, a good result can be obtained for the bonded magnet after the coupling process. This can be considered to prevent oxidation during reflow by coupling treatment. As explained above, good results can be obtained by coupling the powders. Example 26 Relation between anisotropic magnets and DC superposition characteristics Magnet powder · Sm2Co17 Average particle size: 3.0 · 3.5 / m Curie point Tc: 810 ° C Inherent coercive force (iHc): 17KOe -53- 584873 V. Description of the invention (52) Adhesive: epoxy resin (curing point is about 25 (TC) resin amount (vol%): 50vol% magnet manufacturing method: mold forming, S-1: alignment magnetic field in thickness direction: 2T S — 2: Non-aligned magnetic field magnet: Thickness: 1.5mm Shape • Area: Specific resistance (Ω · cm) ·· 1 Ω · cm Inherent coercive force (iHc): 17KOe Magnetization: Pulse Magnet magnetic field 2T Magnetic core: EE core (Fig. 1), MnZn ferrite magnetic gap length G: 1.5 mm Core loss: Measured in the range of f = ΙΟΟΚΗζ, Hm = 0 ~ 150 (Oe) The DC superposition characteristic is used when the magnetic field aligned object and each of the samples S-1 and S-2 that are not subjected to the same magnetic core are used. It is maintained in a high-temperature tank with a temperature of 270 ° C in the reflow furnace. Cool to room temperature after 1 hour, and measure for 2 hours DC overlap characteristics. The results are shown in Fig. 30. It can be determined from Fig. 30 that the anisotropic magnet with magnetic field alignment can obtain a good DC before and after reflow compared with a magnet without magnetic field alignment Example 27: Relation between the magnetic field and DC overlap characteristics -54- 584873 V. Description of the invention (53) Magnet powder: Sm2Co17 Average particle size: 3 ~ 3.5 # m Curie point Tc: 810 ° C Inherent Coercive force (iHc): 17K0e Adhesive: Epoxy resin (curing point about 250 ° C) Resin content (vol.%): 50 vol.% Magnet manufacturing method: mold forming, non-aligned magnetic field Magnet: thickness · 1.5mm shape • area: Cross section specific resistance of the support under the E-shaped core (Ω · cm) ·· 1 Ω · cm Inherent coercive force: 17KOe Magnetization: S—1: 1T (electromagnet) S— 2: 2T (electromagnet) S- 3: 2.5T (Electromagnet) S-4: 3T (Pulse magnetization) S- 5: 3.5T (Pulse magnetization) Magnetic core: EE core (Fig. 1), long ferromagnetic gap of MηZη fertilizer grain G: 1 5mm DC overlap characteristics (permeability): f = ΙΟΟΚΗζ, Hm = 0 ~ 150 (〇e) The DC superimposition characteristics are measured around each sample S-1 to S-5 with respect to the same magnetic core, and they are cooled to room temperature for 1 hour in a high-temperature tank with a reflow furnace temperature of 270 ° C. -55-584873 before and after 2 hours of standing treatment V. Description of the invention (54) Measure the DC overlap characteristic. The results are shown in Figure 31. As can be seen from Figure 31, when the magnetic field reaches 2.5 T (Tesla) or more, good DC overlap characteristics can be obtained before and after reflow. Example 2 8 Relationship between magnet surface coating, magnetic flux and DC superposition characteristics Magnet powder: Sm2Co17 Average particle size: 3 // m Inherent coercive force iHc: 17K0e Curie point Tc: 810 ° C Adhesive: epoxy resin Amount: 40% by volume Magnet manufacturing method: Mold forming, non-orientation magnetic field Magnet: Thickness T: 1.5mm Shape / Area: Section specific resistance of support section under E-shaped iron core: 1 Ω · cm Inherent coercive force: 17KOe Surface coating: S-1: Epoxy resin S- 2: No magnetization: Pulse magnetization magnetizing magnetic field 10 〇 Magnetic core: EE core (Figures 1 and 2): MnZn ferrite ferromagnetic gap length G: 1.5mm DC Overlap characteristics (permeability): measured by f = ΙΟΟΚΗζ, Hm = 0 -56- V. Description of the invention (55) ~ 2 5 0 0 e In addition, 'the surface of the magnet is covered by immersion in the ring The magnet in the oxygen resin solution is taken out, and after drying, it is heat-treated at the curing temperature of the resin to harden it. Sample S — 1 and s — 2 of the comparison target were heated in the atmosphere from 120 ° C to 270t at a temperature of 40 ° C each time, and then heat-treated for 30 minutes. Take out from the furnace, and measure the surface magnetic flux (melting amount) and DC overlap characteristics. These results are disclosed in Figures 32-34. Fig. 32 is a diagram showing changes caused by heat treatment of a surface magnetic beam. From these results, it can be seen that, compared with the case where the sample S-2 magnet that is not covered is demagnetized by 270 ° C by 28%, the magnet inserted in the sample S-1 magnet covered with epoxy resin is inserted. In the core, after the heat treatment at 270 ° C, the deterioration degree also reached a relatively small 8%, showing stable characteristics. Such a system is considered to be capable of suppressing oxidation and suppressing a reduction in melting by coating the surface of the magnet with epoxy resin. In addition, the results of the measurement of the DC superimposition characteristics of the bonded magnets inserted into the gaps of the magnetic core (Figures 1 and 2) are shown in Figures 33 and 34. Referring to FIG. 33, as shown in FIG. 32, the core of the uncoated magnet of the sample S-2 is inserted. As the heat treatment and the melting decrease, the bias magnetic field generated by the magnet is reduced. And at 27 ° C, when the magnetic permeability is about 150 o e, it will switch to the low magnetic field side, causing a significant deterioration in characteristics. In comparison, 'Epoxy-57-584873 covered with the sample V. Description of the invention (56) Resin thing' is shown in Figure 34, and it is only changed at about 5 0 e at 2 70 ° C To the low magnetic field side. In this way, the DC superimposition characteristics can be improved significantly compared with the epoxy-coated and uncoated materials. Example 29 The relationship between the surface coating of a magnet and the amount of a magnetic beam was the same as that of Examples 28 except that the magnet powder was made of polyamide and the surface coating was made of a fluororesin. The fluororesin-coated bonded magnet (sample S-1) and the uncoated resin-bound magnet (sample S-2) as a comparison target were heated from the furnace at 270 ° C in the atmosphere in about 60 minutes. It was taken out, and the fusion | melting measurement and DC superposition characteristic were measured, and heat processing was performed for a total of 5 hours. These results are shown in Figures 35 to 37. Fig. 35 is a graph showing changes caused by heat treatment of the surface magnetic flux. From these results, it can be seen that compared to the case where the magnet of sample S-2 which is not covered is demagnetized by 58% under a treatment of 5 hours, the sample S-1 which is covered with fluororesin is After 5 hours of heat treatment in the core inserted by the magnet, the deterioration degree is also quite small, which is 22%, showing stable characteristics. Such a system is considered to be capable of suppressing oxidation and suppressing a reduction in melting by coating the surface of the magnet with a fluorine-containing resin. In addition, the combined magnets of these samples S-1 and S-2 were respectively inserted into the gaps of the same magnetic core, and the results of measurement of the DC superimposition characteristics are shown in Fig. 36 and Fig. 37. -58- V. Description of the Invention (57) Referring to Fig. 36, the magnet core with sample S-2 not covered with resin was inserted, as shown in Fig. 35. As the heat treatment and melting decrease, the reduction The bias magnetic field generated by the magnet, and after 5 hours, the magnetic permeability was changed to about 30 Oe, and the magnetic field was changed to a low magnetic field side, which caused a significant deterioration in characteristics. In contrast, the magnet coated with the sample S-1 of the fluororesin was switched to the low magnetic field side only at about 100e as shown in Fig. 37. In this way, the direct current superimposition characteristics can be improved significantly compared to those coated with fluororesin and those not covered with resin. From the above, it can be seen that the bonded magnet having a surface covered with a fluororesin is used to suppress oxidation and has excellent characteristics. In addition, the same results can be obtained with other heat-resistant resins or heat-resistant coatings. Example 30 Relationship between resin amount and moldability Magnet powder: Sm2Co17 Average particle size: 5 μm Inherent coercive force: 17KOe Curie point: 810 ° C Adhesive: Polyamide resin Magnet powder and each resin as an adhesive In order to change the resin content between 15 and 40% by volume, without applying an alignment magnetic field, a magnet having a thickness of 0.5 mm was formed by mold forming. As a result, it was found that no matter which resin is used, molding cannot be performed unless the resin content is 30% by volume or more. -59- 584873 V. Description of the Invention (58) The same results can be obtained in epoxy resin, polyurethane resin, silicone resin, polyester resin, aromatic polyamide resin, and liquid crystal polymer. Example 31 The relationship between magnet powder and the superposition characteristics of resin and DC magnet powder: s — 1: Sm2Co17 average particle size: 5 // m coercive force iHc: 15K0e Curie point Tc: 810 ° C quantity: 100 Weight part S — 2 · S m 2 C 〇17 Average particle size: 5 # m Coercive force iHc: 15KOe Curie point Tc: 810 ° C Quantity: 100 weight part S — 3 · Sm2Fe17N3 Average particle size: 3 // m Coercive force iHc: 10.5KOe Curie point Tc: 470 ° C Quantity: 100 weight part S-4: B a Ferrite grain iron average particle size: 1 // m Coercive force iHc: 4KOe Curie point Tc: 450 ° Amount of C: 1 0 0 weight part • 60- 584873 V. Description of the invention (59) S _ 5: S in 2 C 〇j 7 Average particle size: 5 // m Coercive force iHc: 15K0e Curie point Tc: 810 ° Amount of C: 100 parts by weight Adhesive: S-1: Polyamide resin amount: 50 parts by weight S — 2: Epoxy resin amount: 50 parts by weight S-3: Polyamide resin amount: 50 parts by weight S _ 4: Polyurethane resin amount: 50 parts by weight S-5: Polypropylene resin amount: 50 parts by weight Magnet manufacturing method: mold forming, non-aligned magnetic field magnet: thickness: 0.5mm shape and surface : Specific resistance of the cross section of the support below the E-shaped iron core: 1 Ω · cm or above. Inherent coercive force: Same as magnet powder. Magnetization: Pulse magnetization. Magnetic field: 4T. Magnetic core: EE core (Fig. 1): MnZn fertilizer particles. Ferromagnetic gap

-61-584873 V. Description of the invention (60) Length G: 0 · 5 mm DC overlap characteristics (permeability): Measured in the range of f = ΙΟΟΚΗζ, Hm = 0 to 2000e. For each sample S-1 to S — 5 same magnetic cores were repeated 4 times at 270 ° (: Hold for 30 minutes, then sent to normal temperature cooling treatment, and DC overlap characteristics were measured before and after each heat treatment. For each sample total 5 times The measurement results are shown in Fig. 38 to Fig. 42. It can be seen from Fig. 42 that the magnet in which the Sm2C〇17 magnet powder was dispersed in the polypropylene resin sample S-5 was inserted into the magnetic core arranged in the gap. After 2 times, the DC overlap characteristics will be greatly deteriorated. This is because the thin permanent magnets are deformed due to re-soldering. The Ba fertilizer iron with a coercive force of only 4KOe is dispersed in the polyamide resin. As shown in Figure 41, the magnet of sample S-4 was inserted into the core. It can be seen that as the number of measurements increases, the DC overlap characteristic will also deteriorate significantly. On the contrary, it can be seen that the coercive force is lOKOe. Magnetic The magnets of samples S-1 to S-3 of iron powder and polyamide or epoxy resin are inserted into the core arranged in the magnetic gap as shown in Figures 38 to 40. Even after repeated measurement, The DC superimposed characteristics will not change much and show quite stable characteristics. With these results, in order to reduce the coercive force of the ferrous iron magnet, the reverse magnetic field applied to the magnet is used to demagnetize, or Cause reversal of magnetization, and

-62- 584873 V. Description of the Invention (61) It can be inferred that the deterioration of the DC overlap characteristic. In addition, it can be seen that the magnet inserted into the core is a magnet having a coercive force of 10 kOe or more, and exhibits excellent DC superposition characteristics. In addition, although not disclosed in this embodiment, it is also confirmed that combinations other than this embodiment can be confirmed even when using polyphenylene ether sulfide resin, silicone resin, polyester resin, aromatic polyamide resin, The same effect can be obtained in a thin-plate magnet made of a resin selected from liquid crystal polymers. Example 32 Relationship between the particle size of magnetic powder and core loss Magnet powder: Sm2Co17 Curie point: 810 ° CS-1: average particle size: 2.0 # m, coercive force iHc: lOKOe S-2: average particle size: 2.5 // m, coercive force iHc: 14KOe S-3: average particle size: 25 // m, coercive force iHc: 17KOe S-1 4: average particle size: 50 // m, coercive force iHc: 18KOe S-5: average particle size : 55 / zm, coercive force iHc: 20KOe Adhesive: polyphenylene ether sulfide resin resin amount: 30% by volume Magnet manufacturing method: mold forming, non-oriented magnetic field magnet · Thickness: 0 · 5 m in shape • Area: E-shaped iron core Specific resistance of the lower support section: S— 1: 〇 · 〇1 Ω · cm S-2: 2.0 Ω · cm S-3: 1.0 Ω · cm 0.5 Ω · cm S— 4

-63- 584873 V. Description of the invention (62) S-5 ·· 0.015 Ω · cm Inherent coercive force: same as magnet powder magnetization: pulse magnetizer magnetizing magnetic field 4T magnetic core: EE core (Figure 1): Ferromagnetic gap length G of MnZn fertilizer particles: 0.5mm Core loss: The core loss measured at 300KHz, Ha = 0.1T is shown in Table 14. [Table __ Sample S-1 S-2 S — 3 S — 4 S — 5 Particle size (// m) 2.0 2.5 25 50 55 Core loss (kW / m3) 670 520 540 555 790 Available from Table 14 It is known that the powder used for the magnets of the permanent magnets for bias magnets has an average core particle diameter of 2 · 5 ~ 5 0 // m and has excellent core loss characteristics. Example 33 Relationship between roughness (gloss) and melting (surface magnetic flux) Magnet powder: Sm2Co17 Average particle size: 5 / zm Coercive force iHc: 17KOe Curie point: 810 ° C Adhesive ·· Polyamide resin Resin content: 40% by volume -64- 584873 V. Description of the invention (63) Magnet manufacturing method: mold forming (on one side, it changes with the pressing pressure), magnetization without alignment magnetic field: pulse magnetization magnetic field 4 T magnet : Thickness: 0.3mm, lcmXlcm Specific resistance: 1 Ω · cm or more Inherent coercive force: 17KOe The surface magnetic flux (melt) and gloss (roughness) of the above magnets were measured. The results are shown in Table 15. : Table 15] ___ Roughness (%) 15 21 23 26 33 45 Gauss 42 5 1 54 99 101 102

From the results in Table 15, the bonded magnet having a roughness of 25% or more has excellent magnetic properties. This is because the roughness of the manufactured bonded magnet is more than 25%, so the filling rate of the thin plate magnet is formed to be more than 90%. In addition, the same effect can be obtained by using a resin selected from polyphenylene ether sulfide resin, silicone resin, polyester resin, aromatic polyamide resin, and liquid crystal polymer as an adhesive. Example 34 Relationship between roughness and melting and compression ratio Magnet powder: Sm2Co17 Average particle size: 5 // m Coercive force iHc: 17KOe Curie point: 810 ° C -65- 584873 V. Description of the invention (64) Adhesive : Polyamide resin resin content: 40% by volume Magnet manufacturing method: Squeegee method, no orientation magnetic field, hot stamping after drying (variation of stamping pressure) Magnetization: Pulse magnetization Magnetizing magnetic field 4T Magnet: Size: lcmXlcm, thickness : 500 // m Specific resistance: 1 Ω · cm or more Inherent coercive force: 17KOe By changing the pressure of hot stamping, 6 different samples with compression ratios of 0 to 21 (%) can be obtained. For each sample, the gloss and surface magnetic flux (melting) were measured. The results are shown in Table 16. [Table 16] _ Roughness (%) 9 13 18 22 25 28 Melt (Gauss) 34 47 51 55 100 102 Compression ratio (%) 0 6 11 14 20 21 According to the results in Table 16, the roughness reaches 25% or more The combined magnet has excellent magnet characteristics. This reason is also that when the roughness reaches 25% or more, the filling rate of the combined magnet will be formed at 90% or more. In addition, from the viewpoint of the compression ratio, it can be known that when the compression ratio reaches 20% or more, good magnetic properties can be obtained. This reason is also that when the compression ratio reaches 20% or more, the charge rate of the combined magnet is formed at 90% or more.

-66- 584873 V. Description of the Invention (65) As the adhesive, a tree moon purpose selected from polyphenylene ether sulfide resin, silicone resin, polyester resin, aromatic polyamide resin, and liquid crystal polymer is used. The same effect can be obtained. Example 35 Relationship between Addition of Surfactant and Core Loss Magnet Powder: Sm2Co17

Average particle size: 5.0 // m Coercive force iHc: 17K0e Curie point Tc: 810 ° C Additive: Interface active material: S — 1: Sodium phosphate 0.5wt% S — 2: Carboxymethyl cellulose sodium salt 0 · 5 wt% S- 3: Sodium silicate 0.3 wt% S-4 ·· No adhesive: Polyphenylene ether sulfide resin resin volume (volume: 35 vol%) Magnet manufacturing method: mold forming, non-aligned magnetic field magnet: thickness: 0.5 mm Shape and area: Specific resistance of the cross section of the support under the E-shaped iron core ·· 1 Ω · cm or more Inherent coercive force: Magnetization: Pulse magnetization

Magnetic field 4T Magnetic core: EE core (Figure 1): MnZn ferrite magnetic gap -67- 584873 V. Description of the invention (66) Length G: 0.5mm Core loss: f = 3 00KHz, Ha = 0.1T The measured core losses are shown in Table 17. [Table 1 7] Sample name Core loss (kW / m3) S— 1 Sodium phosphate additive 495 S- 2 Carboxymethyl cellulose sodium salt additive 500 S- 3 Sodium silicate 485 S- 4 Without additive 590 By Table 17 shows that the samples with added surfactants exhibited good core loss characteristics. This is to prevent primary particle aggregation by adding a surfactant, and to suppress eddy current loss. In this example, the results obtained by adding phosphate are shown. However, even if a surfactant other than this is added, a result with good core loss characteristics can be obtained in the same manner. Example 36 Relationship between specific resistance and core loss Magnet powder: Sm2Co17 Average particle size: 5.0 // m Coercive force iHc: 17KOe Curie point: 810 ° C Adhesive: Polyamide resin resin amount: Adjusting magnet manufacturing method: Mold Shaped, non-aligned magnetic field -68- 584873 V. Description of the invention (67) Magnet: Thickness: 0.5mm Shape • Area: Specific resistance of the cross section of the support under the E-shaped core · cm): S — 1: 0.05 S- 2 : 0.1 S- 3: 0.2 S- 4: 0.5 S-5 · 1.0 Inherent coercive force: 17KOe Magnetizing: Pulse magnetizing magnetizing magnetic field 4 T Magnetic core: EE core (Figure 1): MnZn ferrite grain ferromagnetism Gap length G: 0 · 5 mm Core loss: Table 1 8 shows the core loss after measurement at f = 300KHz and Ha = 0.1T.

-69- 584873 V. Description of the invention (68) [Table 18] _ Sample S- 1 S-2 S — 3 S — 4 S — 5 Specific resistance (Ω · cm) 0.05 0.1 0.2 0.5 1.0 Heart loss (kW / m3) 1220 530 520 515 530 As can be seen from Table 18, a magnetic core with a specific resistance of 0.1 Ω · cm or more shows good core loss characteristics. This is because the eddy current loss can be controlled by increasing the specific resistance of the thin-plate magnet. Example 37 Relationship between specific resistance and core loss and DC overlap characteristics Magnet powder: Sm2C〇17 Average particle size: 5 · 0 // m Inherent coercive force iHc: 17KOe Curie point Tc: 810 ° C Adhesive: Polyfluorene Amine resin amount: adjusted (Table 19) Magnet manufacturing method: mold forming, no orientation magnetic field, hot stamped magnet: thickness: 0.5mm shape / area: cross section specific resistance (Ω · cm) of support section under E-shaped core: S—1: 〇 · 〇5 S—2: 0 · 1 S—3: 0.2 -70- 584873 V. Description of the invention (69) S—4: 0.5 S—5: 1.0 Inherent coercive force: 17KOe magnetization ·· Pulse magnetization magnetizing magnetic field 4 T Magnetic core: EE core (Figure 1): MnZn ferrite ferromagnetic gap length G: 0.5mm Core loss: f = 300KHz, Ha = 0.1T to measure the DC-DC overlap characteristics (transparent Magnetic susceptibility) ·· Make it change in the range of f = 10OKHz, Hm = 0 ~ 2000e to measure the same magnetic core, measure the core loss of each sample, the measurement results are shown in Table 1 0 0-71-584873 V. Description of the invention (7 〇) [Table 19] Sample magnet composition Resin ratio Specific resistance core loss (vol%) (Ω · cm) (kW / m3) S— 1 20 0.05 1230 S— 2 30 0.1 530 S— 3 S1Π2 Co] 7 35 0.2 520 S — 4 40 0.5 515 S — 5 50 1 530 It can be seen that a magnetic core having a specific resistance of 0.1 Ω · cm or more shows a good core loss characteristic. This is because the eddy current loss can be controlled by increasing the specific resistance of the thin-plate magnet. In addition, the same magnetic core was a magnet using the sample S-2, and the process was repeated 4 times and kept at 270 ° C for 30 minutes and then cooled to normal temperature. The DC overlap characteristics were measured before and after each heat treatment. The measurement results in total 5 times are shown in Fig. 43. In Fig. 43, for comparison purposes, the DC superimposition characteristics are also shown when no magnet is inserted in the magnetic gap. As a comparative example (S-6), the same measurement results are shown in Fig. 44 for a magnet using Ba ferrite powder (iHc = 4KOe) as the magnet powder. It can be seen from Fig. 44 that the core of a thin-plate magnet inserted with Ba ferrite and iron with a coercive force of only 4 KOe has a significant deterioration in DC superimposition characteristics as the number of measurements increases. This system reduces the coercive force to apply

-72- 584873 V. Description of the invention (71) The inverse magnetic field to the thin-plate magnet is used to demagnetize, and it can be estimated that it causes the reversal of the magnetization and the DC superposition characteristics are deteriorated. In contrast, it can be seen from FIG. 43 that the magnetic core of the thin plate magnet inserted with the sample S-2 with a coercive force of 15K0e does not change much even after repeated measurement, and it shows a fairly stable DC overlap. characteristic. Example 38 The relationship between the particle diameter of the magnet powder and the average thickness of the center line and the magnetic flux on the magnet surface Magnet powder: Sm2Co17 Average particle diameter (W in): Refer to Table 2 0 Adhesive: Polyamide resin resin amount: 40% by volume Magnet Manufacturing method: Squeegee method, non-aligned magnetic field, hot stamping magnet: thickness: 0.5mm shape • area: specific resistance of support section cross section below E-shaped core: 1 Ω · cm or more inherent holding force: 17KOe magnetic core: EE core (Figures 1 and 2): Ferromagnetic gap length G of MnZn fertilizer grains: 0 · 5 mm to change the stamping pressure during hot stamping. Samples S-1 to S-6 shown in Table 20 were obtained. Measure the surface magnetic flux, the average thickness of the center line, and the amount of bias of each sample. The results are shown in Table 20. [Table 20] -73- V. Description of the invention (72) Sample average particle size (// m) Old diameter (// m) Pressing pressure (kgf / cm2) during hot stamping Average thickness of centerline (βτη) Melting amount (Gauss) Bias amount (Gauss) S-1 2 45 200 1.7 30 600 S — 2 2.5 45 200 2 130 2500 S-3 5 45 200 6 110 2150 S — 4 25 45 200 20 90 1200 S — 5 5 45 100 12 60 1100 S-6 5 90 200 15 100 1400 In the sample S-1 with an average particle diameter of 2.0 // m, when the melting amount decreases, the amount of bias magnetism decreases. This is considered to be because the magnet powder is oxidized during the manufacturing process. In addition, for sample S-4 with a large average particle size, it is possible to consider that the melting rate is low due to the low powder filling rate, and that the surface roughness of the magnet is relatively coarse. The deterioration of the adhesiveness causes a decrease in magnetic permeability and a decrease in the amount of bias. In addition, even if the particle size is small, the sample S-5 series with insufficient pressing pressure and large surface roughness is the result that the melting amount decreases due to the low powder filling rate, which further reduces the amount of bias magnetism. For sample S-6 mixed with coarse particles, the surface roughness is considered to be relatively coarse, and the amount of bias magnetism is reduced. 'From these results, it can be known that the average particle diameter of the magnetic powder is 2.5 // m or more and 25 // m or less and the maximum particle size is 50 // m or less. The average thickness of the center line Ra is 10. // When a thin plate magnet below m is inserted into the magnetic core -74- 584873 V. When the gap of the invention description (73), superior DC superposition characteristics can be obtained as shown. Example 3 9 Relationship between types of magnets (inherent coercive force) and DC superimposition characteristics Magnet powder: 6 types of S-1 to S-6 (Magnet powder and amount are shown in Table 21) Adhesive: Type and content revealed In Table 21, magnet manufacturing method: S-1'S-4, S-5'S-6: mold forming, hot stamping, non-aligned magnetic field S-2: scraper method, hot stamping S-3: hardened magnet after mold forming: thickness T: 0.5mm Shape / area: Specific resistance of the cross section of the support under the E-shaped core: All samples are (K1Ω · cm Inherent coercive force (iHc): Same as magnet powder Magnetization: Pulse magnetizer Magnetizing magnetic field 4 T Magnetic core: EE core (Figure 1): MnZn ferrite ferromagnetic gap length G: 0.5mm DC overlap characteristic (permeability): measured at f = 100KHz, Hm = 350e. Each sample was tested at 270 ° C. After 30 minutes of heat treatment in the reflow furnace, the DC overlap characteristics were measured again. As a comparative example, it was also applied to the case where no magnet was inserted in the gap of the magnetic core.

-75- 584873 V. Description of the invention (74) Measurement. In this case, before and after the heat treatment, the DC superimposition characteristics (effective magnetic properties, etc.) must be 70, which does not change even with the heat treatment. The measurement results of each sample are shown in Table 21. [Table 21] Sample magnet composition iHc (KOe) Mix ratio β e (at350e) Before reflow β e (at 3 5 Oe) Resin composition S-1 Sm (Coo ^ Feo ^ oCiiQ ^ jZro ^) 7.7 15 100 parts by weight 140 130 Aromatic polyamine resin-100 parts by weight S — 2 Sm (C〇〇) 7.7 15 100 parts by weight 120 120 Soluble polyamines month purpose 100 100 thunder section S-3 Sm (Co0 742Fe 〇2〇Cu〇055Zr0〇29) 7.7 15 100 Lightning part 140 120 Epoxy resin-100 weight part S-4 Sm2Fe17N3 Magnet powder 10 100 weight part 140 70 Aromatic polyamide resin-100 weight part S — 5 Ba Ferrous iron powder 4.0 100 Lightning section 90 70 Aromatic polyamine resin — 100 parts by weight S — 6 Sm (Co0 742Fe0 2〇Cu〇055Zr0 〇29) 7.7 15 100 parts by weight 140 Polypropylene resin—100 weight The DC overlap characteristics (permeability V) of each of the samples S-2 and S-4 with the comparative sample are disclosed in Figs. 4-5. Based on these results, it can be inferred that in order to reduce the coercive force, the Ba ferrite-iron-bonded magnet (sample S-5) is demagnetized by applying a reverse magnetic field to the bonded magnet or causing reversal of magnetization As a result, the DC superposition characteristic is deteriorated. -76- 584873 V. Description of the invention (75) In addition, the SmFeN magnet (sample S-4) is a substance with high coercive force. In order to reduce the Curie point Tc to 47 0 ° C, thermal demagnetization occurs. It can be presumed that the multiplication effect of the demagnetization caused by the reverse magnetic field causes deterioration in characteristics. On the other hand, it can be seen that as a bonded magnet inserted into the gap of the magnetic core, a bonded magnet having a coercive force of 10KOe or more and a Tc of 500 ° C or more (samples S-1 to S-3, S-6) The display has superior DC overlap characteristics. Example 40 Relationship between specific resistance and core loss Magnet powder · Sm (CoojuFeo aoCuo owZro on) 7 7 Average particle size: 5 // m Coercive force iHc: 15KOe Curie point Tc: 810t: Adhesive: Polyurethane resin Resin content: adjustment (table) Magnet manufacturing method: Squeegee method, hot stamping after drying, non-orientation magnetic field Magnet: thickness: 0.5mm shape • area: specific resistance of the cross section of the support under the E-shaped core (Ω · cm) : S — 1: 0 · 06 S— 2: 0 · 1 S — 3: 0.2 S-4: 0 · 5 S- 5: 1 · 0 Inherent coercive force: 15KOe -77- 584873 V. Description of the invention (76) Magnetizing: Pulse magnetizing magnetic field 4T Magnetic core: EE core (Fig. 1): MnZn ferrite ferromagnetic gap length G: 0.5mm Core loss · Measured at f = 300KHz, Ha = 0.1T 'Measure f M The core loss of the magnet in each sample of the same magnetic core. The measurement results are shown in Table 22. [Table 22] Sample magnet composition resin amount (vol%) Specific resistance (Ω · cm) Core loss (kW / m3) S- 1 25 0.06 1250 S-2 30 0.1 680 S-3 Sm (Co0 742Fe0 20Cu0 055Zr0 029) 7.7 35 0.2 600 S — 4 40 0.5 530 S-5 50 1.0 540 As a comparative example, the core loss characteristics of an EE core with the same clearance are 520 (kW / m3) under the same measurement conditions. As can be seen from Table 22, the core loss is a magnetic core having a specific resistance of 0.1 Ω · cm or more. The core has a good core loss characteristic. This is because the eddy current loss is controlled by giving the specific resistance of the thin-plate magnet. [Possibility of industrial use] With the present invention, it is possible to easily and inexpensively provide a magnetic core having superior DC superimposition characteristics and core loss characteristics, and an inductor using the magnetic core. -78- 584873 V. Description of Invention (77) Component . In particular, a thin-plate magnet with a thickness of 500 // m or less can be obtained as a magnet for bias magnetism, and the miniaturization of the magnetic core or the inductance member can be achieved. In addition, strong and thin bias magnets can also be realized in terms of solder reflow temperature, so they can be miniaturized and can be surface-mounted or inductive components themselves. Brief Description of the Drawings Figure 1 shows a perspective view of a magnetic core according to an embodiment of the present invention. Fig. 2 is a front view of an induction member formed by applying a winding wire to the magnetic core of Fig. 1. Fig. 3 is a perspective view of a magnetic core according to another embodiment of the present invention. Fig. 4 is a front view of an induction member formed by applying a winding wire to the magnetic core of Fig. 3. FIG. 5 shows a comparison example of the third embodiment, in which measurement data on the change in permeability (DC overlap characteristic) of the DC superimposed magnetic field Hm with respect to a magnetic core formed by a bias magnet is overlapped (DC superimposed characteristics). The schematic. As shown in FIG. 6, when a ferrous iron magnet (sample S-1), which is a bias magnet for the third embodiment, is inserted into the magnetic gap, the DC superimposed magnetic field Hm of the magnetic core is changed. Schematic diagram of measurement data related to the change in permeability (DC overlap characteristic). Fig. 7 shows the case where the Sm-Fe-N magnet (sample S-2), which is the bias magnet for the third embodiment, is inserted into the magnetic gap, and the DC superimposed magnetic field Hm of the magnetic core is And about the magnetic permeability //

-79- Fifth, the invention description (78) changes (direct current overlap characteristics) measurement data overlapping schematic ° ° Figure 8 shows the Sm-Co magnets (samples will be used as the bias magnets of the third embodiment) S — 3) Schematic diagram of superimposing the measurement data on the change in magnetic permeability (DC overlapping characteristics) with respect to the DC overlapping magnetic field Hm of its magnetic core when it is inserted into a magnetic gap. Fig. 9 shows the sixth embodiment. In the case of using the sample magnets S-1 to S-4 with various amounts of resin, the DC core superimposing characteristics (permeability) of the magnetic core // Measurement data. Fig. 10 shows the seventh embodiment. In the case where a bias magnet (sample S-1) with a titanium coupling agent is used, the DC superposition characteristics (permeability) of the magnetic core at different temperatures are used. // Schematic diagram of measurement data of frequency characteristics at different temperatures. Fig. 11 shows the seventh embodiment. In the case where a bias magnetic magnet (sample S-2) with an organic silane coupling agent is used, the DC superposition characteristics (frequency of magnetic permeability at different temperatures) of the magnetic core are used. Measurement data of characteristics. Figure 12 shows the seventh example. In the case of using a bias magnet (sample S-3) without a coupling agent, the DC superposition characteristics of the magnetic core (different permeability) The measurement data of the frequency characteristics at temperature. Fig. 13 shows the eighth embodiment. The resin-bonded bonded magnet (sample S-2) and the epoxy-coated surface bonded magnet (sample S-) 2) After the heat treatment, the measurement data showing the change of its melting amount is displayed. -80- 584873 V. Description of the Invention (79) The 14th figure shown in the eighth embodiment is a combination of uncoated magnets ( Sample S-2) The measurement data of the DC superimposition (permeability //) is shown in the case of a heat treatment at a temperature different from that of a magnetic core formed by inserting a magnetic gap as a magnet for bias magnetization, as shown in Fig. 15 Tied to the 8th implementation In the case where a bonded magnet (sample S-1) covered with epoxy resin is heat-treated at a temperature different from that of a magnetic core formed by inserting a magnetic gap as a bias magnet, the DC superimposition (permeability) is shown. A) Measurement data. In the ninth embodiment shown in Figure 16, the unbonded bonded magnet (sample S-2) and the bonded magnet (sample S-1) coated with a fluorine-containing resin on the surface are heat treated. In the case of the case, the measurement data of the melting amount change with respect to the heat treatment time is shown. Fig. 17 shows the ninth embodiment in which the resin-coated bonded magnet (sample S-2) is biased with the insertion. When the magnetic core formed by the magnetic gap of the magnet has been heat-treated, it shows the measurement data of the DC overlap characteristics (permeability //) in different heat-treatment time. Figure 18 is shown in the ninth embodiment. The magnetic core formed by bonding a bonded magnet (sample S-1) coated with a fluororesin to a magnetic gap inserted as a magnet for bias magnets has been shown to be different when it has been heat-treated. Measurement data of DC overlap characteristics (permeability //) during processing time. As shown in FIG. 19, in the eleventh embodiment, a magnet (sample S-1) formed by Sm2Fe17N3 magnet powder and polypropylene resin is inserted into the magnetic field. between

-81-584873 V. INTRODUCTION OF THE INVENTION In the case of (so) gap, the DC superimposition (permeability //) of the magnetic core is related to the measurement data of each measurement. Fig. 20 shows the case where the magnet (sample S-1) formed by Sm2Fe17N3 magnet powder and 1 2 -nylon is inserted into the magnetic gap in the n-th embodiment, "the DC superposition of the magnetic core (permeability) //) Measurement data about the number of each measurement. Fig. 21 shows that in the π embodiment, when a combined magnet formed of Ba ferrous iron and 12-nylon resin is inserted into a magnetic gap, the DC superimposition (permeability #) of the magnetic core is related to each Measurement data of the number of measurements. Fig. 22 shows the measurement data of the number of measurements per time for the DC overlap (permeability V) of the magnetic core of the magnetic core without using a thin plate magnet in the gap in the 11th embodiment. Figure 23 shows the DC superimposition characteristics (permeability //) of the magnetic core in the case where each magnet sample (S-1 to S-3) in the 17th embodiment is inserted into the magnetic gap. Measurement data before and after reflow (reflow). Fig. 24 shows the eighteenth embodiment. In the case where a magnetic sample (S-1 to S-3) with a different adhesive is inserted into the magnetic gap, the magnetic core DC overlap characteristics (permeability //) measurement data before and after reflow. Figure 25 shows the case where the magnet samples (S-1 to S-3) of the 19th embodiment are inserted into the magnetic gap, and the DC of the magnetic core is -82-584873. V. Description of the invention ( 81) Measurement data of overlap characteristics (permeability //) before and after reflow. FIG. 26 shows the return of the DC superimposing characteristics (permeability //) of the magnetic core when each magnet sample (S-1 to S-3) in the 20th embodiment is inserted into the magnetic gap. Measurement data before and after welding. Fig. 27 shows a 21st embodiment in which a magnetic sample (S-1 to S-8) using magnet powders having different average particle diameters is inserted into a magnetic gap, and the DC superposition characteristic of the magnetic core is shown in Fig. 27. (Permeability //) Measurement data before and after reflow. Fig. 28 shows the 23rd embodiment. When magnetic samples (S-1 and S-2) using different Sm-Co magnet powders are inserted into the magnetic gap, the DC superposition characteristics of the magnetic core ( Permeability (μ) measurement data before and after reflow. Fig. 29 shows the 24th embodiment. In the case where magnet samples (S-1 to S-3) using different adhesives are inserted into the magnetic gap, the DC superposition characteristics (permeability / Z of magnetic permeability) of the magnetic core are inserted. ) Before and after reflow. Fig. 30 shows the 26th embodiment. In the manufacture of a magnet, when a magnet sample using an alignment magnetic field and an unused magnet sample (S-1 and S-2) are inserted into a magnetic gap, Measurement data of DC core overlap characteristics (permeability //) of magnetic core before and after reflow. Figure 31 shows the 27th embodiment. When a magnetic sample (S-1 to S-5) with a different magnetic field is inserted into the magnetic gap, the DC superposition characteristics of the magnetic core (transparent) Measurement of magnetic susceptibility //) before and after reflow

-83- V. Description of Invention (82) Materials. FIG. 32 shows the case where the bonded magnet (sample S-2) not covered with resin and the bonded magnet (S-1) whose surface is covered with epoxy resin are subjected to heat treatment in the 28th embodiment. Measurement data of melting amount change at heat treatment temperature. Figure 33 shows the direct current at different heat treatment temperatures of the magnetic core formed by the magnetic gap formed as the magnetic gap of the magnet for bias magnets in the 28th embodiment by inserting a bonding magnet (sample S-2) not covered with resin. Measurement data of overlap characteristics (permeability //). As shown in FIG. 34, in the 28th embodiment, a bonded magnet (sample S-1) coated with an epoxy resin is inserted into a magnetic core formed by a magnetic gap serving as a magnet for bias magnets at different heat treatment temperatures. Measurement data of DC superimposition characteristics (permeability //). Fig. 35 shows the case where the bonded magnet (sample S-2) not coated with resin and the bonded magnet (sample S-1) coated with a fluorine-containing resin are heat-treated in the 29th embodiment. Measurement data showing changes in its melting amount. Figure 36 shows the direct current at different heat treatment temperatures of the magnetic core formed by the magnetic gap formed as the magnetic gap of the magnet for bias magnets in the 29th embodiment by inserting a bonded magnet (sample S-2) not covered with resin. Measurement data of overlap characteristics (permeability //). Figure 37 shows the 29th embodiment. The bonded magnet (sample S-1) coated with a fluororesin is inserted into the magnetic space as a magnet for bias magnets. -84- V. Explanation of the invention (83) Measurement data of DC overlap characteristics (permeability //) of the formed magnetic core at different heat treatment temperatures. Fig. 38 shows that in the 31st embodiment, a bonded magnet (sample S-1) formed by a Sm2C17 magnet and a polyamide resin is inserted into a magnetic gap serving as a magnet for bias magnetization, and the formed magnet is formed. Measurement data of DC overlap characteristics (permeability //) of a magnetic core exposed to repeated heat treatment. Figure 39 shows the combination of a Sm2Co17 magnet and an epoxy resin (sample S-2) in the 31st embodiment, and the magnetic core formed by the magnet is used as a magnetic gap for the bias magnet. Measurement data of DC overlap characteristics (permeability //) when exposed to repeated heat treatment. Figure 40 shows the combination of a Sm2Fe17N3 magnet and a polyamide resin (sample S-3) in the 31st embodiment, and inserts it into a magnetic gap as a magnet for bias magnetization. Measurement data of DC superimposition characteristics (permeability //) when the magnetic core is exposed to repeated heat treatment. Figure 41 shows the combination of a ferrite magnet made of Ba fertilizer and a polyamide resin, as shown in Figure 31. The magnet (sample S-4) was inserted into the magnetic gap of the magnet for bias magnetization, and the DC core overlap characteristics (permeability V) when the formed magnetic core was exposed to repeated heat treatment were measured. Brother 4 2 is not related to Brother 3 1 in the example. 'The combined magnet (sample S-5) formed by the S m 2 C 〇! 7 magnet and polypropylene resin is inserted into the magnetic gap as the magnet for bias magnetism. ， Measurement data of DC overlap characteristics (permeability //) of the formed magnetic core when exposed to repeated heat treatment. -85- 584873 V. Description of the invention (84) Figure 4 3 shows in the 37th embodiment. The combined magnet of sample s-2 is inserted into the magnetic gap as the magnet for bias magnetization, and formed by Measurement data of DC overlap characteristics (permeability #) of magnetic cores exposed to repeated heat treatment. Fig. 44 shows the DC superimposition characteristics when the bonded iron of the comparative example (sample s-6) was inserted into the magnetic gap as a bias magnet in the 37th embodiment, and the magnetic core was exposed to repeated heat treatment ( Permeability #). Figure 45 shows the 39th embodiment. The DC-overlap characteristics of the magnetic core formed by inserting the combined magnets of sample S-2 and sample S-4 into the magnetic gap and not inserting the magnetic gap (permeability / /) Measurement data before and after reflow. [Illustration of Symbols] 1-4: Permanent magnet 2 ·· Iron core 3 ·· Coil 5: Iron powder core -86-

Claims (1)

584873 VI. Patent application scope No. 901 2221 9 "Permanent magnet, magnetic core using it as magnetic offset magnet and inductive member using it" (revised on November 7, 1992) Six patent application scope: 1. A permanent magnet, characterized in that the combined magnet formed by dispersing magnet powder in a resin has a specific resistance of 0.1 Ω · cm or more. The magnet powder has an inherent coercive force of 5KOe or more and a Curie point Tc. It can reach 300 ° C or more and the powder particle size is 150 / zm or less. 2. The permanent magnet of item 1 in the scope of patent application, wherein the average particle diameter of the aforementioned magnetic powder is 2.0 to 50 / im. 3. If the permanent magnet of item 1 of the patent application scope, wherein the volume ratio of the aforementioned resin content is 20% or more. 4. The permanent magnet according to item 1 of the patent application range, wherein the aforementioned magnet powder is a rare earth magnet powder. 5 · If the permanent magnet of item 1 of the patent application scope, the forming compression rate is more than 20%. 6) The permanent magnets according to item 1 or 4 of the scope of patent application, wherein the rare earth magnet powders used in the aforementioned combined magnets are added with an organic silane coupling agent and a titanium coupling agent. 7 · The permanent magnet of item 1 in the scope of the patent application, wherein the aforementioned bonded magnet is anisotropic by aligning the magnetic field at the time of production. 8. The permanent magnet according to item 1 of the patent application, wherein the aforementioned magnetic powder is coated with a surfactant. 9 · If the permanent magnet in item 1 of the scope of patent application, the average thickness of the center line is 584873 6. The scope of patent application is 10 // m or less. I 0 · If applied for gf patent range _ $ i permanent magnet, the thickness of the whole is 50 ~ 10000 / / II · If the permanent magnet of the patent application No. 10 range, which has 1 Ω • cm or more Specific resistance. 1 2 · The permanent magnet according to item 丨 丨 of the patent application scope, which is manufactured by mold forming. 1 3 · The permanent magnet of item π in the scope of patent application, which is manufactured by hot stamping. 1 4 · If the permanent magnet of item 丨 in the scope of patent application, the overall thickness is 500 // m or less. 1 5 · The permanent magnets according to item 4 of the patent application range, which are made of a mixed coating of resin and magnet powder by a film-forming method such as a doctor blade method and a printing method. 16 · If the permanent magnets in the scope of item 14 or item 15 of the patent application scope, the surface roughness (gloss) is more than 25%. 17. The permanent magnet according to item 1 of the scope of patent application, wherein the aforementioned resin is selected from at least one of polypropylene resin, 6-nylon resin, 12-nylon resin, polyamide resin, polyethylene resin, and epoxy resin. . 18. The permanent magnet according to item 1 of the scope of the patent application, wherein the surface of the magnet is coated with a resin having a heat-resistant temperature of 120 ° C or higher, or a heat-resistant paint. 1 9. As for the permanent magnet of item 1 in the scope of patent application, of which the aforementioned magnetic powder is 584873 6. The scope of patent application is the rare earth powder with white SmCo, NdFeB, SmFeN 20 Permanent magnets, in which the inherent coercive force of the aforementioned magnet powder is above lOKOe, the Curie point is above 500 ° C, and the diameter of the powder is 2 5 to 50 U m ° 21 The powder is a rare earth magnet powder having SmCo. 22 If the permanent magnet of item 21 of the patent scope is requested, the aforementioned SmCo rare earth magnet powder is SmCCObdFeo.ihQ. ^ Cuuh 0. 0 6z r 0. 0 2 to 0.03) 7.0 〇 ~ 8. 5 23 • For example, the permanent magnet of the 21st or 22nd patent scope of the main 5 patents, in which the resin described above contains more than 30% by volume. 2 4. If the permanent magnet of the patent No. 23 is stringed, the aforementioned resin is a thermoplastic resin having a softening point of 250 ° C or more. 25. If you apply for a permanent magnet in the range of item 23, the aforementioned resin is a thermosetting plastic with a carbonization point of 250 ° C or more. 26. The permanent magnet according to item 23 of the patent, wherein the aforementioned resin is made of polyamide resin, polyimide resin, epoxy resin, polyphenylene ether sulfide resin, silicone resin, polyester resin, and aromatic resin. At least one selected from the group of polyamine resins and liquid crystal polymers. 27. — A magnetic core having magnetic properties of a bias magnet disposed near the magnetic gap in order to supply a bias magnet from both ends of the gap in a magnetic core having a magnetic gap of at least one magnetic circuit Iron Heart, Chit-3-Sign 584873 6. The scope of patent application lies in the fact that the magnet for bias magnets has permanent magnets in any of the scope of application patent No. 丨 ~ 26. 28. —A kind of magnetic core 'is used in the magnetic core having the scope of patent application No. 27. It is characterized in that the aforementioned magnetic gap has a gap length of about 50 m to 1 m. 2 9. A type of fe core in a magnetic core having the scope of patent application No. 28 is characterized in that the aforementioned magnetic gap has a gap length larger than about 500 to m. A magnetic core of 3 0 · in a magnetic core having item 29 of the patent application 'is characterized in that the aforementioned magnetic gap has a gap length of about 500 μm or less. 31. An inductance member in a magnetic core having any one of claims 27 to 30 in the scope of patent application, characterized in that it has at least one coil of 1 turn (t u r η) or more applied.