Powder magnetic core and HF reactor therewith

A powder magnetic core, powder technology, applied in the direction of inductance with magnetic core, inductor, magnetic core/magnetic yoke, etc., can solve the problems of reduced insulation between powder particles, deterioration of frequency characteristics, increase of eddy current loss, etc., to ensure Excellent insulation and frequency characteristics

Inactive Publication Date: 2005-05-11
TOKIN CORP
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the filling rate is increased by this method, the insulation between the powder particles decreases, which leads to an increase in eddy current loss and deterioration of frequency characteristics.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Powder magnetic core and HF reactor therewith
  • Powder magnetic core and HF reactor therewith
  • Powder magnetic core and HF reactor therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh and mix the required amount of silicone resin, silane-based coupling agent, MgCO 3 powder, MgO powder, using a metal mold at room temperature at 15ton / cm 2 pressure forming to obtain a dust core in the shape of a spiral tube with an outer diameter of 20 mm, an inner diameter of 10 mm, and a thickness of 5 mm. Table 1 shows the weighed composition of the above-mentioned components in this example. Here, four types of powder magnetic cores were produced as examples, and one type of powder magnetic core was produced as a comparative example.

[0031] silicone resin

[0032] Then, the dust core was heat-treated at 800° C. for 2 hours in nitrogen to heat-treat the silicone resin and remove deformation during powder molding. Next, this dust core was housed in a case made of an insulator and wound, and the DC superposition characteristic was measured with a 4284A precision instrument manufactured by Hi-Rad Packard Co., Ltd. (hereinafter referred to as HP). ...

Embodiment 2

[0038] Embodiment 2 will be described below. As sample 1, the raw materials were weighed at the mixing ratio shown in sample 3 in Table 1, and the metal mold was used in the same manner as in Example 1, at room temperature at 15 ton / cm 2 pressure forming to obtain a dust core in the shape of a spiral tube with an outer diameter of 20 mm, an inner diameter of 10 mm, and a thickness of 5 mm. Then, the dust core is subjected to heat treatment in nitrogen at 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, 1000°C, 1100°C for 2 hours in nitrogen, heat treatment of silicone resin and powder molding deformation removal.

[0039] This dust core was housed in a case made of an insulator, and was wound, and the DC superposition characteristic was measured with a 4284A precision instrument made by HP. image 3 Results are shown. In addition, the frequency characteristic of μ was measured with a 4194A impedance measuring instrument manufactured by HP. Figure 4 Results are shown. From ima...

Embodiment 3

[0043] Embodiment 3 will be described below. Using 5.0% by weight of Si, 0.5% by weight of O, and the rest being Fe alloy powder used in Sample 1 of Example 1, using metal molding to form a spiral tube with an outer diameter of 50 mm, an inner diameter of 25 mm, and a height of 20 mm. Powder cores. Then, the toroidal dust core was heat-treated for deformation correction, inserted into a 5mm gap at right angles to the magnetic circuit, and wound with 60 turns of a magnetic metal wire with an outer diameter of 1.8mm to manufacture a reactor.

[0044] The inductance of this reactor 40A at the time of direct current superposition was measured and found to be 550 μH. Next, this reactor was connected to a switching power supply equipped with a very common active filter for inverter control with an output power of 2000 W class, and the circuit efficiency was measured. Here, a load resistor is connected on the output side. In addition, the circuit efficiency uses the value obtained...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
core lossaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

A powder magnetic core prepared by the compression molding of a magnetic powder, wherein the magnetic powder is made of an alloy having a composition: Si: 1 to 10 wt%, O: 0.1 to 1.0 and balance; Fe, and the magnetic core comprises the above magnetic powder having a particle diameter of 150 mum or less and, caused to be present between particles constituting the powder, an insulator containing SiO2 and MgO as main components.

Description

technical field [0001] The present invention relates to a powder magnetic core used in a choke coil, and more specifically, to a powder magnetic core excellent in DC superposition characteristics and frequency characteristics. Background technique [0002] As choke coils used at high frequencies, ferrite cores or powder cores are used. Among them, the ferrite core has a disadvantage that the saturation magnetic flux density is small. In contrast, a dust core produced by molding metal powder has an advantage of being excellent in DC superposition because it has a higher saturation magnetic flux density than soft ferrite. [0003] However, powder magnetic cores are produced by mixing metal powder with an organic binder and compression-molding under high pressure. Therefore, insulation between powder particles cannot be ensured, and frequency characteristics of magnetic permeability are degraded. In addition, when a large amount of binder or the like is mixed in order to ensu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C38/02H01F1/147H01F1/24H01F1/26H01F1/33H01F3/08H01F3/14H01F17/04H01F27/255H01F37/00H01F41/02
CPCH01F1/1475H01F1/14766H01F1/24H01F1/26H01F1/33H01F3/08H01F3/14H01F17/04H01F37/00H01F41/0246
Inventor 藤原照彦石井政义斋藤义孝
Owner TOKIN CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap