Magnetic power, method for manufacturing moulding powder and moulding powder

A powder magnetic core and magnetic powder technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic cores/yokes, and the magnetism of inorganic materials, can solve problems such as the increase in the resistance value of powder magnetic cores, and achieve suppression of hysteresis loss and suppression Effect of eddy current loss and improvement of heat resistance

Inactive Publication Date: 2008-01-16
HITACHI LTD
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of powders such as generally used water atomized powders, the resistance value of the dust core does not increase like that of FeSi alloy powders.

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
  • Magnetic power, method for manufacturing moulding powder and moulding powder
  • Magnetic power, method for manufacturing moulding powder and moulding powder
  • Magnetic power, method for manufacturing moulding powder and moulding powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]

[0051] [powder]

[0052] As the spherical soft magnetic powder, a gas atomized powder composed of pure iron and having an average particle diameter of 100 μm was prepared.

[0053] [Preparation of treatment liquid for coating]

[0054] A treatment liquid for forming an insulating coating on the surface of the water-atomized powder was prepared in the following procedure.

[0055] (1) 4 g of salt with high solubility in water and Nd acetate were introduced into 100 mL of water, and completely dissolved using a vibrator or an ultrasonic stirrer.

[0056] (2) Press to generate NdF 3 Slowly add an equivalent of the chemical reaction diluted to 10% hydrogen fluoride acid.

[0057] (3) For NdF that generates gelatinous precipitates 3 The solution was stirred with an ultrasonic stirrer for more than 1 hour.

[0058] (4) After centrifugation at a rotational speed of 4000 to 6000 r.p.m, the supernatant was removed, and substantially the same amount of methanol was added...

Embodiment 2

[0079] A dust core was produced in the same manner as in Example 1. The difference from Example 1 is that as the powder of the magnetic powder, the water-atomized powder was pulverized by a ball mill, the surface was flattened, and the powder was classified so that the average particle diameter was 150 μm. In addition, the evaluation method of the dust core of Example 2 was performed by the same evaluation method as Example 1. Table 1 shows the results.

Embodiment 3

[0094] A dust core was produced in the same manner as in Example 1. The difference from Example 1 is that, as shown in FIG. 4 , as the soft magnetic powder, gas atomized powder classified by an average particle diameter of 50 μm to 200 μm was used, and NdF was carried out. 3 The layer formation treatment was performed by heat treatment at 600°C. In addition, the amount of powder used varies according to the size of the powder, so that NdF 3 The average thickness is consistent with 60 nm. Then, in the same manner as in Example 1, the coercive force of the dust core was measured. Figure 4 shows the results. In addition, the resistance value was also measured in the same manner as in Example 1. Figure 5 shows the results.

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 sizeaaaaaaaaaa
thicknessaaaaaaaaaa
densityaaaaaaaaaa
Login to view more

Abstract

A magnetic powder according to the present invention comprises powder made of the iron element as a main component, and an insulator covering the surface of the powder. The powder has a spherical shape or a smoothed surface. The insulator comprises rare earth fluorides, alkaline metal fluorides, or alkaline earth metal fluorides. A soft magnetic composite formed by using this magnetic powder can suppress its eddy current loss in a wide frequency band and can also suppress its hysteresis loss due to compressed residual distortion in soft magnetic powder.

Description

technical field [0001] The present invention relates to a powder magnetic core produced by compression-molding magnetic powder containing iron element, and more particularly to a powder magnetic core suitable for use in electric parts such as rotating electric machines. Background technique [0002] In recent years, electric vehicles have attracted attention from the viewpoint of the environment. Such an electric vehicle is equipped with a rotating electric machine (electric machine) as a power source, and the magnetic core (powder core) constituting the rotating electric machine has a large influence on the efficiency of the rotating electric machine. Therefore, low iron loss and high magnetic flux density are required. In addition, these magnetic properties are required not to degrade even in the region from low frequency to high frequency. [0003] Such iron loss can be obtained by using the eddy current loss (We) which is closely related to the specific resistance of th...

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): H01F1/08H01F3/08H01F41/02B22F1/16
CPCH01F1/24B22F2998/10H01F41/0246B22F1/02Y10T428/12014Y10T428/12181B22F1/16B22F9/24B22F9/04B22F9/082
Inventor 今川尊雄佐通祐一小室又洋
Owner HITACHI LTD
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