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Compacted magnetic core, production method of the same, and motor for electric vehicle

A manufacturing method and technology of magnetic cores, which are used in the manufacture of inductors/transformers/magnets, circuits, electrical components, etc., can solve the problems of Mg powder coating, insufficient resistance value, time-consuming, etc., and achieve high heat resistance. The effect of high resistance

Inactive Publication Date: 2008-12-17
HITACHI LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using NdF as a representative fluoride 3 , studies have been carried out on powders suitable for water atomization, but even with the addition of NdF 3 Thickness, resistance value are not enough
[0015] In the above-mentioned method cited in Document 3, it is necessary to oxidize the iron powder in advance, which takes time. In addition, it is difficult to evenly coat the Mg powder on the surface of the iron powder, which has disadvantages in practicability.

Method used

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  • Compacted magnetic core, production method of the same, and motor for electric vehicle
  • Compacted magnetic core, production method of the same, and motor for electric vehicle
  • Compacted magnetic core, production method of the same, and motor for electric vehicle

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Use gas atomized iron powder with a particle size of 100μm.

[0059] Compared with iron powder, 30nm MgF is formed 2 Coating film, measuring specific resistance and ring.

[0060] The specific resistance is 50μΩ·m. According to the ring measurement, the saturation magnetic flux density B is 1.76T and the loss is 37W / kg. Also, NdF with the same film thickness 3 The loss in the coating film is 80W / kg.

Embodiment 2

[0062] As the soft magnetic powder, water atomized iron powder with a diameter of 70μm is used, and it is processed by a ball mill together with SUS balls. The iron powder protrusions were removed by a 30-minute treatment.

[0063] Compared with iron powder, 50nm MgF is formed 2 Coating film, measuring specific resistance and ring.

[0064] The specific resistance is 70μΩ·m. According to the ring measurement, the saturation magnetic flux density B is 1.75T, and the loss is 45W / kg.

Embodiment 3

[0066] Reduced iron powder with an average particle size of 120 μm is used.

[0067] Compared with iron powder, it forms 100nm MgF 2 Coating film, measuring specific resistance and ring.

[0068] The specific resistance is 250 μΩ·m. According to the ring measurement, the saturation magnetic flux density B is 1.7T and the loss is 47W / kg.

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Abstract

The invention aims to provide a necessary production condition for coating, compacted magnetic core having higher resistance and higher magnetic flux density compared with prior magnetic core. A manufacturing method of a magnetic core includes a first step of applying a treatment liquid for forming an insulating film to iron powder; a second step of heat-treating the iron powder to which the treatment liquid has been applied, at a temperature higher than 350 degrees; a third step of compacting the heat-treated iron powder to form a magnetic core; and a forth step of heat-treating the magnetic core at a temperature ranging from 600 degrees to 800 degrees.

Description

Technical field [0001] The present invention relates to a powder magnetic core manufactured by compression molding magnetic powder containing an iron element, and particularly relates to a powder magnetic core used for motor parts such as rotary motors and reactors. Background technique [0002] In recent years, from the viewpoint of environmental protection issues, electric vehicles have received attention. As a power source for such electric vehicles, a rotary electric machine (electric motor) is provided, and a smoothing transformer (reactor) is provided in the output of the inverter circuit, and the efficiency of these components is improved. For this reason, as magnetic cores used in rotary motors and smoothing transformers, high specific resistance and high magnetic flux density are required. [0003] As a technique for increasing the resistance of the magnetic core, the following Patent Documents 1-3 can be cited. [0004] The following Patent Documents 1 and 2 describe th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F41/02B22F1/02B22F3/00C22C38/00B22F1/16
CPCB22F2003/248B22F2998/10C22C33/0228C22C2202/02H01F1/24H01F41/0246B22F1/16
Inventor 今川尊雄佐通祐一小室又洋铃木启幸
Owner HITACHI LTD
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