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Magnetic property calculation method and magnetic property calculation device

A technology of characteristic calculation and magnetic force, applied in measurement devices, magnetic performance measurement, magnetic susceptibility measurement, etc., can solve problems such as the reduction of residual magnetic flux density

Active Publication Date: 2016-02-03
HITACHI METALS LTD
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Problems solved by technology

[0004] However, in the method of replacing Nd in Nd-Fe-B based sintered magnets with heavy rare earth elements, when the coercive force increases, the residual magnetic flux density still decreases

Method used

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  • Magnetic property calculation method and magnetic property calculation device
  • Magnetic property calculation method and magnetic property calculation device
  • Magnetic property calculation method and magnetic property calculation device

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Embodiment Construction

[0061] Hereinafter, the present invention will be specifically explained based on the drawings showing embodiments of the present invention.

[0062] In addition, in the following embodiment, the following example is described: according to the computer program of the present invention, the computer executes the magnetic characteristic calculation method and operates as a magnetic characteristic calculation device to calculate the heavy rare earth element dysprosium (hereinafter referred to as Dy) after diffusion The magnetic characteristics of Nd-Fe-B sintered magnets.

[0063] figure 1 It is a block diagram showing the structure of the magnetic force characteristic calculation device 1 in this embodiment. A personal computer is used in the magnetic force characteristic calculation device 1 of this embodiment. The magnetic characteristic calculation device 1 includes: an arithmetic unit 10, which controls the actions of each structural unit and performs calculations; a storage un...

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Abstract

A prestored database indicating a correspondence of δ (depth) / ΔHcJ (coercivity increment) and a prestored database indicating information of Dy diffusion condition (diffusion coefficient, diffusion flux and processing time regarding Dy diffusion) are used to compute distribution of Dy introduction amount in a magnet from shape information of the magnet and information of a Dy introduction face and compute distribution of ΔHcJ in the magnet from the distribution of Dy introduction amount. Regarding a magnet having a coercivity that is distributed non-uniformly, a J / H curve is computed using the computed distribution of ΔHcJ, and a demagnetizing factor at a predetermined temperature is computed using a temperature coefficient.

Description

Technical field [0001] The invention relates to a method for storing magnet information in advance and calculating the magnetic characteristics of the magnet through an arithmetic device. The present invention particularly relates to a magnetic characteristic calculation method, a magnetic characteristic calculation device, and a computer program capable of high-precision calculation of magnetic characteristics, especially demagnetization characteristics, within a magnet, wherein heavy rare earth elements such as dysprosium diffuse from the surface of the magnet Into the inside of the magnet. Background technique [0002] As a high-performance permanent magnet, Nd-Fe-B sintered magnets are used in a variety of devices, especially hard disk drives or various motors. [0003] Nd-Fe-B sintered magnets may reduce the residual magnetic flux density (demagnetization) when exposed to high-temperature exposure or demagnetization. This kind of demagnetization is divided into "reversible d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12H01F41/00H01F41/02
CPCG01R33/0064G01R33/0385G01R33/16H01F41/0293
Inventor 枣田充俊
Owner HITACHI METALS LTD
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