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Magnetism characteristics calculation method, magnetism characteristics calculation device, and computer program

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: 2014-03-05
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

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  • Magnetism characteristics calculation method, magnetism characteristics calculation device, and computer program
  • Magnetism characteristics calculation method, magnetism characteristics calculation device, and computer program
  • Magnetism characteristics calculation method, magnetism characteristics calculation device, and computer program

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Embodiment Construction

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

[0062] In addition, in the following embodiments, the following example is described: According to the computer program of the present invention, the computer executes the magnetic property calculation method, operates as a magnetic property calculation device, and calculates the diffusion rate of the heavy rare earth element dysprosium (hereinafter referred to as Dy). Magnetic properties of Nd-Fe-B sintered magnets.

[0063] figure 1 It is a block diagram showing the configuration of the magnetic characteristic calculation device 1 in this embodiment. A personal computer is used in the magnetic force characteristic calculation device 1 of the present embodiment. The magnetic characteristic calculation device 1 comprises: computing unit 10, controls the action of each structural unit and performs calculation; Storage unit 11, stor...

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Abstract

Using a database indicating correspondence between d (depth) and -HcJ (amount of increase in coercivity) stored in advance and a database indicating information on Dy diffusion conditions (diffusion coefficient, diffusion flux and processing time for Dy diffusion), the distribution of the amount of Dy introduced into a magnet is calculated from information about the shape of the magnet and information about a Dy introduction surface, and the distribution of HcJ in the magnet is calculated from the distribution of the amount of introduced Dy. For magnets having a distribution in which coercivity is not homogeneous, the calculated HcJ distribution is used to calculate a J-H curve, and the demagnetizing factor at a predetermined temperature is calculated using a temperature coefficient.

Description

technical field [0001] The invention relates to a method for storing magnet information in advance and calculating the magnetic force characteristics of the magnet through a computing device. In particular, the present invention relates to a magnetic property calculation method, a magnetic property calculation device, and a computer program capable of performing high-precision calculation of the magnetic property inside a magnet, wherein heavy rare earth elements such as dysprosium are diffused from the surface of the magnet into the interior of the magnet. Background technique [0002] As high-performance permanent magnets, Nd-Fe-B type sintered magnets are used in various devices, especially hard disk drives or various motors. [0003] When Nd-Fe-B type sintered magnets are exposed to high temperature or demagnetized, the residual magnetic flux density may decrease (demagnetized). This type of demagnetization is divided into "reversible demagnetization" that recovers whe...

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Application Information

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