Magnetostrictive member and method for manufacturing magnetostrictive member

The magnetostrictive member with longitudinal grooves and heat treatment stabilizes optimal magnetic field strength, addressing variations in device characteristics and enhancing productivity in power generation devices.

WO2025170035A1 Publication Date: 2025-08-14SUMITOMO METAL MINING CO LTD
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Patent Information

Application Number
PCT/JP2025/004118
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-02-08
Filing Date
2025-02-07
Publication Date
2025-08-14

AI Technical Summary

Technical Problem

Existing magnetostrictive vibration power generation devices face variations in optimal magnetic field strength and device characteristics due to inconsistencies in magnetostrictive properties, necessitating individual adjustments for each device, which reduces productivity.

Method used

A magnetostrictive member with grooves extending in the longitudinal direction and subjected to heat treatment, utilizing a stable half-value frequency coupling coefficient as an index to standardize optimal magnetic field strength, independent of size or thickness, ensuring high parallel magnetostriction and reduced variation.

Benefits of technology

The solution enables consistent device characteristics and reduced variation in optimal magnetic field strength, facilitating efficient power generation with improved productivity by using a stable index unaffected by member size or thickness.

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Abstract

[Problem] To provide a magnetostrictive member which uses a stable index that can be easily evaluated and is unaffected by the size and thickness of the magnetostrictive member in a device characteristic when a magnetostrictive vibration power generation device is manufactured, which produces a high device characteristic, and which suppresses variations in optimum magnetic field strength, and to provide a method for manufacturing the magnetostrictive member. [Solution] A plurality of magnetostrictive members are obtained from the same crystal. The magnetostrictive member comprises a crystal of an iron-based alloy having a magnetostrictive characteristic, and is a plate-shaped body having a longitudinal direction and a lateral direction. At least one surface of the front surface and the back surface of the plate-shaped body has a plurality of grooves extending in the longitudinal direction. The plurality of magnetostrictive members have, as the optimum magnetic field strength, magnetic field strength when a half-value frequency coupling coefficient (= kf1f2) obtained by electromechanical equivalent circuit analysis becomes maximum, and the ratio (standard deviation / average value) between the standard deviation of the optimum magnetic field strength and the average value of the optimum magnetic field strength is 0.2 or less.
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