Improvement of the power generation efficiency of magnetostrictive vibration generators using multiple magnetic circuits

Jie Zhang; Toshiyuki Ueno; Shota Kita

doi:10.1117/12.3008943

9 May 2024 Improvement of the power generation efficiency of magnetostrictive vibration generators using multiple magnetic circuits

Jie Zhang, Toshiyuki Ueno, Shota Kita

Author Affiliations +

Proceedings Volume 12947, Behavior and Mechanics of Multifunctional Materials XVIII; 129470D (2024) https://doi.org/10.1117/12.3008943
Event: SPIE Smart Structures + Nondestructive Evaluation, 2024, Long Beach, California, United States

Abstract

Vibration power generation harnesses weak environmental vibrations and converts them into electrical energy. In this study, a vibration power generator based on a magnetostrictive material (Fe-Ga) was investigated. The generator was designed with a cantilever beam structure, offering advantages in simplicity, robustness, and high-power generation capacity compared with piezoelectric systems. The change in magnetic flux within the coil is attributed to two factors: the change in the magnetoresistance of the magnetostrictive material owing to applied stress, and the variation in air-gap reluctance caused by fluctuations in the air-gap length. In our previous research, we focused on air-gap magnetoresistance variation and proposed a vibro-generator with a narrower air gap. Modifying the air-gap structure increased the generator’s air-gap magnetoresistance variation at the same amplitude, enhancing power generation. In this study, we introduced an auxiliary magnetic circuit to a narrow-gap-type vibration power generator. The main and auxiliary magnetic circuits had opposing flux directions and trends, which maximized the change in flux in the coil. Based on the study’s experimental results, the maximum output power generated by the multiple magnetic circuit vibro-generator was 149% and 46.3% higher than that of conventional vibro-generators and narrow-gap-type vibration generators, respectively. The multiple magnetic-circuit structure can enhance the power generation efficiency of the vibration generator, thereby increasing the application potential of the equipment.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jie Zhang, Toshiyuki Ueno, and Shota Kita "Improvement of the power generation efficiency of magnetostrictive vibration generators using multiple magnetic circuits", Proc. SPIE 12947, Behavior and Mechanics of Multifunctional Materials XVIII, 129470D (9 May 2024); https://doi.org/10.1117/12.3008943

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available