Levitation Characteristics Analysis of a Diamagnetically Stabilized Levitation Structure

Cheng, S; Li, Xia; Wang, Yongkun; Su, Yufeng

doi:10.3390/mi12080982

Cited by 14 publications

(5 citation statements)

References 25 publications

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“…Compared with the old structure [ 28 ], the push–pull diamagnetic levitation structure only introduces a pulling magnet, but has the advantages of multiple levitation equilibrium points, multiple maximum monostable levitation spaces, a large increase in horizontal recovery force, and more stable axial force distribution. The airflow energy harvester with the push–pull diamagnetic levitation structure has better output performance and a wider application range.…”

Section: Theoretical Analysismentioning

confidence: 99%

Improvement of the Airflow Energy Harvester Based on the New Diamagnetic Levitation Structure

et al. 2023

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This paper presents an improved solution for the airflow energy harvester based on the push–pull diamagnetic levitation structure. A four-notch rotor is adopted to eliminate the offset of the floating rotor and substantially increase the energy conversion rate. The new rotor is a centrally symmetrical-shaped magnet, which ensures that it is not subjected to cyclically varying unbalanced radial forces, thus avoiding the rotor’s offset. Considering the output voltage and power of several types of rotors, the four-notch rotor was found to be optimal. Furthermore, with the four-notch rotor, the overall average increase in axial magnetic spring stiffness is 9.666% and the average increase in maximum monostable levitation space is 1.67%, but the horizontal recovery force is reduced by 3.97%. The experimental results show that at an airflow rate of 3000 sccm, the peak voltage and rotation speed of the four-notch rotor are 2.709 V and 21,367 rpm, respectively, which are 40.80% and 5.99% higher compared to the three-notch rotor. The experimental results were consistent with the analytical simulation. Based on the improvement, the energy conversion factor of the airflow energy harvester increased to 0.127 mV/rpm, the output power increased to 138.47 mW and the energy conversion rate increased to 58.14%, while the trend of the levitation characteristics also matched the simulation results. In summary, the solution proposed in this paper significantly improves the performance of the airflow energy harvester.

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Section: Theoretical Analysismentioning

confidence: 99%

Improvement of the Airflow Energy Harvester Based on the New Diamagnetic Levitation Structure

et al. 2023

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“…The DSMLG is based on the stable levitation properties of a structure developed [ 62 ] through the investigation of the levitation properties of the floating magnet within a diamagnetically stabilized levitation system. The floating magnet in the diamagnetically stabilized levitation structure exhibits three distinct levitation states—symmetric monostable levitation, bistable levitation, and asymmetric monostable levitation—with our main focus on the symmetric monostable levitation mode [ 63 ]. This study presents the results of simulations to explore the levitation characteristics of the structure, and in particular, the effect of adjusting the gap between diamagnets and magnets on the resulting magnetic spring Hooke’s Law constant.…”

Section: Introductionmentioning

confidence: 99%

Modeling Development of a Diamagnetically Stabilized Magnetically Levitated Gravimeter

Rafiq,

Joseph,

Yokochi

et al. 2024

Sensors

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The aim of this work is to create a new type of gravimeter that can function effectively in the challenging conditions of space, specifically on the surfaces of planets and moons. The proposed device, called a diamagnetically stabilized magnetically levitated gravimeter (DSMLG), uses magnetic forces to balance a test mass against the force of gravity, allowing for accurate measurements. A diamagnetically stabilized levitation structure comprises a floating magnet, diamagnetic material, and a lifting magnet. The floating magnet levitates between two diamagnetic plates without the need for external energy input due to the interaction between the magnetic forces of the floating magnet and the stabilizing force of the diamagnetic material. This structure allows for stable levitation of the floating magnet without requiring additional energy. The goal is to design a gravimeter that is lightweight, requires minimal power, can withstand extreme temperatures and shocks, and has a low data rate. The authors envision this gravimeter being used on various robotic spacecraft, such as landers and rovers, to study the interiors of rocky and icy celestial bodies. This paper reports on the results of a finite element model analysis of the DSMLG and the strength of the resulting diamagnetic spring. The findings contribute to the understanding of the levitation characteristics of diamagnetically stabilized structures and provide valuable insights for their practical applications, including in the development of the proposed DSMLG.

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“…Zhang et al (27) reported a low-frequency wideband piecewise linear EVEH based on the diamagnetic levitation mechanism, in which a floating magnet impacts an elastic film at the edge under low-frequency horizontal vibration excitation. Cheng et al (28) designed a monostable diamagnetic levitation EVEH using the Taguchi method, which generated an RMS voltage of 250.69 mV and a power of 86.8 μW under 2.6 Hz vibration excitation.…”

Section: Introductionmentioning

confidence: 99%

Diamagnetic-levitation-based Electromagnetic Energy Harvester for Ultralow-frequency Vibrations and Human Motions

Zhang¹,

Zhang²,

Feng³

et al. 2023

Sensors and Materials

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Converting ambient vibration energy into electrical energy is a potential technology for powering wireless sensor networks (WSNs). In this paper, an electromagnetic vibration energy harvester (EVEH) based on a diamagnetic levitation system is proposed for harvesting energy from ultralow-frequency, broadband vibration sources. In this design, a diamagnetic levitation structure is utilized to reduce the operating frequency, and mechanical impact is effectively introduced to broaden the working bandwidth. A simulation model of the energy harvester is built to illustrate the energy conversion process. The performance of the energy harvester is experimentally investigated under harmonic excitation with different acceleration levels and frequencies. At an acceleration of 1 g, a maximum peak-to-peak voltage of 370 mV is measured over a wide frequency range of 3-16 Hz, and the root mean square (RMS) output power at the optimal resistance is obtained as 26.7 μW at the excitation frequency of 6 Hz. In addition, the real-time characteristic of the proposed energy harvester is explored by harvesting energy from human motions such as hand shaking, stepping, and jumping. Compared with recent diamagnetic-levitation-based vibration energy harvesters, the harvester can be efficiently operated in an ultralow-frequency, random, and large-amplitude-vibration environment.

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Levitation Characteristics Analysis of a Diamagnetically Stabilized Levitation Structure

Cited by 14 publications

References 25 publications

Improvement of the Airflow Energy Harvester Based on the New Diamagnetic Levitation Structure

Improvement of the Airflow Energy Harvester Based on the New Diamagnetic Levitation Structure

Modeling Development of a Diamagnetically Stabilized Magnetically Levitated Gravimeter

Diamagnetic-levitation-based Electromagnetic Energy Harvester for Ultralow-frequency Vibrations and Human Motions

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