Distributed Magnetic Flux Density on the Cross-Section of a Transformer Core

Li, Lingzhi; Du, Xuhao; Pan, Jie; Keating, Adrian; Matthews, David; Huang, Hai; Zheng, Jing

doi:10.3390/electronics8030297

Cited by 8 publications

(9 citation statements)

References 22 publications

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“…When the magnet is held stationary inside the loop, there is no current in the loop. Based on his observations, Faraday concluded that the induced current is related to the changing magnetic field [7].…”

Section: Faraday's Lawmentioning

confidence: 99%

See 1 more Smart Citation

Computational Numerical Analysis of a Magnetic Flux Permanent Magnet with Different Shape for The Development of a Hybrid Generator

Bahari¹,

Firdaus²,

Mohamed³

et al. 2023

JMechE

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A hybrid generator is one of the attempts to reduce carbon emissions in electricity generation, as it could replace the combustion system currently used in generator sets to generate electricity while increasing carbon emissions. In the hybrid generator system, Lenz's rule of electromagnetic induction is applied in reverse by using a relay to change the polarity of the solenoid coil's electric current. The permanent magnet in the solenoid coil generates mechanical energy (motion) and thereby moves the generator engine, since the permanent magnet is connected to the generator engine via the crankshaft. The objective of this study is to determine and compare the behaviour of N55, N52, N42, N42SH, and samarium-cobalt permanent magnets for the magnet system. The objective of this study is also to find a suitable permanent magnet for use in the magnet system to increase the power generation efficiency. A simple model is simulated to achieve the desired result, including magnetic flux density inside and around the magnets, magnetic field strength calculation, and applied force. The simulations and analysis are performed using ANSYS R19 software and finally all the data are recorded and compared to select the best magnet and develop a prototype. The permanent magnet inside the solenoid plays an important role in the hybrid generator and it is crucial to choose the suitable permanent magnet to increase the efficiency of power generation. From the data, Alliance N-55 permanent magnet has the highestmagnetic force of 131.57 N for 1 mm because it has significantly higher magnetic flux density, magnetic flux intensity and magnetic force.

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Section: Faraday's Lawmentioning

confidence: 99%

“…The focus of Lenz's law is the direction of the current induced in a circuit by the effect of a magnetic field. According to Lenz's law, the current generated in the coil counteracts the flux change caused by the moving magnet [7]. The mechanical linkage produces linear movement in the solenoid by reversing the Lenz Law.…”

Section: Lenz's Lawmentioning

confidence: 99%

Computational Numerical Analysis of a Magnetic Flux Permanent Magnet with Different Shape for The Development of a Hybrid Generator

Bahari¹,

Firdaus²,

Mohamed³

et al. 2023

JMechE

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show abstract

“…Additionally, the distribution function of the leakage flux will change in correspondence with any winding structural changes as well as the vibration response function of the winding. As a result, the distributed vibration on the winding strongly depends on the mechanical properties of the winding [18].…”

Section: Vibration Transmission Pathsmentioning

confidence: 99%

Experimental Research on Power Transformer Vibration Distribution under Different Winding Defect Conditions

Zheng

Huang

2019

Electronics

Self Cite

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Vibration analysis is one of the important tools for the transformer winding faults diagnosis. Previous researchers have proved that the vibration spatial distribution of the winding is significantly influenced by the winding defects for the open circuit condition. In order to study the effects of the loading current on the winding vibrations under different mechanical conditions, experiments were designed and operated on a three-phase transformer winding to analyze the winding vibration distribution under different winding defect cases. Further, to study to what extent the mechanical defects and the loading current influence characteristics of the vibration distribution on the tank, the tank vibration distribution under various winding defects and different loading currents were also measured and discussed. In addition, the possibility of detection of transformer winding faults based on tank vibration spatial distribution characteristics was also discussed.

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“…3 The attractive force of the magnetic attachments is proportional to the square of magnetic flux density and it is optimized by the magnetic circuit. 17,18 However, the magnetic flux of the dental magnets were 0.01-0.03 T with the keeper, and the amount of magnetic flux beyond the abutment tooth was only 0.005 T which is much lower than the magnetic field of TMS. 19 Though the open circuit has extended magnetic flux lines with decreased magnetic flux density, while the close circuit has closer magnetic flux lines with increased magnetic flux density, 20 the magnetic field from dental magnets is lower than that of TMS.…”

Section: Introductionmentioning

confidence: 96%

Influence of dental magnets on human brain activity: A quantitative EEG analysis

Elias

Raza

Vaidyanathan

et al. 2021

Special Care in Dentistry

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The magnetic field is known to attenuate mental depression, but it is not clear on the effect of dental magnets on human brain activity. Therefore, this study was to determine the influence of magnetic field from intraoral magnets on the human brain activity by analyzing the changes in alpha waves.Materials and Methods: Twenty complete denture male patients aged between 50 and 60 years were included after their consent. The neodymium-iron-boron sintered magnet was incorporated into the existing mandibular denture bilaterally in canine region. The participants were subjected to electroencephalogram (EEG) and the output measured alpha waves at three phases: (i) without placement of magnets (WM0), (ii) 30 days post-magnet placement in the mandibular denture (WM), and (iii) after 6 months post-removal of magnets (WM6). The data obtained was skewed (non-parametric), and hence multivariate analysis using Friedman test, and bivariate analysis using Wilcoxon signed rank test and Mann-Whitney test were done to assess the significant difference among the groups. Results: The comparison of alpha waves between different phases showed a significant difference in all the pairs (p < .05) except WM-WM6. Comparison of alpha waves between right and left hemisphere showed no statistically significant difference (p > .05). Conclusion:We concluded that dental magnets had an influential effect on the alpha waves in the brain on both the left and right hemispheres. The removal of dental magnets retained the changes in brain activity even after 6 months of removal, denoting the alternative therapy to management of mental depression.

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Distributed Magnetic Flux Density on the Cross-Section of a Transformer Core

Cited by 8 publications

References 22 publications

Computational Numerical Analysis of a Magnetic Flux Permanent Magnet with Different Shape for The Development of a Hybrid Generator

Computational Numerical Analysis of a Magnetic Flux Permanent Magnet with Different Shape for The Development of a Hybrid Generator

Experimental Research on Power Transformer Vibration Distribution under Different Winding Defect Conditions

Influence of dental magnets on human brain activity: A quantitative EEG analysis

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