Least Square Method-Based Unified General Design of Magnetic Field and Current Patterns for Improved Synthesized Magnetic Focusing (SMF)

IF 5.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Hyo J. Park;Syed Ahson Ali Shah;Ye R. Kim;Seog Y. Jeong;Chun T. Rim
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Abstract

A focused magnetic field is highly needed in medical applications such as transcranial magnetic stimulation (TMS) and implantable wireless power transfer (WPT). An optimum current pattern (CP) design of coaxial coils by appropriate selection of magnetic field pattern (MP) for synthesized magnetic focusing (SMF) is widely explored in this article. Using SMF equations, the CP of multiple coils (n) can be determined for any desired MP in theory. The magnitude of coil currents, however, could be extraordinarily large if inappropriate MP is sought. Furthermore, the MP for a few specific focal points (m) only could be controlled by the SMF theory; this means that the magnetic field for other points could not be controlled as wanted and could be arbitrary ( $m\le n$ ). The least square method is, therefore, first adopted in the SMF design for the case MP has a larger number of focal points than CP ( $n~\lt m$ ). Therefore, the number of focal points of MP m becomes arbitrary regardless of n due to the proposed unified general SMF design. The relationship between MP and CP for the innovative coaxial coils is specifically examined for the step, trapezoidal, and cosine-exponential MP cases. It is found that the smoother MP gives rise to a better CP with a minimum magnitude of currents and a minimum number of coils. Experiments for the cosine-exponential MP with three coils at the switching frequencies of $35\sim 75$ kHz show very good agreements with the simulation.
基于最小二乘法的改进型合成磁聚焦磁场和电流模式统一通用设计
聚焦磁场在经颅磁刺激(TMS)和植入式无线电力传输(WPT)等医疗应用中是非常需要的。本文对合成磁聚焦(SMF)中合理选择磁场模式(MP)来设计同轴线圈的最佳电流模式(CP)进行了广泛的探讨。从理论上讲,利用SMF方程,可以确定任意期望MP的多线圈的CP (n)。然而,如果寻求不合适的MP,线圈电流的大小可能会非常大。此外,只有少数特定焦点(m)的MP可以由SMF理论控制;这意味着其他点的磁场不能按需要控制,可能是任意的($m\le n$)。因此,在SMF设计中首先采用了最小二乘法,以满足MP比CP具有更多焦点的情况($n~\lt m$)。因此,由于提出了统一的通用SMF设计,MP m的焦点数量变得任意,而与n无关。在阶跃式、梯形和余弦指数型共轴线圈的情况下,对创新的共轴线圈的MP和CP之间的关系进行了专门的研究。结果表明,在电流大小最小、线圈数量最少的情况下,更平滑的MP产生了更好的CP。在$35\sim 75$ kHz的开关频率下,对三线圈余弦指数mps进行了实验,结果与仿真结果吻合得很好。
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来源期刊
IEEE Transactions on Instrumentation and Measurement
IEEE Transactions on Instrumentation and Measurement 工程技术-工程:电子与电气
CiteScore
9.00
自引率
23.20%
发文量
1294
审稿时长
3.9 months
期刊介绍: Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications. The scope of these papers may encompass: (1) theory, methodology, and practice of measurement; (2) design, development and evaluation of instrumentation and measurement systems and components used in generating, acquiring, conditioning and processing signals; (3) analysis, representation, display, and preservation of the information obtained from a set of measurements; and (4) scientific and technical support to establishment and maintenance of technical standards in the field of Instrumentation and Measurement.
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