数控中频标准强磁场源的设计
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摘要
随着科学技术的进步,中频强磁场应用越来越广,比如在医学中的感应肿瘤热疗、高频电刀、感应加热、电磁干扰以及科学实验等检测。但中频标准强磁的检测还是一个难题,中频标准强磁场源作为中频强磁场检测设备的标定基础,显得十分重要,目前国内外在中频标准强磁场源方面研究很少,导致中频强磁场检测设备研发的落后。本课题来源于国家自然基金项目中的磁场检测设备的研发,根据磁场测量传感器和仪器标定要求,研究数控中频标准磁场源,设计标准的稳定均匀交变磁场。
论文分析国内外对中频标准强磁场源的的发展现状及研究情况,根据目前需要的磁场频率和强度的范围,中频标准强磁场源包含中频电路和磁场线圈两部分：磁场发生装置电路使用半桥逆变拓扑结构,串联谐振的连接方式,逆变器控制部分主要使用锁相环及其外围电路控制,输出稳定、波形规则的电流。使用Helmholtz线圈作为标准磁场源的输出设备,根据需要的磁感应强度,设计了所需Helmholtz线圈。介绍了轴对称线圈磁场的理论基础,通过最简单的轴对称圆环线圈的磁场分布,进而对Helmholtz线圈的磁场进行建模分析,计算Helmholtz线圈中心轴线上的磁感应强度,这些理论的分析,不仅对本课题而且对后续研究都有一定意义。最后使用Mathmatic和HFSS仿真软件对线圈的磁感应强度、均匀度以及均匀区形状进行分析和仿真。并使用磁场测量仪进行测试,和计算结果进行比较、计算误差并进行误差分析。
本课题对中频标准强磁场源的作了一些初步的实验,使用磁场测试仪对Helmholtz线圈进行测试,分析理论与实际测试误差,对线圈磁场的均匀度以及均匀区的形状进行仿真分析,达到初步的预期结果。结果说明中频标准强磁场源可对中频强磁场传感器进行标定,另外本课题关于产生空间分布稳定的磁场等方面的研究,为其他中频强磁场设备提供借鉴方法。
With the development of scientific technology, the application of intermediate frequency strong magnetic field are used more and more widely, For instance testing in the induction heat treatment to medical tumor, high-frequency electrotome and induction heating, electromagnetic interference and scientific experiment and so on, But intermediate frequency standard strong magnetic testing is still a problem. Intermediate frequency standard strong magnetic field source viewed as intermediate frequency magnetic field testing equipment calibration foundation, is very important. Research in intermediate frequency standards and strong magnetic field sources is rare at home and abroad, leading to the lag behind intermediate frequency strong magnetic field detection equipment research and development. This topic is from the magnetic field project detection equipment research and development of national natural science foundation. According to the requirement of magnetic sensor and Instrument calibration, researching the intermediate frequency standard magnetic field numerical in control source, designing uniform standard stable alternating magnetic field.
This paper analyzes the development situation and research of the intermediate frequency standards strong magnetic field source at home and abroad. According to the current need of the magnetic field frequency and the scope of strength, intermediate frequency standard strong magnetic field source contains intermediate frequency circuit and magnetic coil. Magnetic field generator circuit is mainly used in half-bridge converter topology structure, the connection mode of network. Inverter control part mainly use phase locked loop and peripheral control circuits, stable output waveform, and the current rules. Though need in the output of the magnetic flux density, design specifications of the Helmholtz coils. Getting through the magnetic field distribution of the most simple axisymmetric circle coils, analysis magnetic field of the Helmholtz coil, calculating the intensity of Helmholtz coil center axis of the magnetic field, the analysis of the theory has certain significance not only for this project, but also for subsequent research. Finally using Mathmatic and HFSS simulation software to analyze and simulate the magnetic induction strength of coil. evenness and homogeneity shape, and using magnetic field measuring instrument to test, then comparing the results, calculating error and analyzing error.
This topic made some preliminary experiments on the source of strong magnetic field of the IF standard. Using Helmholtz coil tester of magnetic field to test, analyzing the theory and practical test error. to the homogeneous degree of the magnetic field coil and the shape of the homogeneity of simulation analysis, reach preliminary expected results. The results can explain that intermediate frequency standard strong magnetic field source can provided the basis of equipment accuracy in the existing many magnetic induction, And to the magnetic field sensors for calibration. In addition, the subject about the research of the magnetic field generated the space distribution stability, provides a better method for other magnetic induction equipment.
论文分析国内外对中频标准强磁场源的的发展现状及研究情况,根据目前需要的磁场频率和强度的范围,中频标准强磁场源包含中频电路和磁场线圈两部分：磁场发生装置电路使用半桥逆变拓扑结构,串联谐振的连接方式,逆变器控制部分主要使用锁相环及其外围电路控制,输出稳定、波形规则的电流。使用Helmholtz线圈作为标准磁场源的输出设备,根据需要的磁感应强度,设计了所需Helmholtz线圈。介绍了轴对称线圈磁场的理论基础,通过最简单的轴对称圆环线圈的磁场分布,进而对Helmholtz线圈的磁场进行建模分析,计算Helmholtz线圈中心轴线上的磁感应强度,这些理论的分析,不仅对本课题而且对后续研究都有一定意义。最后使用Mathmatic和HFSS仿真软件对线圈的磁感应强度、均匀度以及均匀区形状进行分析和仿真。并使用磁场测量仪进行测试,和计算结果进行比较、计算误差并进行误差分析。
本课题对中频标准强磁场源的作了一些初步的实验,使用磁场测试仪对Helmholtz线圈进行测试,分析理论与实际测试误差,对线圈磁场的均匀度以及均匀区的形状进行仿真分析,达到初步的预期结果。结果说明中频标准强磁场源可对中频强磁场传感器进行标定,另外本课题关于产生空间分布稳定的磁场等方面的研究,为其他中频强磁场设备提供借鉴方法。
With the development of scientific technology, the application of intermediate frequency strong magnetic field are used more and more widely, For instance testing in the induction heat treatment to medical tumor, high-frequency electrotome and induction heating, electromagnetic interference and scientific experiment and so on, But intermediate frequency standard strong magnetic testing is still a problem. Intermediate frequency standard strong magnetic field source viewed as intermediate frequency magnetic field testing equipment calibration foundation, is very important. Research in intermediate frequency standards and strong magnetic field sources is rare at home and abroad, leading to the lag behind intermediate frequency strong magnetic field detection equipment research and development. This topic is from the magnetic field project detection equipment research and development of national natural science foundation. According to the requirement of magnetic sensor and Instrument calibration, researching the intermediate frequency standard magnetic field numerical in control source, designing uniform standard stable alternating magnetic field.
This paper analyzes the development situation and research of the intermediate frequency standards strong magnetic field source at home and abroad. According to the current need of the magnetic field frequency and the scope of strength, intermediate frequency standard strong magnetic field source contains intermediate frequency circuit and magnetic coil. Magnetic field generator circuit is mainly used in half-bridge converter topology structure, the connection mode of network. Inverter control part mainly use phase locked loop and peripheral control circuits, stable output waveform, and the current rules. Though need in the output of the magnetic flux density, design specifications of the Helmholtz coils. Getting through the magnetic field distribution of the most simple axisymmetric circle coils, analysis magnetic field of the Helmholtz coil, calculating the intensity of Helmholtz coil center axis of the magnetic field, the analysis of the theory has certain significance not only for this project, but also for subsequent research. Finally using Mathmatic and HFSS simulation software to analyze and simulate the magnetic induction strength of coil. evenness and homogeneity shape, and using magnetic field measuring instrument to test, then comparing the results, calculating error and analyzing error.
This topic made some preliminary experiments on the source of strong magnetic field of the IF standard. Using Helmholtz coil tester of magnetic field to test, analyzing the theory and practical test error. to the homogeneous degree of the magnetic field coil and the shape of the homogeneity of simulation analysis, reach preliminary expected results. The results can explain that intermediate frequency standard strong magnetic field source can provided the basis of equipment accuracy in the existing many magnetic induction, And to the magnetic field sensors for calibration. In addition, the subject about the research of the magnetic field generated the space distribution stability, provides a better method for other magnetic induction equipment.
引文
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[20]王益民,靳世久,李连种等.磁生物效应研究中圆片永磁磁源空间磁感强度的计算方法[J].中国医学物理学杂志,2000.17(4)：249-250.
[21]席晓莉,文峻,王丽等.低频脉冲磁场发生仪的研制及其生物效应研究[J].西安理工大学学报,2001.17(3)：278-282.
[22]赵建亭,贺青,鲁云峰,李正坤.离散电流对精密线圈磁场影响的研究[J].仪器仪表学报,2009,4(30)：756-759.
[23]李泉风.电磁场数值计算与电磁铁设计[M].北京：清华大学出版社,2002：175-176.
[24]周耀忠,唐申生.任意形状通电线圈磁场的计算[J].海军工程大学学报.2009.,3(21)：71-74.
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