气隙对铁芯电感参数的影响分析

发布时间：2018-06-22 08:59

本文选题：磁场强度 + 气隙长度　；参考：《吉林大学》2017年硕士论文

【摘要】：近几年来,随着电工技术和电工设备的不断发展革新,越来越多的电气元件被应用在各大电网中,而电感线圈是最基本的元件,应用范围极其广泛。铁芯材料的高磁导率特性大大提高了线圈的利用效率,因此,大多数电感元件含铁芯。气隙可以在不改变铁芯电感最大磁场强度及矫顽力等基本特性的基础上,改变铁芯电感的饱和特性,提高电感线圈及铁芯的利用率,减小电感体积,降低成本。本文主要研究气隙长度、位置对铁芯电感参数的影响,为最优电感设计和参数计算提供参考。通过分析铁芯材料的基本特性,研究含不同长度气隙的铁芯电感的磁通分布以及气隙位置等对铁芯电感特性的影响,对比空芯电感和铁芯电感,利用ANSYS软件分别对空芯电感和铁芯电感进行三维仿真,改变励磁电流的大小,得到仿真数据和三维仿真图形,通过对图形的分析,得出气隙位置、长度对电感的变化的影响情况。以一种小型电感为例,用LCR测试仪对电感线圈参数进行仪器测量,用Matlab软件对实验数据进行曲线拟合,得到拟合公式和拟合误差。然后设计实验电路,以气隙长度作为主要的实验变量,对电感参数进行带电测量,把仪器测量结果与带电实验测量结果进行对比分析,进而对计算空芯和含气隙的铁芯的经验公式进行了修正,以带电测量的数据为准,对电感参数随气隙变化的趋势进行了分析和总结。最后在实验电路中串联开关K,控制开关K的开断得到阶跃响应信号,算出阶跃响应时间常数,对经验公式的修正系数进行进一步的验证。本文详细阐述了气隙对铁芯电感特性的影响,得出气隙的位置和长度会影响电感的变化率,并给出了计算空芯和含气隙的铁芯电感修正的经验公式,进一步提高了电感计算的准确性,对降低变压器损耗和提升电网安全稳定运行有着重大的指导意义。
[Abstract]:In recent years, with the continuous development and innovation of electrical technology and electrical equipment, more and more electrical components have been applied in various power grids, and inductance coil is the most basic component, which has a wide range of applications. The high permeability characteristics of the core material greatly improve the efficiency of the coil utilization, therefore, most of the inductance elements contain iron core. The air gap can change the saturation characteristic of the core inductor without changing the maximum magnetic field intensity and coercivity of the core inductor, improve the utilization ratio of the inductor coil and iron core, reduce the volume of the inductor and reduce the cost. The influence of air gap length and position on the parameters of the core inductor is studied in this paper, which provides a reference for the design and calculation of the optimum inductor. By analyzing the basic characteristics of the core material, the effects of flux distribution and air gap position on the core inductance characteristics of the core inductor with different length air gap are studied, and the comparison between the hollow core inductance and the iron core inductance is made. Using ANSYS software to simulate air core inductor and iron core inductor respectively, change the magnitude of excitation current, get the simulation data and 3D simulation figure, get the air gap position by analyzing the figure. The effect of length on the inductance. Taking a small inductor as an example, the parameters of inductor coil are measured with LCR tester, and the curve fitting of experimental data is carried out by Matlab software, and the fitting formula and fitting error are obtained. Then the experimental circuit is designed, the air gap length is taken as the main experimental variable, the inductance parameters are measured in charge, and the results of the instrument measurement and the live experiment are compared and analyzed. Furthermore, the empirical formula for calculating hollow core and iron core with air gap is modified, and the variation trend of inductance parameters with air gap is analyzed and summarized based on the data of live measurement. Finally, the step response signal is obtained by controlling the switch K in series switch K in the experimental circuit, and the step response time constant is calculated, and the correction coefficient of the empirical formula is further verified. In this paper, the influence of air gap on the inductance characteristics of iron core is discussed in detail. It is concluded that the position and length of air gap will affect the change rate of the inductor, and the empirical formula for calculating the correction of the inductance of the core and the iron core with air gap is given. The accuracy of inductance calculation is further improved, and it is of great significance to reduce transformer losses and enhance the safe and stable operation of power grid.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM55

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