共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
为了校正扭转波速度、补偿温度、抑制脉冲电流噪声以及提高输出信号的信噪比,设计了一种双检测线圈结构应用于磁致伸缩液位传感器。推导了扭转波速度与温度的数学模型,得到了扭转波速度随温度的变化趋势;分析了单检测线圈结构存在温度影响测量结果与脉冲电流幅值大等问题。通过理论分析,最终的实验结果表明,与单检测线圈结构相比,双检测线圈结构能够快速计算扭转波速度,补偿温度对测量结果的影响,将脉冲电流噪声信号幅值降低至原来的1/27,测量误差由原来的0.18 mm降低至0.02 mm。双检测线圈结构为磁致伸缩液位传感器优化设计提供了理论指导。 相似文献
3.
本文从物理定律出发,阐述了带磁芯脉冲大电流测量线圈的基本原理和设计方法,此测量法与传统的分流器法和空芯测量线圈(即Rogowski线圈)相比较,可以测量小脉冲电流,改善低频响应和简化工艺。本文介绍了设计的实验中使用的测量线圈及其特性。 相似文献
4.
5.
点火线圈的装配是点火线圈生产过程中的重要一环,而点火线圈装配技术在国内发展迟缓,装配设备落后,严重制约点火线圈的批量生产,影响了点火线圈的质量。因此,设计一套点火线圈装配设备,对提高点火线圈的质量和装配效率有着重大的现实意义。首先根据某型号汽车点火线圈中的初、次级线圈、壳体的特征和设计要求,提出了装配系统的方案并进行了结构设计。其次,对重要部件建立刚柔耦合模型,利用ADAMS参数化分析中的设计研究方法,对装配过程中装配机构的下压力进行动力学分析,得出最佳下压力数值。利用ANSYS中对线圈施加最优下压力时的动载荷进行应力应变分析,得出线圈的最大应力应变点,校核了线圈骨架的强度。 相似文献
6.
邓隐北 《中国制造业信息化》1993,(1)
这一设计是有关利用电磁力对管材等被加工毛坯材料进行加工的方法。右图所示为这一设计应用实例中的电磁成形装置纵断面图。将被加工毛坯材料放置在成形用模与产生电磁力的线圈之间,线圈通电以后(原文为“通过线圈放电”,拟误。译注),由该电磁力对被加工材料在成形金属模中进行表面的挤压加工。这种材料加工方法的特点是:由于磁通 相似文献
7.
Rogowski线圈具有结构简单,线性度良好、安装方便等优点.主要用在测量交流电流、脉冲电流、电力系统中的暂态电流等方面.本文简单分析了Rogowski的测量原理,并用集中参数模型,给出了自积分式Rosowski线圈参数的计算公式以及线圈的传递函数.通过仿真研究了自积分式Rogowski线圈的电磁参数对线圈频率特性的影响,以及自感、互感、分布电容和取样电阻变化时对自积分式Rogowski线圈频带宽度的影响,并为优化Rogowski线圈的设计提供了参考指数. 相似文献
8.
9.
10.
11.
12.
13.
Rogowski coils: theory and experimental results 总被引:1,自引:0,他引:1
The theory is given of the voltage output of a Rogowski coil excited by a current pulse flowing along the axis of the coil. In this theory the Rogowski coil is considered as a delay line. The results do not differ from those obtained usually by considering the coil as a voltage source dphi/dt with an inductive output impedance. Details are also given of the design of two Rogowski coils and their working modes are fully analyzed. 相似文献
14.
15.
A self-integrating Rogowski coil with magnetic core is investigated for accurate measurement of high-impulse current in this paper. Usually, the distributed parameters of Rogowski coil generate deleterious high-frequency resonant signal parasitizing in the useful signal of the coil circuit. Damping resistors can be used to eliminate the parasitic resonant component of the signal. In this paper, damping effects of the damping resistors on the output signal of Rogowski coil are studied in detail. According to circuit theory, approximate circuit equations of Rogowski coil with lumped parameters in simplification are put forward. Response signal of coil is analyzed and a reasonable method for choosing damping resistance is also presented. When the 50 Ω damping resistance is used, the amplitude of parasitic resonant signal has been damped by 5.7 times in contrast to the situation without any damping resistance. Result of Pspice circuit simulation corresponds to the theoretical calculation result. A standard 10 ns square pulse has been used to calibrate the coil signal before and after the damping resistors soldering on the coil, respectively. Experimental results show that the response time of the coil with magnetic core is 1.1 ns and the parasitic resonance in the coil signal is almost eliminated. The coil can accurately detect high-pulse current at kA range. 相似文献
16.
介绍了PCB型Rogowski线圈的工作原理及特点,详细分析并设计了该传感器的信号处理电路,对该线圈电流传感器进行了线性度和灵敏度测试,实验结果表明:该传感器测量时线性度好,准确度较高,能满足测量要求。 相似文献
17.
I. A. Metwally 《Instruments and Experimental Techniques》2016,59(2):250-257
This paper presents design, calibration and testing of a new tape-wound Rogowski coil for measuring large-magnitude pulsed currents. The performance of the coil is tested by different impulse current waveforms up to 9 kA peak value. The coil is calibrated versus two commercial impulse-current transformers with different impulse current waveforms. The coil design is optimized to work in the differentiating mode and achieve useful bandwidth and sensitivity up to 1 MHz and 102 mV/kA, respectively. Waveform distortion of the coil output voltage is examined by using the lumped-element model to optimize the parameters of the external passive integrator. It is desired to optimize the integrator parameters and achieve the desired bandwidth without having droop and backswing. To do so, the coil frequency response is investigated by making fast Fourier transform (FFT) of the impulse current waveforms and PSPICE simulation of the lumped parameter equivalent circuit of Rogowski coil and the external integrator. Finally, it is found that the PSPICE calculated sensitivity for the optimized integrator parameters deviates from the corresponding measured one by a percentage relative error of–0.05%. 相似文献
18.
A new method was designed for calibrating a Rogowski coil of fast time response. The method is based on the cable pulser method except that the voltage signal pick-off output was moved to a position with a distance l from the load. If 2l/v is longer than the time duration of the forward voltage pulse u(f)(t), the reflected voltage pulse u(r)(t) could be separated from u(f)(t) and directly measured. Using the formula i(t)=[u(f)(t)-u(r)(t)]/50 to calculate the primary current of the Rogowski coil, the coil could be more accurately calibrated. 相似文献
19.
提出了一种用于测量直流叠加脉冲电流波形的电流传感器。该传感器由两个磁芯组成,一个工作于磁通门状态,另一个基于罗氏线圈原理。为了将磁通门与罗氏线圈检测技术集成在一起,引入了一个反馈绕组,有效克服了脉冲磁场与直流磁场对磁芯工作状态的影响。基于理论分析制作了样机。实验结果表明,所提出的电流传感器能有效测量直流叠加脉冲电流波形:有效测量频带为340 k Hz,直流分量的测量误差为0.6%;低频段与高频段交点处的测量误差最大,最大测量误差为1.5%。 相似文献
20.
在分析电子式电流、电压互感器当前技术和发展的基础上,系统总结并提出了组合式电子互感器的原理和设计要求。给出了以Rogowski线圈测量电流和以电容分压器测量电压的电子式电流/电压互感器的原理和设计方法,论述了组合式电子互感器的优点和性能。 相似文献