Mechanical Engineering Department, Boston University, Boston, Massachusetts 02215, USA.
Division of Material Science and Engineering, Boston University, Boston, Massachusetts 02215, USA.
Rev Sci Instrum. 2023 Jan 1;94(1):014708. doi: 10.1063/5.0125097.
Inductive circuits and devices are ubiquitous and important design elements in many applications, such as magnetic drives, galvanometers, magnetic scanners, applying direct current (DC) magnetic fields to systems, radio frequency coils in nuclear magnetic resonance (NMR) systems, and a vast array of other applications. They are widely used to generate both DC and alternating current (AC) magnetic fields. Many of these applications require a rapid step and settling time, turning the DC or AC magnetic field on and off quickly. The inductive response normally makes this a challenging thing to do. In this article, we discuss open loop control algorithms for achieving rapid step and settling times in four general categories of applications: DC and AC systems where the system is either under- or over-damped. Each of these four categories requires a different algorithm, which we describe here. We show the operation of these drive methods using Simulink and Simscape modeling tools, analytical solutions to the underlying differential equations, and experimental results using an inductive magnetic coil and a Hall sensor. Finally, we demonstrate the application of these techniques to significantly reduce ringing in a standard NMR circuit. We intend this article to be practical, with useful, easy-to-apply algorithms and helpful tuning tricks.
感应电路和器件在许多应用中无处不在，是非常重要的设计元素，例如磁驱动器、检流计、磁扫描仪、向系统施加直流 (DC) 磁场、磁共振 (NMR) 系统中的射频线圈，以及大量其他应用。它们被广泛用于产生直流和交流 (AC) 磁场。许多这些应用都需要快速的阶跃和稳定时间，快速打开和关闭直流或交流磁场。感应响应通常使得这变得具有挑战性。在本文中，我们讨论了用于实现四种常见应用中快速阶跃和稳定时间的开环控制算法：系统欠阻尼或过阻尼的直流和交流系统。这四个类别中的每一个都需要不同的算法，我们在这里进行描述。我们使用 Simulink 和 Simscape 建模工具展示这些驱动方法的操作、基础微分方程的解析解，以及使用感应磁线圈和霍尔传感器的实验结果。最后，我们展示了这些技术在显著减少标准 NMR 电路中的振铃方面的应用。我们希望本文具有实用性，提供有用的、易于应用的算法和有用的调谐技巧。
