Electromagnetic weight compensation system

This article presents in detail the results of the research and development of a unique active electromagnetic weight compensation system created by engineers at JSC «Reshetnev». The primary purpose of this system is to conduct modal testing of modern, weakly damped structures typical of the space industry. The key objective of the system is to create and maintain conditions that accurately simulate zero-gravity conditions on Earth. This effect is achieved through a complex, precisely controlled interaction of electrodynamic forces. The authors describe in detail the system's basic operating principle and its design implementation, paying particular attention to the description of key components. An innovative method for generating the control current dependence on the coordinates of the moving element, which forms the basis for precise control, is proposed and mathematically substantiated. To ensure the highest stability and dynamic accuracy, advanced control algorithms using PID control were integrated and adapted into the system. A significant improvement in control quality was achieved through the implementation of a specialized high-power current amplifier, which eliminated the induced electromotive force and significantly increased the accuracy of the excitation force setting. A series of experimental studies and tests fully confirmed the high operational feasibility and effectiveness of all developed technical solutions. The results also allowed us to identify specific promising areas for further optimization of the system to improve its performance.