Practical Robustness Investigation on PMSM Drive System With 10 MHz Multi-Sampling Deadbeat Control Using USPM Controller

Recently, permanent magnet synchronous motors (PMSMs) have been applied in various fields due to their advantages, including high availability and easy maintenance. Previous studies have shown that PMSM drive systems using deadbeat control exhibit good current characteristics but are susceptible to fluctuations in motor state variables. Therefore, a multi-sampling deadbeat control method is proposed based on deadbeat control with faster sampling and improved instantaneous control. Generally, drive systems are implemented using a control system with a one-sample delay system based on a DSP. In contrast, the authors have realized an instantaneous control system without a one-sample delay though high-speed computation using a USPM controller equipped with an SoC-FPGA. Furthermore, while the stability of conventional deadbeat control is degraded by parameter fluctuations of the PMSM, the proposed multisampling deadbeat control enables multiple control operations between carriers, allowing instantaneous disturbance compensation and suppressing the effects of parameter fluctuations and other disturbance elements, even between carriers. In this study, the robustness of the control system is compared with PI control, conventional deadbeat control, and multisampling deadbeat control through simulations and experiments. Theoretical stability analysis is also discussed.