In a significant advancement for the energy sector, researchers from Northwestern Polytechnical University have unveiled a novel control strategy for permanent magnet synchronous motors (PMSMs) that promises to enhance efficiency and performance in various applications. Led by Guan Wenqing from the School of Automation, this research addresses critical challenges in motor control, particularly those stemming from inverter dead zones, harmonic distortions, and sampling errors.
The study introduces an improved self-coupled PI control strategy that combines dual-loop control with an acceleration feed-forward technique. This innovative approach is designed to minimize tracking errors, ensuring that the motors operate more smoothly and responsively. “Our goal was to create a system that not only improves control accuracy but also enhances robustness against the inherent noise in motor operations,” says Guan.
One of the standout features of this control strategy is the incorporation of a Levant differentiator within the speed loop of PMSMs. This addition allows for a more precise derivation of input signals, which is crucial for maintaining performance in fluctuating conditions. The research also integrates a proportional resonant autotuned PI control structure in the current loop, which effectively compensates for current variations and suppresses harmonics, particularly in low-speed scenarios.
The implications of this research are vast. As industries increasingly rely on electric motors for automation and energy efficiency, the ability to mitigate issues like harmonic distortion can lead to significant cost savings and improved system longevity. Guan emphasizes the commercial potential: “By enhancing motor control, we can help industries reduce energy consumption and operational costs, which is essential in today’s competitive market.”
The experimental results validate the effectiveness of the proposed strategy, showcasing its ability to maintain performance despite changes in motor parameters. This breakthrough could pave the way for future developments in motor control technologies, potentially influencing sectors ranging from manufacturing to renewable energy systems.
Published in ‘Xibei Gongye Daxue Xuebao’ (Journal of Northwestern Polytechnical University), this research not only contributes to the academic landscape but also holds promise for practical applications that could redefine energy efficiency standards across various industries. For more information about the research team, visit Northwestern Polytechnical University.
