Enhancing permanent magnet stepper motor accuracy and precision in biomedical application via fuzzy logic positioning approach

Abstract The limitations of Permanent Magnet Stepper Motor (PMSM), such as their low angular resolution and rotor oscillations, pose significant challenges for their use in precision industrial applications, particularly in biomedical systems. Enhancing the performance of motor drives proves to be difficult due to uncertain system parameters and varying load conditions. To address these issues and overcome the drawbacks of traditional control methods, a fuzzy logic-based control concept is introduced. In this study, we propose a fuzzy logic concept (FLC) aimed at improving the angular resolution, rotor oscillations and compensation of the position error under load of PMSM specifically in an Electrical Syringe Pump application. The FLC incorporates membership functions and rules designed with value normalization, enabling the controller to offer flexibility across a wide range of applications. Through numerical validation, the effectiveness of the proposed FLC is confirmed.