Projects 

To meet the growing demand for better dynamic performance and quieter operation in domestic refrigeration systems, this work introduces a double-integral sliding mode vector control (DISMVC) scheme for the sensorless control of an Interior Permanent Magnet Synchronous Motor (IPMSM). Traditional control methods often struggle with limited operating ranges, leading to noticeable peak overshoots. The proposed DISMVC approach overcomes these limitations by enabling smooth and stable control across a wider speed range.

At the core of this strategy is a double-integral sliding surface, which enhances the system’s ability to track speed references instantly while effectively reducing overshoot. To further improve performance, the method replaces the typical discontinuous signum function—known for causing chattering—with a sigmoidal function. This modification greatly reduces current chattering and torque ripple, ultimately lowering vibrational noise, which is crucial for maintaining quiet operation in refrigerators.

This project focuses on implementing IPMSM drive control for electric-vehicle applications using Maximum Torque Per Ampere (MTPA) to enhance efficiency and torque production. It also explores sensorless operation to remove mechanical sensors, improving system reliability, reducing cost, and enabling robust performance across a wide speed range.