Study of vector control strategy on Interior Permanent Magnet Synchronous Motors

Sammanfattning: This thesis presents a comprehensive study of Direct Torque Control (DTC) for Interior Permanent Magnet Synchronous Motors (IPMSMs) evaluating its potential in high performance motor drive systems. The research begins with a literature review, looking into the fundamental principles of DTC, Pulse Width Modulation (PWM), Space Vector Modulation (SVM) and Field Oriented Control (FOC). The methodology section involves the detailed modeling of IPMSM using Simulink for a precise representation of system dynamics. The Park and Clarke transformations are employed in the phase transformation of currents and voltages to simplify the control strategy. The implementation of Voltage Source Inverter (VSI) is explored and its crucial role in modulating input signals is discussed. Subsequently, the implementation of DTC is demonstrated, capturing the key focus of the thesis. The validation stage verifies the model created in Simulink against research papers published in the same field. This is coupled with an analysis of sector selection and switching table in enhancing DTC performance. The results and conclusion reassess the voltage and flux vectors, evaluating their influence on the system. Additionally, the effectiveness of Proportional-Integral (PI) control for maintaining the desired speed and torque is analyzed. Thus, this thesis offers a holistic perspective on the implementation and performance of DTC for IPMSMs, contributing to the existing body of knowledge and paving the way for future research in this field.