Control Methods for Permanent Magnet Synchronous Motors (PMSM)

This report delves into the realm of Permanent Magnet Synchronous Motor (PMSM) control, exploring various sensorless techniques used for torque and speed regulation. It provides a comprehensive overview of different control methods, including zero voltage vector injection, voltage/frequency control, back EMF control, and average terminal voltage methods. The report offers a detailed mathematical exploration of rotor position approximation and the operational principles of each method. A significant portion of the report is dedicated to the Halbach array method, elaborating on its advantages and applications within PMSM systems. The report includes an examination of the Halbach array's working principles, circumferential and planar magnetic field arrangements, and its application in PMSM, supported by mathematical prototypes and case studies comparing radial and Halbach magnet array machines. Moreover, the report analyzes the limitations of other methods, such as the average terminal voltage and rotor position estimation, before concluding with the advantages of the Halbach array method. The report is enriched with figures, abbreviations, and references, providing a thorough understanding of the subject matter and its practical applications in electrical engineering.