Comparative Evaluation of Field Oriented Control and Direct Torque Control Methodologies in Field Weakening Regions for Interior Permanent Magnet Machines

The comparative study on the field-oriented control (FOC) and direct-torque control (DTC) algorithms for interior permanent magnet (IPM) machine is presented in this paper. The study covers the dynamic performance of IPM under these two control strategies in constant torque and field weakening (FW) regions. The analyzation of power switches losses including the switching and conduction loss also are discussed as IPM is controlled with applying the aforementioned control strategies. So far, the critical evaluation on the basis of the power electronic losses and dynamic performance of IPM in all operational regions has not been presented. In this paper, the analytical and simulation results are provided in order to demonstrate the advantages and disadvantages of each control methodology.