PUBLICATIONS

This thesis proposes a sensorless control and flux-weakening control method for a single inverter dual parallel (SIDP) interior permanent magnet synchronous motor (IPMSM) drive system. SIDP IPMSM drive system that operates two IPMSMs with one inverter requires an additional controller to compensate for the electrical imbalances caused by the difference in load torque between the two motors. An active damping control method which adjusts the slave motor torque to maintain synchronization with the master motor is proposed to address this issue. However, most existing SIDP IPMSM system rely on position sensors. A sensorless control strategy based on an extended back-electromotive force (EMF) is adopted to enable rotor position and speed estimation without mechanical sensors. Furthermore, an I-F control method is employed to enhance stability during low-speed operation. Additionally, a flux-weakening control strategy is implemented to extend the operating speed range into the high-speed region. The effectiveness of the proposed sensorless and flux-weakening control methods for the SIDP IPMSM drive system is validated through simulation and experimental results.