Vector control of current source inverter-fed axial-flux permanent magnet motors with space vector pulse width modulation

This paper presents the vector control design of an axial-flux permanent magnet motor (AFPM) driven by a current source inverter (CSI), which is considered as having many advantages over the voltage source inverter. The control system consists of a 2-DOF speed controller, a multi-loop current controller, and an SVPWM modulation block, which can offer a faster dynamic response, an instantaneous adjustment of the modulation index, and a precise control of the ac motor current magnitude and phase. To evaluate the effectiveness of the proposed control system, computer simulation in PSIM were performed. The speed response of the proposed 2-DOF controller can quickly track the step speed command and reach the steady state even if the load torque is suddenly added to the system.