Abstract
This thesis presents the development of a digital signal processor (DSP) based permanent-magnet synchronous motor (PMSM) drive powered by different kinds of front-end AC/DC converters and position sensorless control methods. For being a test platform, a standard PMSM drive with properly designed control schemes is first established, and its satisfactory operating performance is verified by some measured results. Next, three types of single-phase switch-mode rectifiers (SMRs) are developed, these include a non-isolated standard boost SMR, a non-isolated bridgeless boost SMR and an isolated boost SMR based on current-fed push-pull converter cell. After confirming the effectiveness of the designed SMRs under resistive load, they are employed to serve as the front-end of PMSM drive. All the control schemes in the SMR-fed PMSM drives are fully digitally realized in a common DSP. Some experimental results are provided to perform the comparative evaluation between the PMSM drives equipped with different types of SMRs. Finally, having reviewed some commonly used existing position sensorless control methods of PMSM drive, two sensorless control schemes based on high-frequency signal injection and observed extended-EMF are developed. And the comparative performance evaluation is made in their starting and running characteristics. Basically, the high-frequency signal injection based sensorless method can be directly started under vector control at standstill owing to the available observed absolute rotor position around zero speed. As to the observed extended-EMF based approach, since the observed back-EMF is insufficiently large at low speed, the starting via synchronous motor mode is unavoidable. In addition, for reducing the vibration of the established position sensorless PMSM drive, the random pulse width modulation (RPWM) is applied to randomize the phase winding current spectrum distribution.