Abstract
This thesis is mainly concerned with the establishment of a digital signal processor (DSP) based switched-reluctance motor (SRM) drive with three-phase boost switch-mode rectifier (SMR) front-end. And the experimental evaluation is made for different motor drive current-controlled PWM schemes and SMR schematics. First, after comprehending the basics and key issues of SRM, an experimental SRM drive equipped with modified Miller’s is established. The operating characteristics of motor drive using ramp comparison current-controlled pulse width modulated (RC-CCPWM) and hysteresis current-controlled pulse width modulated (H-CCPWM) schemes are comparatively evaluated in current, vibration and speed ripple. The features of applying random switching and commutation instant advanced shift are also observed. Next, a three-phase single-switch (3P1SW) boost switch-mode rectifier is first designed and implemented. It is operated under discontinuous conduction mode (DCM) without current-mode control. The boostable DC output voltage with satisfactory line drawn power quality can be obtained. Then the zero-current transition (ZCT) soft- switching control is applied to avoid the hard-switching disadvantages possessed by its main switch. Moreover, a bridgeless DCM three-phase SMR is proposed to enhance the efficiency of the standard 3P1SW DCM SMR. Finally, the SRM drives powered by the designed three types of front-end SMRs are established, and their driving performances are compared experimentally.