DSP-based implementation of new random switching technique of inverter control for sensorless vector-controlled induction motor drives

The DSP-based implementation of a new random switching technique of inverte r control for sensorless vector-controlled induction motor drives is presen ted. All the necessary software schemes required for the implementation of the new random switching technique of inverter control for vector-controlle d induction motor drives are developed in detail. The advantages and specia l features of the new random switching technique are highlighted and demons trated. It is shown how simply the control system, including the inverter c ontroller based upon the new random switching technique, and the sensorless vector controller, can be implemented by an off-the-shelf digital signal p rocessor (DSP) starter kit using software, without resorting to additional analogue circuits or a dedicated inverter control chip. It is thereby demon strated that the new random switching technique of inverter control can be easily incorporated into existing vector-controlled motor drive systems. Ex perimental results from a DSP-based sensorless vector-controlled drive syst em are presented to confirm the theoretical analysis, software and hardware design.