| Abstract |
It has been demonstrated in some publications that the advantages of random inverter switching techniques for drive applications include the reduction of acoustic noise, vibration and conducted electromagnetic interference. However, for the inverter controlled by the randon switching techniques as demonstrated in another publication, it is required to adjust the gains of current controllers in every sampling interval if the current controllers operate with a variable sampling interval synchronized with the switching interval of the inverter controller. The reason for this result is that the sampling frequency of the random inverter switching techniques is not regular. In this paper, it is intended to show the newly developed random switching technique which does not invoke any change to the sampling processes, can be easily applied to inverter control in a vector-controlled drive. Therefore, it is demonstrated that the new random switching technique can be an alternative choice for inverter control in a microprocessor-controlled drive system, without requiring to adjust the gains of current controllers in every sampling interval. Experimental resulmts derived from a sensorless induction motor drive using a digital signal processor (DSP) as the controller will be presented. the features of the new random switching technique will be highlighted by these experimental results. |
