Abstract
Recently development of power electronics technology has made it possible to realize a ultra high speed drive and a ultra high speed drive has been expected in various applications. This research aims at sensorless control drive of induction machine in the ultra high speed region by utilizing rotor slot harmonics, which occur due to structure of induction machine. In this paper, we focus on the slot harmonics which appear to a neutral point voltage, and we propose a detection method of slot harmonics voltage and a speed estimation method utilizing FFT with limitation of detection band. Moreover, the effectiveness of the proposed method and possibility of speed sensorless control with proposed method is illustrated through speed estimation results of off-line and on-line.
