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Speed sensorless vector controlled induction motor drives have become very popular for motion-control applications due to their robustness. The performance of flux and speed observer is strongly influenced by the deadtime and inverter non-linear error at the low speed range. In most applications, the effect of deadtime can be offset by compensating the pulsewidth of PWM signal. However, the inverter...
For a V/F controlled induction motor drive system, the instability problem of sustained oscillations has often been experienced in light load state. This paper analyzes the relationship between the oscillations and the fluctuation of reactive currents and then proposes a method to improve the stability of conventional V/F control algorithm. This paper contributes to the solution of this problem based...
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