Adaptive Flux model for commissioning of signal injection based zero speed sensorless flux control of induction machines

Abstract

Speed sensorless control of AC machines at zero speed so far is only possible using signal injection methods. Especially when applied to induction machines spatial saturation leads to a heavy dependence of the control signals on the flux/load level. This dependence has to be identified on a special test stand during a commissioning procedure. To avoid the usage of a speed sensor as well as load dynamometer coupled during the commissioning an adaptive flux model is proposed that delivers an accurate reference flux angle. After the commissioning this adaptive flux model is used in combination with the signal injection method to deliver the spatial flux position.