A kind of speed sensorless sliding -mode observers for induction motors has been developed. In this paper a new topology of such observer is investigated in order to determine its feasibility, robustness to parameter changes and practical applicability on digital signal processor. The positive feature of the proposed scheme is that it doesn't require the rotor speed feedback or adaptation, only measured variables such as stator current and DC voltage are required. Experimental results on DSP TI LF2407A, presented in the end of the paper show good correspondence with proposed theory.
This paper deals with the design method for controlling of the entry filter for tram or trolley bus. The solution of entry filter must contain the switch on/off modes and simulation of particular working modes with fulfilling technical conditions and parameters.
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