In turbomachines, dry friction resulting from stator–rotor contacts is a severe problem that may degrade lifetime of the machine or even lead to complete failure. Knowledge about system states and contact forces beneficial for monitoring prevent through, e.g., active magnetic bearings. this paper, nonlinear model derived describes lateral rotor vibrations in case no contact. The elastic behavio...

sensorless speed torque control of induction machines has been widely used in many industrial applications. the simple method of direct vector control can provide tacholess control as well as more complex approaches. in this method, the motor flux can be obtained by measuring voltage and current and integrating motor back electromotive force. the only required motor parameter is stator resistan...

This paper presents a sliding mode observer for sensorless operation of SRM (switched reluctance motor) drive. Design of such an observer depends mainly on the nonlinear model of SRM. In this technique, neither extra hardware nor huge memory space arenot required but it only requires active phase measurements. Furthermore, PI (proportional integral) are suggested to operate individually along w...

The article presents a method of fuzzy cognitive modeling for heterogeneous electromechanical systems (HEMSs) in the management innovative design solutions. During operation HEMSs, as result their operational aging, properties windings parametric matrices and HEMSs vector space change. Periodic testing allows obtaining reliable information about current technical condition its changes during ri...