This thesis deals with flux estimators for speed-sensorless induction motor drives. To enhance the stability and the performance of state-of-the-art sensorless drives, new flux estimator designs based on the standard motor model are proposed. Theoretical and experimental research methods are both used. The dynamics and stability of flux estimators are analyzed using linearized models, and the e...

In this paper, the author proposes a sensorless direct torque control (DTC) of an induction motor (IM) fed by seven-level NPC inverter using artificial neural networks (ANN) and fuzzy logic controller. Fuzzy PI controller is used for controlling the rotor speed and ANN applied in switching select stator voltage. The control method proposed in this paper can reduce the torque, stator flux and to...

The domain of knowledge1 is more encompassing than that of wealth and materials. For dealing with utility of knowledge, all factors (its scarcity, its total utility, its marginal utility, specifically its diminishing marginal utility, its utilitarian value, its exchange value, etc.) that influence the evaluation need to be considered. From a communication perspective, knowledge can be traced ba...

This paper develops a sensorless vector controlled method for AC induction motor using sliding-mode observer. For developing the control algorithm, modeling of AC induction motor is presented. After that, a sliding mode observer is proposed to estimate the motor speed, the rotor flux, the angular position of the rotor flux and the motor torque from monitored stator voltages and currents. The us...

Alisfraci -The flux distribution and static force of a novel the magnets, I t is the Iength of thc coil sections, I is thc bnishless dc linear motor were calculated by 3d finite element analysis. An analflical model to increase the force to volume armature current, ic is the active conductor length vector ratio of the motor was validated by the numerical analysis as for each side of the mil and...

In this paper, the steady-state temperature of a sample 500 KW two rotor one stator Non-slotted axial flux permanent magnet motor is calculated using the finite element simulator software package. Due to the high temperature in various parts of the machine, especially at stator winding, a cooling system is designed for the motor and the temperature is recalculated. The results show that the tem...

Nelson, Andrew Lincoln: Characterization of Winding Faults in Axial Flux Reluctance Motors in the Context of Electric Vehicle Propulsion Systems. (Under the direction of Dr. Mo-Yuen Chow.) Since the late 1980’s there has been a major resurgence in electric vehicle propulsion research and development. This trend has been stimulated by various factors, including rising fossil fuel costs, environm...

The outer hair cell (OHC) underlies mammalian cochlea amplification, and its lateral membrane motor, prestin, which drives the cell's mechanical activity, is modulated by intracellular chloride ions. We have previously described a native nonselective conductance (G(metL)) that influences OHC motor activity via Cl flux across the lateral membrane. Here we further investigate this conductance and...

different methods for detecting broken bars in induction motors can be found in literature. many of these methods are based on evaluating special frequency magnitudes in machine signals spectrums. current, power, flux, etc are among these signals. frequencies related to broken rotor fault depend on slip. in industrial environment due to some phenomena - such as load oscillation, other faults an...

The traditional radial flux PMSM and axial have an effective air gap on only one side, between the stator rotor, generates electromagnetic torque. There are defects in magnetic-field utilization, it is difficult to improve torque density. Therefore, this paper proposes axial–radial-flux permanent-magnet synchronous motor (ARF-PMSM), which combines with flux, be used elevator-traction machine-dr...