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Motor current measurement techniques as well as predictive control algorithms for electric drives rely on an assumption of linear motor currents changes resulting from constant inverter output voltages. Recent research has reported that this assumption does not hold in motors with short electrical time constant, and in drives whose rotor position advances substantially during a control period. This...
The paper deals with possibilities of geometry simplification for FE structural model calculating natural frequencies and mode shapes of rotor of small squirrel-cage induction motor. Proposed simplifications lead to the computing time savings while good result accuracy is preserved. All results are verified by experimental measurement.
Models are crucial in the engineering design process because they can be used for both the optimisation of design parameters and the prediction of performance. Thus, models can significantly reduce design, development and optimisation costs. This paper presents the construction process of a novel equivalent electrical model for Darrieus-type vertical axis wind turbines (DTVAWTs). Physical concepts...
Controller design for transverse flux machines is a substantial challenge due to their nonlinear dynamic behavior. This paper places particular emphasis on the phase current control loop since it directly affects the generated torque. A state space representation of phase current harmonics in transverse flux machines is introduced to expand applicable control structures. A speed dependent feedforward...
This paper evaluates the performance of a 6/4 axial flux switched reluctance motor (AFSRM), with only one stator, considering the contribution of the mutual inductances on the torque. To estimate the self and mutual inductances, one computational approach based on the three-dimensional finite element method, was implemented. Different from the most conventional models of the radial flux SRM, this...
In this study a wound rotor AC induction machine which can be used in wind turbine is modeled in LabVIEW program and the system model optimization is done with system identification (SI) method. Wind turbines are usually used as synchronous and asynchronous. In this study, to be safe and because of the advantages such as low costs, WRIM is preferred. In the control of the excitation circuit, SI method...
The modern design of an induction traction machine includes a complex of coupled electromagnetic and thermal analyses for effective utilization of machine's space. This paper summarizes a comparison between less and more complicated ways of induction machine's modelling.
The control of active and reactive power of a doubly-fed machine (DFM) can be—due to the application of power electronics—very rapid, comparable to the control of FACTS devices. Besides DFMs in pumping-storage plants will become an important part of Slovenian electric-power system and it is important to know how these machines are working. This paper presents how to model a control of a DFM in a pumping-storage...
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