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1

Influence of the rotor eccentricity on the torque of a cage induction machine

Silwal B., Rasilo P., Belahcen A., Arkkio A.

Archives of Electrical Engineering

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2017

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Vol. 66, nr 2

383--396

EN

The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.

2

A 2D FEM model for transient and fault analysis of induction machines

Martinez J., Belahcen A., Arkkio A.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 7b

157-160

EN

This paper presents the basic guidelines to develop a coupled FEM for the study of electromagnetic phenomena in induction motors. FEM model is formulated using the 2D magnetic vector potential. FEM model presented inside of this work presents a formulation where external circuits can be also coupled. Furthermore, the model takes into account the end effects of the end-winds and end-rings of the electrical device.

PL

W artykule przedstawiono podstawowe wytyczne do opracowania za pomocą FEM sprzężonego modelu do badania zjawisk elektromagnetycznych w silnikach indukcyjnych. Model został opracowany przy użyciu wektorów potencjałów magnetycznych w 2D. Przedstawiony model formułuje możliwości dołączenia obwodów zewnętrznych. Model uwzględnia również efekty brzegowe na skrajach uzwojeń i pierścieni.

3

Modifications of construction of rolling rotor switched reluctance motors

Arkkio A., Biernat A., Bucki B., Kamiński G., Smak A., Staszewski P.

Przegląd Elektrotechniczny

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2008

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R. 84, nr 12

18-23

EN

The work presents the design calculation and measurements of the Rolling Rotor Switched Reluctance Motor (RRSRM) for large torque/low speed applications. The design calculations for different motor constructions are made. The best model of RRSRM is finally determined. The static torque, no-load, load and thermal characteristics of the prototype motor were measured. The analysis of calculation and measurement results is presented. In addition, numerous suggestions for industrial applications are put forward.

PL

W artykule przedstawiono obliczenia projektowe i wyniki pomiarów silników reluktancyjnych przełączalnych z toczącym się wirnikiem przeznaczonych do napędów o dużym momencie i małej prędkości obrotowej. Obliczenia projektowe wykonano dla silników o różnych konstrukcjach. W rezultacie określono najlepsze rozwiązanie konstrukcyjne silnika, dla którego wyznaczono eksperymentalnie charakterystyki momentu statycznego, biegu jałowego, obciążenia oraz nagrzewania. Przedstawiono analizę wyników obliczeń i pomiarów. Podano liczne sugestie dotyczące przemysłowych zastosowań omawianych silników.

4

Simulation model and laboratory tests of switched reluctance motor with rolling rotor

Arkkio A., Biernat A., Bucki B., Kamiński G., Smak A., Staszewski P.

Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały

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2008

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Vol. 62, nr 28

52-58

EN

In the report measurements of Rolling Rotor Switched Reluctance Motor (RRSRM) laboratory model for large torque/small speed applications are presented. Laboratory model shortly described is constructed on base of the best design determined after calculations of several different motor constructions. The static torque, no-load, load and thermal characteristics of prototype motor are presented. Laboratory measurements are verified by simulated characteristics.

5

Finite element analysis for hydrogenerators

Arkkio A., Ahtiainen J., Lindgren O.

Prace Naukowe Politechniki Warszawskiej. Elektryka

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1999

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z. 111

27-36

EN

The electromagnetic characteristics of hydrogenerators are studied from the point of view of maintenance and condition monitoring. Fault conditions are modelled and simulated by time-stepping finite-element techniques. The parameters giving the best indication of a fault are searched from the results of the numerical simulations. The faults studied are short circuits in armature and field windings, static and dynamic eccentricities, shifted rotor poles and asymmetries in the geometrie shapes of the stator. The best parameters for detecting the faults are discussed. The large and complicated geometry of the hydrogenerator causes some problems for the analysis. A generator has typically 50-100 poles, and a simulation of a fault condition usually requires modelling the whole cross-sectional geometry of the generator. This means that even a simple two-dimensional finite element mesh contains 50 000-100 000 elements, and the computation times become very long. The possibilities to reduce the problem size and still maintain the accuracy needed for the purposes of condition monitoring are studied.