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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

2017

Vol. 66, nr 2

383--396

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.

Measurement of magnetic properties under alternating field with a vertical rotational Single Sheet Tester

Fonteyn K., Rasilo P., Belahcen A.

Przegląd Elektrotechniczny

2009

R. 85, nr 1

52-54

In this work, the influence of the angle between the x- and y directions is discussed, providing a verification method for the position of the acquisition coils. The sample is excited under a sinusoidal waveform, within a wide range of frequencies. The specific total power losses are evaluated and it is concluded that he setup meets well the theoretical requirements.

Artykuł opisuje wpływ kąta pomiędzy kierunkami x i y jako metodę weryfikacji położenia cewek pomiarowych. Próbka jest magnesowana przebiegami sinusoidalnymi w szerokim zakresie częstotliwości. Całkowite straty mocy na przemagnesowanie zostały wyznaczone i określono, że system spełnia założenia teoretyczne.