Fig. 7. Eddy-current losses as a function of rotational speed. The interpolation equation of the total eddy-current loss (W) in the rotor is: (A3)Loss=4.277×10−6N2 Show moreView article Journal 2017, Electric Power Systems ResearchN. Boubaker, ... J.S. Aïgba ...
The above equation shows that the eddy current loss depends on the flux density, frequency and thickness of the material and inversely proportional to the resistivity of the material. To reduce eddy current losses intransformer, the core is made of stacked thin plates called laminations. Each pla...
Reduction of eddy current loss From the above equation, it can be understood that the eddy current loss is directly proportional to the square of the thickness of the sheet. Hence the eddy current loss can be reduced in transformers, electric motors and alternators by using thin electrically ins...
witch contribute to the "iron" losses.---The eddy current equation is solved two- dimensionally and a simple loss formula is deduced,---The influence of eddy current reaction, finite slot pitch, finite slot insulation, notches for slot wedges and iron saturation of the tooth- tips are taken...
HE eddy-current loss that is induced in the permanent magnets of brushless machines is often neglected [1]. However, this assumption may not always be justified. For example, machine designs are emerging in which the torque is produced by the interaction of a space-harmonic mag- ...
Thus, Laplace’s equation, which governs the vector magnetic potential Digital Object Identi?er 10.1109/TMAG.2005.854337 in the air-gap and magnet regions, can be solved using the separation of variables method. Subsequently, an expression for the eddy-current loss in the magnets can be derived...
A uniform current distribution in the cylindrical cable cores was assumed. The magnetization characteristic of the pipe material was assumed linear and hysteresis losses were neglected. The integral equation, the image method and approximation techniques were adopted and numerical calculations were made ...
45, NO. 2, MARCH/APRIL 2009 Eddy-Current Loss Minimization in Conducting Sleeves of Surface PM Machine Rotors With Fractional-Slot Concentrated Armature Windings by Optimal Axial Segmentation and Copper Cladding Manoj R. Shah, Fellow, IEEE, and Ayman M. EL-Refaie, Senior Member, IEEE Abstract—...
The Joule's heat loss distribution, levitation and drag forces are also analyzed. Both the space harmonic method and integral equation method are used and the effect of the vertical motion of vehicle is taken into account by analytical means. Integral equations expressed in discrete form for eddy...
It was noticed that there was a slight difference of about 2% in the core losses between the proposed loss method and ANSYS Maxwell. The reason was that in the proposed loss model the constant values in Equation (4) were assumed valid for different material thicknesses. However, in Reference...