PurposeThe purpose of this paper is to present a methodology of identification and calculating vibrations of power transformers caused by magnetostriction.Design/methodology/approachAll calculations are based on finite element approach. Electromagnetic model uses 2D time stepping solution in nonlinear continuum of the core accompanied with equivalent representation of overlapping areas. Structural model is 3D with special representation for laminated core limbs. Theoretical results are compared with experimental ones obtained as operational deflection shapes from vibration measurements.FindingsTensor representation of magnetostriction stress enables calculation of equivalent forces acting on arbitrary chosen parts of laminated core. These forces converted into amplitude and phase of Fourier spectrum and introduced into structural model make possible to get displacement field with reasonable accuracy.Research limitations/implicationsAssumption of magnetic isotropy of the transformer core is the main simplification during analysis.Practical implicationsIt was proved that small deformation of the core structure originated from assembly technology may be the reason of substantial growth of the vibration level.Originality/valueThis paper provides a step‐by‐step explanation of how to get core vibration starting from magnetic field distribution.
PurposeTo develop a fast and accurate method of calculation of permanent magnet machines.Design/methodology/approachPresently two ways exist of modeling of synchronous machines – the classic one, when the concept of inductances Ld and Lq is used and the numerical, time‐stepping approach. The first cannot account for precisely the saturation effects, while the second one is highly time consuming. Proposed algorithm replaces inductances by the distributions of flux densities, which were used for their definition, obtained from finite element solutions. Mathematically, the analysis is converted from the space of trigonometric functions to the more general space of periodic functions.FindingsThe compact algorithm of analysis has been found, making it possible to extend its application to other types of machines.Research limitations/implicationsValidation of the proposed method was done only by cross‐checking with integral parameters coming from finite element solution.Practical implicationsA potentially useful idea of representation of an electric machine for control purposes.Originality/valueThe paper presents original concept of the new approach for the representation of electric machines. Parts of that methodology were discussed among specialists during two international conferences and received positive views.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.