Field and field‐circuit models of electrical machines

Abstract

PurposeThe purpose of this paper is to develop and systemize the 3D finite element (FE) description of electromagnetic field in electrical machines.Design/methodology/approach3D FE models of electrical machines are considered. The model consists of FE equations for the magnetic field, equations describing eddy currents and equations, which describe the currents in the machine windings. The FE equations are further coupled by the electromagnetic torque to the differential equation of motion. In the presented field‐circuit model, the flux linkages with the windings are expressed by two components. Attention is paid to the description of machine winding. Both scalar and vector potential formulations are analysed. The FE equations are derived by using the notation of circuit theory. The methods of movement simulation and torque calculation in FE models are discussed.FindingsProposed circuit description of electromagnetic field in electrical machines conforms to the applied method of electric and magnetic circuit analysis. The advantage of the presented description is that the equations of field model can be easy associated with the other equations of the electric drive system.Originality/valueThe applied analogies between the FE formulation and the equivalent magnetic and electric network models help formulate efficient field models of electrical machines. The developed models after coupling to the models of supply and control system can be successfully used in the analysis and design electric drives.

Influence of squirrel cage geometry on the synchronisation of the line start permanent magnet synchronous motor

“…The parametrical field models of the considered machines have been elaborated in the two packages: (a) professional FEM package and (b) authors' own package, based on the algorithms presented in [7,11]. In the comparative analysis of both types of rotors analysed only the dimensions of the rotor slot have been changed.…”

Simple nonlinear MEC-based model for sensitivity analysis and genetic optimization of permanent-magnet

“…Electric machines may be studied by either analytical or numerical techniques. Although numerical methods such as finite element method (FEM) (Weilharter et al, 2011;Barba and Mognaschi, 2009;Fei et al, 2011;Schulte et al, 2006;Demenko and Hameyer, 2010;Albanese et al, 2011;Canova et al, 2001), provide a precise analysis, they are too expensive and very time-consuming. On the other hand, analytical approaches are very good compromise between simplicity and accuracy.…”