R. Carlson

A general method for coupling static converters with electromagnetic structures

A method allowing coupling of static converters with electromagnetic devices represented by finite elements analysis is presented. Special attention is paid to the fact that the state-variable equations of the static converter are calculated automatically. These equations are then solved simultaneously with those of the electromagnetic structure, step by step with respect to time.

A new approach for iron losses calculation in voltage fed time stepping finite elements

A methodology allowing one to include iron losses in voltage fed time stepping finite elements simulations is presented in this paper. Hysteresis, eddy currents and anomalous losses models are introduced in the 2D field formulation based on the magnetic vector potential. The influence of the losses on the behavior of an Epstein frame is given. Comparison between simulated and measured results shows the validity of the proposed methodology.

A modified Jiles method for hysteresis computation including minor loops

Abstract This work presents a new methodology for determination of hysteresis curves based on the Jiles–Atherton method. The magnetic induction is adopted as an independent variable which is available in the vector potential magnetic field formulation. The presented method can be directly incorporated in a finite element software.

Finite elements coupled to electrical circuit equations in the simulation of switched reluctance drives: attention to mechanical behaviour

A method to model the switched reluctance motor is presented in this paper. The methodology is based on the simultaneous solution of the magnetic field, represented by the two-dimensional finite element method, with electrical circuit equations. With this model, the currents in the windings are calculated and the force distribution on the stator teeth is obtained. The mechanical response to magnetic forces is calculated by a finite element code.

Single-phase line-started permanent magnet motor analysis using finite element method

The single-phase line-start permanent magnet synchronous motor is studied in this paper as an alternative for the single-phase induction motor used in appliances to obtain gain in efficiency. The two dimensional finite element method is used to represent the machine. The motor is fed by means of an electrical circuit and the analysis is carried out through the simultaneous solution of the electrical feeding circuit equations and the field equations.<<ETX>>

Calculation of electromagnetic-mechanic-acoustic behavior of a switched reluctance motor

This paper deals with the coupling between magnetic forces, forced vibrations and noise in a Switched Reluctance motor. The finite element method is used to obtain the magnetic forces and forced vibrations. The boundary element method is used for acoustic computations.

Dynamic modeling of a newly designed linear actuator using 3D edge elements analysis

A newly designed linear actuator using permanent magnets is analyzed. In order to evaluate its dynamic performance, the coupling between electromagnetic equations is established. Due to the different phenomena involved, analytical procedures cannot provide reliable results. Thus the magnetic forces and other quantities are obtained by 2D and 3D calculations. In order to obtain the 3D field values, edge elements are used; with this type of finite elements, modeling taking into account the permanent magnets is also introduced.

Performance Analysis with Power Factor Compensation of a 75 kW Brushless Doubly Fed Induction Generator Prototype

This paper presents an analysis of a 75 kW brushless doubly fed induction generator (BDFIG) prototype. Experimental results are presented for the prototype in the cascade mode that enables a comparison in terms of efficiency and power factor with an equivalent wound-rotor doubly fed induction generator. The generators control system is based on vector control principles which enable to decouple active and reactive power control. The power flow in the two stator windings (power and control windings) and in the grid is analyzed with and without the reactive compensation capacitor bank in the grid using a MatLab/Simulink simulation model. Four cases were studied: (a) the reactive power compensation of the machine is realized only by the control-side converter; (b) the reactive power compensation is realized by both converters (control-side and grid-side converters); (c) the reactive power compensation of the machine is performed only by the control- side converter and a capacitor bank connected at the grid terminals and (d) the reactive power compensation is performed by both converters and a capacitor bank is connected at the grid terminals. The main advantage is obtained with the last case resulting in a significant improvement of the overall system efficiency.

Simulation of single-phase induction motor by a general method coupling field and circuit equations

A general method for coupling field and electrical circuit equations is presented in this work. The external electrical equations associated with the feeding circuit are represented in state space form. To illustrate the proposed methodology the dynamical operation of a single-phase induction motor is carried out. >

The effect of the stator-slot opening on the interbar currents of skewed cage induction motor

This work uses a method based on the two-dimensional (2-D) finite-element method (FEM) and on the circuits theory to model the interbar currents in a skewed cage induction motor. With this model, the effects of the stator-slot opening on interbar currents are analyzed. Two values of the stator-slot width are considered. The skewing effect is taken into account by the multislice technique.