Measurements of the influence of core geometry, eddy currents and permeability on the axial flux distribution in laminated steel cores

1980 ◽  
Vol 127 (2) ◽  
pp. 57
Author(s):  
P.J. Tavner
Keyword(s):  
Flux Distribution ◽  
Eddy Currents ◽  
Axial Flux

Quasi 3D modelling and simulation of axial flux machines

2014 ◽  
Vol 33 (4) ◽  
pp. 1220-1232 ◽  
Author(s):  
Ossi Niemimäki ◽  
Stefan Kurz
Keyword(s):  
Eddy Currents ◽  
Simulation Models ◽  
Coupled System ◽  
3D Modelling ◽  
Modelling And Simulation ◽  
Future Research ◽  
Axial Flux ◽  
Content Type ◽  
2D Simulation ◽  
Magnetostatic Problem

Purpose – The purpose of this paper is to investigate the theoretical foundation of the so-called quasi 3D modelling method of axial flux machines, and the means for the simulation of the resulting models. Design/methodology/approach – Starting from the first principles, a 3D magnetostatic problem is geometrically decomposed into a coupled system of 2D problems. Genuine 2D problems are derived by decoupling the system. The construction of the 2D simulation models is discussed, and their applicability is evaluated by comparing a finite element implementation to an existing industry-used model. Findings – The quasi 3D method relies on the assumption of vanishing radial magnetic flux. The validity of this assumption is reflected in a residual gained from the 3D coupled system. Moreover, under a modification of the metric of the 2D models, an axial flux machine can be presented as a family of radial flux machines. Research limitations/implications – The evaluation and interpretation of the residual has not been carried out. Furthermore, the inclusion of eddy currents has not been detailed in the present study. Originality/value – A summary of existing modelling and simulation methods of axial flux machines is provided. As a novel result, proper mathematical context for the quasi 3D method is given and the underlying assumptions are laid out. The implementation of the 2D models is approached from a general angle, strengthening the foundation for future research.

scholarly journals Analysis of Motional Eddy Currents in the Slitted Stator Core of an Axial-Flux Permanent-Magnet Machine

2020 ◽  
Vol 56 (2) ◽  
pp. 1-4
Author(s):  
L. A. J. Friedrich ◽  
B. L. J. Gysen ◽  
J. W. Jansen ◽  
E. A. Lomonova
Keyword(s):  
Permanent Magnet ◽  
Eddy Currents ◽  
Axial Flux ◽  
Stator Core ◽  
Permanent Magnet Machine

scholarly journals Innovative Construction of the AFPM-Type Electric Machine and the Method for Estimation of Its Performance Parameters on the Basis of the Induction Voltage Shape

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 236
Author(s):  
Andrzej Smoleń ◽  
Lesław Gołębiowski ◽  
Marek Gołębiowski
Keyword(s):  
Eddy Currents ◽  
Unscented Kalman Filter ◽  
Performance Parameters ◽  
Induced Voltage ◽  
Axial Flux ◽  
Rotational Angle ◽  
Rotor Design ◽  
Computational Procedures ◽  
Limit Energy ◽  
Generator Performance

The article presents an innovative construction of the Axial Flux Permanent Magnet (AFPM) machine designed for generator performance, which provides the shape of induced voltage that enables estimation of the speed and rotational angle of the machine rotor. Design solutions were proposed, the aim of which is to limit energy losses as a result of the occurrence of eddy currents. The method of direct estimation of the value of the rotational speed and rotational angle of the machine rotor was proposed and investigated on the basis of the measurements of induced voltages and machine phase currents. The advantage of the machine is the utilization of simple and easy-to-use computational procedures. The acquired results were compared with the results obtained for estimation performed by using the Unscented Kalman Filter (UKF).

Field Distribution of Strongly Excited Magnetic Lenses

1975 ◽  
Vol 33 ◽  
pp. 140-141
Author(s):  
M. Strojnik
Keyword(s):  
Flux Density ◽  
Field Distribution ◽  
Optical Axis ◽  
Operating Point ◽  
Pole Piece ◽  
Partial Saturation ◽  
Axial Flux ◽  
The Stability

Magnetic lenses operating in partial saturation offer two advantages in HVEM: they exhibit small cs and cc and their power depends little on the excitation IN. Curve H, Fig. 1, shows that the maximal axial flux density Bz max of one of the lenses investigated changes between points (3) and (4) by 5% as the excitation varies by 40%. Consequently, the designer can relax the requirements concerning the stability of the lens current supplies. Saturated lenses, however, can only be used if (i) unwanted fields along the optical axis can be controlled, (ii) 'wobbling' of the optical axis due to inhomogeneous saturation around the pole piece faces is prevented, (iii) ample ampere-turns can be squeezed into the space available, and (iv) the lens operating point covers a sufficient range of accelerating voltages.

Determination of eddy current losses and hysteresis losses in magnetic circuits of electrical machines

2020 ◽  
pp. 54-58
Author(s):  
S. M. Plotnikov
Keyword(s):  
Eddy Current ◽  
Magnetization Reversal ◽  
Eddy Currents ◽  
Technical Problem ◽  
Electrical Machines ◽  
Eddy Current Losses ◽  
Hysteresis Losses ◽  
Magnetic Circuits ◽  
Core Losses ◽  
Reversal Frequency

The division of the total core losses in the electrical steel of the magnetic circuit into two components – losses dueto hysteresis and eddy currents – is a serious technical problem, the solution of which will effectively design and construct electrical machines with magnetic circuits having low magnetic losses. In this regard, an important parameter is the exponent α, with which the frequency of magnetization reversal is included in the total losses in steel. Theoretically, this indicator can take values from 1 to 2. Most authors take α equal to 1.3, which corresponds to the special case when the eddy current losses are three times higher than the hysteresis losses. In fact, for modern electrical steels, the opposite is true. To refine the index α, an attempt was made to separate the total core losses on the basis that the hysteresis component is proportional to the first degree of the magnetization reversal frequency, and the eddy current component is proportional to the second degree. In the article, the calculation formulas of these components are obtained, containing the values of the total losses measured in idling experiments at two different frequencies, and the ratio of these frequencies. It is shown that the rational frequency ratio is within 1.2. Presented the graphs and expressions to determine the exponent α depending on the measured no-load losses and the frequency of magnetization reversal.

Flux Distribution in a Superconducting Synchronous Generator on Load

1981 ◽  
Vol 101 (11) ◽  
pp. 698-698
Author(s):  
Itsuya Muta ◽  
Eiichi Mukai ◽  
Masaru Yagi
Keyword(s):  
Flux Distribution ◽  
Synchronous Generator
Sign in / Sign up

Export Citation Format

Share Document