On the Importance of Incorporating Iron Losses in the Magnetic Field Solution of Electrical Machines

2010 ◽  
Vol 46 (8) ◽  
pp. 3101-3104 ◽  
Author(s):  
Emad Dlala ◽  
Anouar Belahcen ◽  
Antero Arkkio
Keyword(s):  
Magnetic Field ◽  
Electrical Machines ◽  
Field Solution ◽  
Iron Losses ◽  
The Magnetic Field

scholarly journals Two-dimensional hybrid model for magnetic field calculation in electrical machines: exact subdomain technique and magnetic equivalent circuit

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Brahim Ladghem Chikouche ◽  
Kamel Boughrara ◽  
Dubas Frédéric ◽  
Rachid Ibtiouen
Keyword(s):  
Magnetic Field ◽  
Maxwell’S Equations ◽  
Maxwell's Equations ◽  
Current Density Distribution ◽  
Electrical Machines ◽  
Field Calculation ◽  
Two Dimensional ◽  
Content Type ◽  
The Magnetic Field ◽  
Load Conditions

Purpose The purpose of this paper is to propose a two-dimensional (2-D) hybrid analytical model (HAM) in polar coordinates, combining a 2-D exact subdomain (SD) technique and magnetic equivalent circuit (MEC), for the magnetic field calculation in electrical machines at no-load and on-load conditions. Design/methodology/approach In this paper, the proposed technique is applied to dual-rotor permanent magnet (PM) synchronous machines. The magnetic field is computed by coupling an exact analytical model (AM), based on the formal resolution of Maxwell’s equations applied in subdomains, in regions at unitary relative permeability with a MEC, using a nodal-mesh formulation (i.e. Kirchhoff's current law), in ferromagnetic regions. The AM and MEC are connected in both directions (i.e. r- and theta-edges) of the (non-)periodicity direction (i.e. in the interface between teeth regions and all its adjacent regions as slots and/or air-gap). To provide accurate solutions, the current density distribution in slot regions is modeled by using Maxwell’s equations instead to MEC and characterized by an equivalent magnetomotive force (MMF) located in the slots, teeth and yoke. Findings It is found that whatever the iron core relative permeability, the developed HAM gives accurate results for both no-load and on-load conditions. Finite element analysis demonstrates the excellent results of the developed technique. Originality/value The main objective of this paper is to achieve a direct coupling between the AM and MEC in both directions (i.e. r- and theta-edges). The current density distribution is modeled by using Maxwell’s equations instead to MEC and characterized by an MMF.

A DECOMPOSITION OF L2(Ω)3 AND AN APPLICATION TO MAGNETOSTATIC EQUATIONS

1993 ◽  
Vol 03 (03) ◽  
pp. 289-301 ◽  
Author(s):  
PATRICK CIARLET
Keyword(s):  
Magnetic Field ◽  
Connected Subset ◽  
Field Solution ◽  
The Magnetic Field

The domain Ω considered in the following is an open, bounded and connected subset of R3. The purpose of this paper is to find a decomposition of the space of functions L2(Ω)3 of the form grad P⊕ curl W and then to apply this result to the magnetostatic set of equations. Moreover, we prove that if the spaces P and W are chosen correctly, a function u of L2(Ω)3 can be written as grad p+curl w, p∈P and w∈W being unique (up to a constant for p). In the case of the magnetostatic equations, we provide a characterization of the magnetic field solution of these equations.

Vector magnetic property of electrical steel sheet and its influence on distributions of magnetic field and iron loss for electrical machines

2013 ◽  
Vol 33 (1/2) ◽  
pp. 14-27 ◽  
Author(s):  
Heesung Yoon ◽  
Chang Seop Koh
Keyword(s):  
Magnetic Field ◽  
Magnetic Property ◽  
Steel Sheet ◽  
Electrical Steel ◽  
Electrical Machines ◽  
Iron Loss ◽  
Element Analysis ◽  
Content Type ◽  
Electrical Steel Sheet ◽  
The Magnetic Field

Purpose – The purpose of this paper is to present the vector magnetic properties of the electrical steel sheet and investigate its influences on the magnetic field and iron loss distributions for the electrical machines. Design/methodology/approach – The vector magnetic property of the electrical steel sheet is measured by using a two-dimensional single sheet tester and modelled through an E&S vector hysteresis model to be applied to finite element analysis. Findings – The magnetic field and iron loss distributions are calculated by finite element analysis combined with the E&S vector hysteresis model for the three-phase transformer and induction motor models. Originality/value – The influences of the vector magnetic property on the electrical machines are verified by comparing with the numerical results from a scalar magnetic property.

Analytical calculation of the magnetic field in electrical machines with HTS excitation and armature windings

2019 ◽  
Vol 6 (7) ◽  
pp. 076001 ◽  
Author(s):  
Sergey Zhuravlev ◽  
Boris Zechikhin ◽  
Nikolay Ivanov ◽  
Julia Nekrasova
Keyword(s):  
Magnetic Field ◽  
Analytical Calculation ◽  
Electrical Machines ◽  
The Magnetic Field

Observing the galactic magnetic field

1967 ◽  
Vol 31 ◽  
pp. 375-380
Author(s):  
H. C. van de Hulst
Keyword(s):  
Magnetic Field ◽  
Fair Agreement ◽  
Solar Neighbourhood ◽  
Galactic Magnetic Field ◽  
The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

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