Most recent edit on 2008-05-05 14:29:33 by DavidMeeker
Additions:
One method of capturing proximity effect and skin effect losses is to create a finite element model in which each turn in a multi-turn winding is explicitly modeled. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately represented. However, modeling every wire individually can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy of continuum methods has been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Deletions:
One method of capturing proximity effect and skin effect losses is to create a finite element model in which each turn in a multi-turn winding is explicitly modeled. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately represented. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy of continuum methods has been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Edited on 2008-05-05 14:29:03 by DavidMeeker
Additions:
One method of capturing proximity effect and skin effect losses is to create a finite element model in which each turn in a multi-turn winding is explicitly modeled. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately represented. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy of continuum methods has been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Deletions:
One finite element method of capturing proximity effect and skin effect losses is to individually model each turn in a multi-turn winding. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately modeled. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy of continuum methods has been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Edited on 2008-05-04 22:59:16 by DavidMeeker
Additions:
Under the hood, FEMM uses approximate but closed-form expressions for the equivalent conductivity and permeability of regions filled with hexagonally packed round wire, allowing proximity and skin effects to be included with ease in 2D AC field computations. A paper is available that explains the theory behind the continuum model of proximity losses and skin effects that is implemented in FEMM 4.0.
Deletions:
Under the hood, FEMM uses an approximate but closed-form expressions for the equivalent conductivity and permeability of regions filled with hexagonally packed round wire, allowing proximity and skin effects to be included with ease in 2D AC field computations. A paper is available that explains the theory behind the continuum model of proximity losses and skin effects that is implemented in FEMM 4.0.
Edited on 2008-05-04 22:58:15 by DavidMeeker
Additions:
One finite element method of capturing proximity effect and skin effect losses is to individually model each turn in a multi-turn winding. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately modeled. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy of continuum methods has been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Deletions:
One finite element method of capturing proximity effect and skin effect losses is to individually model each turn in a multi-turn winding. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately modeled. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy continuum methods have been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Edited on 2008-05-04 22:57:30 by DavidMeeker
Additions:
One finite element method of capturing proximity effect and skin effect losses is to individually model each turn in a multi-turn winding. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately modeled. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy continuum methods have been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Deletions:
One method of capturing proximity effect and skin effect losses is to individually model each turn in a multi-turn winding. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately modeled. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy continuum methods have been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Edited on 2008-05-04 22:56:15 by DavidMeeker
Additions:
One method of capturing proximity effect and skin effect losses is to individually model each turn in a multi-turn winding. By modeling each turn, the changes in current distribution within each turn due to these effects can be accurately modeled. However, modeling every wire individual wire can be very computationally expensive. An alternative approach is to replace a wound region composed many wires by a continuum with carefully selected complex-valued material properties. Although the economy continuum methods have been well-established, the approaches described in the literature typically require preliminary magnetic field computations to determine the equivalent material properties of the wound region.
Deletions:
Continuum methods for representing skin effect and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the approaches described in the literature require preliminary numerical field computations to determine the equivalent material properties of the wound region.
Edited on 2008-05-04 22:41:45 by DavidMeeker
Additions:
Proximity Effect and Skin Effect Modeling in FEMM
May 4, 2008
Continuum methods for representing skin effect and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the approaches described in the literature require preliminary numerical field computations to determine the equivalent material properties of the wound region.
Deletions:
Continuum Representation of Wound Coils via an Equivalent Foil Approach
May 1, 2008
Continuum methods for representing skin and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the approaches described in the literature require preliminary numerical field computations to determine the equivalent material properties of the wound region.
Edited on 2008-05-04 22:38:38 by DavidMeeker
Additions:
In contrast, FEMM implements a model of proximity and skin effects in magnetic problems that takes no special effort on the part of the user. The user merely specifies a wire size and material for a winding, and the program automatically takes skin and proximity effects into account in the solution for the magnetic field and in all subsequent post-processing calculations.
Deletions:
In contrast, FEMM implements a model of proximity and skin effects in AC magnetic problems that takes no special effort on the part of the user. The user merely specifies a wire size and material for a winding, and the program automatically takes skin and proximity effects into account in the solution for the magnetic field and in all subsequent post-processing calculations.
Edited on 2008-05-04 22:38:13 by DavidMeeker
Additions:
Continuum methods for representing skin and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the approaches described in the literature require preliminary numerical field computations to determine the equivalent material properties of the wound region.
In contrast, FEMM implements a model of proximity and skin effects in AC magnetic problems that takes no special effort on the part of the user. The user merely specifies a wire size and material for a winding, and the program automatically takes skin and proximity effects into account in the solution for the magnetic field and in all subsequent post-processing calculations.
Under the hood, FEMM uses an approximate but closed-form expressions for the equivalent conductivity and permeability of regions filled with hexagonally packed round wire, allowing proximity and skin effects to be included with ease in 2D AC field computations. A paper is available that explains the theory behind the continuum model of proximity losses and skin effects that is implemented in FEMM 4.0.
A similar model is implemented in FEMM 4.2. However, the skin/proximity effect model used in FEMM 4.2 has been tuned via the regression of a large number of finite element runs to improve the accuracy of the model at high frequencies, especially for coils with very low or very high fill factors.
Deletions:
Continuum methods for representing skin and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the existing approaches require preliminary numerical field computations to determine the equivalent material properties of the wound region. Internally, FEMM uses an approximate but closed-form expressions for the equivalent conductivity and permeability of regions filled with hexagonally packed round wire, allowing proximity and skin effects to be included with ease in 2D AC field computations. Essentially, the user specifies a wire size and material properties for a winding, and the program automatically takes skin and proximity effects into account in the solution for the magnetic field and in all subsequent post-processing calculations.
A paper is available that explains the theory behind the continuum model of proximity losses and skin effects that is implemented in FEMM 4.0. A similar model is implemented in FEMM 4.2. However, the skin/proximity effect model used in FEMM 4.2 has been tuned via the regression of a large number of finite element runs to improve the accuracy of the model at high frequencies, especially for coils with very low or very high fill factors.
Edited on 2008-05-01 14:09:19 by DavidMeeker
Additions:
A paper is available that explains the theory behind the continuum model of proximity losses and skin effects that is implemented in FEMM 4.0. A similar model is implemented in FEMM 4.2. However, the skin/proximity effect model used in FEMM 4.2 has been tuned via the regression of a large number of finite element runs to improve the accuracy of the model at high frequencies, especially for coils with very low or very high fill factors.
Deletions:
A paper is available that explains the theory behind the continuum model of proximity losses and skin effects that is implemented in FEMM 4.0. A similar model is implemented in 4.2. However, the skin/proximity effect model has been tuned via the regression of a large number of finite element runs to improve the accuracy of the model at high frequencies, especially for coils with very low or very high fill factors.
Edited on 2008-05-01 14:08:47 by DavidMeeker
Additions:
May 1, 2008
Continuum methods for representing skin and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the existing approaches require preliminary numerical field computations to determine the equivalent material properties of the wound region. Internally, FEMM uses an approximate but closed-form expressions for the equivalent conductivity and permeability of regions filled with hexagonally packed round wire, allowing proximity and skin effects to be included with ease in 2D AC field computations. Essentially, the user specifies a wire size and material properties for a winding, and the program automatically takes skin and proximity effects into account in the solution for the magnetic field and in all subsequent post-processing calculations.
A paper is available that explains the theory behind the continuum model of proximity losses and skin effects that is implemented in FEMM 4.0. A similar model is implemented in 4.2. However, the skin/proximity effect model has been tuned via the regression of a large number of finite element runs to improve the accuracy of the model at high frequencies, especially for coils with very low or very high fill factors.
Deletions:
December 31, 2006
Abstract
Continuum methods for representing skin and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the existing approaches require preliminary numerical field computations to determine the equivalent material properties of the wound region. The present work derives approximate but closed-form expressions for the equivalent conductivity and permeability of regions filled with hexagonally packed round wire, allowing proximity and skin effects to be included with ease in 2D AC field computations.
Edited on 2008-05-01 14:00:43 by DavidMeeker
Additions:
- Mathematica Notebook and FEMM models used to create the figures in the paper (FEMM 4.0).
Deletions:
- Mathematica Notebook and FEMM models used to create the figures in the paper.
PDF Printout of Mathematica Notebook.
Edited on 2006-12-31 16:26:19 by DavidMeeker
Additions:
Edited on 2006-12-31 12:55:03 by DavidMeeker
Additions:
David Meeker
Deletions:
David Meeker
dmeeker@ieee.org
Edited on 2006-12-31 12:54:11 by DavidMeeker
Additions:
David Meeker
dmeeker@ieee.org
December 31, 2006
Oldest known version of this page was edited on 2006-12-29 21:35:05 by DavidMeeker []
Page view:
Continuum Representation of Wound Coils via an Equivalent Foil Approach
Abstract
Continuum methods for representing skin and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the existing approaches require preliminary numerical field computations to determine the equivalent material properties of the wound region. The present work derives approximate but closed-form expressions for the equivalent conductivity and permeability of regions filled with hexagonally packed round wire, allowing proximity and skin effects to be included with ease in 2D AC field computations.