The basics of the fluid simulation that I used are straightforward, but I had a very difficult time understanding it.
Part 3 described a method of modeling a core.
In another article, hopefully to be posted before this one, is a means of creating a simple, lossless, nonlinear core model. This article is intended to discuss some core considerations and misconceptions regarding cores.
It does not pretend to be exhaustive or even rigorous, but nonetheless to illustrate some important points in a discussion format.
I am, of course, playing the 'expert' while my friend, the questioner, is speaking in italics. So as I was saying before coffee break, one can learn Little field simulation case lot from a B-H curve of an inductor or from a core model, or its material.
Figure 1 Tape wound core material typical hysteresis loop To a greater or lesser extent, all useful core materials display a curve somewhat similar to this Figure 1.
The curves often have less loss and are narrower. Often they saturate less abruptly, and are more 'S' shaped. This curve is for a tape wound core and is effectively 'gapless', as the core material is a continuous strip of a specially prepared magnetic material.
When this core, or any core material is driven deep into the saturation region, E. Essentially all of the magnetic domains present in the material have been aligned with the magnetic field.
About the origin, in the somewhat steep and linear regions of the curve, there are large numbers of unaligned magnetic domains at any point, and an increase in H will cause a correspondingly linear increase in the number of aligned magnetic domains.
Between these two regions is a transition region. In this portion of the curve, which can be relatively large dependent on the material, the number of unaligned magnetic regions is becoming smaller, and the B-H curve flattens. This region, dependent on the core material, can be rather small or even quite large.
Let me sketch a lossless B-H curve. Figure 2 Typcial Lossless Core This drawing in Figure 2 shows a curve of a hypothetical lossless, saturating core. Such a B-H loop approximates the midpoints of a curve for a material such as a ferrite, which can have a 'skinny' B-H loop, representing little core loss.
The 'flat' top portion can represent an extended transition region, or an air-core, fully saturated region of operation, again dependent on the material.
Some powdered toroid cores already have an inherent air gap distributed throughout the core, in between the many grains of material that constitute the core material. Generally such powdered cores cannot be easily modified, nor is there often a need to do so.
We are often interested in curves of un-gapped material B-H curves. Un-gapped material B-H curves are often provided for materials and core construction types where the air gap can be customer specified to the manufacturer during the ordering process, or the customer can if desired create their own air gap.
The specific cores can be of many different configurations. They could be E-I cores, where the windings are placed on bobbins, placed over the center post of the E shaped block of material, and then the magnetic core 'I' block affixed to the 'E' block which has the bobbin placed on it.Automotive E-coat Paint Process Simulation Using FEA.
This paper was presented at the NAFEMS Ninth International Conference in Orlando, FL, USA on May 29, Carbon Zero Consulting provide a unique service to measure soil thermal conductivity in situ at the intended site of installation of pipework.
Procedures for thermal response testing (TRT) of vertical closed loop boreholes are well known and documented. Design simulation software Continue reading →.
Carbon Zero Consulting provide a unique service to measure soil thermal conductivity in situ at the intended site of installation of pipework.
Procedures for thermal response testing (TRT) of vertical closed loop boreholes are well known and documented.
Design simulation software Continue reading →. A simulation is an imitation of the operation of a real-world process or system. The act of simulating something first requires that a model be developed; this model represents the key characteristics, behaviors and functions of the selected physical or abstract system or process.
The model represents the system itself, whereas the simulation represents the operation of the system over time. University of Chicago. Office of Communications. S. Ellis Ave., Suite , Chicago, IL () [email protected] Since this site was first put on the web in , its popularity has grown tremendously.
If the total quantity of material on this site is to continue to grow.