 Using FEMM to simulate coilguns
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TheMerovingian
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Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
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Evgenij wrote ...
The data-table about magnetization of soft iron in this script are the most valuable part. Try to apply them in the your calculations. All coilguns work deeply in a zone of saturation and FEMM-extrapolation will bring essential mistakes. It is true. The curve needs to be prolonged to strong fields area. I do not see sense to compare results of different programs. It is necessary to compare each program and results of experiment. That is to compare first of all the shape of a current of the present coilgun and the shape of a current from a simulator. It is all to do laziness. But it is necessary to do it.
Therefore the greatest interest submit data experiments in the tables. These data should be written down with high accuracy (initial data, speed, and the shape of a current). If to have it is a lot of good experimental data then will creation an exact simulator easily.
I have modified the b-h curve of "Pure Iron" in FEMM, prolonging it up to 11Tesla (using menten-magnetization curve, fitted to the previous b-h curve with least squares method).
An "exact simulator" is impossibile, a 5-10% error must be accounted due to the error of initial measurements.
My simple simulator also was extented to the use of a external b-h curve, modifiable from the GUI
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