|
|
 |
|
|
Multipolar homogeneously magnetized Magnet with eight Poles
This example is a tutorial showing the basic handling of the software as well as its basic characteristics. The problem which shall be teated here consists of a cylinder made by eight segments of anisotropic ferrite, having a remanence induction of 0.40T each. This tutorial still shows the use of version 2.4 but the use of version 2.5 in relation to the steps below is analogous. The additional features of version 2.5 as well as the functions being shown here can also be learned easily by the extensive help system of PS-PERMAG.
|
|
|
|
 |
|
|
|
After starting PS-PERMAG please select M in the upper symbol bar which stands for multipolar homogeneously magnetized magnets, see below. This opens the input dialog for the data input. Here the basic data of the magnet are given in. Background is always the cylindrical coordinate system, see drawing above. This means e.g. that at half the axial height of the magnet there is always z=0. At zero angle phi=0 there always starts an outward oriented pole. After entering the data simply click the “Go” button in the first symbol bar. The fields will then be computed, while the time progress will be indicated by a progress bar. The typical computation time for the here described example is located around 1s.
|
|
|
|
 |
|
|
|
Now look onto your first results. In the upper symbol bar you should click the first of the four gray buttons, which should have a white curve symbol and which contents the letters r and x. By this a graphical diagram will be shown, which depicts the r- or x-component of the field, as a function of the geometric angle or the path location.. The other gray buttons close to the former one are the remaining components of the field together with the total field value, i..e. the length of the field vector. Instead of showing the full range of the field distribution one can also constrict the range of the diagram by clicking a respective button in the second symbol bar (options bar).
|
|
|
|
 |
|
|
|
The fields can also be watched by numerical listings, which can be opened by clicking on the green buttons in the first symbol bar. The first of these buttons opens the listing of the radial component when cylindrical result coordinates are used. For systems needing cartesian coordinates this button shows the x-component . Clicking the button with the two doted lines in the options bar (second symbol bar), one can change the number of values which PS-PERMAG computes on a chosen path. To finalize such change the computation has to be repeated by using the GO button.
|
|
|
|
 |
|
|
|
Additional evaluations based on the single field components are e.g. Fourier series approximations. In case you would like to have an overview over the approximation of e.g. the radial field by such series, please click in the third bar (evaluation bar) and there on the first of the gray symbols which shows the letter r. Then the original curve together with its Fourier approximations up to specified orders are graphed. Below this is shown for the first two poles after having constricted the geometric diagram angle to 90deg. Which and how many orders are chosen for graphical depiction can be determined by clicking the first button in the options bar. A listing of all numerical coefficients of the Fourier series can be shown for each single field component by clicking on the respective button in magenta. Also the absolute field value, i.e. the length of the field vector, can be approximated by Fourier series.
|
|
|
|
 |
|
|
|
Another sort of evaluations are field angles which are of importance e.g. in sensor technology. In the evaluation bar a click on one of the dark magenta buttons reveals these angles graphically. Below the angle of the field projection in the r-phi plane is shown. The green buttons supply the respective numerical listings of these angles. All angles are defined between -180deg and +180deg. Graph colours can be chosen generally in the options bar as being shown by the respective button and its dialog mask below.
|
|
|
|
 |
|
|
|
To close this tutorial some additional features (here of version 2.4 only) should be mentioned: In the first symbol bar a dialog can be chosen to put in a description of the analysis. The current contents of the screen can be copied to memory to be used in other software, e.g. to be placed into reports or presentations. This can be done by clicking the camera button in the upper symbol bar. Beside the common binary storage of the analysis, which does not only include all primary and secondary results but also the most current user adjustments of the software, in addition an ASCII storage of the fields by using the “txt” button can be performed. Another button of importance is the red button close to the “Go” symbol, which lets you stop a current computation. The options bar, in addition to its already mentioned features, also supplies features like changing the accuracy of computation or giving in and storing your personal data, which will then always be shown on the detailed printouts of PS-PERMAG. The size of the screen view can be adjusted to your demands using the + and - buttons. Three sorts of option buttons handle the storage and recover of the user adjustments of the software. Not to forget: All features, which are usable by the above described buttons, can also be used by clicking on their respective menu commands, which are included into the main menu bar on top of the program window.
|
|
