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EM.Ferma Tutorial Lesson 6: Analyzing Permanent Magnets

192 bytes added, 22:37, 17 September 2020
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== Getting Started ==
! scope="col"| Plot Type
! scope="col"| Max. Size
! scope="col"| Cone Length Ratio! scope="col"| Cone Radius Ratio
|-
! scope="row"| Sensor_1
| (0, 0, 0)
| | Intensity
| -
| -
| -
| 1.5
| 0.75
| 0.25
|-
! scope="row"| Sensor_3
| 1.5
| 0.75
| 0.25
|}
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Also open the data manager and plot the data file "Sensor_1_Z_HTotal.DAT" in EM.Grid. This plot shows the variation of the magnetic field at the center of the magnets along the Z-axis. At z = 25mm, the magnetic field intensity is 260A275A/m.
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Also open the data manager and plot the data file "Sensor_1_Z_HTotal.DAT" in EM.Grid. The figure below shows that at z = 25mm, the magnetic field intensity has increased to 357A/m.
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== Simulating Permeable Magnets ==
In the previous parts, you assumed that the relative permeability of the permanent magnets was &mu;<sub>r</sub> = 1. Alnico is a permanent magnet material with &mu;<sub>r</sub> = 3.6. Open the property dialog of the group groups "PM_1" and "PM_2" in the navigation tree and change its relative permittivity to 3.6.
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Open the data manager and plot the data file "Sensor_1_Z_HTotal.DAT" in EM.Grid. You can see that along the Z-axis at the center of the two magnets, the field is very much localized and confined to the air gap region and its intensity has increased to a very high value of 634A/m.
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