Eddy Current (Electromagnetic) Brake
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Velocity Electromotive Force Problem This example shows how JMAG can be used for the analysis of an eddy current brake for railcars. The brake shoe is enclosed in a coil, forming an electromagnet. If current is applied when the vehicle is traveling at speed, eddy currents are generated in the rail by means of the velocity electromagnetic force (VXB), producing an electromagnetic braking force. Since the rails are magnetic, the skin layer where eddy currents are generated is very thin when the railcar is travelling at high speed. A fine mesh division is therefore needed in the analysis model, which means that a large number of elements are required for an accurate model. |
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Velocity electromotive force problems had been thought to be unstable and
thus extremely difficult to deal with in a large-scale model. JMAG has
uniquely developed an analysis method to provide solutions to the problems
using a motional coordinate system and iterative calculation. In addition,
modeling is simplified in this example since it is unnecessary to move
the meshes. |
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Animation of magnetic flux density motion The diagram on the left shows the distribution of the magnetic flux density.
It shows how the magnetic flux is dragged by the motion in the direction
of the brake shoe movement. For a more detailed view, see the full animation file (300 kB). |
