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The Bath Cube Experiment (T.E.A.M. Problem 5)

Miscellaneous with MagNet for Solidworks

Four aluminum blocks are spaced symmetrically between the poles of an electromagnet. A MMF of 1000 A-Turns is applied between the upper pole (the "Pole") and the lower pole (the "Box"). The magnetic field is then measured along contours on the surface of the box.

Using SOLIDWORKS, the device is easily modeled. An AC (time-harmonic) simulation is performed to examine the eddy-currents.

The following is based on the Testing Electromagnetic Analysis Methods (T.E.A.M.) Problem #5: The Bath Cube. The benchmark can be found on the International Compumag Society's website.

B-FIELD INSIDE the TEST RIG

A clip mesh is used to display the magnetic flux density field inside of the experimental apparatus. One coil is wrapped around either side of the test rig, and a sinusoidal current is applied to each coil. The ferromagnetic Pole and Box then behave as poles of an electromagnet.

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MANIPULATING COMPONENTS

MagNet for SOLIDWORKS allows one to manipulate individual components in the field view. Parts can be dragged, dropped, and rotated separately from the rest of the assembly, while still displaying the desired field on all components. This flexibility enables engineers to dynamically see the effects of their design on the magnetic fields produced, even on parts of the assembly that would otherwise be hidden from view.

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CONSTANT MAGNETIC FIELD

A constant MMF of 1000 A-turns is applied between the Pole and the Box. This diagram shows how the B-Field interacts with the aluminum blocks that have been placed in the Box. The direction of the B-Field is shown by the direction of the arrows, and its intensity is represented by the color of each arrow.

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MAGNITUDE: SIMULATION vs. MEASURED

Shown here is a comparison of the magnitude of Bz along the line z=2mm, x=70mm measured in the experiment versus the data calculated by MagNet for SOLIDWORKS. The black bars represent the experimental data, and their length indicates the error in each measurement. The field drops off significantly as the probe moves further away from the center of the apparatus.

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PHASE: SIMULATION vs. MEASURED

Shown here is a comparison of the phase of Bz along the line z=2mm, x=70mm measured in the experiment versus the data calculated by Magnet for SOLIDWORKS. The black bars represent the experimental data, and their length indicates the error in each measurement. The phase changes dramatically as the probe moves underneath one of the aluminum blocks.

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