Hi all.(adsbygoogle = window.adsbygoogle || []).push({});

I am shortly to begin work on my engineering FYP in automatic control and I'm hoping for some advice to point me in the right direction. The project will initially be an electromagnetic suspension rig (cylindrical winding with soft core suspending a permanent magnet below it via feedback control). I then want to try to acheive off-axis suspension by using 2 or more windings side by side.

What (I think) I need to do to model the system is

1. Describe the B(?) field due to the coils accurately both on and off the axis

2. calculate the total force on a magnet of given strength and orientation placed in the field by integrating over it's volume.

3. repeat the above 2 steps for the permanent magnet's field acting on the electromagnet's core.

I'm looking for the best approach to take. I've found the Biot-Savart law but I'm unsure how it deals with the effect of the core. I've also found equations for B due to a magnetic dipole here but I think modelling the electromagnet as an ideal dipole will be an oversimplification as the air gap is going to be smaller than the size of the electromagnet?

Any pointers would be greatly appreciated. I know I've got a fair bit of learning to do which is fine, it just helps to know I'm going in the right direction.

Many thanks in advance

Pdub

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# Characterise Magnetic Field Outside Electromagnet core

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