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Registered Member #1350
Joined: Sun Feb 24 2008, 09:07AM
Location:
Posts: 2
Hi all,
I am currently doing my final year project and need to design an electromagnet out of an iron core bar. The magnet is used to levitate an object (approx 2kg) mounted to a permanent magnet. I am stuck at the calculations part on design this electromagnet to suit this 2kg object. What are formulas I need to apply for these calculations? I sincerely appreciate any advices. Thanks.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
I guess you realise it depends on the strength of the pemanent magnet. I sugest you look at doing some smaller scale experiments with smaller coils and weights first.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I have forgotten the formula but it's something like F = k.A.B^2, can't remember the constant k. B is actual flux density, not Bmax for the magnet, you will have to solve the magnetic circuit to determine B. A is the area through which B 'flows'. Must be somewhere on the net.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
There must be a height measurement that they want you to solve for, because at 1mm you only need a small chunk of iron core and no electromagnet for it to elevate a reasonable NIB permanent magnet and 2kg. At 5cm it is another story and I need a several square inch core cross section to support 200g at 70V 2A or so.
Registered Member #1350
Joined: Sun Feb 24 2008, 09:07AM
Location:
Posts: 2
Is there any websites or books which can show me the formulas for designing this electromagnet. The sites I been to are only showing brief descriptions of the levitation kits. I need more in depth details. Thanks
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Electromagnet Design for Magnetic Levitations
