This will seem like a stupid question at this point, but when i use the area of the pole to calculate the force do i use the area of the core or the area to the outside of the wire (using multiple layers)??
Thanks guys. but I'm a little confused about the relative permeability. I'm under the impression, from everything I've read, that using an iron core should increase the magnet's strength by a lot. Why in this arrangement does the iron have the same relative permeability of air??
sorry for the multiple posts, but I've done some more work and slightly redesigned the magnet. I will need a relative permeability of either 53.6 or 6.8 depending on if I use .533 amps or 4.2 amps respectively. Could someone tell me if this is possible with the following magnet criteria?? The...
marcusl,
thanks a lot. i had found another site that said mu was around 200. wikipedia has it at 5000
Is there a way to find out how big the magnet needs to be (how big the core needs to be) in order to get a higher value of B?
To give you an idea of what I am doing (i should have...
NoTime,
I took the values listed, beginning with mu(air) and ending with L, and plugged them into the equation for B. I then used the answer I got for B (listed) and plugged the necessary values into the force (F) equation, which yielded the 1,204.97 lbs. Is there something in the...
Thanks for the responses guys. I figured that's what was wrong. I did a few calculations, but the attractive force of the electromagnet seems way too high (it would be great if it was correct, but i don't think it is). The equations I found are as follows...
The size of the core is approximately 1" in diameter (I am limited by space so the core must be small). You mention getting rid of the welding wire. The wire I have is enamel coated magnet wire, but it is the larger diameter.
I am trying to create an electromagnet that will repel another magnet when activated. Currently, I am using a 12v battery with 7400 mAh. For the coil I am using copper wire of AWG 9 and 12 (I am experimenting with both sizes). I have also tried air and iron cores. However, I have run into a...