electromagnet construction question
electromagnet construction question
(OP)
first of all i would like to appologize if this is in the wrong place. That said, I need help building 2 small opposite pole electromagnets to move a pair of small rare earth magnets back and forth approx. 1-2 inches along a rail.
|e-mag1| -rail--|perm.mag|--rail--|e-mag2|
|<------approx 1.5"------>|
the rare earth magnets I've been using are 4lb pull and 8lb pull. (sorry that's the only info i have on them)
unfortunately, the amount of space i'm limited to is a hollow cylinder 1.5" Inner diameter and about 8"long. and i need the e-magnets to run off a pair of 9v or a couple AA/AAA batteries.
I've been tinkering for a couple weeks but have been getting nowhere. any help would be greatly appreciated.
also, what would be the best type of wire to use for the coil? i have a lot of 20awg copper, silver, and stainless.
for the uninsulated wires, what would be the easiest way to insulate them. time is no concern since i have it in abundance.
thanks in advance for any help.
Joe
|e-mag1| -rail--|perm.mag|--rail--|e-mag2|
|<------approx 1.5"------>|
the rare earth magnets I've been using are 4lb pull and 8lb pull. (sorry that's the only info i have on them)
unfortunately, the amount of space i'm limited to is a hollow cylinder 1.5" Inner diameter and about 8"long. and i need the e-magnets to run off a pair of 9v or a couple AA/AAA batteries.
I've been tinkering for a couple weeks but have been getting nowhere. any help would be greatly appreciated.
also, what would be the best type of wire to use for the coil? i have a lot of 20awg copper, silver, and stainless.
for the uninsulated wires, what would be the easiest way to insulate them. time is no concern since i have it in abundance.
thanks in advance for any help.
Joe





RE: electromagnet construction question
A better solution might be to have a fixed magnetic field and make the coil move along (through) this fixed magnetic field. Have a look at how a loudspeaker works to get the general idea of this.
Also do some research on "linear motors". These go back and forth, not round and round.
RE: electromagnet construction question
my last idea was to use wire with a lower resistance than the copper I'm currently using. The projectile I'm trying to launch with this setup is very low mass, I think <.5g.
the reason I chose this setup was because it would be nearly silent, lightweight and i thought easy to construct.
RE: electromagnet construction question
About the only other way I can see to do this would be a linear actuator that uses a leadscrew that goes through the centre of a motor. That could produce relatively high force with little electrical power, but it would be slow.
Something along these lines perhaps:
http://www.hsi-inc.com/
RE: electromagnet construction question
More turns will help you produce a larger magnetic field up untill a point. Also a marerial used in the core of the magnet will play some part, but with out substantial ampers.
http://en.wikipedia.org/wiki/Electromagnets
I did noth check the equations but they will get you headed in the right direction.