Emags and Magnetic fields

[BigEvil]

Does anyone know how strong the magnetic field produced by the emag solenoid is?

/have something up my sleeve. :-)

[LorneCash]

you know I was talking to a friend and we were thinking maybe you could change it by adding an additional magnet somewhere... I just haven't gotten around to testing the theory yet.

[BigEvil]

you know I was talking to a friend and we were thinking maybe you could change it by adding an additional magnet somewhere... I just haven't gotten around to testing the theory yet.

Yeah that friend consulted another friend and was told that it might interfere with the processor :-)

However, the friend you are referring too, came up with something else :-)

[Spider-TW]

Are you looking for lbs force or Gauss?

[BigEvil]

Are you looking for lbs force or Gauss?

Gauss. Like I said, im thinking about something, and in doing some researching knowing that would be helpful.

[Chrishew09]

What are you think of...???

If you are trying to reduce the EMI (electromagnetic interference) of the solenoid to reduce the effects on the HES you might have some trouble. The EM field produced by the solenoid is needed to make it function, so if you reduce it the solinoid will not work proberly.....

[JimatAPE]

I wonder what friend gave you any ideas LOL

[Spider-TW]

I think...

Looking at some Ledex specs, they classify their compact noids by % cycle time and the equivalent number of amp-turns. The field of the coil fights the rise of the input current, while at the same time the armature or core is starting to move, changing the distribution of the field. Since the field on a noid is not constant until it has reached steady state electrically and physically, I don't think you will find good numbers for gauss, unless you treat the noid coil as just a coil, without a moving core. Perhaps you could change the other side of the problem to amp-turns or lbs force?

Transient magnetic field modeling used to be a real pain, but you might be able to still get a free 'academic' version of ANSYS, which I think would do it.

[BigEvil]

Actually, that is way more than I need. Basically, I need to get an idea of how strong the field is at maximum. I believe a Gauss number is what im looking for. Once I get that I will know if im chasing my tail or not.

[cockerpunk]

it would be cool to use that magnetic feild to trip your hopper. like an intelli or RF chip thang. the problem is that inductors (what you would use to pick up the feild) are fragile and tend to be pretty large.

[PsychoBaller]

Randomly stumbled into this thread... read last couple o lines... mind exploded

[athomas]

Does anyone know how strong the magnetic field produced by the emag solenoid is?

/have something up my sleeve. :-)

You could probably use a hes switch with a known tripping point. Position it at various known intervals and fire the emag. Find the exact farthest location that it trips the hes. Use that distance and the tripping value of the hes and you should be able to figure out a calculation for the magnetic field.

[Miscue]

Does anyone know how strong the magnetic field produced by the emag solenoid is?

/have something up my sleeve. :-)

It's strong enough to trigger the HES sensor... even if you put the sensor a couple inches forward.

As far as numbers go... I dunno.

[TnDeathInc]

placing a magnet in a figertip of a glove would be intersting

[PumpPlayer]

CP, it's easy enough to just intelliframe or RF off of the board without having an independent system tripped by the solenoid flux field.

As for "removing" the field created by the solenoid as Chris states, you don't need to do that. If you're trying to eliminate interference, all you need to do is give the flux a more favorable path and it'll saturate that without interfering with your other nearby systems. Attach a few strips of plain iron around the outside of the solenoid and that should soak up any stray flux quite nicely. For something more serious than millisecond bursts of 16VDC you can move up to a farraday cage type system to shield from EMF.


I'm just thinking what in the world you could possibly need to use the flux from the solenoid for when you've got all the circuitry and/or current signals available to get the job done.


Maybe you want to:
* Turn the HES around, facing the solenoid
* Piggyback (in series) the HES with a microswitch to trigger the gun
* Fire the gun once with the microswitch, the flux from the solenoid hitting the HES keeps the gun firing

But assuming it all works, how do you STOP firing?
Seems like a software solution would be a better idea.


Or maybe you've got a different project in mind?