21
Do you mean to use it to magnetize objects?
this post was submitted on 06 Sep 2023
21 points (100.0% liked)
Ask Electronics
3316 readers
2 users here now
For questions about component-level electronic circuits, tools and equipment.
Rules
1: Be nice.
2: Be on-topic (eg: Electronic, not electrical).
3: No commercial stuff, buying, selling or valuations.
4: Be safe.
founded 1 year ago
MODERATORS
That’s correct!
Putting a tool in a powered coil will magnetize it temporarily but I don't think it will stay magnetic or at least not for long. They sell little magnetizers that you can get cheap that will last a lot longer though if that's what you're looking for..
I have one like this around somewhere that worked well when I tried it.
Depending on the coils number of windings, and the size of the tool it will magnetise it pretty well. I used to do this to screwdrivers before they came pre-magnetised. And they will stay magnetised for a very long time.
Most of the time the reason for becoming demagnetised is due to dropping the tool several (many) times.
I've had good results discharging a 450V 1kJ capacitor bank through several turns of 10 AWG wire. If you don't have a capacitor bank laying around, one of those magnetizers will work just as well.
I appreciate it, I didn’t realize it was so temporary
Really? If have had good results just placing a screwdriver inside an electromagnet, still magnetized a few years later.
Maybe it depends on the coil/power source. When I tried it I was just messing around with a coil I had and 12v source and it was not that effective.
You will need to feed it with DC.
What you're asking is not very clear, but I'm assuming this?
Apologies for not being clearer. What I mean to describe is a magnetizer - something that you might put a metal tool through to make it magnetic
Or you could pick up an iron rod and strike a firehydrant like MacGyver.
I magnetize screw drivers with just a normal magnet. What's your usecase to need such a big magnet?
I just wanted to recreate the device my dad made with me as a kid
Fun stuff
Any strong magnet can magnetize other things, depending on the material. Iron can be relatively easily be magnetized, while neodymium magnets require a huge (but obtainable) field.
That looks like a big electromagnet, from a motor, it will probably work, but you have to feed it DC, not AC. (Or else the object will be demagnetized when removed)
Thank you for your insight! I am getting closer!