# Electromagnet Wire/Voltage/Magnets? [closed]

I have some questions about my project. I want to make a big electromagnet, the size is about:

Outer Ring:

• 50-70cm Height
• 35cm Diameter

Inner Ring (The Movement):

• 32cm Diameter

Now:

1. is it OK to use 1mm copper wire?
2. How much voltage do I need for a nice movement?
3. Must the inner ring be a whole magnet, or is it OK to make many small magnets on the inner ring?

## closed as unclear what you're asking by Neil_UK, R Drast, RoyC, laptop2d, Sparky256Jan 18 '18 at 1:11

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• what does this mean? for a nice movement – jsotola Jan 9 '18 at 7:11
• you need an iron core for the electromagnet – jsotola Jan 9 '18 at 7:12
• So for the inner ring , no magnets just an iron core ? – M6Gpower Jan 9 '18 at 7:14
• A silicon steel core, or ferrite if the OP is rich enough... – Sparky256 Jan 9 '18 at 7:14
• There is no budget given so no worries there!! – Solar Mike Jan 9 '18 at 7:32

is it okey to take a 1mm Copperwire?

Yes. A single layer 60cm long will have 545 turns and need 600m of wire.

How much Voltage do i need , for a nice movement?

13 Volts. The coil will draw ~1 Amp. The movement will be very nice (synonyms: enjoyable, pleasant, delightful, entertaining, amusing). You could use up to 65V (which should draw 5A) but the coil will get hotter and the movement could get quite ugly.

Must be the inner Ring be a whole magnet or is it ok , to make many small magnets on the inner ring?

It's OK to put many small magnets on the inner ring - if you can get them to stay there. The magnets should all be oriented in the same direction, eg. north pole up, south pole down.

Resources used for calculations:-

Solenoid calculator

• Thank you for the very good answer ! -That is huge length of wire, is it possible to use a 2-5mm Copperwire with 12v and i will still get the nice(smooth) movement or how is it with the movement? Do i need for a bigger wire more voltage or less? I think the current is the point for the movement right? – M6Gpower Jan 9 '18 at 19:09
• Magnetic field strength is proportional to both current and number of turns. Stronger magnetic field creates more force and faster movement. Current is determined by Ohm's Law (I=V/R) and so can be increased by raising voltage and/or using thicker wire. However increasing current and/or voltage also increases power and heating (P=IV). If the coil gets too hot it will melt or burn. – Bruce Abbott Jan 9 '18 at 23:03