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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?

enter image description here

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closed as unclear what you're asking by Neil_UK, R Drast, RoyC, laptop2d, Sparky256 Jan 18 '18 at 1:11

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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

AWG gauges and their current ratings

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  • \$\begingroup\$ 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? \$\endgroup\$ – M6Gpower Jan 9 '18 at 19:09
  • \$\begingroup\$ 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. \$\endgroup\$ – Bruce Abbott Jan 9 '18 at 23:03

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