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I'm trying to make a simple DC motor (nothing serious), I bought varnished copper wire (0.5 mm/22 AWG but don't mind buying more or different gauge if necessary). I made a simple magnet with 4 or 5 AAA batteries (6 - 7.5V), using the entirety of the copper wire (10 m). I was wondering if their were a formula that I can input data into its variables to trying a figure out which would be the cheapest electromagnet I can make that will fit my DIY DC motor.

Possible variables are: Voltage of the source, diameter of the wire (gauge), length of the wire, number of turns of the wire (maybe also depending of the diameter or shape - circular or flat - of the turns).

Note that I have a multimeter (measuring voltage, resistance, current). But do not own and impedance-meter (if it is ever needed). I also have ferrite magnets for the DC motor (but they won't help figure out my wire concerns if I'm not mistaken).

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  • \$\begingroup\$ The mechanical design, especially the magnetic paths is more important than the electromagnetic. \$\endgroup\$
    – Mattman944
    Commented Nov 1 at 0:05

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If this is just for a demonstration then just make many turns, more turns will run slower with more torque.

Fewer turns will run faster and use more current.

20 turns is probably a good starting point.

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