its a tiny motor with a hairpin shaft so thr current flips it easily..if you made a bigger version you will have to add proper commutators and slip contacts otherwise the whole set up will create a dead shorted electromagnet ..this is a homopolar motor One thing I don't understand is why the coil spins without inverting the current everytime? I learned that the current should be inverted all the time because the Lorentz forces should be inverted too. Allegedly, without doing this, the coil will flip back and forth. How come this doesn't apply in this case?I made this motor and here are some tips /- 1-> Your coil should be made of somewhat thick wire. The thin coil would not fix . 2-> You can use paper clips instead of aluminium . I have built both. There is no advantage to removing the insulation on half the wire on both sides rather than all the insulation on one side and half on the other. In fact if you remove the insulation on all of the wire on one side, then you are sure to have conduction when the uninsulated part of the opposite side makes contact. It will work both ways but as to what is better, I prefer to remove all the insulation on one side.
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