Help with building an electromagnetic motor?
The two outer wires are both rotated clockwise. The wire in the middle is also rotated clockwise and then taped to the glass tube. The outer wires aren't taped to it but just touching the wires in the middle. Everything seems alright but the motor is not working. Please help.
Answer:
I tried making a motor like this when I was a kid, back in the '70s. It too, did not work at first.
The most likely problem is that you need more magnetomotive force (MMF), and less friction.
To get more MMF, get a higher voltage source, so you can drive more current through the same windings, or add turns to the windings, or both.
Also, check the brushes (the slip connections on the rotor), since these can be a source of headache on this series DC motor. They need to make firm sliding electrical contact with the slip rings.
If it will keep going after you spin in manually, that means you have fundamentally made the windings correctly, but friction (and lack of MMF) is keeping it from starting.
This is not really a great learning example, because it usually just frustrates kids and they go back to playing games or watching TV. The stator nails should be pointing in at the rotor, instead of pointing perpendicular. Also, it would help to use more nails, since this gives the windings a bigger core.
Good luck, and be sure to use a potent battery.
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