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# Linear motors watch

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1. I want to build a linear motor, powered by a DC source, probably batteries, somthing like a metal pipe with a coil round with a small magnet down the middle, any idea if this'll work, or have any more info which isnt obious from a google search
2. (Original post by cobra01977)
I want to build a linear motor, powered by a DC source, probably batteries, somthing like a metal pipe with a coil round with a small magnet down the middle, any idea if this'll work, or have any more info which isnt obious from a google search

The greatest problem will be to cause the current to flow through the coils at the right moments. This can be done by letting the magnet close an open-circuit when it is at the appropriate position.

On the inside of an isolating pipe (made out of pvc or polyethylene or some other isolating material) draw one long conducting non-isolated wire along its surface. On the opposite side of the coil you should drill a series of holes such that the holes come in closely spaced pairs with greater spaces between them.

Now you winde the coils directly before a pair of holes and let the end of the wire which is closest to the hole form a contact stift inside the pipe by pulling it down the closest hole and up the one slightly further away making a not to atatch it there (it will be easier to get the wire up the second hole if you bend it slightly at the end before pushing it down the first hole)

The interior of the pipe is supposed to look something like this:
- - - - - - - - - - -

The other end of the coils should be directly connected to a pole of a battery. The other pole of teh battery should be connected to the long wire running through the pipe.

Now, when the magnet touches the part of a coil which is inside the isolating pipe, current can travel from one pole of tht battery, through the magnet and through the coil (as you can see this implies that the magnet is electricly conducting). If you place the magnet with the propper end first in the propper end of th pipe this will cause the magnet to constantly be reppeled by a magnet directly behind it.
3. Here is a picture of how I think it might be done...
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