Newman machine replica

[hartiberlin]

OK, now I understand. There is a back emf that reverses the polarity. http://www.youtube.com/watch?v=9_rvJQb2SDY
But now I don't understand is how a back emf can be while the circuit is open.

Well it is just enough to open the circuit.
Then a spark will jump from the just opened contacts
and this spark is just putting an radio frequency back current spike into the battery.

So you don?t need to reverse the current in the commutator, if you just build a simple
switch -type ommutator.

The spark is doing it all alone.

Surely if you want to have more mechanical output power,
if is helpful, if you reverse the current  inside the coil after 180 degrees
rotation of the magnet.

But if you only energize the coil for around 45 degrees, once per rotation,
when the magnet is aligned inside the coil,
also a single switch type commutator is okay.
It should be best made of copper and graphite
as this gives the graphite oxidation free electron effect into the circuit.

[rst]

Hi all,

What is the best way for build 2hp newman motor ?

The magnet wire size and how long ?

The best magnet ?

[CLaNZeR]

What happened to this topic? Why no-one post results? All go avay? How about your motor Cleranzer? This was topic I did follow long time, now no-one post here. Why?

All of mine killed the battery after a few days, but this was probably down to the commutator not being the correct material.
I still have it out in the shed somewhere and will probably mess around with it again oneday.

So many thing to play with and not enough time as usual!

Cheers

Sean.

[Careica]

All of mine killed the battery after a few days, but this was probably down to the commutator not being the correct material.
I still have it out in the shed somewhere and will probably mess around with it again oneday.

So many thing to play with and not enough time as usual!

Cheers

Sean.

Yes, I see you have many projects 

On what project are you working right now?

I think you should realy try again your Newman motor recharge your batteries, but use like Stefan say cooper commutator and graphite brushes.

Good luck whit your projects.

Reg. Michael (Careica)

[CLaNZeR]

Okay dragged out one of the coils and manged to get some brushes out of a old 240V motor to try.

Much better sparks now .

Here is a video to show.

http://www.overunity.org.uk/newman/CLaNZeRSNewmanReplication7.wmv

I messed around for ages with tape on the axle trying to get the timing right then had a brain wave about bending the axle a little so as it rotates it touches the brush and fires.

Interesting thing was the Battery was 12.08 Volts when I started and I have left it running for the last 15 minutes and the battery reads 12:09 volts. I have seen this before but it has ended going down more than up, so will leave it running and check again later.

I also have some flat AA batteries here and will tape them together later and see if they charge or degrade even more.

Cheers

Sean.