Newman machine replica

[TheOne]

nice replication!

[hartiberlin]

Hi Sean,
very well done.
Good video quality !
Please for a better recharge effect of the battery,
shortout the ampmeter , when you are done with measureing
and it might help to use thicker and shorter cables.

Your motor seems to run only on less than 5 milliAmps..
Maybe you have a better scale ampmeter, so we can really see the input power ?

Yes, try now to get a 1 to 3 Watts bulb and put it into series with the battery and shortout
the ampmeter.
Probably at this low input current you also have a very low RF output, so it maybe needs to go to
higher input voltages to see the bulb getting light up.
But it seems you have quite some nice torque already at the rotor axis, right ?


Many thanks.

[Eddy Currentz]

Here?s a motor I put together in the last few days. I originally put in on a lead acid battery and the voltage didn?t change a bit. Then I stuck a 9V on it and it has been running for over 8 hours now. The voltage is down about a volt but not bad for a motor of this size.



I used almost 3000? of 20ga wire for the coil. I had a big old donut magnet kicking around so I used that for the rotor. The frame is from a cable spool and I used some 3/8? bearings and mounted them in two blocks of wood.
This motor is a kick! I?ve built about 5 Bedini motors but this one is so simple that it?s cool.

Here?s the magnet. It fits pretty snug but turns without any rubbing.



I made a short video of it and posted it here:

http://www.youtube.com/watch?v=K7C4V6WXvkM

[hartiberlin]

@Eddy Currentz
well done !

Now if you go substitute the microswitch
with some better commutator contact points, which
will spark more, then you would get a better recharge effect
into the battery.
Is this a rechargeable NiMh 9 Volt battery ?

You might also want to put 2 x 9 Volts or up to 10 x 9 Volts batteries in series
for higher speeds and use an additional 1 to 5 Watts incandescent
bulb in series to see, if you can light it up from the generated RF
power at the commutator.

[Eddy Currentz]

@Eddy Currentz
well done !

Thanks. It's not the highest quality construction, I just cobbed it together at work with what I had.

Now if you go substitute the microswitch
with some better commutator contact points, which
will spark more, then you would get a better recharge effect
into the battery.
Is this a rechargeable NiMh 9 Volt battery ?

No, it's a regular alkaline battery. But I have seen today that the term "rechargeable" can certainly be applied to normally nonrechargeable batteries with this motor.
Commutators are a trade off. You can get great sparking with a couple of wires slapping a buss bar, but the copper oxide and carbon will quickly build up and ruin the effect without regular cleaning. A microswitch will last much longer and does produce some arcing across the contacts. It's hard to get good consistent arcing without degradation to the contacts. I have a carbon brush commutator that I used on another motor that I may try.

You might also want to put 2 x 9 Volts or up to 10 x 9 Volts batteries in series
for higher speeds and use an additional 1 to 5 Watts incandescent
bulb in series to see, if you can light it up from the generated RF
power at the commutator.

Thanks, I will definitely try what you suggest here. First I want to rebuild the rotor since it has a lot of drag on it right now. I'm going to remount the magnet and straighten out the axels. I also want to mess around with the timing since I only took a couple of minutes to get this going this morning.
These motors are great fun.   

Ted