The Ossie motor

[Jimboot]

Here's the vid of my Ossie with Metglas. Just a weird effect which vibrate through the whole table. It is not in the rotor but the grinding sound is coming from the coils. Just found it interesting.
http://www.youtube.com/watch?v=yEcVPJZl11Q

[Jimboot]

Left  this morn with both  going off same d cell. When I got home 20mins ago the Orzy had stopped but the ossie was still going happily at 310rpm with slight v drops. I simply touched the rotor of the orzy and spun up to 400 rpm with no rumble. V at 1221, (meter disconnected except when measuring.) 10mins later voltage had risen to 1236. I'll isolate the orzy in a few hours & report back. A convoluted setup I know, but I'm having a helluva lot of fun! Looking good

[Jimboot]

@ Gyula I was confused about the SAM Motor as he claimed it was a self runner. Surely if it needs batteries it is not a self runner? If you can have a self runner with batteries how long does it have to run before you call it a self runner. I'm just a bit confused about definitions. Will setup some scope shots tonight.

[captainpecan]

Thought I would go ahead and post the data I have so far on my Ossie run.  As a reminder, I am using 1 1.2v 2000mah nimh battery to run it.  The battery started fully charged at 1.354 volts.

The data is pretty interesting indeed.  You can see how the voltage dropped faster in the beginning, but it seems to be leveling off now.  It would seem that it is possibly that the battery being full charged, was just not able to effectively hold as much of the recovery energy.  As the battery goes down in voltage, it would appear that the battery is catching the recovery energy much more effectively.  Hopefully it will turn a corner in the next couple hours and hit the sweet spot where it does not lose energy anymore.

[Magluvin]

Capt
The battery, was it fully charged?  Even if it wasnt, it may still be on the way down to a sort of resting point.
They call them 1.2v but the resting point really doesnt exist  with nicads or nimh because they will drain on their own over time. But above a certain point, lets say 1.2v, they will drain themselves faster from a high till they reach a so called resting point. Once reached, the self draining will be minimum, and this is the time, or place, that the battery will accept a charge from your motor easier because the battery is not as much of a load on the recharge it gets from the motor.
This is why an alkaline battery seems to work better, just because it does. The alkaline has very very little self drain.
Alkalines can be recharged. They just cant be charged hard like a rechargable. Most people dont know this but if you put alkaline batteries in a rechargeable battery charger, they can only take so much heat before they leak, or pop. If, depending on the alkaline battery manufacturer, you put an alkaline battery in the charger for 1/2 hour to an hour, let it cool then repeat, she will recharge many times successfully.

So the charge they get from the motor, as long as they dont get too hot, which they should do fine, should not hurt them.  Rechargeable s waist a lot of energy in the recharging process in creating heat. My nimh bats get so hot when done, I cannot hold on to them. So whether we get more use out of them before throwing them away, the power co. is getting their watts out of it, and they are probably in bed with the battery companies.

Mags