The Ossie motor

[gyulasun]

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, could it be that the rotor magnets push the air into the openings of the coil bobbin where the toroids start vibrating due to this?

Maybe holding a ventillator above the rotor and orienting it vertically down so that the direction of the air from the magnets themselves would surely change to another direction, downwards, surely away from the openings.

Or try to stuff in some elastic plastic 'folie' to cover up the opening of the bobbins, to prevent entering much less air.

rgds, Gyula

[Magluvin]

Was thinking about the reeds in the circuits shown. If the reeds do not disconnect at exactly the same time, the diodes wont conduct properly.  A way to avoid this is, they make DPDT reeds. This would be easier for tuning and most assuredly, they would be as close to on and off together better than anything else.
Now if we were not using just 1.5v to power the thing, 1 regular reed could turn on and of 2 mosfets in place of the 2 reeds. And Mosfets can be paralleled to get super low on resistances, and some are very fast switchers.
I have a few old Soundstream amplifiers, that in their power supply, it switches a 3 turn primary on a toroid transformer at 60khz, weel above audible freq. And the 3 turns are 2 phases of 3 18ga wire in parallel. it uses 4 50amp 60v fets in parallel on each phase of primary. That is pretty darn fast if speed is a concern, handling 200 amp load, if it even needs to be that much. I have been running 1 IRFZ44 in my latest circuits and it works great for most all I have done with it.  Just a thought.

Mags

[Magluvin]

One more thing.  I see Jim has a lil different config going. in the Ossie motor circuit, I see the diodes are setup to capture bemf but does it also capture normal charge from the rotor? I guess what i am saying is depending on if the coils are setup to push the rotor or pull (opposing poles or attracting) will determining if regular charge is being accepted though the diodes, where as the bemf will be captured either way. In Jims case, he just may have a bit more regular charge happening, not just bemf capture.

mags

[captainpecan]

@ futuristic,
Good call on the nimh graphing.  That is exactly what is going on with the discharge rate!  Thanks for posting it, it's a perfect correlation to my data.


@all,
Well, I have my first dead reed switch for my Ossie Motor.    Only a couple hours further into the run, I saw the rate of discharge turn the corner alright, except it turned the corner in the wrong direction and begin to discharge even faster again.  I stopped the run so I could go ahead and hookup the 2nd set of reed switches to double pulse this motor for the next 24 hr run.  After I could not get it tuned right for the second run, I soon realized one of my reeds on the first set was stuck shut.  The way this motor is setup, it still runs just fine with a stuck reed, but the pulse width is then to wide, and off time.  This does explain why it begain losing energy faster at the end of the run.

I have replaced the reed switch, and hooked up both sets now, but I'm banging my head against the wall because something else is still not right yet to start my 2nd run. It runs, but it is dead shorting the battery somewhere now, because the battery voltage is dropping like rock.  I have narrowed down the problem now so that it does not do it if I disconnect the shottky bridge I made.  Interesting enough, the motor does not run as smooth when the bridge is disconnected as expected, but the battery goes UP in voltage if I let it run for a minute.  Now I am not letting it run like this, just something I noticed when testing the circuit to find the problem.  It would be a reed killer to let it run this way with out any bemf recovery hooked up.  I have not gotten time to pick it apart any further, I may have a dead diode in my bridge now causing the short, not sure yet.

But I did find it very interesting to see that the nimh battery was climbing in voltage with NO RECOVERY CIRCUIT hooked up at all.  This goes along the lines of a post someone posted here with his relay driven Ossie and no recovery diodes.  Sorry I don't remember who posted it yet, I'll look.  Very interesting effect I'm gonna have to play with after I pick up a couple more reeds.  It's to early to say though, because my motor was firing twice per coil pass this time, so it may show the same charging when I fix the bridge.

Here is my run data for the first one.  I will post run data for the double reeds version when I get it fixed. It kinda sucks though, because the data is skewed right at the end of the run because of a stuck reed switch.  The data curve looks to follow the graph of the nimh all the way to the end, but with a stuck reed, I do not know if it was stuck closed from somewhere in the first hour, or the last hour.   I thought I had a decent digical camera to record a vid for you guys, but it's not working worth a crap either now, lol...  I'll try and pick one up soon.

[captainpecan]

Was thinking about the reeds in the circuits shown. If the reeds do not disconnect at exactly the same time, the diodes wont conduct properly.  A way to avoid this is, they make DPDT reeds. This would be easier for tuning and most assuredly, they would be as close to on and off together better than anything else.
Now if we were not using just 1.5v to power the thing, 1 regular reed could turn on and of 2 mosfets in place of the 2 reeds. And Mosfets can be paralleled to get super low on resistances, and some are very fast switchers.
I have a few old Soundstream amplifiers, that in their power supply, it switches a 3 turn primary on a toroid transformer at 60khz, weel above audible freq. And the 3 turns are 2 phases of 3 18ga wire in parallel. it uses 4 50amp 60v fets in parallel on each phase of primary. That is pretty darn fast if speed is a concern, handling 200 amp load, if it even needs to be that much. I have been running 1 IRFZ44 in my latest circuits and it works great for most all I have done with it.  Just a thought.

Mags

You know, I was thinking the same thing last night when I was replacing my reed switch.  I do not have any DPDT reeds to even obtain locally, I have already checked.  But I should be able to modify two of my regular relay style reeds to work in the same manner.  I'm thinking if I wrap the two together with steel wire, and then leave an inch or so of the wire sticking out.  Then I could pull the reeds far enough back to be out of the flux, but the one inch wire will still be in the flux.  This should let the flux travel into both reeds at the same time and not be to hard to tune. I've give it a try!

One more thing.  I see Jim has a lil different config going. in the Ossie motor circuit, I see the diodes are setup to capture bemf but does it also capture normal charge from the rotor? I guess what i am saying is depending on if the coils are setup to push the rotor or pull (opposing poles or attracting) will determining if regular charge is being accepted though the diodes, where as the bemf will be captured either way. In Jims case, he just may have a bit more regular charge happening, not just bemf capture.

mags

In my setup, I'm using a shottky bridge I made.  I can easily see the slowing of the rotor due to Lenz Law both entering and leaving the coils when I don't have the motor turned on to fire.  So I know mine if capturing the rotor energy for sure.  But, I've still got problems with mine and will not be able to play with it again until after work tonight sometime.