The Ossie motor

[Jimboot]

@cp currently running a test.  off & running at 297RPM start of run voltage at 1.403 will report back in 10 mins.

WHen I turned the meter back on after 10 mins the volatge was 1.438 . It then began to drop rapidly with the meter on edit:20secs. Time lapse between this photo & turning the meter back on. I'm not meant to have diodes between the meter & the battery am I? edit Just chkd after 30mins & voltage is is dropping again slowly with the meter on. 1.436 - 1.433. Cycling up & down but there are more 3 than 6 if you know what I mean. My conclusion is that the meter does not necessarily cause voltage rises. As I understand so little about this circuit there are other influences I'm sure I'm missing here.

[captainpecan]

@ Jimboot,
Thanks for running these tests, it will help us nail down what is going on a bit better.  But what I am referring to is not just turning off the meter, I mean to disconnect it from the battery all together for a while, while it is running.  Then measure it for a couple seconds and disconnect it again.   Then compare the results to the times you just left it connected the whole time.  That is what I did, and I am seeing a definite pattern.  But interesting enough, it still does not appear to do it with my nicad or my nimh batteries, just the disposable alkaline's so far.  Like I said before though, it is just a theory that the multimeter could be leaching some juice into the battery.  I'm quite sure there are quite a few things going on here we are not seeing yet, that could be throwing our results all over the place making them hard to nail down.

Also, I still do not think I have quite the same voltage coming from the generator side as the battery pulse voltage.  But I definitely see the effect of the bemf on the rotor when I start it.  I can give it a good flick, which I would guess is about a 400-500 rpm spin with my finger, then when I flip the switch to turn on the pulse circuit, the rotor immediately slows down to operating speed.  So there definitely is current moving back to the batteries from the generator side, or I do not think it would slow down when flipped on as quick as it does.  Lens Law is applying the brakes to a certain degree for sure.  Much more tweaking to do.

[Jimboot]

The amount of voltage does not seem to be a factor in efficient running. Batteries need to be at least 70% capacity to run well. 6VSLA at 3V will not run. It seems to me battery capacity or low voltage is a factor.

[Jimboot]

@CP Can you adjust the orientation of your coils? So all positive sides are closest to the mags?

[gyulasun]

Hi Laurent,

I agree with your 'resume' on the two coil polarity issues. 

In the first case Lenz law is in full effect (and your recovery percentage of 15% may be improved by fast diodes) and it is doubtful to reach higher than unity result, only much experimentation and with some novel ideas, it seems. 

In the second case I think the kickback spikes are a result of even number of flyback pulses that oppose each other.  I mean the -+ +- and again a -+ +- coil polarities work against each other, the flyback pulses 'ruin' each other but if energy cannot be destroyed hence the high amplitude spikes appear and maybe something else we are not aware of yet.

Unfortunately the real energy content of these spikes seems low because they are very narrow, needle-like. To make them stronger I can only think of making them more frequent, increase their number,  but how can you do this?  I think using much more coil pairs (-+ +-) and this involves more switches too.

I think it is useful to discuss the coil polarities as follows.
   In case of +- +- +- +- series connection and with all rotor magnets placed with like poles outwards, you either choose an attract mode till TDC or a repel mode from TDC.
  In case of -+ +- -+ +- series connection and with all rotor magnets placed with like poles outwards, you have to choose alternately attract and repel modes and this needs tinkering with individual coil positionings, to get the best rpm, or torque.

Maybe I am way off with these speculations, I hope I am not and I am ready to learn also. I built some pulse motors in the past, maybe someone recalls Garry Stanley's so called no back emf pulse motor from 2002-2003, he drove his bicycle with it and he was certain of a COP of 1.5-1.6 if I recall correctly. I did not manage to make real output torque measurements on my build at that time so I do not know if Garry's OU claim was correct. Unfortunately nobody else I am aware of has done real output torque measurements on his setup, most of the people have criticised him...

rgds, Gyula

Hello all
what an intersting thread here  full of variable
theres is now 2 congigurations of the coils polarity
1-  the serial one that is for a 4 coils device   - + - + - + - +    which is the original Ossie's device and in this case , if you shortcut the coils you get a very strong BEMF and strong braking of the rotor, I say it is impossible to free wheel the rotor by hand.  And so far i understand,  in this config you have to tune the reed to insert the pulse motorising energy INSIDE the generaitve AC curve.
  And in this case we have to know if the AVERAGE generative energy can overcome the  TOTAL input energy ??
with this config,  on my really crude testing , i  am not able to get more than an average 15 % of generative back energy  have you better results ??

2-  is from Jimbot 's  contra serial config with - + + - - + + -  where the coils are facing eachother. In this config the rotor can be almost free wheeling with shorted coils.  And the extra energy comes only from the kickback spikes  In this config the BEMF  is almost zero  and on the scope a small trace is there but nothing to do with the generative trace.  But the kickback trace are very impressive.
And in this case we have to test if the very strong but very short Spikes (up to more than 200 volts) CAN BE TRANSFORMED in energy to overcome the input energy.
Yep !!!
good night
Laurent