The Ossie motor

[woopy]

@Gyula

thanks a new time . Effectively the amps went dow almost by the half with  4.7 kohm resistor at the collector . Can i try higher resistor value or will it destroy the transistor ?

My tle 4905 is rated at typical current 3 to 7 max miliamps , do you know better one ?

What is this circuit that Tropes mentionned in the above post, do you know it ?

the resistance of all my coils in serie is 55 ohms and the inductance 39 mh.

Now to the last result

I connected the motor to a 12.2 volts (lipo) battery and positionned the Hall sensor to works in attraction mode (it works also in repulsion) 
the motor consumes 10 Milli amps

than i connected a full wave bridge (not shottky) and got a very strong flyback spike. (pix 2)

than i connected a big cap 10000 micro F 100 volt to the bridge. And there the cap charges up to 50 volts  in half an hour and went up to 56 volts.(pix 1)

the charge consume a lot of miliamps very shortly (some seconds)  until the cap was at 12.5 volts than until the 56 volts   charging process DO NOT TAKE ANY MILIAMPS  at the motor as if the cap nor bridge was there. I tried to diconnect the cap than the bridge and reconnect it  and the amps stay  at 10 miliamps  steady   The charging process uses only the flyback spike.
pix 3 shows the "wide" usefull  spike  of 2ms

Very interesting what do you think ?

regards

Laurent

[woopy]

hi all

i could set the current at a steady 7 miliamps and the big cap charges to 55.4 volt.

For info with the 12.2 volts battery, the Hall circuit alone consumes 5.6 miliamps   that is to say that the motor itself uses 1.4 miliamps (7-5.6)  and it spins happily at 453 Rpm and can charge a big cap to 55,4 volts.

Not too bad for a crude  wobling CD, some market coils and old HDD reading head bearings and neo ring magnets.

regards

Laurent

[captainpecan]

hi all

i could set the current at a steady 7 miliamps and the big cap charges to 55.4 volt.

For info with the 12.2 volts battery, the Hall circuit alone consumes 5.6 miliamps   that is to say that the motor itself uses 1.4 miliamps (7-5.6)  and it spins happily at 453 Rpm and can charge a big cap to 55,4 volts.

Not too bad for a crude  wobling CD, some market coils and old HDD reading head bearings and neo ring magnets.

regards

Laurent

Yup, your doing great.  You can see what I was saying about how it's not that difficult to charge a cap to 50v or more if your using flyback voltage.  The reason it charges so fast until it matches your induced voltage is simply because of the generator effect of your motor, and the run battery voltage.  But after it climbs over the normal generator voltage, and the run battery voltage, the rest is all flyback voltage.  In a sense you are sort of just filling that cap with the run battery, the generator, and the flyback until it goes over those voltages.  Then flyback only, (hopefully with a bit of added BEMF attached!)  You should have noticed the rpms speed up the higher the voltage on the cap rose until it went higher than the generator voltage also.  At this point, you really are no longer converting the kinetic energy of that rotor to electrical energy anymore, your simply catching the flyback from the run pulses.  If you wish to keep making use of that spinning rotor, you could dump the cap back into the battery once per revolution or so, or maybe use a zener diode.  Then you would not only keep catching the flyback voltage, you would also keep using the motion of the rotor as a generator to keep your battery charged longer. But you would of course still only make use of the generating voltage if you chose a run battery that was less in voltage than what the generator puts out.  The rpms will go down a bit, but you will keep recharging that run battery.  Just a thought.

[woopy]

Hi Captain

thanks for answer  have you some shematic as how to transfer the cap energy back to the run battery or how to use and what for a Zener diode value ?

Is it a way to calculate the power going in the big cap along the time . As the time from about 12.5 to 50 volt was  30 minutes is it possible to deduce some power from those datas ?

Or what would be the datas to register to get the power of those Flyback spikes ?

regards

laurent

[Jimboot]

Ok tried a couple of diff motors last night. I have 3 multimeters but I don't trust any of them anymore I think I have to go & buy a Fluke. Anyway the voltage off the motors is 2.5v but I used my tongue multimeter & there was no buzz so I don't believe the amps are much even tho my analogue meter says they're around 1A.

However using the torch motor I successfully recharged the torch battery. So if I can do that, I should be able to get the charge back into the running battery? Am I doing it wrong? I simply have a diode between the positive of the generator & the battery & the ground of the generator going to the ground of the battery. Thanks.