the Kubikop motor

[DA]

Ok, this one has me stumped.  I can see what he's doing.  He's using the emf from a second winding on the power coil to charge the battery that is powering the motor, and he is ALSO charging a crap battery, he says with the back emf of the reed switch.  The reed switch?

But, he has the system running, showing the voltages on both batteries, no problem there.  Then he dicsonnects the power to the motor, so it stops, and the voltages BOTH go down.

The batteries BOTH have higher voltage when the motor is running, than when the motor is not running.  Usually, battery voltage goes UP when you turn off a motor, NOT down.

My guess is he disconnected the wrong wire, and the motor is really still connected, drawing the battery down.  Pretty well done though.  This guy is really trying to make this work.

http://www.youtube.com/watch?v=OEHLT0ILnhY

what do you guys think?

[tinu]

@DA,

I?ve been there?

Most probably it?s his DMMs that are getting disoriented by the back emf at several kHz.
Check also http://www.youtube.com/watch?v=WldMxxFcE2g
DMM supposition is supported by the above movie, which shows the effect much clearer and which incidentally happens to be among the most recent videos.
Based on the observation that only in the last movie resonance is observed, I?d said the guy has a lot of work ahead.
But otherwise he seems very honest nonetheless and pretty determined to nail it down.
The motor is known as Bedini?s, although almost pc fan is working on the same control circuit (Hall sensor instead of Reed switch but otherwise they are pretty much equivalent).
   
Maybe it?s a good idea to invite kubicop here. Go for it, if interested.
As far as I know many members already had their hand-on experience with this kind of setups and most found there is no energy gain in back emf but probably there are other members who would like to give it a try.

Cheers,
Tinu

[DA]

I hadn't thought the DMM aspect, I agree that is most likely.

I mainly thought it odd that he was charging a battery from the reed switch circuit, which is used to power the transistor, not the coil.  So that would be just draining the 12 volt battery? 

Looks pretty good, if those meters aren't confused.  Does this happen often?

I saw that resonance video.  I see what you mean.

DA

[hoptoad]

I mainly thought it odd that he was charging a battery from the reed switch circuit, which is used to power the transistor, not the coil.  So that would be just draining the 12 volt battery? 

Looks pretty good, if those meters aren't confused.  Does this happen often?
DA

@DA
This sort of "apparant" charging is very common in pulsed circuits. Especially so, when the circuit utilizes a mechanical switch. Granted it seems very unusual when the output is taken from the reed switch, and even more unusual when the reed switch is only used to drive the base of a transistor.

The problem is the use of DMM's in conjunction with mechanical switching. The switch causes sparking, which in turn produces RF emissions. Initially you might think that the battery should suppress this RF, until you realize that the capacitance of the battery in series with the inductance of the coil forms a series resonant antennae circuit which is highly reactive to RF emissions of the mechanical (in this case a reed) switch, and instead of suppressing the effects of RF, actually enhances it.

Many years ago when I built my first Adams motor using mechanical switching, I was enthralled at the apparent immediate gain in voltage of the supply battery. However, as I allowed the motor to run continuously, the voltage eventually began to drop below the initial start voltage. Bemused by this, I switched to precision analogue meters which showed the true battery voltage levels, both when running the motor and when switching it off. Needless to say, I was disappointed by the true voltage readings.

Cheers from the Toad Who Hops 

[DA]

Thanks, that makes sense.