Confirming the Delayed Lenz Effect

[MileHigh]

Just a suggestion for making coils:

Go to the electronics store and buy regular insulated wire spools of different gauges.  Get a nice big spool of very fine wire for sure.  We assume that the spools themselves are regular white plastic spools.  Sometimes the spools have a larger inner diameter so you could add a larger core if you wanted to.  Note the energy storing capacity of the core is proportional to the volume of the core material.  It's arguably more important than the number of turns if your focus is on energy storage in the coil.  I am not so sure that applies for a pulse motor because you assume that you are designing a for maximum rotor push with minimum energy lost per push.  You are probably better off with solid wire also to get the least resistance.  You could also say you are getting a lager cross-sectional area of metal with solid wire as compared to multi-strand wire.

Then for each plastic spool you make two radial cuts on one of the plastic ends about 45 degrees apart and remove the plastic material.  Now you have access to the inner layers of the coil.  You carefully tap into the coil at two or three depths and make connection points.  For example, you could use a small terminal block, the type where you insert the wire into a hole and tighten a screw would be good.  Then you just take hot glue and solidify it all up.  A hot glue gun is the poor man's 3D printer.

Of course you could buy spools of speaker wire and make true bifilar or series bifilar coil configurations also.

Say you buy four largish spools of wire in four different gauges.  And you cut the sides off and you add three taps to each coil.  So that means each coil is four connections, a reference "ground" connection and the three taps.  That would give you effectively 12 coils to experiment with, and you could move your core material from coil to coil.

MileHigh

[Farmhand]

Here's a longer video showing the motor running at low power as well as at higher speed, I ask people to keep in mind that this is a prototype for experimenting and trying things, I don't claim that the setup is made to best specs, that was not my objective. It is to test an idea, weather or not the coils have enough inductance is irrelevant at this point. What is relevant is it spins very efficiently at quite low power and it can spin faster at higher power ( more wasteful) the time for improving the coils will be later. At this point I am testing and improving other things.  Like the single battery running performance ect. There should be no doubt that the motor will run more efficiently with better coils, at the moment I am making new core's with less losses, then i'll wind new coils for the new frame  After more tests I'll know how I want them to behave. I am disabled and can only work at a certain pace, when it rains I get held up as well.    As I said I have code to write, drawings to make, core's to make, coils to wind, a new rotor to design and make as well as a new frame.

I've changed the cap C3 to 2 uF and the inductor L1 to 10 uH since making this video clip, it's thick wire wound on a small toroidal core. Now the voltage spike is a bit higher and the inductive energy is discharged quicker, but it is still not quite right, I can do better. I'll come back to that later for now it works to make the motor faster and more powerful without a second battery, adding a charge battery now degrades the motors performance, whereas just removing the charge battery and returning the inductive energy release
back to the supply previously degraded performance, the difference between snubbing the spike back to the supply and with the inductive energy return circuit is marked.

http://www.youtube.com/my_videos?o=U

Milehigh, I made my main motor coil so that I can join the two windings in series to double the inductance (almost), I have wire for a duplicate coil but it's not wound yet, I'm still using an old coil for the charging coil, the motor coil is two strands of 0.7 mm wire side by side not twisted, at the moment in the two strands are in parallel switched by two mosfets, I can change it but the duplicate charging coil is not made yet. When I have two coils of two strands of 0.7mm wire the same then I'll connect the two strands on each coil in series and have two 24 mH coils still with not much resistance.

At the moment the only thing that warms up is the coil itself and most likely from core losses I think.

When I force it run faster it uses more power as any pulse motor does, they have a sweet speed where they can overcome the windage and drag efficiently, but the point is I can run at the sweet speed with more torque for the cost because of having two driving coils and recycling the energy.

I have more shots but I think it is very obvious that the capacitor C3 can be charged to over 20 volts at the same moment that C2 is at almost zero volts. Once again the blue trace for the motor coil current is inverted (upside down) the current is positive, it's the way the probe is connected.


Cheers

[MileHigh]

Farmhand:

Keep doing your thing at your pace.  My posts are intended more to be stream-of-consciousness for the thread itself.

Cheers,

MileHigh

[Farmhand]

No Probs Milehigh, Yourself and Gyula are correct about the ampere turns. The advice is much appreciated. Parts of my posts are for the general experimenters as well.

Here's another drawing made differently that might help to explain the circuit better, everything is in place kind of thing. Like you said, all is not as it first seems.
When I look now I see that D4 should actually be before C2. I'm going to change that on my circuit. Don't know why I didn't see that before. 

With the generator coil I intend to mount a long core so I can move the coil along the core to maybe observe the magnetization delay, the core will be as big as possible but i'm not sure if I will be able to see the delay on the scope. The coil will have a bucket load of turns of 0.5 mm wire, thousands of turns. 

Cheers

[MileHigh]

A little bit more stream of consciousness:

You have your pulse motor running at it's steady-speed.  I am talking an ordinary Erzatsbedini type pulse motor with the basic circuit.

Here is a simple thought experiment

You run the motor and you scope the coil current and you measure the pulse width and the final current level.  Let's assume you see a typical exponential type rise in the current during the pulse.

Then you remove the rotor and you just energize the coil with the same pulse width.  For example, you connect a signal generator to the transistor base input.

Will there be a difference in the final current level in the coil when it is driving the rotor vs. when the coil is not driving the rotor?

I say there will be a difference, and some might be surprised when I say that the final current level in the coil will be lower when the coil is driving the rotor.  That would seem counter-intuitive.

Here is the explanation:  When the coil is driving the rotor, you know that some of the electrical power you pump into the coil is being exported into the outside world, it is not in fact charging up the coil.

What follows is this deduction:  The power into the coil is just the instantaneous volts times amps.  So you can say that when you drive the rotor, you are taking a "slice" of the voltage (times current) away from the coil charging function and that "slice" is being exported to the outside world.

In other words, if there are 12 volts across the coil, at a given point in time perhaps four of those volts will be "eaten" by the rotor pushing function and the remaining eight volts will be energizing the coil.

So over the duration of the coil energizing pulse, this "voltage stealing" function means that there is less voltage available to energize the coil, therefore at the end of the pulse there is less current going though the coil.

So, how about all that simplified:  This could explain the current draw going down as the motor speeds up.  It all ties into the notion of the motor being seen as a pure abstract "impedance" by the battery and that impedance is actually an electro-mechanical impedance.

MileHigh