Permanent magnet assisted motor coil designs

[kolbacict]

Is there a magnetic saturation of the steel shell in your concept ?

[captainpecan]

Yes. I built with it in mind making assumptions. Mostly to test different options to see how it effects it. I entered in the numbers for the magnets I am using at k&j website and it shows that the flux is mostly contained at 2mm thickness. In my mind, it seems that the quicker you cam saturate the metal, the quicker the flux from the permanent magnet releases outward. I made a coil that was thicker at first amd it does appear to take more power to get the same amount of flux projected forward. I have since chosen material 3 mm thick to enclose the magnet. It encloses it well enough to allow a like pole to attract to the core still, while being nearly saturated. Just see like a good figure to continue working with.

[captainpecan]

I have finally gotten the extra magnet wire I ordered. I have been holding up a bit until I could make more coils for the build. Hopefully through this weekend I will have more to show and maybe some numbers.

@any talented circuit builders...
I have other ways to power this motor/generator project of course, but I would like to ultimately use a battery pack circuit. I have been working hard to design some battery switching circuits. I would like to run this motor off of the "split the positive" battery system. It is a set of battery packs I would like to use for all my experiments on other projects as well. Its taking me a whole lot of googling and learning. I have found a way to do it using relays, and maybe it will be perfectly fine for testing and all. But relays being mechanical, just have the part failure issues. I am trying to put together a transistor related circuit that will run a set of 16 or more 18650 batteries. The circuit would constantly switch 8 in series dumping into 8 in parallel through the motor. Assuming an average voltage of 4v on each battery, that would give a voltage difference of 28v to 32v to run devices off of. Is anyone aware of a circuit that has already done this or something similar? Please point me in the direction of another post or something you may have seen I could possibly learn from. I have been kicking around the idea of using a 555 timer  to run something, but I am plenty fine using hall switches near my rotor to make the switching. I have come up with my version of a whole bunch of DPDT relay replacements using mosfets. But I'm not really even sure it would work, or if there is simply a better way to do it. I am playing with it a bit anyway. I only put this out there because there are many very talented people in this forum that just may be able to point me in the correct direction.

[captainpecan]

Well, I got it running!!! I wound some new coils, and ran some individual tests on the new coils. I have found that so far, the more turns of the thinner wire continues to increase efficiency. The less amount of energy it takes per gauss of magnetic field gained. The major drawback is that it requires more and more voltage for extra resistance in the coils. The current draw is very low. To be honest, my watt meter takes quite a bit more energy to even work than this motor takes to run.


At this point, I have chosen to start my tests with 4 coils hooked in series... it is a high resistance and requires more voltage to run. But is where I am starting, as I can switch to parallel and record each step.


The coils I am using are 2600 turns of 30 awg. The coils are 80.7, 78.1, 82.4, and 83.6 ohms each totaling 324.8 ohms for all 4 in series.

I have realized a critical error I made in the design. The coils react much better with the magnets when the coils are not installed in the unit. Therefore, I believe I have the magnets to close together on the rotors. I needed to make the rotor with 4 per rotor instead of 8 per rotor. Or even 6, if I choose to run the coils in parallel pairs. I believe the output would be increased. What I think is happening is that the magnet entering the coil is being slowed down because it is to close when the pulse happens that pushes the leading magnet away. Now of course the force is greater on the 1st magnet but it is reduced by the 2nd. I will be making new rotors as soon as my new magnets arrive.

I have not started recovering any of the energy yet, not even the flyback. This is just getting things running. I'll share more as I can. Wires are a mess and I'm still working on everything. This is just an update of a quick first run.

[Floor]

Thanks...