Electric Motor Secrets

[Jetijs]

Hi aladinlamp
The rotors are pressfitted on the shaft with some bearing glue between the rotor and shaft, should work great.

BTW, a little update. I have finisged my motor endplates. Now I just need to get the bearings, make four bearing holders and wind the coils

[Peter Lindemann]

Awesome, as usual!

Jetijs,

Awesome work. Don't forget to take a little time to relax and enjoy "not doing" during the Holidays. Relaxation is the Key to Higher Perception... you know.

Best wishes always,

Peter

[Jetijs]

Yes Peter
Now I know that
Thanks.
I have been thinking about the switching circuit of this motor. I recently watched again a video that Steven (nali2001) posted many posts ago with his core tests. In his tests he used different core materials and found out that the usual transformer cores retain residual magnetism if some DC pulses are used to create a magnetic field. In the attraction motor we have only DC pulses and the same magnetic poles on each pulse. It could be that because of this, the stator cores are not demagnetizing fully and this reduces the efficiency. So maybe for the new version we should develop a circuit that changes the polarity of the current flow on each pulse, so that in one pulse there is an N pole created and on the next pulse there is an S pole and so on. What do you think about that? Shouldn't bee too hard to modify the circuit to achieve this, right?
Thank you,
Jetijs

[Mark]

Most impressive work Jetijs! I am looking forward to hearing more after you get it running. Excellent work!

[Peter Lindemann]

Perhaps!

Yes Peter
Now I know that
Thanks.
I have been thinking about the switching circuit of this motor. I recently watched again a video that Steven (nali2001) posted many posts ago with his core tests. In his tests he used different core materials and found out that the usual transformer cores retain residual magnetism if some DC pulses are used to create a magnetic field. In the attraction motor we have only DC pulses and the same magnetic poles on each pulse. It could be that because of this, the stator cores are not demagnetizing fully and this reduces the efficiency. So maybe for the new version we should develop a circuit that changes the polarity of the current flow on each pulse, so that in one pulse there is an N pole created and on the next pulse there is an S pole and so on. What do you think about that? Shouldn't bee too hard to modify the circuit to achieve this, right?
Thank you,
Jetijs

Jetijs,

High quality transformer laminations de-magnetize completely, so the problem (if it arises) is a matter of materials. IF the effect shows up, you can certainly try what you are proposing as a remedy, but I would think it will not be necessary. Your experimental results will tell the truth.

It is always good to be thinking ahead, but don't act on it until REALITY tells you it is necessary.

Peter

[Beshires1]

Jetijs,

alternating the poles, will still give you North and South pulses occurring on the same stator pole in the revolution. Because you have a even number of stator poles. If you had five poles on the stator or even 3 poles on a stator the poles would alternate with the pulses.

[Jetijs]

Beshires1, what does the number of stator poles has to do with the magnetic polarity of those poles?
In my previous motor the wiring was something like this:



This way there will always be the same polarity magnetic poles on the stator poles. And if the tests will show that the material does not demagnetize fully, we will have to make a circuit that reverses the coil polarity on every second pulse.

[hh1341]

Jetijs,

So good to see you are back working on your motors.

It warms my hart to see a version of my shutter idea adapted to your design.

Vari-Shutter EX 1.jpg

Vari-Shutter EX.jpg

Can't wait to see this one fly.

Carl

[Jetijs]

Hi Carl
Thank you for reminding me about the shutter idea
I was going to use a timing device that is something like that I have on my genset, I mean like this:



This allows quick and easy timing adjustment on the fly, but this does not allow me to adjust the ON time. Your idea solves that very easily With my last setup I had to machine a timing wheel for each ON time variation I needed, but your idea will solve this
Thank you!

[hh1341]

Jetijs,

It is my pleasure to be of help, you are more than welcome.

Thank you for all your work.

I'm looking forward to this new version.

Carl

[cody]

Jetijs,
I have been modifying my motor to alternate from north to south as well, but for a different reason than demagnetizing the core material. Someone correct me if im wrong here but these motors are suppose act as a triggering device to hit resonance in the coils correct, at least thats what i see with my motor. Resonant circuits have a capacitor in series or parallel with the coil to achieve the best resonants. Unipolar pulses would allow a cap in parallel but alternating pulses would allow a cap in series, and you have seen the success gotoluc has had with a cap in series with resonant circuits.

[mlurye]

@Jetijs. To adjust timing I would recomend to use 555 timer. Check this tutorial https://homepages.westminster.org.uk...ronics/555.htm.
You need the following section: "More about triggering"

[Jetijs]

Cody, as I am now playing around with resonance, I already had an idea that if I find the resonant frequency of my motor coils, maybe I can try to pulse the LEDs of the optoswitches at that frequency. I don't know how this will affect the recovery side and overall motor function, but it is worth trying

mlurye, thanks for the link, but so far I am happy enough with the circuit lighty gave me. It will need a 555 timer eventually to chop the ON time into pulses of the length that gives the best results. But that is just an easy 555 circuit.

An update of my progress. By a mistake I made the polycarbonate and plates with a hole that is smaller than my bearings, because I did not have the bearings at the time I machined the plates. Had to make new ones. Anyway, they are ready. On monday I will bring both rotors to a machine shop to do some small lathe jobs and I will be ready to assemble both motors. But I am out of magnet wire for now and I can't buy some from the motor rewinding company, because they do not sell it anymore. Will have to order some from ebay and this will take some time. But in the mean time I work on the timing device and circuit board. Still a lot to do
Thanks,
Jetijs

[broli]

I kept thinking and thinking and thinking. This motor is really genius! I came to the realize of using an super simple oscillating LC circuit/tank. To be more exact using the magnetic field of the coil without interfering with it so it can keep oscillating back and forth.



I think Peter's motor can be made to run without any energy at all, even though he's already covering that part already. But I believe you can make a close to perfect oscillator by cooling down both the coil and capacitor to become superconductors without any resistance.

Yttrium barium copper oxide - Wikipedia, the free encyclopedia

This way the setup will oscillate back and forth and the rotor speed will depend on the frequency of this oscillations. Once started you barely need to touch it. Just make sure you don't get near the saturation point of the iron and seal up the super conductor with liquid nitrogen up good. your rotor will spin and spin and spin and you can forget about it .

If I made any stupid assumptions please correct me.

[boguslaw]

I have a question : is it possible to construct from a AC motor such strange device: a stator of AC motor still produce rotating magnetic field , but instead of rotor in centre there is a coil. How such coil must be made to obtain from rotating magnetic field a pure sine wave current inside this coil and not multiphase but single sine wave ?

Do somebody have a simulation program to look what kind of current is produced by rotating magnetic field inside coil placed in field ?