Electric Motor Secrets

[Archer Newlun]

By the way, How many degrees are your rotor and stator faces?

[Archer Newlun]

Should I continue with the 2 core motor and have a 45 degree offset like yours? I wanted to make my motor about 8 inches in diameter, and 6 inches long. I'm having 1 stator and rotor being made at a professional motor builing shop. They are using M19 silicon steel. Thier website is Proto Laminations' Electromagnetic Web Site, if you want to check them out. Also, since my motor will be a hub motor, the motor should work with the coils on the rotor, and the stator spinning around the rotor, right? Do you have any suggestions for maximizing tourque output while still getting decent recovery numbers? Thanks in advance for your insight, as you have the most perfect example of this motor that I have seen yet.

[Jetijs]

Hi Archer Newlun
Thanks for your interest
I just got my magnet wire today and I am only now starting to wind the coils. Everything else (except the circuit board and timing mechanism) is already done. The air gap will be 0.08mm on each side.
A 3 stator/rotor combo will of course deliver more power, but it will also be harder to make, especially the timing. I am not sure you need that, because you can achieve 100% ON time with just two stator/rotor sets. Also three sets will make the whole thing rather long. Anyway, you should try that out
Good luck!

[Archer Newlun]

@jetijs,
How is you motor coming along? I scrapped the 2-rotor, 2-stator idea and I decided to make a 3-rotor, 3-stator setup with 30 degree offsets. I want to make a hub motor for my Electric Moped. My moped's motor is rated at 1.5Kw, so I want to see if I can make an attraction motor with equivalent tourque output for less power input. I still don't know how to make drawings in AutoCAD I'm learning though. Maybe I'll just put up the crude drawings so you can look at it and tell me if you see something wrong with it. Cant wait to see your progress!!

[gmeat]

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.

Hi Broli,


You may be interested to know that NASA has done some work along these lines with the switched reluctance motor.Heres the work Im referring to.


Performance of Switched-Reluctance Cryogenic Motor Tripled



-Gary

[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 ?

[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.

[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

[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"

[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.

[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

[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,

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.





Can't wait to see this one fly.

Carl

[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.

[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.