F.B.D.I.S.S.M - Flux.Boosted.Dual.Induction.Split.Spiral.Motor.

[Honk]

Hey Honk,

You got a fascinating thing goin on here... I've got a couple of questions of course, and maybe an idea or two that might throw a monkey wrench into the mix
See my answers in blue.

1. Would it help the situation if there were 2 of these motors stacked on a single shaft? I.E.
Have the 2nd motor rotated a bit so that the sticky spots do not overlap.
Would having a setup like this decrease the "stickyness" to the sticky spot?
No, it would not help. There would just be 4 sticky spots and four electro magnets to overcome the stickyness.
It would only help if the motors was made in the opposite attraction mode and mounted exactly in the same position onto the shaft to
make use of the same electro magnets that will have to be bent between motors like a horse shoe magnet.
By this setup just two electro magnets is needed to do the jobb in a dual motor.
Right now my focus is to build a single motor.
The dual pancake setup is just to difficult to make and it would take to long time to finish.

2. Instead of using a normal N/S magnet in the rotor, could you potentially replace it with a Halbach array?
I've been surfing this forum for a while now and I don't think I've seen anyone mention using an array as a rotor or
a stator anywhere (correct me if I'm wrong - I've been gone a while).
If I'm reading the info on Halbach array's correctly they are the closest thing we could get to a magnetic monopole...
No, a Halbach array can't be used in this type of motor. A Halbach array constantly switches polarity, that's the nature of this array.
All of the rotor magnets must face the same direction, and all of the stator must must also face the same direction, and there must be
attraction between the rotor and stator magnets, elseway there would be no rotational force due to the gradient slope of the stator magnets.
The rotor magnets seek to find the area with the most flux and this is at the most narrow area between the rotor and stator magnets
In other words, at the very end of the stator magnet array just before the electro magnet.

3. Why use a stainless steel guide for the stator magnets? Will that not affect the magnetic field lines a little bit?
I understand that the effect will be fairly minimal, but in researching magnetic shielding a bit I'd think that there would be some kind of affect.
Perhaps a good quality plastic would be a better idea - I understand that it wouldn't be laser precise, but a good injection mould can do wonderful things
The best would be to use magnetic back iron. This would enchance the flux of the magnets and make the motor stronger.
But magnetic back iron is to soft to be precision cut by laser into these fine tolorances that I need.
Second best is stainless steel. Perhaps hard plastic in certain areas, but I have no access to cut plastic in a good way.
I'd like to add that plain Non oriented silicon steel is the absolutely best choise of material to use as flux enhancing back iron.
It's easy to cut, pretty cheap but is to difficult to get hold of in the specific size and quantity I'll need.
Therefore I have chosen ordinary stainless steel.

4. This is just a pure question for you Honk, because you sound like you really know your stuff
Would a product like Giron (http://www.lessemf.com/mag-shld.html) be of any use in a motor like this?
I.E. inserting it into the sticky spot to change if from a sticky spot to a coast spot. My understanding of magnetic shielding is very limited...
No, if you insert some kind of shield into the sticky spot area you just shift the sticky spot to the magnets besides the old spot.
You see, the sticky spot is nothing more than the strongest flux position between the rotor and stator magnets.
If you take away the sticky spot by inserting a shield, then the magnets next to the shield will form a new sticky spot.
And the magnets always seek to find the area of the most flux.

Thanks for the great work and honest and forthright replies Honk! I look forward to more details so we can all get to building one or 2... maybe 3...
My pleasure / Honk

[acp]

Just to add to  what Honk said about Halbach arrays. They are nothing like a magnetic monopole at all. The "South" part of an Halbach array is just as large as the "north" part. I don't see any particular gain in using an Halbach array in a magnetic motor.   A magnetic monopole would have flux leaving the magnet and not returning.

[Honk]

There seem to be some missunderstandings by some people or newcomers on how the magnets are arranged inside the FBDISSM.
They are simply placed side to side facing the same magnetization direction. The stator and rotor magnets are in attraction mode.
Please have a closer look at the attached picture to see the rotation direction and the magnetization direction.
The movement of the rotor magnets is created entirely by the twist towards the narrow area by the gradient slope of the stator magnet wall.
At the spiral end the closest rotor magnet is tricked into a new loop by the electro magnet and the other rotor magnets is helping to push it.
The free ride rotational twist is calculated to be very strong. I have found it to be 49 ft-lbs at the weakest point and 57 ft-lbs at the strongest.

[Nutcracker]

Honk,
I am going to go out on a limb here and do another post. A rarity for me.  I have been looking at your design, and something struck me that I couldn't let go.  To state for the record, I am a newbe at magnetics, but I know enough to get me in trouble like this.    I have not done a full read of everything so forgive if I suggest something dumb or already implemented.

I am not sure if this will help with the flow of flux to the correct magnet, but I altered your blueprint to show what I mean.

Each magnet on the outside does not seem to be linked to the rotor magnet on the shaft effectively. (could be very wrong here)  To correct this I suggest putting a wire/bar/steel/whatever touching the outside of the stator magnet pole (N) and going in toward the center of the motor shaft.  This would connect (via a brush type connection since that is all I can relate it to in regular motors) to central plates that are positioned to connect/touch the appropriate rotor magnets inner pole (S).  (bad explaining here-- see picture)  The wire would go above or below the rotor so as to not interfere in rotation.

I colored each of the center plates a different color for clarity, but they are identical except connecting to a different magnet.  similar color are the ones that are currently "connected" via a brush type thing. The plates would be spaced such so that as the center rotates, different bars would touch them and allow the flux from a specific stator magnet to flow more easily toward the correct rotor magnet and maybe reducing the pull on the magnet that has already passed it while increasing the pull on the one comming toward it.

This is just a half baked idea that came while reading. It may be total trash, but who knows.

Regards,
Nut

[Honk]

Thank you for your suggestion. I appreciate all input.
But this modification seems to complicate the motor just to much and I dont really see the gain in strength here!?
The steel bares you suggest must be thick enough to carry the flux.
And considering that each magnets is 8cm high would require 154pcs of 4cm high and 4mm wide bars on each side of the motor to carry the magnetic flux.
Seems kind of heavy and bulky.
The only feasible way I know to strenghten the flux path would be to add magnetic back iron or silicon steel onto the stator magnets outside.
It's not neccesary to have a return path for the magnets. Back iron is enough and I have already planned to use back iron on the rotor magnets.
If you haven't seen this type of motor run I suggest you have a look at this video. It might give you a hint on how it operates.
http://freenrg.info/Sprain/Paul_Harry_Sprain_magnet_motor.avi