MylowHJ Replication - Discussion

[wattsup]

@vince

Nice build. I like the paper clip idea and will try it also.

@all

It's good to have your systems migrated here from the other thread.

I am putting in two photos of my current wheel using the Pizza Pan. I used neos on top and bottom or neos just on top with hex bolts on the bottom to hold the mags in place. Works great and changing configurations is a breeze. Except when I hit my stator on them and they all fly off. lol

Anyways, this has taught me alot about the magnets since I cannot rely on the wheel mass as a major point of momentum, the fields using neos are very strong with very rapid accelleration but even then the sticky spot is so strong it is like a wall, even when I put a good distance between sets.

Last night I have been working in the open space between sets on various configurations, adding magnets is many ways to push the first magnets field of the second set away from the stator. I used a good sized piece of laminated transformer core with two round alnico magnets on the end and this worked the best and the stator was able to travel through the open spot but land too slowly in the second, so there is some possibility but I have to work more at it.

There are several threads on the subject of cancelling the sticky spot on the forum but we always run into the same problems. The field is all over. I have seen some Utubes on one guy that uses tin sheeting, etc., I purchased some flexible magnetic sheets and will try some, but I doubt it will work. I think the best way will be to use other other magnets to work against the sticky spot. Also, I have used some lamintated transformer core material that is giving not bad results. I guess it is simply sucking the field through the laminates, weakening it enough to be effected by my two alnico round magnets.

Today I will meet wit my metal shop friend and plan my aluminum wheel. Once I have the wheel I will be able to do the same neo mag tests as I did with this light pizza pan and compare the importance of having added momentum. This will be a good comparison, while I order my rotors.

When I get my rotors, all this sticky spot trials is supposed to be irrelevant, but still, nice to learn about. I am taking this one step at a time because I want to learn the maximum under varying conditions.

@cloud camper

You talked a few times about cancelling the B-field. But HOW? Do you know something we don't.

[wattsup]

Wow, I'll call him Bob Utah. He really made a nice build.

I don't know if sticking the rotors to the wheel with a glue gun can play against the effect or not, since the glue is pretty thick and may act as an isolator. Hmmmmmm.

Also, the rotors as shown are not identical to Mylows with the channel very small. This is why I have been "telling" abou tthe rotor and mainly also it lifting capacity to have some idea on Mylows. That information has not been given thus far and in my view is the only real reason I have been holding back on deciding which ones to order. I guess 1 to 2 lbs pull.

Sterling should have asked what the pull spec is on Bob's rotors.

Also, there is nothing that says the stator has to be in that particular position since if the rotor specs and field are not identical, maybe it is better for Bob to take the stator in hand and do some exploratory positions. But I am sure he did that already. I hope.

Well, one would expect that with such a fine build, that wheel should be turning, but something is not right. Yes the stator is wider then Mylows but again, there should be some better effect then what we have seen.

[Michelinho]

Hi wattsup,

I purchased some flexible magnetic sheets and will try some, but I doubt it will work.

When you get it, put your viewing film over it and you will see alternating strips of N-S-N-S etc... You use that film to mark and cut strips so you will get N on one side and S on the other side lengths. Using it as it come wont do.

Last night I have been working in the open space between sets on various configurations, adding magnets is many ways to push the first magnets field of the second set away from the stator. I used a good sized piece of laminated transformer core with two round Alnico magnets on the end and this worked the best and the stator was able to travel through the open spot but land too slowly in the second, so there is some possibility but I have to work more at it.

This is where the rubber magnet will come handy, you can glue a strip on the entry side with hot glue or other means and using the polarity needed to deflect or short out the unwanted sticky spot. I tried it last night on a round multi polarity used in floppy drives and it changed the whole aspect of the field. You can shape your fields easily that way.

If you would use the small "U" magnet on the periphery, I would then use very small neos inside or outside the "U" and see how the field change. The viewing film is not the holy grail but it does a fair approximation of the field size and strength. Too bad Gauss meters are so expensive.

Using Alnico or ceramic magnets to shape a field may be helped with cutting them at an angle or rounding off a side or sides like HJ did. You would need a water cooled ceramic tile cutter, if the magnet heats up too much you have to re magnetize them with a powerful magnetizer unit. Alnico 1, 2, 3 need 4,000 amp/turn/in  - Alnico 5, 6 need 6,000 amp/turn/in - Alnico 8, 9 need 10,000 amp/turn/in and ceramic 20,000 amp/turn/in. So definitely a professional unit*.

Take care,

Michel

Edit: A powerfull can crusher could also be used.

[Michelinho]

I should get about 27 lb of ceramic 8 magnets tonight and will do some more tests tomorrow or over the weekend.

I'll try to post some pictures of shaped fields.

Take care,

Michel

[jimcreeper]

@queue

Your replication looks great! Good work.

Tausenti