'Core Rearrangement' - 'Fin Motor' - Open Tech - OU?

[tim123]

Hi Khwartz, it's going slowly, as usual... Thanks for asking.

I've attached before & after pictures of what I've been working on below. My workshop... I'm just waiting for the new doors to arrive.

I've wanted a proper workshop for years. You need the space, and the tools, to do decent development work, and the living room's just not good enough any more.

The fin-motor is my top priority, although I may get distracted by Tinman's 'Rotary Transformer' a bit...

[Khwartz]

Wow! What difference! for sure you have spent time on it!

Indeed, a true good workshop is a must for good easy experimentations

I look forward for your progresses, "lentement mais sûrement" ("slowly but surely") we say in french

Cheer, Khwartz.

[tim123]

Fin-Motor: Test of Principle...

I've done a few tests to see if the fin motor design above will work.

The pics below show the apparatus. Hopefully all will be clear.

Pic 1) Shows the coil I used, and the power supply. The coil is a spool of wire - as bought from the shop - with part of the spool cut away.

Fin-Motor Arrangement:

Pic 2) Shows the apparatus used to test the fin-motor design as shown above...

- Made from meccanno parts. Cut with an angle grinder.
- The central semi-circle is mounted on a bearing, so it can rotate freely
- The 3 parts were placed close together for the test - moved apart to show the bearing, for the pic.
- The shaft was held inside the coil by hand, and moved around to see any variation in the effect throughout the core.

Results: Fin Arrangement

The effect expected was that the central semicircle 'fin' should line-up with the 2 fixed outer fins, when the power was applied.

The arrangement was held so the stator fins were vertical, and the rotor fell to horizontal under gravity. So they overlapped as shown the previous post.

When the power was applied, the effect was not observed. There was some attraction between the fins, but there was no rotary movement at any position within the coil. When I rotated the shaft, and the stator fins would 'carry' the rotor fin away from horizontal, but the force was weak, and it would fall back.


Parallel Plates Arrangement:

Pic 3) Shows a pair of meccanno plates, joined at one end, used to test the strength of the repulsion force when inserted lengthways into the coil.

As expected the 2 plates repel each other, and the force is quite strong. However, I can't really see an easy or practical way to make use of the force in this arrangement...


Rotating Cores

Pic 4) Shows a pair of rotating 'cores' on a plate, that can be inserted into the coil core.

When the power is applied they line up along the axis of the coil. The effect also works with a single 'core'.

The force in this arrangement is the highest. The mini cores are very strongly attracted to the axis, and to each other.

It looks like a practical arrangement that could be quite easy to build. It still conforms to the basic principle of 'core-rearrangement'.

I'll do some more work based on these new findings later on.


Tim

[tim123]

Another test. Pic attached.

In this arrangement, I used 2 sets of small magnets as springs to hold the core off-axis.

Power on - core aligns with coil axis
Power off - core aligns with PMs

It works very well, and I think I can use this mechanism to get continuous rotation - even if the coil is part of a tuned circuit.

I would have liked to put enough PMs on it to get the core to go across the coil axis completely, but there's not room inside the coil.

[tim123]

Hi Webby,
  thanks for the input. 

I don't really have any alternatives ATM... I was a bit suspicious of the holey plates but - if I turn the shaft round and put it against the opening of the coil - so the 3 fins are half-in the coil, and pointing down the coil - the central fin is firmly repelled, and comes out of the stators.

So the fins do behave like ok magnets when they can.

It really does look like there's very little attraction between the fins in that arrangement.

I still have an arrangement that works well, it's just not the original one. I'll have to give it some more thought, and see where it takes me next...