03-31-2024, 04:05 AM (This post was last modified: 03-31-2024, 09:02 AM by unimmortal.)
Magnet motors have a bit of a buzz at the moment so I thought I'd give one a shot.
This thread is inspired by Jim's 'neutralizing the gate' thread, after recent developments revealed by Tinman over at OUR.
I'll be using my existing 20x20, 10x5, 20x20mm stacks of N40 neo's, and a 110mm x 45mm rotor. Centre to centre of opposing rotor magnets is 42mm, so a gap of around 22mm.
Tying the rotors together will probably be a couple of pulleys running a figure 8 belt at this stage... pretty fitting Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
03-31-2024, 07:37 AM (This post was last modified: 03-31-2024, 10:08 AM by unimmortal.)
Well, this is interesting. With both rotors mirrored and working in repulsive mode, not joined. Rotating so two magnets are at minimum distance, what do you think happens when you break the spell with a nudge either way?
The rotors always want to turn in the same direction together! Further, when spinning both rotors in the same direction, they can spin and slow down in unison!
Opposite spinning rotors will generally see one leverage the other and spin a little faster.
By repelling in different rotational directions, an equal and opposite reaction occurs driving both rotors (in this case) clockwise.
It'll be interesting to flip a rotor and see the behaviours that come out in attractive mode.
04-07-2024, 02:35 AM (This post was last modified: 04-07-2024, 09:50 AM by unimmortal.)
A quick video showing the effects of rocking a bar magnet N to S under ferrofluid.
Notice the gear / machine like qualities as the fluid moves to each pole to reveal the direction of flows.
4 sides shown, the last side has a peculiar effect for a uniform field Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
It looks like I'm going down the single shaft split rotor path. After a bit of playing around with two side by side and spinning the same direction, I just couldn't reconcile the losses between two rotors.
Pictured is the test bed (in front), with 3 magnets in each - south (inflow) pointing in, and north (outflow) pointing out. In the background is the Axial chassis the rotors will go into, and to the right is a barebones version with 20mm mags and cores that spins effortlessly.
Now for the tricky bit. Magnets are much more dynamic than N and S, as I've recently come to understand. A solid afternoon of looking at ferrofluid over magnets through a magnifier has all but confirmed we are looking at two fields that interact dynamically to obtain an equilibrium, and also abstracts to show the familiar N and S poles. Kinda like a duck smoothly moving across the water, what we don't see is the engine that paddles underneath. That engine you can manipulate.
After a few late nights I've just finished the stator. A bit tricky without a 3d printer, although a challenge I enjoy.
It works by attracting - repelling at the point where the outer magnets are being alternatively attracted to coil cores at either end.
The magnets halves are wrapped in tape for friction and then attached to two washers, with small pegs glued to the middle disc for locating and rotating.
After an evening of testing and tuning, this is devilishly close to running.
Aside from some DIY tolerances that need re-working, I'm going to try sliding the halves to give the magnet a slightly longer duration. There also needs to be a slight angle to allow better transition between pull and push - I'm still hitting the wall.
I also need to work out how to fix the stator in place. Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
