Recent content by KD5ZXG

https://www.mag-inc.com/Media/Magnetics/File-Library/Product%20Literature/Powder%20Core%20Literature/XFlux-Tech-Bulletin-2016-EN.pdf Ferrosilicon pressed into a block or other shape. I dunno why silicon content was limited to 6.5%? Perhaps distributed gaps made more irrelevant? Basically...

I grossly misunderstand how ferrite works, and could easily be in complete error: Trouble with saturating ferrite is that it may become either hard permanent or lossy supressor ferrite. Another reason to be cautious of it in a high torque motor. Only manganese oxide (in the presence of randomly...

I'm also thinking Iron phosphate powder is only about 1/3 iron by weight. And who knows what those chemical bonds might do to the magnetism. Most forms of rust are hard lossy magnets. Iron Phosphate, soft or hard? Consider you started with pure iron powder, what ain't broke don't fix... Now...

Perhaps, but also like high torque brushed AC motors, without brushes of course. Fields alternate several times faster than the rotor spins. I have to rebuild one of those soon anyway. Damn Craigslist table saw. Had no clue those were brushed till I plugged in and started throwing sparks.

https://en.wikipedia.org/wiki/Electrodynamic_suspension Yeah, rings embedded in an insulating rotor repelled from high frequency coils. Higher frequency than rotation for efficient repulsion, but with modulated intensity that rotates in much the normal slow way. Except pushing rather than...

What of repulsion instead of attraction? Drive high frequency AC to a sequence of coils to repel plates or rings in an otherwise insulating rotor. You've already some experience how much force eddies can create. Or perhaps a good old squirrel cage with variable frequency drive could somehow be...

I don't know why you would machine back iron at an inconvenient angle. Lines will automagically detour to adjacent iron that isn't yet saturated. A problem that fixes itself, and perhaps not even a problem. Who cares if not evenly spread when less than saturated?

http://www.ti.com/lit/ds/symlink/lmc555.pdf Specs improved over the original version. 3MHz, 50mA. I'm not reading in depth so maybe missing something...

Might make better balance to blend mismatched cells to matched sums for each parallel group? You say matched series strings, but I can't figure how that alone guarantees parallel balance. I have no prior pack building experience, could be misunderstanding how that works. Got a 36V mid motor...

Keep the plates and save your work. Just cut slots and shim with epoxy or other insulator. Not at the place where you have already tapped a set screw. Jigsaw an angle from one side (perhaps the clockwise side) of each stator to the outer edge. So you will still have one solid plate, but no...

Once was a thing called "repulsion motor" that ran as a squirrel cage induction motor. But had liftable brushes for extra low speed torque and starting. I don't understand how it worked. Was good enough for trains...

Don't make the guts too inacessible. Huge stationary shorted turns remain about each end of the stator coils. Those shorts will eventually need to be jigsawed open before it works at reasonable RPM. You could still step with it at very low rate to measure torque. Near DC, shorted turns of the...

Inductor with shorted turn is a transformer or autotransformer depending where the short is. Primary then only presents leakage inductance. Current circulating in the short cancels what would otherwise appear as magnetizing inductance. By adding a short, the full amount of inductance you depend...

Either type of magnet weighs more than iron. SmCo Gives a temperature advantage over NdFeB in return for brittleness and slightly weaker field. Yes, we can get rid of backing iron. Replace with cobalt, or add more heavy magnets to make an array that needs no backing, but not always helpful to...

Monkey see monkey do. Lams are always safe. Properly placed dead shorts can work significantly better. Not impressed. AC induction motors work entirely on eddies and nothing else. What would be the performance of this motor without them? What I speak of is a solution that uses both PM and...