rhitee05 wrote:When discussing airgap, <snip>...
... Placing wedges of magnetic material in the gaps between magnets will help with this.
Kingfish wrote:Admittedly it hasnÃ¢â‚¬â„¢t caused me to lose sleep, nonetheless I am a bit concerned about accuracy. Pesky thing that Ã¢â‚¬â€œ accuracy.
Kingfish wrote:This now brings up a question of construction, and methinks the most economical would be to have wedges that fit between the bar magnets rather than a challenging water-jet-cut cage. IÃ¢â‚¬â„¢m just thinking out loud; the wedges would be very cheap to fabricate, less waste of material, and better than a poke in the eye Ã¢â‚¬â€œ as in doing nothing. See Figure 1.
Kingfish wrote:The second idea to explore is using a horseshoe shape for routing the flux as displayed on the right of Figure 2.
Probably the most useful value for you would be the value of Bz centered between a pair of poles. In that case, z=t/2, so the two cosh terms will cancel and the sine will be 1 at x=0, so Bz=Bm0.
A little flux bridge like you've drawn, if it had any effect, would likely serve to divert some of the useful flux around the stator. You're thinking in the right direction, though.
Kingfish wrote:Flux Ring:
I presume you mean this sort of arrangement in Figure 3, yes?
Kingfish wrote:Ha! Now IÃ¢â‚¬â„¢ve got the Ã¢â‚¬Å“happy puppyÃ¢â‚¬Â syndrome Ã¢â‚¬â€œ with my tail all wagging. Early on I had considered adding a Radial Flux component to the design but discarded it because of the issue of trying to reduce the airgap between the winding and the magnetic face. In reference with Figure 5, is that what you meant?
Er, you were on the right track but you must've taken a hard right turn while I wasn't looking.
Kingfish wrote:Was it perhaps the laminate shoes as indicated in Figure 6 as another type of Flux Ring? Hmmm, I prefer to keep it simple.
Kingfish wrote:Air Gaps & Adjacent Magnet Spacing:
It seems to me that the Air gap between Magnets (Agw) and the surface of the Copper Windings should be closest. Are you suggesting that the distance between magnetic faces (z) should also be less than the air gap between adjacent magnets (Agm) as well so as to promote the inductance across z (Agz)?
With all these air gaps, I figure we better have some shorthand
Kingfish wrote:Understood. Neat FEA pics; did you make those?
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