@edumation Ok, thank you very much. What about the pole pieces? Is this normal steel or is it made of lots of steel sheets like in a electrical transformer ?
At magnomatics video it looks like steel bolts in a non-magnetic frame.
@edumation the grey parts of the diagram is iron. iron aligns to an imposed magnetic field, it is said to 'conduct' a magnetic field. but because there is gaps in the iron it will only respond to the magnetic field close to it. so it 'samples' the outer magnetic landscape. the result is fewer poles seen by the inner magnetic array. if you label each grey piece red or blue by what color it is over you will see fewer poles than the out ring. that's how I think it works
@DanFrederiksen I like your explanation. 1. Could you explain the case without iron pieces? 2. Could you explain why the number of pieces must be the sum of number of pole pairs of outer and inner rotors?
2) I don't understand the specific formula but it makes sense that the spacing of the iron has to fit the outer number of poles in such a way that the resulting moire pattern has a pole number that fits the number of inner poles.
@DanFrederiksen 1. Without iron pieces, it would work as a coupling 2. The proper number of iron pieces can be derived from the flux density space harmonics. Go to IEEE Xplore and search for ''Magnetic Gear'' and you will find the theory. I just wanted a non-mathematical explanation. Thank you.
@edumation for same pole numbers it can work as a coupling yes but not gearing.
it is also possible to do gearing without iron but it seems only with point contact like mechanical mesh gears and that would dramatically reduce the torque strength
@edumation do you also know the ratio from inner rotor to the pole pieces when the outer rotor ist static, is there a formula like Gr=PL/PH ?
Thx :-)
Fol84 23 hours ago
@Fol84 If pole pieces speed is Ws and Torque Ts and that of inner rotor is Wh and Th then Gr=Ts/Th=Wh/Ws=Ns/Ph.
edumation 17 hours ago
@edumation This means for your video-example a ratio from inner rotor to pole pieces of => Ns/Ph => 14/4 = 3.5 ?!
Thanks a lot and best regards :-)
Fol84 11 hours ago
@Fol84 That's correct! I will upload another video of a gearbox that uses Ps/Ph
edumation 10 hours ago
@edumation Ok, thank you very much. What about the pole pieces? Is this normal steel or is it made of lots of steel sheets like in a electrical transformer ?
At magnomatics video it looks like steel bolts in a non-magnetic frame.
Fol84 6 hours ago
@Fol84 Like transformer steel
edumation 6 hours ago
@Fol84 Like transformer steel
edumation 6 hours ago
it's a funny moire pattern effect because the iron pieces only conduct samples of the outer magnetic landscape. clever.
DanFrederiksen 7 months ago
@DanFrederiksen What do you mean ''iron pieces only conduct samples of the outer magnetic landscape''?
edumation 7 months ago
@edumation the grey parts of the diagram is iron. iron aligns to an imposed magnetic field, it is said to 'conduct' a magnetic field. but because there is gaps in the iron it will only respond to the magnetic field close to it. so it 'samples' the outer magnetic landscape. the result is fewer poles seen by the inner magnetic array. if you label each grey piece red or blue by what color it is over you will see fewer poles than the out ring. that's how I think it works
DanFrederiksen 7 months ago
@DanFrederiksen I like your explanation. 1. Could you explain the case without iron pieces? 2. Could you explain why the number of pieces must be the sum of number of pole pairs of outer and inner rotors?
edumation 7 months ago
@edumation 1) it wouldn't work without the iron.
2) I don't understand the specific formula but it makes sense that the spacing of the iron has to fit the outer number of poles in such a way that the resulting moire pattern has a pole number that fits the number of inner poles.
DanFrederiksen 7 months ago
@DanFrederiksen 1. Without iron pieces, it would work as a coupling 2. The proper number of iron pieces can be derived from the flux density space harmonics. Go to IEEE Xplore and search for ''Magnetic Gear'' and you will find the theory. I just wanted a non-mathematical explanation. Thank you.
edumation 7 months ago
@edumation for same pole numbers it can work as a coupling yes but not gearing.
it is also possible to do gearing without iron but it seems only with point contact like mechanical mesh gears and that would dramatically reduce the torque strength
DanFrederiksen 7 months ago
@DanFrederiksen Magnetic gearing without iron pieces? How?
edumation 7 months ago
@edumation just like mesh gears. just with magnetic poles instead of teeth. draw it on paper, you'll see
DanFrederiksen 7 months ago
Very good work! Nice prototype! I like very much your calculation formulas! See you
pirondinimarco 1 year ago
its really nice idea to get out of the nois and maintenance
almosawi74 1 year ago