Permanent magnet levitation toys - drag
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BigBad
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Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
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Posts: 600
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AndrewM wrote ... BigBad wrote ...
It will be very low. There may be some hysteresis losses, but they're going to be very small provided you keep the magnets in the same quadrant.
Talk more about hysteresis? You're going to generate a BH loop in the material of the rotor as it spins. However, the magnets are saturated and very hard and so the area is likely to be small. So it's probably going to be very low loss. I expect aerolosses are going to be a much bigger issue unless you do something dumb.
You should be able to find a mathematical model for BH loop losses you can apply somewhere or other.
As I say, I'd be more worried about mechanical losses; if the magnet is mounted off centre or anything flexes at all as rotor spins that will lose energy, and if you hit resonance, enormous losses.
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