Pure maths, physics, logic (braingames.ru): non-trade-related brain games - page 96
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You also have to consider the low power consumption and the high efficiency. That's what makes it work.
It seems to be an asynchronous motor. No commutators, no manifolds, no hall sensor either. The electronics just switch the coils, the field rotates pulling the permanent magnet rotor with it.
current is supplied where the windings are, otherwise there is no point in them.
What to twist it all the same, you can't do without switching the magnetic field, which means it won't work with permanent magnets - it will just get stuck at the nearest dead point, regardless of efficiency, whether it's 99.9999 percent, if the input is 0, then the output is 0 as well.
If a 12 volt DC current were applied to the stator windings, with the rotor spinning, the fan would jam instantly, its blades would stop instantly. This effect is used to brake asynchronous motors.
You are so amazingly persistent... But there were three (3) sentences in my post and you seem to have only read two, read the third one:)
Alsu, do you know what reedlocks are? What do magnets have to do with it? It has nothing to do with them. Note that the fan leads are shorted and at the end you can't see them at all. The whole secret is not in the reed, of course, but in the transistor on the board. It's the one that generates the current by cooling. Here, I found a schematic. You put a magnet close to the reed switch and the fan turns on. Simple as that.