It is a question I asked to myself.
I studied the induction motor at school, and I asked to the teacher if it's possible to use magnets for build a reductor with magnets. She said it's possible but the energy lost in heating will be very high. I would like to know if my forces are correct and how to estimate the losses.
The Rotor1 rotates at 3w clockwise from an external device not drawn. The Rotor2 is push by the Rotor1. I guess the radius of the Rotor1 is 1 and the radius of the Rotor2 is 3. I would like to have w for the Rotor2, but I'm not sure if it is possible.
I have some questions:
1) I think it's possible to use it only if I start the device like I drawn, correct ? The magnet is pushing clockwise the Rotor2: the Rotor2 is acccelarating, the Rotor2 gives an energy to an external device (not drawn), magnets push counterclockwise the Rotor2: it is decelerating. The angular velocity of the Rotor2 is not constant but the mean can be at w, no ?
2) Losses are very high, even w is low ? How to estimate them ? In theory is it possible to have an efficiency of 1 with this reductor ?
3) Maybe this device exist, have you a link ?
The Attempt at a Solution
I drawn forces:
My forces are correct ? The Rotor1 gives an energy F*r*3w*t and the Rotor2 can give F*3r*w*t, the efficiency can be at 1 only if magnets don't lost heating.
For me the angular velocity is not constant but like:
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