A) Classical configuration where the two rotating magnets (shown in rotation in red, green and blue arrows) share the same rotation axis (gray arrows). A similar setup is used in modern milk frothers and food mixers, as well as magnetic stirrers in chemistry labs. B) One configuration studied in this research with the rotating magnets having their rotation axes (gray arrows) perpendicular to each other. Credit: Image courtesy of Okinawa Institute of Science and Technology Graduate University – OIST
The new milk frother you are using to prepare your cappuccino is likely using magnetic gears. Magnetic gears transmit rotary motion like mechanical gears but instead of teeth they use magnetic attraction and repulsion between rotating magnets...
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