Isomatik·5년 전·discussLooks like the original version is driven by a coil electromagnet which deflects rare earth magnets in the brush head. https://www.powerelectronictips.com/teardown-whats-inside-a-...
Isomatik·5년 전·discussThis looks like the original paper: https://www.researchgate.net/publication/2737441_An_Evolved_...