A magnetic coupling is a non-contact mechanical device used to connect two shafts and achieve rotational transmission. It utilizes the interaction of magnetic fields to transmit torque and motion through magnetic force, without the need for traditional mechanical connections such as gears, couplings, etc. Magnetic couplings typically consist of an external rotor and an internal rotor, with the external rotor connected to one shaft and the internal rotor connected to another shaft. When the external rotor rotates, the internal rotor also follows the rotation, thereby achieving rotational transmission between shafts.