It's a shame when comments like these are downvoted. You're spot on, magnetic bearings certainly have a very small drag, but it's not zero. Going over that reed

It's a shame when comments like these are downvoted. You're spot on, magnetic bearings certainly have a very small drag, but it's not zero. Going over that reed switch will also produce a tiny amount of drag, it's miniscule by any measure, but it's still additional drag. Even just the fact that it's a spinning magnet passing by that conductive copper is going to induce a tiny drag force. What would be cool is a version of this but instead of permanent magnets in the rotor make it an induction motor or an electrostatic motor.