I'm in the need to create a "drivetrain" for a smooth and slow rotation and need only very low torque (for a Christmas pyramid). Such a Christmas pyramid usually is driven by candles and turns very slow (magnitude of ~10min-1), has very low friction (a metal tip rotates inside a tiny, concave glass plate similar to a contact lense) and continues to rotate a couple of times for itself. Using a gearbox is no option for me.
Using a stepper motor would allow the slow rotation, but I think it will not be smooth enough for the required low speeds. Would it be possible to use an old BLDC (hard disk) motor to run at so low speeds smoothly? Are there other options of low-torque slow motors?