I've read that DC fans require a transformer. Does this model separate the DC motor or is it contained in the fan motor housing?

For the Fanimation Studio Collection Kwint 52‑in Brushed Nickel with Gray Blades Color‑Changing LED Ceiling Fan, the fan uses a DC motor, and any transformer/driver that’s required to run the motor and integrated LED is contained inside the fan housing rather than being a separate external box you have to mount elsewhere. DC motors in modern ceiling fans like this one run off standard 120 V AC from your ceiling, with the internal electronics converting that to the DC power the motor needs. If you’re installing it or planning controls, just wire it per the included instructions — there’s no separate transformer to install in the ceiling.