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   Birdulon (birdulon@shpposter.club)'s status on Thursday, 14-Mar-2024 18:35:32 JST Birdulon

   in reply to
   @Suiseiseki >I believe the wiring is directly connected to an electric motor as PWM on/off pulses are very good at controlling of the speed of a motor.
   The cheap setup is to just hook the PWM to a transistor gate yeah. It gives good-enough control from cold start to like 50-100% and can drop from there to like 30% or whatever somewhat reliably. Some more complex things that I'd expect premium fans to go for aren't practical with discrete logic, e.g. skipping over unpleasant fan frequencies (common feature on industrial fan drives where the consequences may be large masses rattling rather than user annoyance). They're easy enough to implement on the external controller side of course, but I wouldn't be surprised if some of these vendors take matters into their own hands.
   
   Couldn't find any internal shots of this fan, but some of the features they advertise make me suspect they just dropped a microcontroller in, namely:
   >In the event that the PWM signal is 0%, the SilentWings PWM will continue rotating at the minimum RPM.
   >The Auto-Restart-Function makes it possible for the fan to restart itself automatically when interrupted
   >When controlled via conventional systems, the low initial voltage ensures a rapid start-up phase for the fan
   They *could* be approximated with discrete logic but that could be more expensive than just slapping a cheap MCU in, which would also be faster and easier to iterate on in-house.