https://www.penncontrols.co.uk/products/condenser-controls/condenser-fan-speed-controllers-for-ec-motors
Condenser fan speed controllers for EC motors
fan speed controllersec motorscondenser
https://www.bosch-mobility.com/en/solutions/electric-motors/ec-motors-for-electric-cooling-fans/
EC motors for electric cooling fans
The electronic motor commutation allows for continuous speed control.
ec motorscooling fanselectric