A cooling fan works by acquiring voltage supply, receiving PWM signal from controller, and providing
speed feedback back to control for monitor. Traditionally, this connection in a PC system is achieved by
using solid wires and connector to link cooling fan and main board controller. In slim form factor PC
system, the space is limited so only small connector and thinner wires could be used.
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INC, HP, "COOLING FAN WITH MULTI-PIEZO ELEMENTS FOR WIRELESS CONTROL", Technical Disclosure Commons, (November 20, 2018)