My bad for getting the terminology wrong. Rheostat, pot, variable resistor, I kind of think of these as the same. Yes this is indeed a 3 wire potentiometer. From the circuit board label it is +5v, Signal (connected to the wiper), and ground. The connectors shown in the image are, left to right. Speed control, 12v - 5A DC, and the brushless fan motor. On the back board the labels for the speed control areFor starters now, we have no information about what the actual voltages at the speed setting potentiometer are. AND, it is not a rheostat, they only have two connections. It is indeed a potentiometer.
The fan is clearly not a simple small fan, it is driven by a variable speed brushless motor.
OK, so my guess was off a bit. 35K RPM is screaming. That could be a supercharger for a small engine. The ones on dragsters take about 20HP at speed.
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