A simpleminded MOSFET circuit provides PWM drive for the BLDC blower:
The Tek P6302 current probe looms much larger in real life than in the schematic:
A quick dataset shows the RPM variation against PWM duty cycle:
Unsurprisingly, the RPM curve resembles the earlier results against a variable DC supply voltage:
Capturing the current waveform is stalled behind another project, but it has exactly the voltage spikes you’d expect from forcibly switching an inductive load.