Engine Cooling Fans

[davidbrady]

That's neat William. From what I can tell, the advantages of this setup are packaging and granularity of control. I don't see any improvement as far as efficiency. it's hard to beat a belt driven system. In a brushless fan set up we have alternator losses, variable frequency drive losses and brushless motor losses. The typical 40HP engine load is probably still around that number. 30kW at 24V is 1250A, and at 48V is 625A, for a per fan supply of 80A. Fan power is directly proportional to pressure and flow, and input power varies with the cube of fan speed. Maybe because the fans are close to the radiator they can be spun slower, maybe because the radiator has greater effective fan area the motors can be spun slower, all this contributes to less input power and less amperage.