- May 10, 2009
Drive type has nothing to do with bearing type. We're talking bearings here.
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The ones I took out of a really old HP workstation were pretty plain square wave drive fans with what appears to be a FDB. I'm not sure about the newer ones, but sine wave drive has pretty much became standard on any good quality fan.Any info on panaflo 120x38 fans regarding bearings and motor drive?
I hear there are two revisions, but I'm guessing the good ones that had medium to high speeds and hydro wave bearings might serve xsuperbgx well...
Variable speed can throttle way down, to the extent that a high end Delta becomes basically inaudible. An exception would be the old Nidecs with the 5 step drive, which buzz pretty bad at low speed. (The newer ones are sensorless FOC just like the Deltas and perform about the same.)
As for performance at low speed, theoretically a resolver based drive would do better, but in practice, the sensorless drives do as well or better. Computing power has become so cheap that they could just throw in 40MHz or so of DSP in there to do some sophisticated signal processing.
Yeah know, with some shim stock and creative shim punch work and screws you could get nine of these and make a silly $300+ 120 fan replacement.
No one in their right mind would ever do it, but would be funny to see much air it would move and how the noise compared, I'd imagine a bit once they were multiplied.
Sorry just being odd atm.
Could probably put about 75 or so of em in just a 1200, would sound like a mad beehive.