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|kbn| · 05-13-2004, 09:11 PM

kronchev meant 8-10w not amps I think?

Cathar you tested a d4 at lots of differnent speeds iirc? was it the bearings/motor that made the pump niosy at 20v+?

12v pumps arnt ideal, they are better than mains pumps though, becuase the higher current used (and lower voltage) gives more torque to the motor, giving better head, i think?
A pump using about 15v three phase AC at about 360hz, and with more poles (AC motor speed is freq divided by no. of poles iirc, voltage wont affect it) would probably be the best, but youd also need a dc-3phase converter built in - running it form the 12v of a psu is very usefull though..
^ this would give a much smoother turning of the motor resulting in less niose from bearings, which also should last longer.. while still keeping high current for more torque. doubt any company will make them though... (not at and affordable price anyway)

05-13-2004, 09:11 PM	#13
\|kbn\| Cooling Savant Join Date: Feb 2004 Location: W. Sussex, UK Posts: 329	kronchev meant 8-10w not amps I think? Cathar you tested a d4 at lots of differnent speeds iirc? was it the bearings/motor that made the pump niosy at 20v+? 12v pumps arnt ideal, they are better than mains pumps though, becuase the higher current used (and lower voltage) gives more torque to the motor, giving better head, i think? A pump using about 15v three phase AC at about 360hz, and with more poles (AC motor speed is freq divided by no. of poles iirc, voltage wont affect it) would probably be the best, but youd also need a dc-3phase converter built in - running it form the 12v of a psu is very usefull though.. ^ this would give a much smoother turning of the motor resulting in less niose from bearings, which also should last longer.. while still keeping high current for more torque. doubt any company will make them though... (not at and affordable price anyway)