Reducing speed of AC axial cooling fan

techie_alison · 2006-04-13T15:19:38+00:00

Hello,Would it be an approach to insert a resister in series with one of thesupply leads? I've replaced two old fans where the bearings had gone and were rattling,the replacements are very clean running but so fast and even noisier.It's two of these fans btw,Thanks kindly,techie_a

Apr 13, 2006 21 Replies

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Sherif B.Muhamed 20 years ago

hi guys, i think ac motors, are controled using inverters and may be cycloconverters, some thing the change the 60 HZ of the supply to 40 or

30 HZ, will control the fan speed inverters are the right solution for speed control Sherif

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techie_alison 20 years ago

Hi John, hi Phil,

Final outcome, about 1470ohms for a fast and relatively queit throughput. Picked up some cheapies from Maplin yesterday, some 3W resistors to get the values right. They do get VERY hot, as to be expected but was never intending to use them, just getting the values roughly right. Space is at a minimum so on Tuesday I'll pickup a 1K and 470 in 50W from Rapid then wire both fans in parallel through the single pair of resistors. Really just going to go overkill so that I don't have to worry about what they're doing.

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