reducing fan speed help.

[ivtec]

Hi guys; hope you have a Happy New year;

i have here a dehumidifier air purifier that i found almost new that i would like to use in the bad room.but there is a drawback it makes too much noise even on low speed for me that i can't go sleep,it has a switch with speed 1 and 2 and off,
is there a way i can reduce by half the lower speed,i was thinking of putting a resistor but i don't know how much ohms i should use,
i have here an example see link;but this is for 12v fan,i need for 120v fan.
any suggestion would be appreciated,thanks.


http://www.pcbheaven.com/circuitpage..._DC_Fan_Speed/

[momaka]

Re: reducing fan speed help.

Post a picture of the fan motor.

I'm thinking it's most likely a shaded-pole AC induction motor, in which case a resistor definitely won't work.

[ivtec]

Re: reducing fan speed help.

Post a picture of the fan motor.

I'm thinking it's most likely a shaded-pole AC induction motor, in which case a resistor definitely won't work.

Thanks,i found this thing out in the street, and to trash it will go,no way i can sleep with this thing on, even in lower speed,and you're right the resistor is no not a good solution.thanks anyway

[ivtec]

Re: reducing fan speed help.

Thanks,i found this thing out in the street, and to trash it will go,no way i can sleep with this thing on, even in lower speed,and you're right the resistor is no not a good solution.thanks anyway

this is the one in this link.




http://www.honeywellstore.com/store/...fier-black.htm

[keeney123]

Re: reducing fan speed help.

You might write Honeywell technical support and ask them if there is any way you can reduce the sound of the motor.

[SteveNielsen]

Re: reducing fan speed help.

Use a lamp dimmer.

[stj]

Re: reducing fan speed help.

the fan exists for a reason.
try mounting it on rubber spacers.

[SteveNielsen]

Re: reducing fan speed help.

The fan exists to move air to evaporate the water into the air. The more air that moves the more noise it makes. It has two speeds stock, slowing the fan further will make it somewhat quieter and isn't going to harm anything.

BTW, Ivtec, it is not a dehumidifier, it is a humidifier. It puts moisture into the air.

[keeney123]

Re: reducing fan speed help.

One other question is it the noise of the blades moving through the air that is the problem or the hum of the motor itself?

[SteveNielsen]

Re: reducing fan speed help.

Or it could be a body part of a dead lizard stuck to a fan blade. I actually saw that happen to an air conditioner fan once in Louisiana. Damn near rattle the whole unit off the wall. True story.

Back to topic for a moment, he wants to know how to slow down the fan so it's quieter, ok? It's not a major physics problem.

[keeney123]

Re: reducing fan speed help.

Or it could be a body part of a dead lizard stuck to a fan blade. I actually saw that happen to an air conditioner fan once in Louisiana. Damn near rattle the whole unit off the wall. True story.

Back to topic for a moment, he wants to know how to slow down the fan so it's quieter, ok? It's not a major physics problem.

It is not that it is a major physics problem, it is that he put down dehumidifier for a humidifier that causes me to wonder what the actual problem is. Seems to me the problem is noise. Noise can be cause by different things. Would it not be better to find out where the noise is coming from first? Perhaps the whole problem can be corrected by setting it on some Styrofoam a inch and 1/2 thick and one would not even need to control the fan speed?

[stj]

Re: reducing fan speed help.

it could be as simple as loose screws or cracked plastic posts letting the motor jump around in the casing.

we need to see in it.