My computer power supply fan is terribly noisy when I first turn it
on. After a few minutes it quiets down and is fine till the next time
I turn on the computer. Then I go in my barn and turn on an electric
heater and the fan in there is just as noisy, but it too quiets down
once the thing is running for a few minutes. Why do these small fan
motors do that? If a bearing was bad, I dont think they would quiet
down. I just learn to live with the noise as long as the motors run.
I concur, never attempt to lubricate one of those small computer fans,
ESPECIALLY ONE INSIDE YOUR POWER SUPPLY! This could be an indicator that
the fan in the power supply is about to give it up. If that is the case
replace the power supply before the fan does die and the power supply tanks
and takes other more important and heat sensitive components with it.
But....... if the machine has always done this since new, and it is a fairly
new machine, it is quite possible that you have a thermostatically
controlled cooling fan in there and on boot up it does a self-test and fires
up at full speed. YMMV.
I imagine any lubricate that may cause further damage to the
motherboard will void a warranty.
I replace the dang power supply. Noise is telling me the computer
needs attention - same with any other fan in the box.
"Well, it doesn't happen all the time, but when it happens, it happens
It is bullshit. If you put axle grease on it then it will never turn again. By
the time a fan is howling, it has so much slop in the bearings that it is beyond
repair. You can't fix such a fan with any lubricant. Christ. Spend the
fucking two bucks and replace it! If your time is worth more than ten cents an
hour then it is a bargain.
Sure you can and it is easy and fast. Takes 5 minutes at most and
you don't have to search for a replacement part. I've got 5
computers that have been running over a year with my 'lube job'
repairs on the fans and you can't hear a one of them. Best of all
lubricants is the lubriplate wheel bearing grease. 2nd best is CV
joint grease which looks exactly like the lubriplate.
Small motors typically have bushings instead of bearings. Bushings wear out
sooner. The axle is jigging around inside the bushing until the structure
warms up a bit -- could be the axle swelling from heat, or dirty lubricant
softening up, or something else a more knowledgeable person will point out
I fix a lot of these for clients. Clean the gray gunk off the fan blades
with a can of compressed air. That usually solves the problem. If not,
replace the fan. They're less than 10 bucks, unless you go for the gaudy
ones with LEDs. Clean out all the rest of the dust in
If you want, you can try some light oil, but don't use much. You definitely
don't want oil inside your PC. In fact, don't use oil unless the fan blows
OUT of the case. I've always just replaced the fan, because I'd have to
charge more for half-measures.
I won't presume to advise you about your heater. Your barn might burn down,
and then I'd be sad.
I hate to tell you this, but because you did NOT advise me about the
barn heater fan, the heater burst into flames and burned the whole
barn down, killing all the animals and several workers. It was
horrible. It's your fault for not giving me help. You will be
hearing from my lawyer, who is also my wife, and she sleeps with the
judge a few times every week, so you dont have a chance to win the
Well, OK, I'm just giving you some shit and the latest Jerry Springer
Seriously, I just oiled that fan motor in the heater. It dont seem
like it's worn too badly, but the oil quieted it down. There was a
little fire though, (almost). I dripped some oil on the heater coil
and that sure smoked for a few seconds. It works quiet now.
This heater is strange in design. The motor looks like one of those
old record player motors but the coil windings are thick. Probably a
#12 enamelled wire. The heater coils are connected in series with
that motor. Thats an odd design. I cant understand the point to
that, other than if the motor burns out the coils will not heat.
Otherwise it makes little sense and that is why that wire is so thick.
Thats a lot of amperage to go thru that small motor.
The computer is next. If I dont post a reply in a few days, call Bill
Gates and tell him I blew up my computer. I'm sure he will care. I
just hope the power supply is not riveted. It already looks like it
will be a bitch to remove in this small case.
Another comment. Why the hell do they sell household oil with perfume
in it? I hate that smell, and the odor will probably be on my hands
for days now. Do they do this for women? They surely dont impress
men with that stink !!!!!
(Disclaimer: I just dated myself when I said "record player". If you
do not know what a record player is, please contact your grandparents
or someone elses grandparents for a worthwhile education in musical
history and entertainment.). Or else go to:
And just for the record (no pun intended), you could not download
records on the internet. You had to go to a record store. Yeah, they
really had places like that back in the stone age of the 1900's
Oh, forget it, if you're that young, you dont know shit from shinola
anyhow. Now, tell me what shinola is!!!!!
Hint: It's NOT an Ipod (whatever that is).....
Might be because a smaller number of turns of heavier wire is a bit less
costly to manufacture? And, a motor wound with heavier wire has a
slightly lower chance of the wire breaking from vibration at a termination.
Ampere-turns is what sets what the motor does, and you can get the same
amount of them with lots of turns and lower current or fewer turns and
I confess I've never run into a small heater wired like that, but now
that I think about it the setup sounds like it would provide a bit of
positive feedback of the element temperature, which sounds sort of bass
ackwards to me.
i.e. when the element is cold, the curent through the motor is greatest,
causing the motor to run a bit on the fast side, cooling the element
more, and conversely when the element was hot and the current draw was
less, the motor might run a bit slower, leading to less cooling and an
even higher element temperature.
Hopefully someone smarter than me will give us a good reason for that
setup, beyond the possibly lower manufacturing cost.
Agreed, but what does that info add to this thread Dave?
Isn't it rather unlikely that the OP will be running that heater on
anything other than 60 (or maybe 50 ) Hz power?
If "Gerry Atrick" is also the OP, then by describing the motor as a
"phonograph motor" style, he's probably talking about a shaded pole
induction motor, which was the most common motor type used in record
players once they gave up on the crank wound spring motors.
There were a few high end record "turntables" which contained
hysteriesis synchronous motors, which would have been the type you
brought up, but it's highly unlikely anyone would waste the money on
that type of motor to drive a fan, 'eh?
Yes, same person. I was using a different computer and different
Yes, its a shaded pole. I could not think of that phrase when I
posted. But MUCH heavier duty than a turntable with that heavy
Agreed, just a plain old shaded pole, coil of wire on a laminated core
with bearings on each end.
but the op stated the fan was IN his power supply. If that is the case, and
if the fan is indeed failing and not a temp controlled unit, I'd recommend
changing out the whole power supply rather then opening it up.
Having worked as an electrician for years, I am not afraid to open the
power supply and can safely do it. This "baby case" is so packed that
I would likely not find a power supply to fit the darn thing. I hope
to get a tower soon and transfer everything to it. At that time I
will likely have a new power supply so for now some oil will hopefully
keep it running. But, it IS the power supply fanm NOT the CPU cooler.
Thats why I was confused when someone said LED lights on the fan. But
I found out they put them on some CPU fans, which seems real stupid to
me because once the case is shut, who cares..... Just a waste of
electricity, even if it is very minimal.
I guess I consider my computer a hobby, perhaps an obsession, but the
insides of mine are clearly visible through the clear side panel on
the left side. I can barely hear mine, but I have a premium power
supply with a variable speed ball bearing 120mm fan, 4- 80 mm ball-
bearing case fans, & a 120mm ball-bearing side door fan, + 1 80mm ball-
bearing cpu cooler fan. It runs consistently at 33-40 c cpu
temperature with a relatively hot chip (AMD FX55) even during hard
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