Quote:
kusojiji:
Gooserider, Yes, you are correct about plastic not being able to shield. I was surprised, however that the fan did cause my errors because of the large use of fans and the proximity of my fans to my hard drives in my other case (chieftec).
|
I agree with the concensus that it seems unlikely that the fan was the actual cause of your problem for the reasons stated. I don't have a clue about what else might have caused it though. However a fan SHOULDN'T be putting out that much of a field. A floppy is considerably less shielded than a hard drive, and it takes a pretty strong field to hose a floppy. Of course it may have been a case of having things in just the right (wrong) position to be a problem...
Quote:
|
I don't think that these fish waterpumps are shielded either, though. Some of the larger pumps have a metal can motor while most small ones, like the Eheim for instance, are totally encased in plastic with the electrical stuff encapsulated in some kind of epoxy.
|
There has to be some sort of metal can under the epoxy to make the windings work... Motor designers are usually pretty careful about designing things so that the fields are well contained, not only because of regulatory concerns, but also because stray magnetic fields don't do any useful work... The outer plastic shells are primarily cosmetic and protection against mechanical damage. However they also will act to space the motor guts away from any adjacent stuff.
Quote:
|
I don't know what shielding properties epoxy has.
|
No data, but unless it was metal filled, I would expect about the same properties as plastic. After all epoxy IS a form of plastic by some definitions!
Quote:
|
Would using a compass be a good test for checking the magnetic properties of a pump? I did that to an AC fan and found that it did not affect the compass at all while running.
|
Possibly. However keep in mind that a compass is just a magnet, and as such it will be impacted by any ferrous metals (steel, etc) along with magnetic fields.
I know that in the marine world, great care is needed when setting up a compass to ensure that it isn't adversely affected by nearby magnetic objects and electrical equipment. Usually special extra magnets and / or steel masses are used to cancel out such influences.
However I would not be worrying about it to much.
Quote:
|
I agree in that I haven't heard much about these types of problems. I'm posting this question on two other sites as well. The fan was really close to my drives when the errors were occuring. It wasn't only one error and it was happening intermittently.
|
Again, I don't know what caused your problem, but I really doubt it was the fan.
Gooserider