low-emf fan

> **
>
>
> I don't remember where I got it, but have one with a DC motor that uses
> batteries or an AC adapter. Been using the adapter because I don't think
> the batteries would last long; probably should go with rechargable ones?
> Anyway, it didn't help me all that much. Was better than a standard fan,
> but the motor still seemed to affect me somewhat. Don't think it was the
> adapter. Also have a small standard window air conditioner that I use
> minimally, mainly in the afternoon.
>
> John L.
>
>
> --- In [hidden email], "russel395" <russturk@...> wrote:
> >
> > Hi all. Does anyone have a recommendation for a low-emf room fan to keep
> cool for the summer? Is there any such thing? Would a battery powered one
> be better? What do you all use for fans?
> >
> > Thanks!
> >
>
>  
>

>What you want is an AC motor with symmetrical coil windings.
>It will still have a strong magnetic field at close range but will drop off
>very fast at longer distance.  DC fans radiate RF.  I want to Bed Bath and
>Beyond and the smaller fans were all the "open frame" or C-frame motors,
>and the fields of those drop off slowly because they are not symmetric.
>One of them  (second smallest?) I couldn't see the motor until I got it
>home and looked carefully but it was also asymmetric.  But the meduim sized
>Vornado fan (I think it was over $60) does have a nice motor (3 speeds,
>using different windings).  Don't get one with continuously variable
>speeds.  I also have a Honeywell heater that has a decent fan motor.
>Motors with permanent magnets and built in controllers should be
>avoided...they are essentially a DC motor with a switch mode power supply.
>These are becoming common in refridgerators unfortunately.
>
>On Wed, May 22, 2013 at 9:20 AM, john <[hidden email]> wrote:
>
>> **
>>
>>
>> I don't remember where I got it, but have one with a DC motor that uses
>> batteries or an AC adapter. Been using the adapter because I don't think
>> the batteries would last long; probably should go with rechargable ones?
>> Anyway, it didn't help me all that much. Was better than a standard fan,
>> but the motor still seemed to affect me somewhat. Don't think it was the
>> adapter. Also have a small standard window air conditioner that I use
>> minimally, mainly in the afternoon.
>>
>> John L.
>>
>>
>> --- In [hidden email], "russel395" <russturk@...> wrote:
>> >
>> > Hi all. Does anyone have a recommendation for a low-emf room fan to keep
>> cool for the summer? Is there any such thing? Would a battery powered one
>> be better? What do you all use for fans?
>> >
>> > Thanks!
>> >
>>
>>  
>>
>
>
>[Non-text portions of this message have been removed]
>
>
>
>------------------------------------
>
>Yahoo! Groups Links
>
>
>

>
>
> Thanks for pointing out the refrigerator. I find that it is a huge polluter of dirty electricity. Even though it is on the other side of the house, I cannot leave it on when I sleep otherwise my hands go numb, wake up dizzy, and I don't rest well. I guess my next step is to look for.an older fridge? Or is there something else I can do? Example rf filter, install a large transformer on the line?
>
> ------------------------------
> On Wed, May 22, 2013 9:32 AM PDT Bill Bruno wrote:
>
>> What you want is an AC motor with symmetrical coil windings.
>> It will still have a strong magnetic field at close range but will drop off
>> very fast at longer distance.  DC fans radiate RF.  I want to Bed Bath and
>> Beyond and the smaller fans were all the "open frame" or C-frame motors,
>> and the fields of those drop off slowly because they are not symmetric.
>> One of them  (second smallest?) I couldn't see the motor until I got it
>> home and looked carefully but it was also asymmetric.  But the meduim sized
>> Vornado fan (I think it was over $60) does have a nice motor (3 speeds,
>> using different windings).  Don't get one with continuously variable
>> speeds.  I also have a Honeywell heater that has a decent fan motor.
>> Motors with permanent magnets and built in controllers should be
>> avoided...they are essentially a DC motor with a switch mode power supply.
>> These are becoming common in refridgerators unfortunately.
>>
>> On Wed, May 22, 2013 at 9:20 AM, john <[hidden email]> wrote:
>>
>>> **
>>>
>>>
>>> I don't remember where I got it, but have one with a DC motor that uses
>>> batteries or an AC adapter. Been using the adapter because I don't think
>>> the batteries would last long; probably should go with rechargable ones?
>>> Anyway, it didn't help me all that much. Was better than a standard fan,
>>> but the motor still seemed to affect me somewhat. Don't think it was the
>>> adapter. Also have a small standard window air conditioner that I use
>>> minimally, mainly in the afternoon.
>>>
>>> John L.
>>>
>>>
>>> --- In [hidden email], "russel395" <russturk@...> wrote:
>>>>
>>>> Hi all. Does anyone have a recommendation for a low-emf room fan to keep
>>> cool for the summer? Is there any such thing? Would a battery powered one
>>> be better? What do you all use for fans?
>>>>
>>>> Thanks!
>>>>
>>>
>>>
>>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>> ------------------------------------
>>
>> Yahoo! Groups Links
>>
>>
>>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

> **
>
>
> On May 22, Bill Bruno <[hidden email]> wrote:
> > But the meduim sized Vornado fan (I think it was over $60)
> > does have a nice motor (3 speeds, using different windings).
>
> We have Vorndado fans, so I guess when I say that I haven't
> noticed any problems with fans, I should also note that we
> use 3-speed fans from Vornado. :-)
>
> Marc
>  
>

>
> What you want is an AC motor with symmetrical coil windings.
> It will still have a strong magnetic field at close range but will drop off
> very fast at longer distance.  DC fans radiate RF.  I want to Bed Bath and
> Beyond and the smaller fans were all the "open frame" or C-frame motors,
> and the fields of those drop off slowly because they are not symmetric.
> One of them  (second smallest?) I couldn't see the motor until I got it
> home and looked carefully but it was also asymmetric.  But the meduim sized
> Vornado fan (I think it was over $60) does have a nice motor (3 speeds,
> using different windings).  Don't get one with continuously variable
> speeds.  I also have a Honeywell heater that has a decent fan motor.
> Motors with permanent magnets and built in controllers should be
> avoided...they are essentially a DC motor with a switch mode power supply.
> These are becoming common in refridgerators unfortunately.