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Filter Question! How to get rid of SPIKES!

Discussion in 'Electronic Design' started by Victor hyppolito, Jan 27, 2007.

  1. Hello,

    I have a 60Hz AC voltage comming from a transformer 120/220V that
    powers some cooling fans, but it's got some spikes at the output, and
    Im having problems with that. The spikes are burning the fans.

    Here is the link of the wave form: http://br.geocities.com/suellemtosi/
    wave.jpg

    What the main problem is at 2Khz, am I right?

    I want to make a filter to attenuate those spikes, but I´ve never done
    a filter for voltages above 12V. I know just how to use op-amps, but
    for 220V Its got to be a passive filter.

    Does anybody have an idea of what type of filter would be more
    appropriate? Low pass, tuned filters....

    I have JUST some 3,9mH inductors to make it, the other components can
    be anything to match the configuration.

    Anything will be helpful!!!
    Thanks a lot!
    Victor
     
  2. Phil Allison

    Phil Allison Guest

    ** Groper Alert


    I have a 60Hz AC voltage comming from a transformer 120/220V that
    powers some cooling fans, but it's got some spikes at the output, and
    Im having problems with that. The spikes are burning the fans.


    ** What exactly is burning ?

    The brushes in the fan motors ?



    Here is the link of the wave form:

    http://br.geocities.com/suellemtosi/wave.jpg


    ** Looks like commutation noise spikes from a brush ( AC/DC ) motor.


    ** Not even close.


    I Does anybody have an idea of what type of filter would be more
    appropriate? Low pass, tuned filters....


    ** Try using a capacitor wired across each motor.

    Start with a 100nF, 250 volt AC rated cap and increase the value as
    needed.

    But that will not stop brushes burning.



    ....... Phil
     
  3. Tam/WB2TT

    Tam/WB2TT Guest

    Fix the problem that is causing the spikes, which may or may not be causing
    the fans to burn out.

    Tam
     
  4. Phil Allison

    Phil Allison Guest

    "Tam/WB2TT"



    ** Go tell the OP that one - not me.





    ........ Phil
     
  5. Phil, would you kindly just give it a rest? Since when
    are _you_ representing the s.e.d. community?
     
  6. Phil Allison

    Phil Allison Guest

    "Winfield Hill"

    ** As usual - Win has totally misread the thread.

    TAM carelessly posted his dopey remark to ME.

    It should have been to the OP.



    ** There is no " s.e.d community " and no-one represents a NG.

    Clearly, YOU falsely imagine there is and YOU falsely imagine that YOU do.

    How grandiose & delusional of you.

    Got any more asinine fallacies you feel like getting off your chest today -
    Win ??




    ........ Phil
     
  7. Like I said, would you kindly just give it a rest? We're tired
    of reading your gratuitous outbursts. When making a simple
    conversation in these threads, it's certainly not necessary
    to make every comment exactly under and in response to the
    person being commented to, get it? We could all see that
    Tam was responding to Victor suggesting he fix the problem
    that was causing the spikes, and we didn't need to see your
    lecture about exactly where in the thread he should have
    made his innocent post. In fact, it appears to me Tam was
    seconding to Victor your suggestion of placing a capacitor
    across the motor, and if so, his comment after your post was
    a good place for it. This is just usenet, after all, so
    please do kindly give it a rest. Sheesh!
     
  8. Phil Allison

    Phil Allison Guest

    "Winfield Hill - Blowing Smoke Out His Arse "


    ** Go straight to hell, you posturing pommy ass.


    ** Yawn - speak only for yourself, you posturing pommy ass.

    There is no " s.e.d community " and no-one represents a NG.

    Clearly, YOU falsely imagine there is and YOU falsely imagine that YOU do.

    How grandiose & delusional of you.

    Go straight into hell.




    ** NG posting is not a conversation.

    Yet another of your asinine fallacies.


    ** Yawn - yet another asinine fallacy.


    ** Not again !!!!!

    Speak only for yourself, you posturing pommy ass !!!!



    ** And another one !!!!!

    Speak only for yourself, you posturing pommy ass !!!

    There is no " s.e.d community " and no-one represents a NG.

    Clearly, YOU falsely imagine there is and YOU falsely imagine that YOU do.

    How grandiose & delusional of you.



    ** The phrase: " Go tell the OP that one - not me. " simply aint any
    kind of a lecture.

    How grandiose & delusional of you to pretend it is.

    Go straight into hell.



    ** Yawn - who the hell cares what a grandiose, delusional pommy wanker
    imagines ?

    Until the OP returns and says exactly what kind of motors he has, commenting
    further on his post is a waste of time.



    Mr Hill:

    Berating me over one simple and quite fair comment is

    UTTERLY INSANE !!!!!

    **** OFF you boring old Wind Bag !!




    ........ Phil
     
  9. Tam/WB2TT

    Tam/WB2TT Guest

    I know that, but you are the only poster that shows up on this subject. I
    hoped that the OP would look at your response, and see my comment. It is not
    dopey; if the spikes are actually causing the fans to blow, they are causing
    other problems also.

    Tam
     
  10. Phil Allison

    Phil Allison Guest

    "Tam/WB2TT"



    ** Thankyou for your most honest reply.

    Which ** alone ** justifies my comment in response.

    " Go tell the OP that one - not me."



    ** OK - so the only horse in sight must carry the load .....

    Which third word fucking shit hole is that philosophy from ??



    ** Hoping is just not good enough.

    Be aware of WHO you are addressing in future -

    lest your fuckwit remarks get you in the poo again.


    ** It was as dopey as all hell.


    ** What do you do for a living ?

    Collect bus tickets maybe ??

    Piss off.




    ....... Phil
     
  11. Rich Grise

    Rich Grise Guest

    Win, you need to get out more. ;-)

    Cheers!
    Rich
     
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