Re: Power Supply Rectification and Smoothing

On Sat, 20 Oct 2007 04:16:00 +0100, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:

What's the "ripple rejection" of a motor or mosfet switch ?

Or even, what's the power output of a 500W motor? :)

But I digress.

To get back to your appalling logic:

What you are saying is that there is no such concept as "robustness
against ripple"

OK, so far?

Now it logically follows from this, that every electrical machine must
be either totally indifferent to any amount of ripple OR totally
destroyed by any ripple.

If any such machine varied from these absolutes, then it means that a
degree of "robustness against ripple" has been introduced, and you are
claiming that there is no such thing.

So I imagine you are choosing the extreme where every electrical
machine is totally indifferent to any amount of ripple. Afterall, you
have already claimed my motor controller as such.

Thus, if all such machines are totally indifferent to any amount of
ripple, no power supply need ever include smoothing.

Can you therefore explain why so many go to such lengths to smooth
their outputs?

jack
.

Relevant Pages

  • Re: Filtering a tachometer generator
    ... whose output is proportional to rpm. ... the ripple is easily dealt with. ... The filter needed to smooth the ripple at 1 rpm ... > filter whose cutoff and group delay track the motor speed. ...
    (comp.dsp)
  • Re: Power Supply Rectification and Smoothing
    ... Remember that this is the minimum required capacitance." ... ripple, and others have chosen different ripples. ... Anything to do with DC brushed motor, speed controllers? ...
    (sci.electronics.basics)
  • Re: Filtering a tachometer generator
    ... whose output is proportional to rpm. ... the ripple is easily dealt with. ... The filter needed to smooth the ripple at 1 rpm ... > filter whose cutoff and group delay track the motor speed. ...
    (comp.dsp)
  • Re: Filtering a tachometer generator
    ... whose output is proportional to rpm. ... the ripple is easily dealt with. ... The filter needed to smooth the ripple at 1 rpm ... > filter whose cutoff and group delay track the motor speed. ...
    (comp.dsp)
  • Filtering a tachometer generator
    ... These antediluvian devices suffer from commutator ripple, which can have nasty effects on feedback loops. ... The filter needed to smooth the ripple at 1 rpm introduces enough delay at 1000 rpm to have a noticeable -- possibly unacceptable -- effect on stability. ... We want a lowpass filter whose cutoff and group delay track the motor speed. ...
    (comp.dsp)
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