From: jeroen@nospam.please   
      
   On 2021-08-27 14:37, Tom Del Rosso wrote:   
   > Jeroen Belleman wrote:   
   >> On 2021-08-27 08:07, Tom Del Rosso wrote:   
   >>> Jeroen Belleman wrote:   
   >>>> On 2021-08-26 04:25, Tom Del Rosso wrote:   
   >>>>> Jeroen Belleman wrote:   
   >>>>>> Tom Del Rosso wrote:   
   >>>>>>> AIUI you use iron cores for low frequency and ferrite for high   
   >>>>>>> frequency because ferrite doesn't get magnetized, so why couldn't   
   >>>>>>> aluminum do the same?   
   >>>>>>   
   >>>>>> You *want* a transformer core to be easily magnetized! You don't   
   >>>>>> want it to *stay* magnetized when the current goes to zero.   
   >>>>>   
   >>>>> Of course that's what I meant. It has to conduct a magnetic field   
   >>>>> but it must not fight the induced field when it reverses.   
   >>>>>   
   >>>>> I asked about the behavior of ferrite vs aluminum.   
   >>>>>   
   >>>>>   
   >>>>   
   >>>> The short answer is that aluminium is worse than nothing as a   
   >>>> transformer core. It *will* fight changing fields.   
   >>>   
   >>> That implies that it will "stay magnetized" as you put it, so the   
   >>> answer is too short but thanks for trying.   
   >>>   
   >>>   
   >>   
   >> Aluminium is a good conductor. There will be eddy currents induced   
   >> in it that will oppose any /change/ of magnetic field. Lenz law and   
   >> all that.But once external fields are removed and enough time has   
   >> passed for eddy currents to decay, there will be no field left over.   
   >   
   > I know what you mean, but since the current only has the length of the   
   > core to travel it's hard to grasp how that produces more than a very   
   > short pulse.   
   >   
      
   I'm getting a bit tired of this. Learn about magnetic fields in   
   conductors. You're in for some surprises, I'm sure.   
      
   Jeroen Belleman   
      
   --- SoupGate-Win32 v1.05   
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