switch from DC to AC?

Discussion in 'General Electronics Chat' started by ElectromagnetNewbee, Oct 14, 2014.

  1. ElectromagnetNewbee

    Thread Starter Member

    Jul 13, 2014
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    0
    im working with electromagnets using DC only.

    I want to start using AC from the wall outlet.

    What do i need to know about AC when using and working with electromagnetic fields?

    What are the differences i need to be aware of?
     
  2. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,039
    1,667
    More energy and much bigger sparks! ;)
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    With AC the current is limited to the inductive reactance which includes any metalic attracted item, also as a rule some method has to be used to prevent drop out of any attracted object due to the AC transition through zero.
    One method is a single turn copper shading coil.
    Max.
     
  4. JDT

    Well-Known Member

    Feb 12, 2009
    658
    85
    The rectified AC current will, of course, drop to zero every half cycle.

    But if you connect a reversed diode across your electromagnet, the inductance will cause the current to continue to flow through the coil and this diode during this time. Therefore the magnetic field will be fairly constant. No buzzing!

    Are we allowed to recommend using mains voltages? Thought there was a rule against this.
     
  5. BR-549

    Well-Known Member

    Sep 22, 2013
    2,004
    394
    As I have always said, modern science needs exceptions to the rules.
     
  6. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,015
    1,531
    Due to the OP refusing to take and follow other suggestions or to do any research on his "electromagnetics" threads, I predict a 'Darwin Award' in his near future. Especially since he is moving on to mains voltages. :)
     
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