Electromagnet query

Discussion in 'Homework Help' started by GARYN, Mar 27, 2010.

  1. GARYN

    Thread Starter Member

    Sep 4, 2009
    Can someone please explain what is probaly a very stupid question but it does puzzle me, i am an ex house electrician now working in a factory faultfinding in panels.
    Why do AC coils, AC electromagnets not chatter in and out due to the changing magnetic field?

    Thanks in advance....
  2. k7elp60

    AAC Fanatic!

    Nov 4, 2008
    Most likely as they have a shader pole. It is generally a copper slug around the armature on one end. It prevents the magnetic field from going to 0 when the polarity of the AC voltage reaches near 0 volts and changes polarity. Most relays and or solenoids can have a relative large change in applied voltage without causing them to deenergize.