how long it take for an electromagnet to lose it magnetism?

Discussion in 'General Electronics Chat' started by mosahem, Jan 5, 2010.

  1. mosahem

    Thread Starter New Member

    Jan 5, 2010
    I am new member:)
    I want to know the expected time for an electromagnet to lose its magnetism if we put a diode "snubber". I know it depends on the number of turns and the current through its wire. But I suggest that 200 truns, 0.5 Amps current, radius of 1 cm and length of 5 cm is enough to do its job.

    I am waiting your reply.
    Last edited: Jan 5, 2010
  2. Duane P Wetick

    Senior Member

    Apr 23, 2009
    The decay time may be estimated by the ratio, L/R x 5. The inductance (L) will vary, however by the iron that is attached to the magnet. You can watch the decay time on a scope, if you have one.

    Cheers, DPW [ Everyone's knowledge is in-complete...Albert Einstein]