ENOCK MULENGA

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  • in reply to: Skin Effect #12842
    ENOCK MULENGA
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    Skin effect is the tendency of an alternating electric current (AC) to distribute itself within a conductor with the current density being largest near the surface of the conductor, decreasing at greater depths. The electric current flows mainly at the “skin” of the conductor, between the outer surface and a level called the skin depth. The skin effect causes the effective resistance of the conductor to increase at higher frequencies where the skin depth is smaller, thus reducing the effective cross-section of the conductor. The skin effect is due to opposing eddy currents induced by the changing magnetic field resulting from the alternating current. At 60 Hz in copper, the skin depth is about 8.5 mm. At high frequencies the skin depth becomes much smaller. Increased AC resistance due to the skin effect can be mitigated by using specially woven litz wire. Because the interior of a large conductor carries so little of the current, tubular conductors such as pipe can be used to save weight and cost.

    in reply to: electrical machinary #12841
    ENOCK MULENGA
    Participant

    1. ELECTRIC MACHINERY
    by A.E. Fitzgerald,  Charles Kingsley Jr, Stephen Umans

    2. ELECTRIC MOTORS AND DRIVES

    by Austin Hughes

    3. Books written by U.A.Bakshi, A.V.Backshi, K.A.Backshi

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