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# [FEMM] FILL FACTORY

- To: FEMM <femm@list.foster-miller.net>
- Subject: [FEMM] FILL FACTORY
- From: Santiago Salamanca <santiago@salamanca.de>
- Date: Mon, 16 Feb 2004 13:03:46 +0100
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    Hi, everyone.

    Dr. Meeker write:
    You have to multiply the conductivity of the bulk coil material
    by the
    fill factory and enter that value as the conductivity for a
    wound
    region.

    Well.
    With FEMM i have calculated a sample coil with 5 turns
    "coil5t.femm",fill factory=0.83
    The coil material has a conductivity=46.73 MS/m.
    If i multiply the conductivity by SQRT(fill factory),(and not
    only by fill factory)
    and i enter the conductivity =46.73*SQRT(0.83)=42.57MS/m ,the
    results are:

    Total current = 13052.1 - j 74325.1 Amps  (AMPLITUDE)
    Voltage Drop = 71.0381 + j 0.107124 Volts
    Flux Linkage = 0.0385309 - j 0.219415 Webers
    Flux/Current = 2.95209e-006 - j 1.05879e-022 Henries
    Voltage/Current = 0.000161422 + j 0.000927428 Ohms
    Real Power = 459616 Watts
    Reactive Power = 2.64066e+006 VAr
    Apparent Power = 2.68036e+006 VA
    Real Power = 459616 Watts        =459.616 kW
    Reactive Power = 2.64066e+006 VAr=2640.66 kVar
    Apparent Power = 2.68036e+006 VA

    the same results as with an another femm-program:
    Voltage=50.0 + j0.0 Volts as INPUT
    Coil material has a conductivity=46.73 MS/m as INPUT
    The results are:
    Total current =929.2 -j 5255.8 Amps(efectiv)= 13052.1 - j
    74325.1 Amps (AMPLITUDE)
    Voltage/Current = 1.621E-04 + j 9.229E-04 Ohms
    Real Power =461.5 kW
    Reactive Power =2627.8 kVar

    The real power 459kW (61.5kW), the reactive power 2640.66
    kVar(2627.8kVar) and the
    Voltage/Current are practically the same!

    It is that "conductivity by SQRT(fill factory"  OK or an error
    from me?

    Thanks

    Santiago Salamanca

Attachment: `coil5t.fem`
Description: Binary data

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