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# Re: [femm] complex inductance???

- To: <femm@yahoogroups.com>
- Subject: Re: [femm] complex inductance???
- From: "Erdal Bizkevelci" <erdal903@yahoo.com>
- Date: Fri, 5 Oct 2001 10:22:06 +0300
- References: <20011003151004.7944.qmail@web10904.mail.yahoo.com> <3BBB68B3.5E021EF2@foster-miller.com> <001b01c14cdd$3c50dba0$4ca77a90@eee.metu.edu.tr> <3BBC7C24.5E79E71F@foster-miller.com>

Thanks Mr. Meeker for the comprehensive explanation. Now I have the following question: We have two methods to calculate inductance: 1) using the integral of A.J over the current carrying coils: Results: integral of A.J = [(8.31e-4) -(j7.99e-6)] Henry Amp^2 current=225 Amper-Turn gives an inductance of L=[(3.69 e-6)- (j3.55 e-8)] Henry 2) using the integral of magnetic energy. integral of magnetic field energy over thewhole area (instead of current carrying components)=2.081 e-4 joule current=225 Amper-Turn gives an inductance of L=[1.849 e-6] Henry Now ignoring the imaginary part of the first solution (so the eddy currents and the hysteresis losses) which one should be taken as the inductance? 3.69 mH or 1.84 mH? Thanks in advance.

- References:
  - H in magnets
    - From: marco valcavi <mvalca@yahoo.com>
  - Re: [femm] H in magnets
    - From: David Meeker <dmeeker@foster-miller.com>
  - complex inductance???
    - From: "Erdal Bizkevelci" <erdal903@yahoo.com>
  - Re: [femm] complex inductance???
    - From: David Meeker <dmeeker@foster-miller.com>

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