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# RE: [femm] Inductance variation with rotor position in permanent magnet machine

- To: <femm@yahoogroups.com>
- Subject: RE: [femm] Inductance variation with rotor position in permanent magnet machine
- From: "ramon bargallo" <Ramon.Bargallo@upc.es>
- Date: Mon, 20 Jan 2003 09:24:39 +0100
- Importance: Normal
- In-reply-to: <b0d399+hpg0@eGroups.com>

    HI,

    The inductance calculation via the flux method has errors due the
    calculation of this flux.

    The energy method is more exactly due the methodology used in FE method.

    Energy = (m/2)*L*I^2

    m: number of phases
    L: inductance
    I: current RMS value!

    Steps on inductance determination:

    1) aply set of current to produce a direct field (file: 00-36.fem)
    2) calculate the energy in the gap.
    3) Ld = Energy/((m/2)*I^2)
    4) aply set of current to produce a quadrature field or rotate the rotor
    180/(2p) (file: 45-36.fem)
    5) calculate the energy in the gap.
    6) Lq = Energy/((m/2)*I^2)

    the model attached: synchronous machine; S = 6 kVA; m = 3; V = 220 V; 2p =
    4; nominal current (RMS value): I = 15.75 A; number of
    conductors/(slot&layer): 6.

    Bye.

    Ramon Bargallo
    Director U.E. d'Electricitat
    E.U.E.T.I.B.
    C/Urgell, 187
    08036 Barcelona
    Tel.(34) 934137411
    Fax.(34) 934137401
    Ramon.Bargallo@upc.es

    -----Mensaje original-----
    De: raymondong66 <raymond.ong@myprimus.com>
    [mailto:raymond.ong@myprimus.com]
    Enviado el: domingo, 19 de enero de 2003 3:42
    Para: femm@yahoogroups.com
    Asunto: [femm] Inductance variation with rotor position in permanent
    magnet machine

    Hello:

    I am interested in calculating d axis inductance and q_axis
    inductance in permanet magnet rotating machine and their variation
    using finite element method. I am wondering whether anybody had done
    such calculation and I would like to hear from anyone on this subject.
    I have used commercial FE package and use transformation method of
    phase inductance to d and q axis inductance, stored energy method and
    flux linkage method and each of them provide different answer. Any
    opnion why these are so?

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    - From: "raymondong66 <raymond.ong@myprimus.com>" <raymond.ong@myprimus.com>

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