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# SPS-Motor Analyse and first welcome

- To: femm@yahoogroups.com
- Subject: SPS-Motor Analyse and first welcome
- From: "dieter_wuertenberger" <dieter_wuertenberger@yahoo.com>
- Date: Fri, 02 Aug 2002 10:58:44 -0000
- User-agent: eGroups-EW/0.82

    Hello David,

    gratulation for Your FEMM-software.

    In the last weeks I did some optimization on very special DC-motors
    with FEMM.
    The type of motors I investigated are separated phase sector (SPS)
    machines, first published from:
    THREE-PHASE LOW-SPEED PERMANENT MAGNET
    SYNCHRONOUS MACHINES

    P.Zielinski, K.Schoepp
    Institute of Electrical Machine Systems
    Technical University of Wroclaw
    ul. Smoluchowskiego 19, 50-372 Wroclaw, Poland, 1991

    and later on adapted for model pilot purpose by three german
    afficionados (... LRK-motors).

    This motors have 6 coils and 7 permanent magnet polepairs. There
    speed of rotation is 7-times decreased re polepair=1 of standard 3-
    phase motors, very optimal for low speed, high efficient airscrews in
    model airplanes. This motors are very popular today, supported with
    easy to assemble selfmade kits.

    The most used brush-motor cores in this kits are not optimal for SPS
    machines.
    So I have developed with FEMM better core-geometries/magnet
    arrangements.
    (see SPS_Motor.zip : LRK31_Mot2.fem with LRK1.lua/LRK1-post.lua )

    After the static analyse I want to compute some harmonic effects.
    To do this I have some questions :

    1. How can I model the windings (winding_classic.jpg) with "circuit"
    properties in FEMM to get eddy losses - mainly the loss of core ?

    2. Is the eddy loss calculation in FEMM also accurate for my
    application ?
    Block#1 (magnets+Fe-ring) rotate around block#0 ?
    (--> rotating 3-phase field of stator delta-winding with superposed
    slightly oscillating field of rotating permanent magnets)

    This to my questions for the moment, here some feedbacks to FEMMVIEW:

    1. For static problem analysis it would be usefull to have B and J
    density together in one plot.

    2. To have a optical clear and significant information of saturated
    areas with B>B_sat I have modified the color-table, so that we have
    from B=0 to B=B_ub-dta green/brown colors: For saturated areas we
    have then pure red.
    Unfortunately this feature is only available with postLUA !
    We have to set B_lb=0 and B_ub=B_sat+(B_sat/11) in showdensityplot.
    Color-Table:
    <Color0> = 255	0	0
    <Color1> = 215	74	7
    <Color2> = 215	94	7
    <Color3> = 215	114	7
    <Color4> = 215	134	7
    <Color5> = 215	154	7
    <Color6> = 215	174	7
    <Color7> = 215	194	7
    <Color8> = 215	214	7
    <Color9> = 215	234	7
    <ColorA> = 215	254	7
    <ColorB> = 255	255	255

    3. To select the output position/format of density plots for AVI-
    outputs I have added the
    config-parameters:
    <WinLeft>	= 10
    <WinTop>	= 20
    <WinWidth>	= 500
    <WinHeight>	= 483
    in femmview.cfg and femmwiew software.

    4. It would be informativ to have the "ProblemNote" Comment-String
    (one line) on top of all plots.

    Feedback to FEMM:
    It would be usefull to have a instruction how to replace permanent
    magnets by coils for harmonic studies.
    (geometrie of coil arrangement/mesh-density/precision/current)

    I found the best fitting parameters only by adaptiv variations.
    See files HR383_Magnet.fem (static) <---> HR383_Coil.fem (harmonic)

    Default: How is software feedback in the FEMM-group arranged ?

    Upload-file : SPS_Motor.zip

    Sincerely, D. Wuertenberger

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