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10
M.Barański,J.Kołowrotkiewicz
dimensionalmagneticfieldssolutions,butalgorithmssimulating3Dfieldphe-
nomenaarecomplicatedandtime-consuming.However,thecalculationprocedure
canbesimplifiediftherotorisslicedintoimaginarydisks.Suchanapproachal-
lowsforusingaquasi-threedimensionalmulti-discmodelwhereanassumptionof
two-dimensionalmagneticfielddistributionforeachdiscisintroduced.
Ahypotheticalsubdivisionoftherotorintothreediscsbyparallelplanes[1]
thatareperpendiculartotheaxiszispresentedinFig.1.
Fig.1.Skewapproximationbysubdivisionoftherotorintothreeslices
Itisassumedthattheelectromagneticfieldforalldisksistwo-dimensional.
Thesmoothlyskewedslotsthatappearinthiswayarereplacedwith“stepwise”
skewedslots.
3.VERIFICATIONOFACALCULATIONSBYMEASUREMENTS
Onthebasisofpresentedalgorithmacomputersoftwareforthefieldanalysis
ofinductionmotoroperationwaselaborated.Thecomputersoftwarewasapplied
tosimulatetheoperationofathree-phase,4-polemachinetypeSg100L-4B.
Thecomputersoftwaremakesitpossibletoanalysemotoroperationintran-
sientstatesundervariableloadconditions,andalsoallowsforaccountingforsup-
plyvoltagewaveformdistortion.Inthispaperwecomparetheresultsobtained
withthecomputersoftwaretothosetakenfromthelaboratorytestaswellasto
thoseobtainedonthebasisofclassicalcircuittheoryofinductionmachines.The
classicalequivalentelectriccircuitofaninductionmotor,isshowndepictedin
Fig.2.
