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14
M.Barański,J.Kołowrotkiewicz
I[A]
-10
-20
-30
-40
40
30
20
10
0
0
0,05
0,1
0,15
obliczeniapolowe
0,2
0,25
pomiar
0,3
0,35
0,4
t[s]
Fig.7.Calculatedandmeasuredphasecurrentduringstartupofno-loadedmotorsup-
pliedfromvoltagesourceofRMSvoltagevalueUs=220V
Itisobviousfromtheaboveanalysisthattherelultsobtainedfromthecircuit-
fieldfiniteelementmodelareveryclosetomeasurements,thereforeanadequacy
ofthemodelelaboratedhasbeenconfirmed.Thediscrepancybetweencalculated
andmeasuredwaveformsisaresultofrelativelysmallmechanicalstiffnessofa
teststandwhatisparticularlyvisibleindynamicconditions.Bothshapeandmag-
nitudeofpredictedcurrentwaveformsinthesteady-statearenearlysamewith
thosemeasuredonthelaboratorymodelwhatconfirmsthecorrectnessofthemul-
tisliceskewapproximationtechnique.
4.CONCLUSIONS
Thispaperpresentsanempiricalverificationoftheafield-circuitmodelofa
squirrelcageinductionmotor.Theresultsofcalculationswerecomparedwithtest
resultsobtainedfromthelaboratorymodelshowinghighadequacyofthemathe-
maticalmodel.
Theaccuracyofsimulationresultsreliesmainlyuponproperestimationof
temperatureriseofsquirrelcagemotorparts.Ittakesroughly10secondstoper-
formthelocked-rotortestforvoltagerangefrom100Vto380V.Evenduringthat
shortperiodthetemperatureofstatorwindingmayrisebysome
80
0
C
.
Thehighaccuracyofsimulationresultswasachievedbecausetheeffectsof
temperaturevariationofthewindingweretakenintoaccount.Higherdiscrepancy
