Danfoss TTS350

4.23 Motor Components
4.23.1 Function
Themotortypeemployedisapermanentmagnet,synchronousspeedmotor.Thewindingsectionofthemotoris
similarindesigntoastandard3-phasestar-connectedStator.
4.23.1.1 Stator
TheStatoroperatesastheforcethatdrivestheshaft,utilizingtheHVDCpulsesprovidedtothemotorwindingsby
theInverter.
4.23.1.2 Rotor
Therotorisanintegralpartofthemotorshaftandisapermanentmagnetdesignthatallowsthesynchronous
characteristicrequiredforbroadrangespeedcontrol.
4.23.2 Motor Protection
Conventionalmotorprotectionbasedonincoming3-phasecurrentsandvoltageconditionsareinadequateto
protectthemotorandelectronicsintheeventofmishapduetothetotalseparationofthemotorwindingsfromthe
incoming3-phasecurrentbytheDCconversion.Therefore,thebulkofprotectionisbasedonmeasurementstaken
bytheInverterandcalculationsderivedfromthosemeasurements.
MotorcurrentsandvoltagesdisplayedintheSMTcannotbedirectlycomparedorcorrelatedtoincoming3-phase
ACvalues.
AllStatorsemployoverheatcutoutprotectionutilizingthermistorsineachwinding.
4.23.3 Motor Connections
RefertoFigure4-217ConnectiontoStatorfordetailsontheconnectionsandserviceablecomponents.
Figure 4-217 Connection to Stator
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