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TrainingSessiononEnergyEquipmentElectricMotorsPresentationfromthe“EnergyEfficiencyGuideforIndustryinAsia”P2006ElectricalEquipment/ElectricMotors1©UNEP2006TrainingAgenda:ElectricMotorsIntroductionTypesofelectricmotorsAssessmentofelectricmotorsEnergyefficiencyopportunitiesElectricalEquipment/ElectricMotors2©,fan,pressorsLiftmaterialsMotorsinindustry:70%ofelectricalloadWhatisanElectricMotor?ElectricalEquipment/ElectricMotors3©UNEP2006IntroductionHowDoesanElectricMotorWork?ElectricalEquipment/ElectricMotors(Nave,2005)12344©UNEP2006IntroductionThreetypesofMotorLoadElectricalEquipment/ElectricMotorsMotorloadsDescriptionExamplesConstanttorqueloadsOutputpowervariesbuttorqueisconstantConveyors,rotarykilns,constant-displacementpumpsVariabletorqueloadsTorquevarieswithsquareofoperationspeedCentrifugalpumps,ools5©UNEP2006TrainingAgenda:ElectricMotorsIntroductionTypesofelectricmotorsAssessmentofelectricmotorsEnergyefficiencyopportunitiesElectricalEquipment/ElectricMotors6©UNEP2006TypeofElectricMotorsMotorsarecategorizedonthebasisofinputsupply,constructionandoperationprincipolesTEXTClassificationofMotorsElectricalEquipment/ElectricMotorsElectricMotorsAlternatingCurrent(AC)MotorsDirectCurrent(DC)MotorsSynchronousInductionThree-PhaseSingle-pound7©UNEP2006TypeofElectricMotorsFieldpoleNorthpoleandsouthpoleReceiveelectricitytoformponentsElectricalEquipment/ElectricMotors(DirectIndustry,1995)8©UNEP2006TypeofElectricMotorsSpeedcontrolwithoutimpactpowersupplyqualityChangingarmaturevoltageChangingfieldcurrentRestricteduseFewlow/mediumspeedapplicationsClean,non-paredtoACmotorsDCmotorsElectricalEquipment/ElectricMotors9©UNEP2006TypeofElectricMotorsRelationshipbetweenspeed,fieldfluxandarmaturevoltageDCmotorsElectricalEquipment/icforce:E=KNTorque:T=KIaE=icforcedevelopedatarmatureterminal(volt)=fieldfluxwhichisdirectlyproportionaltofieldcurrentN=speedinRPM(rev