Page - 32 - in Emerging Technologies for Electric and Hybrid Vehicles

Energies 2017,10, 1217 Figure37.SynRMwithaxially laminatedrotor [23]. 5.7. PMAssistedSynchronousReluctanceMotor GreaterpowerfactorscanbeachievedfromSynRMsbyintegratingsomePMsintherotor,creating aPMassistedSynchronousReluctanceMotor. Thoughit is similar toanIPM, thePMsusedare fewer inamountandthefluxlinkages fromthemare less too. PMsaddedin therightamount to thecoreof therotor increase theefficiencywithnegligiblebackEMFandlittlechangeto thestator. Thisconcept is free from the problems associatedwith demagnetization resulting fromoverloading and high temperatureobservedinIPMs.Withaproperefficiencyoptimizationtechnique, thismotorcanhave theperformancesimilar to IPMmotors.APM-assistedSynRMsuitable forEVusewasdemonstrated byBRUSAElektronikAG(Sennwald,Switzerland). Like theSynRM,PM-assistedSynRMscanalsoget betterwith improveddesigntechniques, control systemsandadvancedmanufacturingsystems[23]. Ademonstrationof therotorofPM-assistedSynRMisshowninFigure38. Figure 38. Permanent magnet (PM) assisted SynRM. Permanent magnets are embedded in the rotor [23]. 32