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Design and comparison of PMaSynRM versus PMSM for pumping applications
KTH, School of Electrical Engineering and Computer Science (EECS).
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This master thesis aimed to design a permanent magnet assisted synchronous reluctancemachine (PMaSynRM) rotor for pump applications which were to be implemented inan existing Induction Machine stator. The machine were to be compared with a similarpermanent magnet synchronous machine (PMSM) with similar torque production in termsof cost and performance.This thesis goes through the theory of the Synchronous Reluctance Machine andthe Permanent Magnet assistance. A rotor was designed by utilizing existing design approachesand simulation of performance by use of finite element analysis. A demagnetizationstudy was conducted on the added permanent magnets in order to investigate thefeasiblity of the design.The final design of the PMaSynRM was thereafter compared to the equivalentsurface-mounted PMSM in terms of performance and cost. The performance parameterswas torque production, torque ripple, efficiency and power factor. Due to the lower torquedensity of the PMaSynRM, for equal torque production the PMSM had a 40% shorterlamination stack than the PMaSynRM.The economic evaluation resulted in that when utilizing ferrite magnets in the PMa-SynRM it became slightly cheaper than the PMSM, up to 20%. However, due to the fluctuatingprices of NdFeB magnets, there exist breakpoints below which the PMaSynRM isin fact more expensive than the PMSM or where the price reduction of the PMaSynRMis not worth the extra length of the motor. However, it was shown that the PMaSynRMis very insensitive to magnet price fluctuations and thereby proved to be a more securechoice than the PMSM

Abstract [sv]

Detta examensarbete avsåg att designa en rotor till en permanentmagnetsassisteradsynkron reluktansmaskin (PMaSynRM) för pumpapplikationer, vilken skulle implementeras i en befintlig asynkronmaskin (IM) stator. Maskinen jämfördes ekonomiskt och prestandamässigt med en liknande synkronmaskin med permanentmagneter (PMSM) med jämförbar vridmomentsproduktion.Uppsatsen avhandlar teorin bakom synkrona reluktansmaskiner och konceptet kring permanentmagnetassistans. Rotorn designades genom användandet av befintliga designmetoder och simulering genom finit elementanalys (FEA). En avmagnetiseringsstudie utfördes på de adderade magneterna för att undersöka rimligheten kring designenDen slutgiltiga designen av PMaSynRMen jämfördes därefter mot den jämlika PMSMen i termer om prestanda och kostnad. De undersökta prestandaparameterarna var vridmoment, vridmomentsrippel, verkningsgrad och effektfaktor. Eftersom vridmomentsdensiteten i en PMaSynRM är lägre än hos en PMSM så visade sig PMSMen ha en 40% kortare lamineringskropp än PMaSynRMen vid jämnlik vridmomentsproduktion.Den ekonomiska utvärderingen resulterade i att vid användandet av ferritmagneter i PMaSynRMen så blev den något billigare än PMSMen, upp till 20%. På grund av fluktuerande priser hos NdFeB magneter, så finns det brytpunkter där PMaSynRMen faktiskt blir dyrare än PMSMen eller då kostnadsreduktionen för PMaSynRMen kan bedömas att vara för låg med tanke på den ökade längden och vridmomentsrippel. Däremot visades det att PMaSynRMen är väldigt okänslig för prisvariationer och därför visades vara ettkostnadsmässigt tryggare val än PMSMen

Place, publisher, year, edition, pages
2018. , p. 90
Series
TRITA-EECS-EX ; 2018:496
Keywords [en]
Demagnetization, economic evaluation, permanent magnet assistance, synchronous reluctance machine
Keywords [sv]
Avmagnetisering, ekonomisk utv¨ardering, permanentmagnetassistans, synkron reuktansmaskin
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-235279OAI: oai:DiVA.org:kth-235279DiVA, id: diva2:1249540
External cooperation
Xylem Water Solutions
Educational program
Master of Science - Electric Power Engineering
Examiners
Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-09-19Bibliographically approved

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