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Design and Analysis of a Fractional-Slot Concentrated-Wound PM-Assisted Reluctance Motor
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Konstruktion och analys av en permanent magnetiserade synkronreluktans motor med koncentrerad lindning (Swedish)
Abstract [en]

The aim of this master thesis is to design and analyse a FSCW PMaSynRM (Permanent

Magnet assisted Synchronous Reluctance Motor) for industrial applications. The design

process includes analytical calculations (initial design and PM amount minimization)

and nite element method (FEM) based design optimization. An overcompensated

design is proved to be advantageous for a 10-pole reluctance motor. A comparative

analysis with other rotor topologies was made, where motor performance, temperature

e ects and production costs are taken into account. Detailed curves which describe

eciency, power factor and current with respect to ambient temperature are studied for

the proposed motor designs at di erent working points. The demagnetization risk is

also taken into account and the safe working temperature ranges have been dened for

all the considered motors.

The results show that the initial motor design with 10 poles/12 slots PMaSynRM with

NdFeB magnets has poor performance in terms of eciency and power factor, with

huge amount of PM inserted. This is mainly due to the lack of reluctance torque for this

relatively higher number of poles solution. Moreover, it has been found in literature and

conrmed in this investigation that this negative e ect for the 10-pole motor is amplied

due to the presence of the concentrated winding. Indeed, it is shown by simulations

that the motor performance is improved by employing 8 poles/12 slots PMaSynRM

conguration with a relatively lower NdFeB magnet amount, thanks to the improved

rotor anisotropy. The 10 poles/12 slots interior permanent magnet (IPM) and surface

mounted permanent magnet (SMPM) topologies present higher performance due to the

e ective utilization of PM, mainly or completely producing the torque. Hence, IPM and

SMPM do not su er the lack of anisotropy.

Abstract [sv]

Syftet med detta examensarbete ar att utforma och analysera en FSCW PMaSynRM

(Permanent Magnet assisted Synchronous Reluctance Motor) for industriella applikationer.

Designprocessen omfattar analytiska berakningar (ursprungliga konstruktion och

PM belopp minimering) och nita elementmetoden (FEM) baserad design optimering.

En overkompenserad design visat sig vara fordelaktigt for en 10-polig reluktansmotor.

En jamforande analys med andra rotor topologier gjordes, dar motor prestanda, temperature

ekter och produktionskostnader beaktas. Detaljerade kurvor som beskriver

e ektivitet, e ektfaktor och strom med avseende pa omgivningstemperatur studeras for

de foreslagna motorn for vid olika arbetspunkter. Den avmagnetisering risken ocksa

beaktas och sakerhetstemperaturomraden har denierats for alla ansag motorerna.

Resultaten visar att den initiala motordesign med 10-polig/12 spar PMaSynRM med

NdFeB magneter har daliga e ektivitet och e ektfaktor, med enorma mangder PM insatt.

Detta ar framst pa grund av bristen pa reluktansvridmomentet for denna relativt

hogre poltal losning. Dessutom har man funnit i litteraturen och bekraftat i denna unders

okning att denna negativa e ekt for 10-polig motorn forstarks pa grund av narvaron

av den koncentrerade lindningen. Faktum ar att det framgar av simuleringar att motorprestanda

forbattras med en 8-polig/12 spar PMaSynRM konguration med en relativt

lagre NdFeB magnet belopp, tack vare den forbattrade rotor anisotropi. Den 10-polig/12

spar interior permanentmagnet (IPM) och ytmonterade permanent magnet (SMPM)

topologier presentera hogre prestanda tack vare ett e ektivt utnyttjande av PM och

deras produktion vridmoment, huvudsakligen eller helt anfortrotts PM effekten.

Place, publisher, year, edition, pages
2015. , 125 p.
EES Examensarbete / Master Thesis, TRITA XR-EE-E2C 2015:003
Keyword [en]
concentrated windings, demagnetization, distributed windings, ferrite, finite element method, loss distribution, natural and over compensation, overlaod, permanentmagnet assisted synchronous reluctance motors, permanent magnets, rare earth magnets (NdFeB), reluctance torque, temperature effects, torque ripple
Keyword [sv]
avmagnetisering, ferrit, finita elementmetoden, fördelade lindningar, förlust distribution, koncentrerade lindningar, momentrippel, naturligt och överkompensation, permanentmagnet assisterad synkron reluktansmotorer, permanentmagneter, reluktansvridmomentet, sällsynta jordmagneter (NdFeB), temperatureffekter, överbelastning
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-170441OAI: diva2:835253
Educational program
Master of Science in Engineering - Electrical Engineering
Available from: 2015-06-30 Created: 2015-06-30 Last updated: 2015-06-30Bibliographically approved

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