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Design of a Synchronous Reluctance Motor Assisted with Permanent Magnets for Pump Applications
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 av en synkronreluktans motor med permanent magneter för pumpar (Swedish)
Abstract [en]

This Master thesis focuses on the design of a high efficiency Permanent-Magnet-Assisted

Synchronous Reluctance Motor (PMASynRM) intended for pump applications. The new motor is

designed to replace an existing Induction Motor (IM) in a pump product.

The basic principles of SynRM, and PMASynRM Motors and a good analytical model were

introduced. Due to the complexity and high non-linearity of this specific electrical machine, Finite

Element Method (FEM) and an analytical model were combined. First, a parameter sensitivity

analysis was carried out with the software SPEED. However, SPEED does not give appropriate

results for the sensitivity analysis of the distance from the shaft to the first barrier, and in this

case, the FEM software FLUX was used instead. Using FEM as well, the risk of demagnetization

of the magnets was controlled for the nominal current and for overload conditions. Furthermore,

some conclusions were drawn in terms of the losses, and efficiency for the selected design. The

design fulfills the required efficiency placing either ferrite or neodymium iron bore magnets in

the rotor barriers. However, if ferrite magnets are employed, the maximum current should be

controlled to avoid demagnetization.

Finally, a ferrite PMASynRM prototype was built and tested in the lab. The simulation results as

well as the measurement of other possible technologies including IM and Line Start Permanent

Magnets (LSPM) machine were compared with the measurements of the prototype in terms of

efficiency, power factor and cost. It is concluded that the designed PMASynRM is a good

alternative as it surpassed the required efficiency and the results from the simulation were close

to the test measurements.

Abstract [sv]

Detta examensarbete fokuserar på konstruktion av en högverkningsgradmotor av typen

Permanent-Magnet-Assisterad Synkronreluktansmotor (PMASynRM) avsedd för

pumpapplikationer. Syftet är att asynkronmotorn i befintliga pumpar ska bytas ut mot den nya

konstruktionen.

På grund av maskinens komplexitet och dess höga olinjäritet kombinerades Finite Element

Modelling metoden (FEM) och en analytisk metod. Till en början genomfördes en

parameterberoende analys med SPEED för att komma fram till hur modellens olika parametrar

påverkar maskinens prestanda. FEM beräkning gav mer pålitligt resultat för parameterstudie när

det gällde avståndet från axeln till den första barriären (jämför med SPEED). Detta val hade

fördelen att man även kunde studera avmagnetiseringsrisken vid märkström samt undersöka vid

vilken ström magneterna faktiskt avmagnetiserades. Därutöver drogs slutsatser om

verkningsgrad, prestanda och förluster. PMASynRM uppfyller önskad verkningsgrad med ferrit

eller neodymmagneter. Om ferritmagneter används bör den maximala strömmen kontrolleras

för att undvika avmagnetisering.

Till slut byggdes och testades en PMASynRM prototyp. Resultaten från simulationen samt

mätningarna av andra möjliga teknologier, som asynkronmotor och nätstartande

permanentmagnetiserad motor (LSPM), jämfördes med mätningarna av prototypen med

avseende på verkningsgrad, effektfaktor och kostnad. Slutsatsen är att PMASynRM är ett bra

alternativ eftersom den överträffade den önskade verkningsgraden och eftersom resultaten från

simulationen låg mycket nära testmätningarna.

Place, publisher, year, edition, pages
2015. , 97 p.
Series
EES Examensarbete / Master Thesis, TRITA XR-EE-E2C 2015:004
Keyword [en]
Demagnetization study, efficiency, FEM, parametric study, Permanent-Magnet Assisted Synchronous Reluctance Motor, prototype
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-163280OAI: oai:DiVA.org:kth-163280DiVA: diva2:799523
External cooperation
Xylem
Educational program
Master of Science in Engineering - Electrical Engineering
Examiners
Available from: 2015-03-31 Created: 2015-03-31 Last updated: 2015-03-31Bibliographically approved

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