Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
On Inter-bar Currents in Induction Motors with Cast Aluminium and Cast Copper Rotors
KTH, Skolan för elektro- och systemteknik (EES), Elektriska maskiner och effektelektronik.
2010 (Engelska)Licentiatavhandling, monografi (Övrigt vetenskapligt)
Abstract [en]

This thesis presents a study of the effects of inter-bar currents on inductionmotor starting performance and stray-load losses. The work is focused on theperformance differences between aluminium and copper casted rotors.A method to predict the stator current when starting direct-on-line isdeveloped. This includes modelling of skin-effect, saturation of the leakageflux paths and additional iron losses. The results are verified by measurements.An analytical model accounting for inter-bar currents is derived, andthe dependency of the harmonic rotor currents on the inter-bar resistivity isinvestigated. It is found that the inter-bar currents can have considerableeffect on motor starting performance and stray-load losses, the amount beingstrongly dependent on the harmonic content of the primary MMF.Based on measurements of inter-bar resistivity, the starting performanceof an aluminium and a copper casted rotor is simulated. The results indicatea higher pull-out torque of the aluminium rotor than for the equivalent copperrotor. This is rather due to an increase of the fundamental starting torque ofthe aluminium rotor, than due to braking torques from the space harmonicsin the copper rotor. The results are verified by measurements. It is foundthat the difference between the pull-out torques is even larger than calculatedfrom the model. Thereby, it can be concluded that the inter-bar currents havea considerable effect on motor starting performance.At rated speed the braking torques are larger in the aluminium rotor thanin the copper rotor. This is seen as increased harmonic joule losses in the rotorcage. Simulations have shown, that these losses can be as large as 1% ofthe output power for the studied machine.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH , 2010. , s. x, 78
Serie
Trita-EE, ISSN 1653-5146 ; 2010:027
Nyckelord [en]
Induction motors, Inter-bar currents, Copper rotors, Aluminium rotors, Starting torque, Asynchronous torques, Starting current, Stray losses
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:kth:diva-13401ISBN: 978-91-7415-682-9 (tryckt)OAI: oai:DiVA.org:kth-13401DiVA, id: diva2:325097
Presentation
2010-06-15, Sal E2, Lindstedtsvägen 3, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC20100617Tillgänglig från: 2010-06-17 Skapad: 2010-06-17 Senast uppdaterad: 2010-06-17Bibliografiskt granskad

Open Access i DiVA

fulltext(5550 kB)1904 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 5550 kBChecksumma SHA-512
008c01c6921e9ef048e0d0a04b07f7694964608065be1e48a0b37976506a0b5e8b7a4781a6c2a0a52c5594033a3beae65cc8d83bb1243710d6770efada0a7378
Typ fulltextMimetyp application/pdf

Sök vidare i DiVA

Av författaren/redaktören
Stening, Alexander
Av organisationen
Elektriska maskiner och effektelektronik
Elektroteknik och elektronik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 1904 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

isbn
urn-nbn

Altmetricpoäng

isbn
urn-nbn
Totalt: 411 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf