Performance Analysis of Asymmetrical Rotor Induction Motors
2011 (English)In: Proceedings of Portuguese-Spanish Conferenceon Electrical Engineering, 2011Conference paper (Other academic)
Inter-bar currents can form a considerable part of stray-load losses in a skewed induction motor. A substantial reduction of these losses can be obtained by removal of the rotor skew. Removing the rotor skew will introduce parasitic effects such as increased noise level and increased magnitude of the harmonic torques during motor start. By introducing modulated rotor slots these negative effects can be reduced. In this paper, two different concepts of modulated slot rotors are studied. The starting performance and the losses at rated speed are simulated and compared with a standard motor using the Finite Element Method (FEM). The losses due to inter-bar currents in a skewed rotor are calculated from an analytical model. It is found that the additional losses introduced by the modulated rotor slots are small compared to the possible inter-bar current losses in the skewed rotor. Hence, an increased efficiency can be obtained by introducing modulated non-skewed rotor slots.
Place, publisher, year, edition, pages
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-119611OAI: oai:DiVA.org:kth-119611DiVA: diva2:612095
QC 201303202013-03-202013-03-202013-03-20Bibliographically approved