Modelling of induction machines with skewed rotor slots

Author

Tenhunen, A. ; Arkkio, A.

Author_Institution

Lab. of Electromechanics, Helsinki Univ. of Technol., Espoo, Finland

Volume

148

Issue

1

fYear

2001

fDate

1/1/2001 12:00:00 AM

Firstpage

45

Lastpage

50

Abstract

A model permitting the simulation of induction machines with skewed rotor slot is presented. The two-dimensional finite-element method is used for electromagnetic field analysis of the induction machine. The skew effects are considered by coupling several discs cut by planes perpendicular to the shaft. The solution of the resulting nonlinear time-dependent equation is obtained using step-by-step numerical integration. The paper also presents a method to avoid the singular matrices when rotor bar currents are solved from field and circuit equations. The model is verified by comparing measured and computed results for a 37 kW cage induction motor. Current and voltage waveforms and torque-speed curves are discussed. According to the results the model gives good results when the slip value is under 0.9

Keywords

finite element analysis; integration; machine theory; rotors; slip (asynchronous machines); squirrel cage motors; 37 kW; cage induction motor; current waveforms; electromagnetic field analysis; induction machines modelling; nonlinear time-dependent equation; rotor bar currents; singular matrices avoidance; skewed rotor slots; slip; step-by-step numerical integration; torque-speed curves; two-dimensional finite-element method; voltage waveforms;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:20010036

Filename

902339