Measurement proven analytical and numerical models for calculation of the teeth flux pulsations and harmonic torques of skewed squirrel cage induction machines

Author

Knopik, T. ; Binder, A.

Author_Institution

Inst. for Electr. Energy Conversion, Darmstadt Univ. of Technol., Darmstadt, Germany

fYear

2011

fDate

17-22 Sept. 2011

Firstpage

162

Lastpage

169

Abstract

An analytical approach to calculate the tooth flux pulsations of stator and rotor teeth in squirrel cage induction machines at sinusoidal voltage supply [1] is compared with FEM (Finite Element Method) results. The analytical approach allows the fast calculation of the losses due to the tooth flux pulsations in the stator and rotor at any given slip, load and saturation level. In addition, the analytical calculation of the torque curve during start up is discussed considering the harmonic torques and the effect of inter-bar currents in skewed rotor cages. Calculations and measurements are compared for 4-pole TEFC (Totally Enclosed Fan Cooled) standard induction motors with nominal power levels of P_N = 0.75kW, 2.2kW and 9.2 kW.

Keywords

asynchronous machines; cooling; finite element analysis; machine theory; magnetic flux; rotors; squirrel cage motors; stators; torque; finite element method; harmonic torques; interbar currents; power 0.75 kW; power 2.2 kW; power 9.2 kW; rotor teeth; sinusoidal voltage supply; skewed squirrel cage induction machines; stator teeth; teeth flux pulsation; torque curve; totally enclosed fan cooled standard induction motors; Coils; Harmonic analysis; Iron; Loss measurement; Rotors; Stator windings;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2011 IEEE

Conference_Location

Phoenix, AZ

Print_ISBN

978-1-4577-0542-7

Type

conf

DOI

10.1109/ECCE.2011.6063764

Filename

6063764