Simulation of an Air Flow in a Clearance of Electric Motor

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Volume Title

Helsinki University of Tehnology | J Muu elektroninen julkaisu

Date

2003

Major/Subject

Mcode

Degree programme

Language

en

Pages

32

Series

Abstract

Abstract: A flow in a clearance of the ABB HXR 400L electric motor is simulated numerically. The clearance is simplified to a two dimensional slot and, therefore, the calculation is not valid in the ends of the rotor. FINFLO flow solver, developed at Helsinki University of Technology, is used in the simulations. For the turbulence modelling k-ω and k-ε models are utilized. The clearance is modelled utilizing symmetry and only a sector of 30 degrees is modelled. The simulations are made with multiple Reynolds numbers. One case is also computed time-accurately in order to see the effect of a quasi-steady assumption. The effect of the slots is studied by calculating a case without slots on rotor and/or stator. Heat transfer is compared with an empirical correlation from literature. Main result: Calculated mean equivalent conductivity for smooth cylinders is near the prediction of the empirical correction. The effect of the slots in studied cases is at the maximum 20 %. The mean equivalent conductivity calculated with the different turbulence models differs up to 40 %.

Description

MEMO No CFD/THERMO-41-2003 Date: 27th March 2003

Keywords

FINFLO, k-ε-model, k-ω-model, electric motor, clearance, air gap

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