Open AccessCOMPUTATIONAL ANALYSIS OF THREE DIMENSIONAL STEADY STATE HEAT CONDUCTION IN THE ROTOR OF AN INDUCTION MOTOR BY FINITE ELEMENT METHOD
Author(s) -
A. K. NASKAR,
D. SARKAR
Publication year - 2015
Publication title -
latin american applied research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.123
H-Index - 23
eISSN - 1851-8796
pISSN - 0327-0793
DOI - 10.52292/j.laar.2015.405
Subject(s) - finite element method , induction motor , rotor (electric) , thermal conduction , squirrel cage rotor , mechanics , air gap (plumbing) , steady state (chemistry) , thermal , electric motor , control theory (sociology) , mechanical engineering , materials science , engineering , structural engineering , computer science , physics , thermodynamics , electrical engineering , voltage , chemistry , control (management) , artificial intelligence , composite material
In developing electric motors in general and induction motors in particular temperature limits is a key factor affecting the efficiency of the overall design. Since conventional loading of induction motors is often expensive, the estimation of temperature rise by tools of mathematical modeling becomes increasingly important. Excepting for providing a more accurate representation of the problem, the proposed model can also reduce computing costs. The paper develops a three-dimensional steady state thermal model in polar co-ordinates using finite element formulation and arch shaped elements. A temperature-time method is employed to evaluate the distribution of loss in various parts of the machine. Using these loss distributions as an input for finite element analysis, more accurate temperature distributions can be obtained. The model is applied to predict the temperature rise in the rotor of a squirrel cage 7.5 kW totally enclosed fan-cooled induction motor. The temperature distribution has been determined considering convection from the outer air gap surface and annular end surface for both totally enclosed and semi enclosed structures. Finally the temperatures obtained by this three-dimensional analysis have been compared with the approximate temperatures obtained by two-dimensional analysis.