Title: Computation of thermal condition in an induction motor during plugging

Authors: D. Sarkar; A.K. Naskar

Addresses: Department of Electrical Engineering, Bengal Engineering & Science University, Shibpur, Howrah-711302, India ' Department of Electrical Engineering, Seacom Engineering College, Howrah-711302, India

Abstract: The problem of two-dimensional heat flow in the stator of induction motor is solved by use of a finite element formulation and arch-shaped elements in the r-θ plane of the cylindrical coordinate system. The shape functions and exact solution matrices are derived algebraically for utmost economy in computation. The temperature distribution has been determined considering convection from the stator frame and cylindrical air-gap surface. The model is applied to one squirrel cage totally enclosed fan cooled (TEFC) machine of 7.5 kW. Finally, the temperatures obtained by this two-dimensional approximation have been compared for different stator currents for a period of 10 seconds at time intervals of 1 sec during the transient in plugging method of braking.

Keywords: finite element method; FEM; induction motors; plugging; thermal analysis; transients; design performance; 2D heat flow; stator currents; braking.

DOI: 10.1504/IJPEC.2014.061763

International Journal of Power and Energy Conversion, 2014 Vol.5 No.2, pp.172 - 196

Received: 14 Jun 2011
Accepted: 02 Sep 2012
Published online: 05 Jul 2014 *

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