Abstract
For the development of electric machines, particularly induction machines, temperature limit is a key factor affecting the efficiency of the overall design during transient state. Since conventional loading of induction motors is often expensive, the estimation of temperature rise by tools of mathematical modeling becomes increasingly important and as a result of which computational methods are widely used for estimation of temperature rise in electrical machines. This paper describes the problem of two dimensional transient state heat flow in the stator of induction motor during auto-transformer starting. The stator being static is prone to high temperature and the study of thermal behavior in the stator is useful to identify the causes of failure in induction machines. The temperature distribution is obtained using finite element formulation and employing arch shaped elements in the r-θ plane of the cylindrical co-ordinate system. This model is applied to one 3-phase squirrel cage induction motor of 7.5 kW rating.
Highlights
Considering the extended use of squirrel cage induction machine in industrial or domestic applications both as motor and generator, the improvement of the energy efficiency of this electromechanical energy converter represents a continuous challenge for the design engineers
Rajagopal et al [14, 15] carried out two-dimensional steady state and transient thermal analysis of TEFC machines using FEM
The finite element method is first introduced for the steady state thermal analysis of the stator cores of large turbine-generators by Armor and Chari [16]
Summary
Considering the extended use of squirrel cage induction machine in industrial or domestic applications both as motor and generator, the improvement of the energy efficiency of this electromechanical energy converter represents a continuous challenge for the design engineers. The finite element method is first introduced for the steady state thermal analysis of the stator cores of large turbine-generators by Armor and Chari [16]. Their works are restricted to core packages far from the ends and they do not consider the influence of the stator coil heat. Approximate Analysis of Transient Heat Conduction in the Stator of an Induction Motor during Auto-transformer Starting at mid-slot, mid-tooth divided into 24 arch shaped elements and provides a new approach of multi-time interval solution to a transient stator heating problem and this defines the scope of this technique. The procedure is suited to the study of transient heating of the stator coils due to I2R losses in the coil slots during auto-transformer starting
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