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ABSTRACT

Temperature rise is a major worry in the short and long term operations of induction machines, which are the most useful industrial work symbols. The mean temperatures at the various core sections of an induction machine are investigated in this study. The thermal network of the system is created, and the algebraic and differential equations for the proposed models are solved to determine the machine’s thermal performance under steady and transient conditions. The temperature rise in an induction machine is estimated using the lumped parameter thermal method. Thermal resistances, thermal capacitances, and power losses are used to achieve this strategy. The 7.5kW machine is separated geometrically into a number of lumped components to examine the thermal process, each component having bulk thermal storage, heat generation, and linkages. Dimensional data, thermal properties of the materials used in the design, and constant heat transfer coefficients are used to create the lumped parameters. The steady-state thermal circuit consists of thermal resistances and heat sources connected between the component nodes, whereas the thermal capacitances were utilized in addition for transient analysis to account for the change in internal energy of the body over time. Response curves illustrating the projected temperature rise for the induction machine core parts were generated during the simulation using MATLAB. The influence of the decretization level on symmetry was investigated using two different thermal models, the SIM and the LIM, which include eleven and thirteen nodes, respectively.

CHAPTER ONE
INTRODUCTION
Background of Study
The thermal modeling of the induction machine is the subject of this thesis. With the growing demand for miniaturization, energy conservation and efficiency, cost reduction, and the need to take advantage of simpler and more readily available topologies and materials, it’s becoming necessary to examine the induction machine’s thermal circuit in the same light as its electromagnetic design. This would aid in the early detection of thermo-electrical faults in induction machines, resulting in a task that is thoroughly investigated and pays off in cost and maintenance savings. Because induction machine failures are caused by the machine’s aging or by harsh working conditions, monitoring the machine’s thermal status is critical in order to discover any issue early and avoid catastrophic machine failure. Thermal faults, electrical faults, and mechanical problems are the three types of induction machine faults. Recent advancements in the design and fabrication of stator windings have helped to reduce stator electrical failures. Machines driven by switching power converters, on the other hand, are stressed by voltages with high harmonic content. For electric drives, the latter choice is becoming the norm. The development of considerably enhanced thermal system cum insulating material is one approach. On the other hand, cage rotor design is undergoing minor changes, and rotor bars can be broken due to thermal stress, electromagnetic forces, electromagnetic noise and vibration, centrifugal forces, and environmental stress.

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