Abstract
This article describes a procedure of overhauling an induction motor while making it more energy efficient, as well as a calculation method for estimating the costs incurred for such overhaul. The article describes both a conventional overhaul procedure and a repair procedure that also involves enhancing the motor energy efficiency. Mathematical formulas are given for calculating the labour and material costs necessary for repair and optimization of induction motors. The authors conducted a feasibility study demonstrating the cost-effectiveness of overhauling an induction motor while at the same time increasing its energy efficiency. The article relies on an algorithm and a computer program designed for labour and material costs estimation with regard to the conventional overhaul procedure and the one involving efficiency enhancement. It is shown that the latter can increase the efficiency factor and reduce the active power loss by 3-7% in the electric drive and the power supply system. Simulation data and the actual practice show that the additional optimization costs amount to 23-30% of the conventional overhaul costs. However, such additional upgrade costs can be justified within 0.25 to 0.8 years due to power savings. The results of this R&D project can be recommended for review by electrical departments of the running plants, electrical repair shops and energy efficiency centres.
Keywords
Induction motor, procedure, repair, upgrade, operations, labour, materials, modeling, algorithm, computer program, energy efficiency, cost-effectiveness, payback period.
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