Technical and Economic Evaluation of Efficiency Improvement after Rewinding in Low-Power Induction Motors: A Brazilian Case

Victor P. B. Aguiar, Ricardo S. T. Pontes and Fernando J. T. E. Ferreira
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Victor P. B. Aguiar: Department of Engineering and Technology, Federal Rural University of Semi-Arid Region, Mossoró 59625-900, Brazil
Ricardo S. T. Pontes: Department of Electrical Engineering, Federal University of Ceará, Fortaleza 60455-900, Brazil
Fernando J. T. E. Ferreira: Department of Electrical and Computer Engineering, University of Coimbra, 3030-290 Coimbra, Portugal

Energies, 2018, vol. 11, issue 7, 1-18

Abstract: Nowadays the economic analysis of an induction motor’s life cycle is the clearest way to measure the viability of actions to promote energy-efficient technologies to the end user. The cost effectiveness in motors replacement by energy-efficient motors is a well-known practice that leads to energy savings, however this paper presents the cost-effectiveness of low-power induction motors which have their efficiency improved after rewinding. This process improves the investment viability and brings the greatest financial and energetic savings. In this paper, low-power induction motors are rewound and their efficiencies are measured by tests A and B from IEEE standard 112/2017. The rewound motors have better cost-effectiveness than replacement by IE3/Premium and even IE4/Super-Premium units. The rewound motors increase between 3 and 4 percentage points in relation to former efficiency and the payback is less than 2 years, regardless of the efficiency measurement method.

Keywords: industrial motors; retrofitting; redesign; stator winding; equivalent circuit; minimum efficiency performance standard (MEPS), cost-effectiveness methods; efficiency measurements; life cycle costs; net savings (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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