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.

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This paper presents a CAD software which uses a methodology to resize the induction motor (IM) winding, by increasing the number of parallel conductors as a means of increasing the efficiency. Such winding resize does not change the shape of the core and slots. Here, parallel conductors with smaller diameters are utilized in the chorded coils. As result, the efficiency and the cost for the resized IM are presented and discussed.

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