A guide for the ranking and selection of induction motors

This paper, introduced an expression of Economic Efficiency Measure (EEM) to permit quick evaluation for replacement of faulty induction motor with alternative (new or refurbished motor) for lowest life-cycle cost based on efficiency and rated-load conditions. This approach, simplifies the process for evaluating the energy efficiency to mere proportionate factor called as EEM. During the operating phase, the motor losses correspond to extra energy consumption, based on various parameters like motor operating conditions, operating hours, operating costs, fault factor, depreciation factor and fixed costs. The approach is effective in addressing the global issue on replacement of the faulty motor that needs a comprehensive analysis and mathematical expression. Compared to other alternatives the EEM provides a simple but effective and reliable means to asses, the feasibility of replacing or refurbishing the faulty motor. A detail analysis here would establish how much the present approach is effective in determining the replacement for a faulty induction motor either by a new one or refurbished one of corresponding rating. 1. INTRODUCTION The induction motor is the main driven system in industries, which consumes 30-60 percent of total electrical energy. Energy is utmost need in every field to perform activities whether it is residential, commercial, industrial, agricultural and host of alike applications. The need for energy conservation is vital but the best practice principle while selecting induction motor begins with analyzing the life cycle cost of the motor. Life cycle cost is a financial principle for selection of motors as they consume more than half the energy used by the plant [1]. In general, 65 percent of the total load is industrial load in India and 90 percent of this industrial load is induction motor load. It is a well known fact that induction motor operating at full load offers good efficiency, even at relatively modest kW-rating. However, at lower values than rated loads, which is common condition that many motor experience for significant portion of their service, their efficiencies decreases and increases losses so energy consumption is more in industry [2]. The efficiency of a motor is determined by intrinsic losses (fixed losses and variable loss) that can be reduced only by changing the design of the motor. It is evident that optimizing efficiency of induction motors would significantly address this issue but major task lays mostly in its difficult controllability, due to its complex mathematical model, its non linear behavior during saturation effect and the electrical parameter oscillation which depends on the physical influence of the temperature. When induction motors are operated without a proper control (drive), the motors are consuming large energy and the operating costs are high. These physical and operational disturbances often cause failure of the motor, often replacement of the motor is considered as a viable solution but often to reinstall a failed motor after refurbishing could be economically feasible. The most common cause of

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