• Document: On the Influence of Stator Slot shape on the Energy Conservation Associated with the Submersible Induction Motors
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American Journal of Applied Sciences 8 (4): 393-399, 2011 ISSN 1546-9239 © 2010 Science Publications On the Influence of Stator Slot shape on the Energy Conservation Associated with the Submersible Induction Motors M. Sundaram and P. Navaneethan Department of Electrical and Electronics Engineering, PSG College of Technology, Avinashi Road, Coimbatore-641 004, Tamilnadu, India Abstract: Problem statement: A good design of Submersible Induction Motor is required to maintain maximum efficiency level. This can be achieved in one way by optimum design of magnetic circuit. The magnetic circuit of an Induction Motor is formed by the combination of Stator core, Rotor core and air gap. In applications like Submersible Motor Pumps, the air gap cannot be minimized beyond 0.5 mm, because of the machining tolerance required, due to large core length. Now a day, the efficiency of such motor is improved by die-cast copper rotor. But the cost of such motor is more and sometimes the rotor core properties are getting changed due to high temperature during die- casting process. Approach: A new stator slot shape is proposed based on the results obtained from the iterations with Rotational Machine Expert (RMxprt) software and the performance is compared with that of the existing stator slot shape, for a 3-phase, 5 hp, 380 V, 2-pole motor The motor with both the stator slot shapes have been analyzed with the Rotational Machine Expert (RMxprt) software. Results: The magnetizing current of new design is 3.25 A, compared to the existing design of 4.67 A. The overall efficiency of the Submersible Induction Motor pump set is 5% more than that of the existing one. The discharge of the pump set has increased by about 80 liters per minute. Conclusion: The proposed stator slot dimension is suitable for more efficiency, less magnetizing current and a good power factor. This design modification does not require much cost and needs no complex manufacturing process. Key words: Submersible induction motor, optimum design, magnetic circuit, rotational machine, magnetizing current, power factor, electrical energy, electric machines, genetic algorithms, stator slot INTRODUCTION trend of optimum design has changed; in fact efficiency and consumed electrical energy appear to be more Submersible Induction Motor with the pump sets important than in the past. are extensively used for agriculture and domestic Many works have concentrated upon this type of purposes, owing to their simplicity, ruggedness and low design ( Mujal-Rosas and Boix-Aragones, 2007, Hakiki cost. In India, during this decade, most of the Khalid et al., 2007 ) A combination of efficiency and Submersible Induction Motors are being manufactured cost objective functions is possible and efficiency-cost with smaller frame size, due to increasing material cost, objective function can partly benefit from the increasing labor cost and to provide economical model. advantages of the efficiency and cost optimum design But, this is at the expense of efficiency, large (Cistelecan et al., 2009). magnetizing current and poor operating power factor. In An attempt has been made to use two optimization order to maximize the efficiency and consequently techniques simultaneously for different aims as minimize the electrical energy consumption of a 3- described in (Frauman et al., 2007), but again for Phase Submersible Induction Motor, many optimization efficiency optimization of the motor. (Subramanian et techniques have been used and suggested in the al., 2010), two optimization techniques (Powell and published literature. The corresponding objective boundary search around active constraints methods) function is generally employed for an economic have been compared. Two other techniques, simplex manufacturing of motors .Such a research effort was and Hooke-Jeeves methods have been compared undertaken before the energy crisis in 1973. Since then, Application of genetic algorithms for the design Corresponding Author: M. Sundaram, Department of Electrical and Electronics Engineering, PSG College of Technology, Avinashi Road, Coimbatore-641 004, Tamilnadu, India 393 Am. J. Applied Sci., 8 (4): 393-399, 2011 optimization of electric machines has been tested in Table 1: Motor specifications Other aspects in the design of Induction Motor have Parameter

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