A lot of research work has already been done in the case of Three Phase Induction motors. But comparatively, very little work has been done on Submersible motors. Submersible motor manufacturers find it very difficult to design by themselves such motors as very little literature is available on the same. In India, Bureau of Indian standards gives only an overall configuration about such motors. It is not providing any design related data or information. Most of the Indian manufacturers produce such pumps and motors on pure trial and error basis. They make their own winding combination to optimize the performance. The Induction motor design calculations are very lengthy involving huge number of variables. These results do not work properly in case of Submersible motors. There is a need to modify some steps and make some necessary adjustment which is also not an easy task. This paper presents a practical and working procedure to optimize the Core length of a water cooled three phase submersible motor which can be easily applicable to rapidly design such motors from 1.0 hp to 50 hp. If such motors are designed with optimized Core lengths then this will be the competitive edge for the manufacturer. A smaller size motor capable to deliver better torque will save cost considerably. This paper also examines some of the leading manufacturers existing designs and compares with this new one. The calculations presented in this paper are based on available market stampings and do not include its design. The designs are verified and validated by a reputed manufacturer and will give its recommendation.
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