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The problem of electric drive design concerns the multi-criteria and non-linear problems having a number of more or less right solutions. In daily practice the search of optimum solution bases a great deal on the designer intuition and experience. Therefore, multiple obtained results have a waste degree of equipment use, unwarranted complexity, or excessive cost. Proposed approach is based on the implementation of the Structured Query Language (SQL) into the design and modelling stages concerned the work with databases of the drive components. Examples of effective algorithms are given to choose an optimum ratio of electrical and mechanical components. The soft tool is developed to generate and edit SQL sentences, to extract information from databases, as well as to test different component sets for particular applications.