Characteristic conceptual solutions of connection of electric motor and gear unit, in the frame of universal motor gear reducer with helical gears, are analyzed in this paper. The aim of this analysis is to highlight the importance and benefits of particular solutions. It is known that today almost all major manufacturers of universal motor gear reducer use special (reducer) motors. Smaller manufacturers commonly use standard (IEC) motors, although large manufacturers, sometimes, also use IEC

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... tors, especially when the customer request. The both of electric motors have certain advantages which manufacturers of motor reducer, with suitable construction solutions, want to use in order to achieve some benefits in the market.