This paper deals with the choice of motor and transmission in mechatronic applications by means of an approach in which all the following aspects related to the transmission are taken into account from the outset: the limits of speed and torque of the transmission; the alternation in the reference task of direct and inverse efficiency of the transmission, which can also be functions of the motor speed; the transmission inertia. In this paper only the continuous duty operating range of the drive system is considered. The method is based on the determination of the motors that can be coupled with a given transmission and is explained by means of resolving diagrams. The guidelines of an automatized procedure for the determination of the admiss...