Influence of the reducer efficiencies on the choice of motor and transmission: Torque peak of the motor

• Alternation of the power direction through the transmission during the reference task.
• Division of the load torque into two distinct functions of time.
• Equation of the generalized torque peak curve.
• Graphical method to verify each transmission for given motor.
• Automatized procedure to find all admissible motors and related reducers.

This paper deals with the choice of motor and transmission with reference to the dynamic operating range of the motor and to the general case in which there is alternation of the power direction through the reducer. The paper proposes a method in which the resolving diagrams are obtained starting from the distinction between two different load torques, characterized by only direct and only inverse efficiency of the transmission respectively. In order to make the correct choice of the reducer to be coupled with a given motor, the paper also proposes a diagram that relates the transmission ratio and both the efficiencies. The guidelines for an automatized identification of all the admissible drive system-transmission couples are delineated and an industrial case study is discussed.