The “continuous duty power rate” of a brushless motor is a coefficient that characterizes its ability to accelerate a load. For this reason it is also called “accelerating factor” and playes a considerable role in the choice of the motor to be used in an automatic machine. This work is focused on the analysis of this parameter, defined for each motor as the ratio between the square of the motor nominal torque and its momentum of inertia: it is exclusively defined by parameters related to the motor and, therefore, it does not depend on the machine task. The research is carried out through a database containing the main electromechanical features of some commercial motors and their “accelerating factors”. Using the collected information, related to more than 300 brushless motors, some graphs are produced showing how motors having the same size can have different accelerating factors or, conversely, how same accelerating factors can be obtained through different electro-mechanical design.

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