This work focuses on a development of an accurate Finite Element Method (FEM) model to predict the Reed Critical Frequency (RCF) of an electric motor and a study of the influence of the fixation base on the deviations from the numerical to the experimental results. Ideally, the base for experimental tests needs to be sized in a way to avoid any deflection or displacement in the attachment position of the motor. In order to evaluate the FEM model and the influence of the base characteristics in the RCF results, three testing bases were used to test the same electric motor. The relation of the masses of the bases to the mass of the motor are nearly eight times, twenty seven times and ninety eight times, respectively.