ABOUT THE INFLUENCE OF THE FREQUENCY REGULATED ELECTRIC DRIVEON BENDING VIBRATIONS OF THE MINE FAN ROTOR
Issues related to the flexural oscillations of the rotor shafts of an axial single-stage fan of the main airing made according to a typical kinematic scheme, which are caused by electromagnetic phenomena in the engine, are considered. The analysis of constructive-mass characteristics of serial axial single-stage fans rotors is given. The lower limits of the range of natural frequencies of the fan shaft flexural vibrations are determined, depending on the diameter of the impeller. The frequencies of the own flexural vibrations of the fan transmission shafts are determined. It is shown that for certain diameters of impellers it is possible to hit working rotational speeds of the rotor in the zone of critical operating conditions caused by oscillations of forces of electromagnetic nature with twice the frequency of the supply voltage.