The Influence of the Tension of the MGU Casing on Its Dynamic Characteristics

The article examined and assessed the parts of traction motor-gear units (referred to as MGUs) and their components within suburban-type electric multiple units (EMUs) subject to vibrational strength analysis. It was found that the bearing shields of the MGUs are the most heavily loaded and worn parts. By measuring the vibration levels of different types of bearing shields, the maximum allowable loads and single impacts were determined. The primary emphasis was placed on investigating the potential impact of the motor's magnetic field on the vibration resilience of the MGUs. Relationships have been identified that enable the analysis of the correlation between the magnetic field waves in the air gap of an asynchronous motor, the radial magnetic force waves impacting the stator, and the bending deformation waves of the stator yoke. These relationships have been applied in multiphysics finite element analysis program to develop a prototype of the MGU. This model, grounded in the provided motor geometry, material characteristics, and the configuration of the current in the stator winding, facilitates the simultaneous exploration of interconnected electromagnetic and mechanical processes across diverse components of the electric machine. Moreover, it considers the rotor's rotation influenced by magnetic forces. The outcomes of the simulation have facilitated the assessment of the radial magnetic force's magnitude impacting the stator, as well as the form and frequency of its deformation waves, crucial for devising active methods to mitigate vibrations.