Assessing the influence of one-way magnetic attraction forces on the reliability of the bearing unit of a switched reluctance electric machine

The object of the study is a switched reluctance electric machine with an uneven air gap. The main objective of the research is to assess the influence of the forces of one-way magnetic attraction on the reliability of the bearing unit for different variants of the rotor location. This article takes into account the mutual influence of the forces of one-way magnetic attraction and the imbalance forces. The finite element method was used to calculate the magnetic field. The study examined a switched reluctance machine in which the rotation axis is aligned with the symmetry axis of the stator or offset together with the symmetry axis of the rotor. The values obtained were those of a resulting force of one-way magnetic attraction which substantially exceed permissible values. The study proposes an algorithm for calculating the characteristics of a valve-inductor electric machine, taking into account the tolerances for the manufacture of its structural elements. The algorithm allows for the requirements for the bearings used to be adjusted. This then ensures the required level of reliability of the switched reluctance electric machine, and predicts the level of vibration and noise.