Bearing faults and eccentricity faults are significant contributors to induction motor performance degradation and failures. This article presents a multiphysics model for induction motors, integrating both the electromagnetic and mechanical systems to effectively characterise their behaviour in the presence of bearing faults and eccentricity faults. The proposed model incorporates the interactions between the two systems through the unbalanced magnetic pull, the electromagnetic torque, and the rotor motion. Bearing faults are represented as physical spalls with specific width and depth located on the bearing components. Eccentricity faults, on the other hand, are modelled as a non-uniformed distribution of air gap. Both the bearing fault models and the eccentricity fault models are integrated into the mechanical part of the multiphysics model. The model is validated by the comparison with the reference data from the motor manufacturer and the finite element method. Results show the proposed model achieves remarkable accuracy with moderate computational cost. The effects of fault severity, fault location, load torque, and external load on the unbalanced magnetic pull produced in induction motors and the rotor radial displacement are studied.

In this paper, the effectiveness of applying an extra time delay to the data transmitted over redundant channels to cope with harsh electromagnetic interference is studied. The redundant system is compared with and without extra time delay and compared with a non-redundant system, which is the reference situation. The geometries under study are disturbed by strong incident fields, which represent reverberation room conditions. These conditions refer to the planewave integral representation, where multiple planewaves with random angles, polarisations and phases are combined and normalised, to create a reverberation room like environment. A reciprocity based technique is used to efficiently calculate the induced voltages and the resulting bit error rate for the different situations. Because of the properties of the geometries that are under test and the introduction of a time-delay in the transmitted datastream, the moment the induced voltage due to EMI is sampled is different, which causes an EMI-diverse system. The results show that using time-diverse signals optimized for the main disturbance frequency to be expected, is a very effective way of creating EMI-diverse behaviour. In a majority voting (2oo3) system it is possible to eliminate all triple occuring faults. Even for higher field strengths and different EMI frequencies, the time diversity method performs well (better than other EMI-diverse techniques).

Modern hi-tech systems rely heavily on communication networks while operating in increasingly harsher electromagnetic conditions. To protect transmitted data from corruption, Error Correcting Codes are widely used. In this paper, the effectiveness of the Hamming code is evaluated under harsh electromagnetic disturbances. Our simulations show that, under certain conditions, the impact of the introduced overhead cannot be compensated by the single error correcting capabilities of the Hamming codes. Moreover, for specific bit and disturbance frequencies and for larger data sets, the use of a Hamming code provides limited to no advantage.