In this paper a simple two-axis model for Induction Machines (IMs) with electrical rotor faults is derived. Being of reasonably low differential order, it is suitable for mathematical analysis and can serve as a ground for fault detection and fault tolerant control of the IM. The modelling is performed by applying well established idealizing assumptions regarding the magnetic and electrical properties of the motor. Typical motor faults as broken rotor bars are taken into account. The model is validated against data collected from mass-produced industrial IMs. The validation shows very good agreement between simulations and experiment, for the fault considered. NomenclatureFor both the variables and parameters, a capital letter subscript refers to the corresponding stator axis in a conventional three-axis system. In the same manner, a small letter subscript refers to the corresponding rotor axis. The units for the variables and parameters are SI-units which are omitted for the sake of clarity.Throughout the paper, bold capital letters stand for matrices, whereas small/capital letters denote scalars and vectors. Finally, differentiation with respect to time is denoted by the dot, i.e.ẋ = dx dt .
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