Vector fault tolerant control of induction motor drives subject to stator interturn faults

The paper describes a vector fault tolerant control of squirrel cage induction machines (IM). The field oriented control (FOC) was combined to robust sliding mode control (SMC). This last is a technique to adjust feedback by previously defining a surface. The controlled state variables will be forced to move on this surface, then the behavior of the machine slides to the desired equilibrium point. We have taken the stator interturn fault, which is the most frequently encountered in practice. An analytical method for the modelling of this fault has been presented including space harmonics effect. This method is based on the calculation of the magnetic field distribution through the machine air-gap. The obtained model is less complicated to be implemented for condition monitoring or to validate fault tolerant control algorithms. Simulation results show, on the one hand that the proposed control scheme provides highperformance dynamic characteristics, and on the other hand the applicability and the tolerance of this control.