A sensor fault tolerant drive for interior permanent-magnet synchronous motors

The study reported in this paper deals with the problem of developing a controller with tolerance to current sensor faults. To achieve this goal, two control strategies are considered. In the first method, field oriented control and a developed observer are used in case of no fault. The second approach is concerned with fault tolerant strategy based on an observer for faulty conditions. Current sensors failures are detected and the current will be estimated successfully in order to allow continuous operation of the vector control. Based on the motor model, currents can be estimated using a nonlinear observer. A decoupling current vector control strategy is developed to ensure high performance operation by incorporating the maximum power factor per ampere operation. The simulation of the proposed scheme applied to the interior permanent magnet synchronous motor has been implemented in the Matlab environment. Simulation results illustrate the applicability of the proposed approach.