Stator current sensor fault detection and isolation for vector controlled induction motor drive

The paper deals with the fault tolerant Direct Field Oriented Control (DFOC) of an induction motor drive. Influence of the stator current sensor faults to the properties of the DFOC drive system is presented. To the current sensor fault detection the simple algorithmic/logical mechanism, based on the measured currents is used. After the fault detection, drive topology is changed. For the calculation of the stator current components (in the stationary reference frame) other algebraic relations based on the signals from the active sensors are used. Drive is tested in simulation and in the laboratory set-up with 1.1kW machine under faulted and post-fault conditions, in wide speed reference changes. All tests were performed on the ds1202 card.