Sliding mode observer for the synchronous machine with permanent magnets

The sensors can be very expensive and their integration very complex in certain industrial processes. The greatnesses not measured estimated by means of observers are going to allow us to reduce the production cost by avoiding us placing sensors. In the linear case the observability is classically determined by a condition of rank and the observers for such systems are generally of type Luenberger, on the other hand in the not linear case, the observability is determined of multiple manners but the classic thought drives to a condition of rank with small arrangements. In the nonlinear case the used observers can be nonlinear sliding mode observers used in our application to estimate the speed and the position of the synchronous machine with permanent magnets.