Cascaded sliding-mode control of permanent magnet synchronous motors

In this paper, a cascaded sliding-mode controller for permanent magnet synchronous motors is presented. As it is usual in electrical drive engineering the proposed feedback loop consists of an inner current control loop and an outer velocity control loop. In contrast to conventional realizations with e.g. PI-controllers the current controller is a classical 1-sliding controller, whereas the velocity controller is based on a 2-sliding technique. The resulting control concept is implemented in an industrial power converter. The effectiveness of the approach is demonstrated with the help of real world experiments.