An extended flatness-based controller for permanent magnet synchronous machines incorporating an event-based mechanism

Permanent Magnet Synchronous Motors (PMSMs) are widely used in various applications due to their simple structure, small size, high power density, low noise, and efficiency. One method for controlling PMSMs is based on the utilization of the so-called flatness property of the PMSM dynamic equations. In this paper we extend this approach by adding to it an event-based mechanism. A central idea of the proposed approach is that if an event is triggered measurements and estimations of the system states are used to update the controller parameters. This is achieved first by using the flatness property to parameterize the system states and to design a feedforward controller, and second by defining an event generator that maintains an acceptable tracking difference between the actual and desired outputs. The proposed method is tested in three different cases, and is shown to provide accurate tracking and acceptable level of performance.