ABSTRACT
This chapter presents a deadbeat controller and a predictive form of current controller that give very high and dynamic responses. The design of current and speed controllers is usually based on linear control system techniques such as the Bode plot or the root locus or by using standard optimum functions such as the symmetric optimum. The performance of the speed control loop is highly dependent on the inner current control loop and therefore the highest priority must be placed on the current controller design. The design of the speed controller becomes tedious if the system’s onlinearity is considered. Simplification leads to a linear system and it is used in the synthesis of the speed controller. The design of the current controller for permanent magnet synchronous machine drives becomes crucial in high-performance applications. In the presence of the d-axis stator current, the d- and q-current channels are cross-coupled and the model is nonlinear due to the torque term.
