Computer aided thought process for robust PMSM control

Permanent magnet synchronous machines are commonly used with a pulse width modulated inverters to obtain easy to use variable speed actuators. Such drive systems may be applied to different types of mechanical loads. The inverter must feed the machine with a sinusoidal current controlled in magnitude and phase to obtain a brushless behavior. Robust speed control techniques must be implemented when the mechanical load is uncertain or to maintain the performance whenever the load changes. This paper points out that internal torque/current control must be effective before tuning a speed controller. Thought process is explained step by step and is computer aided. The design of the different control loops are made in simulation with optimization approach or robust formulation. Due to DSP development the implementation on the actual device is described and controllers are tested easily.