Analytical Design of Flux-Weakening Voltage Regulation Loop in IPMSM Drives

Analytical design and adaptation of voltage regulation loop for flux-weakening control of Interior Permanent Magnet Synchronous Motor drives are addressed in this paper. Theoretical analysis of the overall dynamics of the loop has been carried out in recent papers, also taking into account non-linear effects and discrete-time implementation issues. A proper gain adaptation technique was proposed to provide a local linearization, aiming at maximization of the dynamical performance and maintain stability of the loop. Unfortunately no closed-form design method was provided due to the complexity of the transfer function and only graphical analysis of the loop function was shown. In this paper a novel simplified analysis is proposed, which allows analytical design of the regulator gains after the application of a real-time compensation of any non-linearity. Simulations validate the approach, and experimental tests show the feasibility of the technique on a standard drive hardware, leveraging its ease of implementation.