“…The circumventing of these nonlinearities is usually realized by a well known method, the system equations linearization around an operating point and linear controller design [3]. Recent advances in nonlinear control systems and development of the intensive real time control using DSP have allowed new approaches regarding to DC weakening field drive [1], [2], [4], [5], [6], [9]. Such a control is required for high dynamic performances in the closed-loop design of DC motor drives applicable to motion control.…”