Air-Gap Flux Oriented Vector Control Based on Reduced-Order Flux Observer for EESM

Electrically excited synchronous motor (EESM) has the characteristics of high order, nonlinear and strong coupling, so it is difficult to be controlled. However, advantages adjustable power factor, efficiency, precision torque control, widely used in high-power applications. The accuracy a flux observer influences speed control system EESM. Based on state modern theory electrical excitation machine equation, reduced-order designed. Using first-order difference method forward bilinear transformation method, discrete, stability analyzed. analysis shows that using better than first order method. In operation, parameters will affected by factors temperature, magnetic saturation, frequency. this paper, influence parameter variation studied pole distribution. Finally, regulation simulated, which verifies observation.