| Abstract |
A new second order dynamic model of a self-controlled synchronous motor drive is proposed, taking into consideration the commutation effect for a salient pole synchronous motor with two unsymmetrical damper windings and is excited from a constant field voltage. Based on the small signal linearization around the steady state operating point, the mechanical and electrical transient response functions to disturbances of the power source voltage, triggering angle, excitation level or Load Torque have been directly obtained. Moreover, the model can be easily transformed to represent a non-salient pole machine with or without damper windings excited by a constant field current or by a constant field voltage. Therefore the effect of the damper windings as well as the effect of the fluctuation in the field current on the dynamic behavior could be rapidly analyzed comparing the position of the main poles in the S-plane. The transient responses obtained using this simplified model are confirmed by a digital simulation program which virtually approves the validity and the accuracy of the proposed model. |
