Modeling and Simulation of Electromechanical Coupling Dynamics for Permanent Magnet Synchronous AC Servomotor

Based on the established electrical and mechanical energy equations consisting of servomotor parameters,Lagrange-Maxwell equations of three-phase stator reference coordinates were transformed to the equations of two-phase rotor reference coordinates by Park transform.Electromechanical coupling dynamics equations of permanent magnet synchronous servomotor in two-phase reference coordinates were obtained.In this dynamical modeling method of electromechanical coupling system,the dynamical differential equations can be established by only measuring amplitude of the flux induced by the permanent magnets and the winding inductance in dq0 reference of the motor,the size of magnetic circuit needs not to be measured.The method is terse,efficient,and is easy to be used.Electromechanical coupling dynamics system of servomotor was simulated.Simulation results show that the deduced electromechanical coupling dynamics equations for servomotor are correct,and current control schemes are reasonable.