The Design Of Full Digital AC Synchronous Servo System Based On Resolver Transformer

The full digital AC-synchronous servo system based on resolver transformer as position feedback device is deeply and roundly studied in this thesis, Its main content is as follows:Firstly, notions, characteristics, and general development situation abroad and in home of AC-synchronous servo system are introduced. Secondly, the mathematic model of permanent magnet synchronous motor (PMSM) is established and the structure and the operation principle of AC-synchronous servo system are deduced. Then using vector conversion, decoupling and linearizing the mathematic model of AC-synchronous servo system are carried out. With MATLAB\SIMULINK tools, the simulation model of AC-synchronous servo system is set up. Back EMF's influence on current loop is analyzed when mechanical time constant of target motor is less than electrical time constant of it. It is proved that current regulator can be designed by engineering design method under this condition. Thirdly, according to the rotor magnet field oriented control strategy, current regulator and speed regulator of AC-synchronous servo system are analyzed and designed. Fourthly, the hardware system of full digital AC-synchronous servo system is designed and the principle, the application and anti-disturbing measures of resolver transformer are introduced in detail. Finally, resolver transformer's excitement signal waves before and after anti-disturbing and speed and torque current's transient response waves are introduced. Comparing simulation waves with experiment waves, we can come to a conclusion that the simulation model of AC-synchronous server system in the thesis is important to direct practical system design .The feedback channel based on resolver transformer and the corresponding anti-disturbing measures are right and feasible. the design of current regulator and speed regulator and the hardware design of whole servo system are right and in reason .