Research On The Dynamic Performance Of Pm Ac Servo Control System

As the rapid development of material science, microelectronic, control theory, dc servo system has been gradually replaced by ac servo system. And permanent magnet ac servo system gains the mainstream status in ac servo systems because of its adventages. Studying high performance permanent magnet ac servo system is meaningful for narrowing technology gap between domestic and abroad and achieving independent intellectual property.Permanent magnet ac servo system's hardware and software structure is presented in this thesis at first. In the experimental platform, the core motor control is DSP TMS320LF2407; the core of man-machine interface is MCU MSP430F149; the core of power circuit is IPM. The control circuit is builded with digital and analog combining method. The current loop is established with analog devices, the spleed loop and position loop is established by softwares with digital devices. Pleiotropic protection accedes to hardware structure for ensuring the system's safe operation.In the foundation of system's hardware and software structure, the no load dynamic performance is studied. No load dynamic performance of current, speed and position loops is comprehensively analyzed with the method of simulation and experiment. The variable structure PI control is used to improve response speed of speed loop, and the differential negative feedback is imported to avoid overshoot followed. The variable structure P regulator is introduced to improve response speed of position loop. The target is that system has rapid and quasi response and no overshoot.In the foundation of the study of system's no load dynamic performance, system's load dynamic performance is studied by analyzing moment of inertia and load torque. Several kinds'methods of inertia identification in existence are analyzed comprehensively. Improved dichotomy and acceleration deceleration method are introduced to expand applicability of traditional methods. As the moment of inertia has been identified, the load torque is identified to compensate current loop. System's external characteristic becomes more flat and system has better ability of disturbance rejection.