Software Study On AC Servo System For NC Lathe

AC servo system is the core of numerical control lathe. It has great impact on the processing precision and efficiency of parts. Most AC servo system needed by high performance numerical control mation tool are imported from abroad. This actuality restricts the development of numerical control machine tool industry. Along with the fast development of power electronics, micro-computers, rare earth permanent magnet materials and control theory, permanent magnet synchronous motor (PMSM) has been widely applied in motion control system of medium or low capacity, PMSM has become the developing direction of servo drive in servo drive field.In this thesis, AC servo system of permanent magnet synchronous motor is designed to be suited to lathe. We applied FOC theory to realize uncouple of controls parameter of PMSM and linearization control, and applied SVPWM technology to increase voltage using rate. Whole system has the virtue of simple control and good performance.In this thesis, the TMS320LF2407 DSP is applied. The high-speed digital signal processing (DSP) completes the complicated algorithm of control, and suits the velocity modulation system that creates the high performance. And the core has abundant resources. So hardware circuit and software is simplified.In this thesis, based on a digital signal processor TMS320LF2407, a controller for PMSM the AC servo system of FOC system of PMSM has been set up by using FOC theory and SVPWM technology. In order to increase dynamic characteristic and static characteristic, we designed the PI speed controller and PI current controller.To simplify circuit and improve reliability of the system, IPM is applied as power parts in this thesis. The hardware system is composed of the power circuit, protecting circuit, control circuit, sampling circuit. The power circuit includes rectification, filtering circuit, inversion (IPM), drive of the IPM. The protecting circuit includes the over voltage and under voltage protection, current limiting protection, wrong protection of IPM, over current protection, etc. The control circuit includes the simplest system, the SCI, SPI circuit, the debug input circuit, PWM pulse produced...