AC Servo Control System Design Based On DSP

As the development of science and technology, AC servo system has been applied more and more. Especially with the appearance of special DSP facing of motor control, which solves the problem that SCM can't solve before , makes it possible of modularization and digitization of motor control system. Vector control makes AC asynchronous motor equivalent of DC machine, and makes stator current in three-phase coordinates change into AC current in two phase static coordinates by 3/2 transformation. Then AC current in two phase static coordinates will turn into DC current in the synchronous revolution coordinate system by directed rotation transformation. DC current is equivalent to the exciting current and armature current in the DC machine, it will control two components of the speed and the magnetic field independently through imitating the control of the DC machine. The system has wide extent in speed regulation and can carry out accurate control in torque. The dynamic response of the system is very fast and the control performance is excellent.The paper take TMS320F2812 as core controller to design an excellent AC motor control system which mainly introduce the construction of the peripheral circuit and the selection of electronic device in TMS320F2812. The system includes the parts of double closed loop rectifier filter, dynamic braking, the detection circuit of electric current, the temperature detection circuit, the over-current detection circuit, photo electricity coding detection circuit and fault detection circuit of DSP. And it has introduced internal clock interrupt module, communication module and AD sampling module based on the hardware in the TMS320F2812,finally do simulation by MATLAB. According to the experimental result, the system will optimize parameters and the hardware structure ,which can realize accurate control in AC motor servo system.