Research On High Precision AC Servo System Based On FPGA

Under the development of motor technology, modern power electronics, microelectronics technology, control technology and computer technology, AC servo drive technology has promoted great progress. As permanent magnet synchronous motor has the merits of low electromagnetic torque ripple coefficient, stable operation, rapid the dynamic response, high reliability, permanent magnet synchronous motor servo system has gradually become the mainstream of AC servo system in the high-precision, high-performance servo drive field.This paper introduced the conception, composition, development and application of the servo system, as well as the basic requirements of it. Then it derived a mathematical model of PMSM to analyze its time and space vector map. The magnetic field oriented vector control methods are promoted here in accordance with the actual situation.Then the paper supplied a detailed analysis of the single power supply amplified circuit, provided the method of the wiring and circuit design of linear amplifier, compared with the dual power supply amplification circuit, gave the waveform of the simulation and experimental results.In Chapter 4, a method of the formation of velocity curve was given. The methods of initial rotor position detection for PMSM using incremental encoder are discussed. Three basic algorithm of measuring speed is given, and Advantages and disadvantages of methods were indicated.Chapter 5 introduced the characteristic of structure of Cyclone series EP1C12Q240C8 FPGA. And it has provided a detailed description of the hardware design based on the actual system.Chapter 6 introduced the FPGA development process, described a detailed design method and idea of each module and proposed a four-frequency circuit designing method based on FPGA. Quartus II was utilized to simulate the timing of each module. And the simulation waveform was shown here.Finally, an experiment was carried out by PMSM, the voltage and current waveforms were recorded and analyzed. We also used the SignalTap II in Quartus II to measure the velocity waveform directly.