As an important part of electric drive, the permanent magnet AC servo system plays a more and more significant role in industry, agriculture, aerospace and other fields. The permanent magnet synchronous motor (PMSM) has been applied in small-medium power drive occasions in wide range for its excellent performance. In order to improve the performance of the PMSM control system, the platform of all-digital PM AC servo control system has been product, all kinds of control methods of PMSM were analyzed in details. The control methods with and without the position sensor under field oriented contro1 has been studied deeply. 1. This paper summarized the development of Permanent Magnet Synchronous Motor (PMSM) servo system, presented the main research problem and created the PMSM servo system. Several main vector control methods were discussed. 2. In the research of digital vector control system of PMSM, double loop control system was chosen, in which a PID controller was adopted in the speed and the current loop. Some problems such as overshoot, long response time and the small range of speed regulating appeared. To deal with these problems, the method of arrange transition course was discussed which arranged a suitable transition course according to the speed step signal and the ability that the system can endure. By means of the theory demonstrating and numerical simulation, a practical discrete linear tracking-differentiator was proposed, which lead the output of system to the transition course. As a result, the range of the proportion gain was extended, the output of system rapidly tracked the step signal and the overshoot decreased. The experiment of PMSM proved the reality and practicability of the proposed method of this paper. 3. A PMSM sensorless control method was proposed based on sliding mode observer. Electromotive force was observed, the rotor position and velocity of PMSM were real-time estimated. Meanwhile, a kind of variable gain sliding mode observer was presented to reduce the chattering roblem of the system. The experiment of PMSM proved the reality and practicability of the proposed method of this paper. 4. From the easy reality of the system, voltage power supply had been selected. High frequency voltage signal injection was easy to achieve because of not changing structure of system. Through comparing with rotary voltage injection method, pulsating voltage injection was adopted to surface mounted PMSM at low speed. The matlab simulation and real motor test proved this strategy. 5. An experimental device had been constructed used Texas Instruments' DSP as core controller. IPM was chosen as power diver circuit. The proposed control strategies had been tested based on this device.
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