Research And Design Of Permanent Magnet Synchronous Motor Servo System Based On New Dead - Zone Compensation

With the improvement of chip computing power and the wide use of the new power switch tube, the AC servo control system with PMSM as the control object is being used in a large number of applications. And gradually form the leading system of high-end servo products. In particular, the AC servo control system has a unique advantage in the production environment with high precision, high production efficiency, and high quality of products. Contemporary servo control system will be fully digital, more accurate, faster dynamic response and better performance, more convenient to use the trend of development.The permanent magnet synchronous motor (PMSM) as the drive of the control object, explains the the three coordinates in dynamic mathematical model and vector control algorithm theory and principle, and different current control technology advantages. Combined with the space voltage vector pulse width modulation (SVPWM), the servo driver design, model building and system simulation are carried out.This paper focuses on the effect of the dead time effect in the servo system, and analyzes the principle and the influence of the dead time effect of the SVPWM servo system. Since the commonly used average dead time compensation technique is according to the reference voltage of the volt second area and after compensated volt second area is equal as the standard, there are difficult to get the accurate phase current polarity of the problem, leading to will appear error compensation. In this paper, the effect of dead time on the output voltage and current is fundamental, and a kind of low cost and high effective compensation method is proposed.On the basis of theoretical analysis and model simulation, the design of hardware structure and software is realized. The analysis and the design of the hardware in TMS320F2801DSP as the main processing chip, which constitute the three closed-loop AC servo controller, and gives the control circuit, current and speed signal conditioning circuit, drive circuit etc.. Program software development based on the CCS6.0 platform, focusing on the main program, chopped interrupt service functions and other parts.Finally, the test software and algorithm on the servo driver developed on the digital signal processing chip based on TMS320F2801 are developed. The results show that the algorithm is correct, and the system has better static and dynamic performance. The current distortion caused by dead time is reduced, and the effect of zero current clamping phenomenon on the motor operation is eliminated. In the practical application of engineering, the compensation method of the damn area greatly reduces the vibration in the operation of the motor, and increases the rigidity range of the servo system.