The Embedded Research Of Weak Magnetic Speed Contrcl System Based On Permanent Magnet Synchronous

With the development of science and technology, research and application of AC drive system has been rapid development. The high-performance permanent magnet synchronous servo system has been developing rapidly. The higher performance requirements, which requires a large torque at low speed.It is desirable to obtain a wider speed range,and run smoothly in a wide speed range. So weakening control of permanent magnet synchronous speed control system has become a hot topic.The weakening control in permanent magnet synchronous motor speed control system based on the increasing demands. Regard as a key research,Weakening control methods becomes the study of some domestic experts and scholars, which made a good results. The mothod is also been verified in the industrial field.With a small, high power density, higher efficiency and power factor obvious advantages, the permanent magnet synchronous motor (PMSM)has a high value in electric vehicle drive systems, and scholars in this area has made a lot of results. Meanwhile, with the development of power electronic devices and high-speed micro-controller, control theory and practical application of permanent magnet synchronous motor constantly improve and enhance, permanent magnet synchronous motor drive system will have a wider range of applications.Meanwhile, with the development of power electronic devices and high-speed micro-controller, control theory and practical application of permanent magnet synchronous motor constantly improve and enhance, permanent magnet synchronous motor drive system will have a wider range of applications. First, the text on the status of the development of domestic and foreign weakening control of permanent magnet synchronous motor and the future trends for a simple introduction, and vector control are also simple explanation of the various coordinate transformation vector control for a simple derivation, and according to different coordinate systems to write a mathematical model of permanent magnet synchronous motor in different coordinate systems, in addition to the space vector PWM voltage vector control technology and several current control strategy for a simple introduction.And this paper from the permanent magnet synchronous motor structure and control the angle of the rotor itself two baking detailed analysis of the reasons for the weak magnetic influence of the permanent magnet synchronous motors, but also through the formula deduced rotor flux and cross, straight influence of these parameters on the axis inductance weakening, and draw out their relationship diagram by diagram on the impact of a weak magnetic motor parameters made a steady-state analysis shows. Secondly, the principle of weakening control algorithm carried out a detailed analysis of the direct current weakening control and the torque angle strategy paper adopted a detailed description, and their control principle of a simple analysis, including the maximum torque current base rate less than that used above base speed control and the use of weakening control, through the derivation of the formula were established permanent magnet synchronous motor control block diagram weakening speed control system based on direct current and turn-based weak magnetic moments of permanent magnet synchronous motor speed control block diagram of the angle of the system, then these two systems are briefly introduced, and finally these two control systems using MATLAB simulation software to build a model of the system software, by the end of the simulation results and waveforms output analysis and comparison of their results.Finally, this paper discusses hardware-based system of the torque angle weakening control system. The motor driver is controlled by DSP.The results prove the correctness and feasibility of the proposed control strategy which achieves a good speed range extended by weakening.