Research On Vector Control System Of Electric Excited Synchronous Motor Based On Fluxobserver

With the rapid development of China’s economic, increasing industrialproduction, the power transmission device requirements are also increasing.Synchronous motor drive system based on power electronics technique has beenwidely used in the fields of high voltage and power for its high efficiency, wide speedregulating range and high precision, high stability, fast dynamic response, etc.Existing control systems require a large number of electrical sensors, which affectssystem reliability because of complex system hardware and high failure rate. Inaddition, the change of motor parameters will also affect system performance. Theapplication of mixed flux observer technology is an effective way to improvereliability and efficiency of the drive system. So researching for electrically excitedsynchronous motor vector control system based on air-gap flux estimator is essential.The system can simultaneously realize both energy-saving speed regulation andenvironment protection. For this reason, the research and development of this systemhas significant social effect and economic value. The main contents are as follows:The paper firstly introduces the domestic and international condition ofelectrically excited synchronous motor vector control system based on novel air-gapflux estimator, using the basic thought of vector control mathematical model on it.Secondly, the electrically excited synchronous motor air-gap flux oriented vectorcontrol system is established by analyzing the mathematical model of electricallyexcited synchronous motor. The accurate flux is a valid basis of vector controlsystem.Traditional flux observer for the existence of non-circular flux trajectory andthe motor is not suitable for low speed operation and other issues. A novel hybrid fluxestimator suitable for full speed range was put forward and analyzed in detail. Itpointed out that the estimator was composed of two estimator models, i.e. currentmodel and voltage model, and they switched smoothly.Then vector control system of synchronous motor based on flux observer isdevised. The motor flux is controlled by SVPWM generated by the TMS320F2407and the data observed from the flux observer. Simulation model of vector controlsystem is constructed in MATLAB/SIMULINK. The outcome manifests the way of vector control system of synchronous motor based on flux observer has good controlperformance with practical value.Finally, the full text is summarized, the deficiencies of this system are given, andthe further research work is prospected.