Research On Vector Control Of Speed ​​Sensorless Asynchronous Motor

With the continuous development of microelectronics technology and modern control theory, Vector control has become a mainstream control of induction motor speed control-Traditional vector control system uses a closed loop speed control, But because of the existence of the speed sensor such as rotating coder, This not only increases the cost of the control system, the system also becomes more complex, In addition, Speed sensors are susceptible to the working environment is not conducive to this shortcoming is widely used in industrial control. At the same time in the calculation of flux, As a model for a single voltage or current model, Affect its accuracy vulnerable to changes in rotor resistance, Thereby affecting the accuracy of the resultant vector orientation。This paper describes the advantages and disadvantages of AC speed control technology research status and a plurality of speed sensor technology, Followed by an overview of the induction motor mathematical model, coordinate transformation, the basic theory of vector control。 The key issue for the speed sensorless vector control system: Estimated speed, On the basis of previous research, A novel directional vector control scheme based MRAS speed sensorless rotor field, The program combines the best of MRAS and SVPWM, More advanced control strategies. Then control scheme designed for this article, On Matlab/simulink software platform, Build a simulation model of the new speed sensorless vector control system, With traditional vector control system were compared, New speed sensorless vector control system designed in this paper can not only real-time identification of the motor speed, And has a better dynamic performance also improved harmonic content, Also verify the feasibility and practicability of the design of the new control system。In the case of the simulation speed sensorless vector control system solutions feasibility, The system was to STM32F103R8as the main chip hardware and software to achieve, In this final, Work on this study are summarized, Work on this study were summarized, and the problem still exists for recommendations for improvement。...