Research On Principle Of Feedback Model Inverse Transformation And Vector Control Of Induction Motor

The principle of feedback model inverse transformation is deepened and improved in this paper. Several rotor speed identification methods are designed according to the theory and applied in the asynchronous motor speed sensorless vector control system. In the end the methods are verified by some very simulation and experiments.The feedback model inverse transform principle is a control system design method which is proposed in recent years. Usually getting an inverse model is very difficult in the electrical control systems. And the inverse model is difficult to achieve in engineering. Feedback model inverse transform principle is emerged as the times require proposed for this problem. We can use this principle to get the inverse model of a known model and then to identify the required parameter.Model Reference Adaptive Control System is also frequently used in the actual project. We can get a feedback model inverse transformation system after degrading the structure of the model reference adaptive system. The two systems are the same. Furthermore a design method is presented which is used to design feedback model inverse transformation system through the signal-synthesis adaptation in model reference adaptive system.The induction motor vector control principle and the coordinate transformation are detailed analyzed as well as motor mathematical equations in various coordinate systems. The rotor flux calculation or identification models in different coordinate systems are also derived. In particular, the motor control model in the common used rotor flux oriented vector control is achieved.Several rotor speed observers in induction motor vector control are designed in accordance with the principle of the feedback model inverse transform including speed identification using the rotor flux close-loop control and the torque component of stator current closed-loop control. Simulation by Matlab/Simulink and experimental results show that the feasibility of the feedback model inverse transform principle in designing in the induction motor vector control.