Research On Induction Motor Control System Based On Measurement Feedback Optimization Of Encoder

With the development of AC servo system,its performance continues to improve,mainly reflected in the control of torque and speed,and the cost performance continues to improve.The AC servo drive system of the asynchronous motor applied in this topic is designed for the hydraulic lifting module of the high-altitude engineering vehicle,which has the advantages of "high control precision,low pressure and high power,fast response".This paper starts with the speed feedback of the servo system and improves the measurement result feedback of the encoder,aiming at improving the accuracy and real-time performance of the speed feedback.Firstly,the solid model of induction motor and magneto electric encoder in AC servo system was established,and the magnetic field and thermal field of the solid model were simulated and analyzed by ANSYS and Maxwell software,which verified the feasibility of the parameters and structure design of motor and encoder.At the same time,the mathematical model of vector control of induction motor is established in three coordinate systems.Secondly,the improvement technology of encoder measurement feedback is described from the aspect of encoder measurement accuracy.Among them,the accuracy of the magnetic encoder as the research object,a multi-pole magnetic encoder Angle subdivision method based on the pole number to calculate the remainder,and the use of photoelectric encoder error compensation,can effectively improve the resolution of the magnetic encoder and measurement accuracy.Then,the model of vector control algorithm including current and velocity double loop is constructed.In order to ensure that the measurement velocity feedback of the photoelectric encoder has a better tracking of the velocity instruction,a velocity feedback observation algorithm with parameters is proposed based on the vector control system.The proposed method can effectively reduce the velocity feedback delay.Finally,according to the asynchronous motor control model analyzed above,the experimental platform including hardware and software is built w ith Renesas RX63 T series single chip microcomputer as the core.The reliability of the experimental platform is verified by dead zone time test and temperature rise test.On this basis,the improved encoder feedback algorithm is verified.