Based Mras The Induction Motor Speed Sensorless Vector Control Research And Implementation

Vector control system of induction motor is based on vector coordinate transformation theory and energy conversion. Its principle is that the stator current can be decomposed into two DC components excitation current and torque current under synchronous rotating coordinate system based on rotor field orientation, Implementation of decoupling flux and torque control, so as to achieve the effect of DC motor control.Rotor Field Oriented Vector Control is great extent the performance of AC drive system .The technique of motor speed sensorless vector control improves the reliability of AC drive system, reduces the cost of production. However, such systems need to solve two problems: the rotor flux observation and speed estimation. Based on the previous research, According to the structure of vector control system which has speed sensor, a novel scheme of speed sensor-less field oriented vector control system based on MRAS(Model Reference Adaptive System)is proposed. The program using voltage space vector pulse width modulation (SVPWM) control technology and field-oriented control (FOC) algorithm, in accordance with the principle of MRAS, which is use to estimate the value of speed for vector control. The simulation results of the established model show that the MRAS-based field-oriented control system has good static and dynamic performance, meanwhile ,it is authenticated SVPWM control strategy is superior to current hysteresis band control menthodoIn terms of the simulation module of this scheme, experiments are conducted on TMS320F2812 digital signal processor chips, which is designed for motor control application, intelligent power modulation(IPM) to constitute the main power circuit, using software to estimate flux and speed, and SVPWM(space vector pulse width modulation) algorithm, The programs of each model is designed and debugged in CCS. The paper gives some experiment results .The results show that the vector control system for induction motor based on DSP has better Start-up and steady-state performance.Finally, the research work is concluded, and some suggestions for the next work are putforward.