Research On The Speed Sensorless Vector Control System For Six Phase Induction Motor

With the development of power devices and micro-processor, esppecially the high performance turn-off devices and digital signal processing, the AC drive speed control technology has made good progress. The multiphase induction motor has made great advances on the base of the conventional three-phase drive. The multiphase induction motor has the advantages of high reliability, high power but low dc power and low torque ripple. There are wide application prospects in the aspects of requirements for high power but the voltage is limited, such as nuclear reactor water supply system, ship propulsion system, electric automobile and aerospace etc. However, the theory of multiphase induction motor is still in its initial stage and incomplete, so the application range have been limited. Therefore, it is a hot spot of researching on the multi-phase induction motor in recent. At present, some domestic universities and scientific research institutes start the research of multiphase induction motor. But it is less that the research of speed identification of multiphase induction motor. Under this background, this paper references the method of three-phase induction motor speed identification and researches on the speed sensorless vector control system of six phase induction motor.This paper chooses the six induction of double Y shift30°winding as the object of study. According to the characteristics of its spatial winding, analysing the mathematical model of six phase induction motor. Introducing the equation of voltage, current, flux linkage and motion, and according to the mathematical equation establish the simulation model. Aiming at the characteristics of double Y shift30°winding and using the method of SVPWM vector control of three-phase induction motor to establish the SVPWM vector control system of double Y shift30°winding’s six phase induction.Because the research of multiphase induction motor is still in the initial stage, the study of multiphase induction motor speed identific is rarely. We design the adjustable model with neural network by utilizing the neural network can approximate arbitrary and referencing the speed identification method of three-phase asynchronous motor. Through the BP algorithm to adjust the weights of the neural network to adjust the error of the reference model and the adjustable model of the rotor flux. Neural network method has good dynamic and static performance, strong anti-interference ability, self-learning ability and strong robustness.In the MATL AB/simulink simulation platform, I do the simulation of the vector control method and the neural network speed identification method of six induction motor. Then I have analysed the performance and ability of six induction motor vector control and speed identification in various working conditions and verifying the correctness of the theory.At last, I design the control circuit by using TMS320F28335as controller chip. According to the six phase induction motor SVPWM vector controlalgorithm, I designed software algorithm. Through the exeriment of six phase induction motor vector control to prove feasibility and prepareing for the follow study.