The Vector Control System Of Asynchronous Motor Based On Speed Estimation Of Fuzzy Neural Network

First, the paper reviews the development and research of AC transfer speed system, introduces the different control strategy of transfer speed system for asynchronous motor, and discusses the basic principle of vector control system for asynchronous motor in detail,including the mathematics model and coordinate transformation of asynchronous motor, the fundamental equation of vector control, the estimation method of rotor flux, the system structure of vector control etc. Then, the paper lays stress on the fundamental principle, control algorithm and realization method in TMS320LF2407 of space vector pulse width modulation (SVPWM) technology.From the application of engineering practice angle, the paper designs and develops the speed sensor vector control system of asynchronous motor based on DSP (TMS320LF2407), and gives the structure of hardware and software. The power circuit of the system adopts the voltage frequency conversion structure of AC-DC-AC, and is composed of the commutation circuit, filter circuit and intelligence power module (PM15RSH120). Control circuit takes the DSP chip TMS320LF2407 as core, including the PWM signal occurrence circuit, detect circuit of stator current and direct current voltage of generatrix, drive circuit of intelligence power module, detect circuit of speed, protect circuit of system etc. All of this builds the full digital vector control system of asynchronous motor.Based on the former research, the paper carries on a beneficial quest of the speed sensorless vector control system for asynchronous motor. The improved voltage model of rotor flux is proposed in the paper. It eliminates the influence to actual system function in the voltage model of rotor flux for the proper drift problem and cumulative error of pure integral calculus tache. Based on the traditional adaptive system, the fuzzy neural network replaces the original organization in the paper. A kind of new method of speed estimation based on fuzzy neural network, and the structure and learning algorithm of fuzzy neural network are proposed in the paper. The simulation result shows that the vector control system of asynchronous motor based on speed estimation of fuzzy neural network has a good performance.