Research On Variable Frequency Speed Regulating System Of Asynchronous Motor Based On SVPWM

With the development of semiconductor technique, and the TMS320LF2407DSP controller, the accurate asynchronous motor model and all kinds of advancedtheories that have resulted in the development of a highly reliable drive with highlyaccurate and variable speed controls.Vector Control System(VC) is one of the advanced theories, which is based onmotor unification principle, energy conversion and vector coordinate transformationtheory. It has many advantages such as novelty, practicability and advancement. Bytransforming the model of AC motor to DC motor, the stator current is decomposedinto two DC parts which are orientated towards the rotor magnetic field andcontrolled respectively. Thus the magnetic flux and torque are decoupled. In whichway, It controls the asynchronous motor in a synchronous way.This thesis introduces the correlative information of variable frequency speedregulating, vector control system of asynchronous motor, and expatiates SpaceVector Pulse Width Modulation(SVPWM). The principle of SVPWM is in-depthdiscussed, and the algorithm for SVPWM is ratiocinated.By using MATLAB/SIMULINK dynamic simulation software, through theprinciple of the vector control system, get the structure model of variablefrequency speed regulating system of asynchronous motor based on SVPWM, givenall the detailed subschema and plan all the data, using the algorithm for SVPWM,the simulated model of variable frequency speed regulating system fed by SVPWMinverter is set up for asynchronous machine. Through the simulated model, get theresult and analyzed it in detail.On the side of software, the module software is written by assembly languageand C code so that can be amended and replanted easily.