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Research Of Six-phase Induction Motor Control Technology

Posted on:2018-08-04Degree:MasterType:Thesis
Country:ChinaCandidate:G H LiFull Text:PDF
GTID:2322330542491221Subject:Control Science and Engineering
Abstract/Summary:PDF Full Text Request
With the rapid development of power electronic technology and digital controller,the six-phase induction motor attracts more and more scholars to study,also they have achieved certain result.Compared with the three-phase motor,six-phase motor has a lot of advantages,mainly in input low-voltage output high-power?high reliability and smaller torque ripple,so it is usually designed for the ship ? spacecraft and some electric cars.However,as a new technology,the research on six-phase motor is not ripe enough,we still have a long road to go.The main research object in this paper is six-phase motor with neutral point connected,we have done a lot of research about the SVPWM technology and DTC technology of the six-phase motor.First,we analyzes the mathematical model of the six-phase motor,further we build the simulation model of the six-phase motor by using the simulink software,the simulation experiments show that the model is feasible.Second,we analyzes the application of traditional SVPWM technology in six-phase motor,in order to solve the problem that the stator current harmonic is too serious,on the basic theory of decoupling transformation we put forward a theory called secondary middle vector SVPWM technology by improving the middle vector SVPWM technology that used in six-phase motor with neutral point unconnected,this method can effectively decrease the stator current harmonic.Then we build the simulation model of it in Simulink software,the simulation experiment result verifies the theoretical analysis,it shows that the algorithm is feasible.What's more,we analyzes the application of traditional DTC technology in six-phase motor,in order to solve the problem that stator current harmonic is too serious,we use the middle vector to replace the vector we used in traditional algorithm.Although it can effectively decrease the stator current harmonic,the torque ripple is still serious.Finally,we adopt the method that called SVPWM DTC based on secondary middle vector,it can not only effectively decrease stator current harmonic,but also decrease torque ripple.Then we build these three control system models in Simulink software,the simulation experiment result verifies the analysis,it shows that the algorithm is feasible.Finally,we do the experiment in the platform by using the secondary middle vector SVPWM DTC method,the experiment result verifies that the algorithm is effective and feasible.
Keywords/Search Tags:Six-phase Motor, Secondary Middle Vector SVPWM, Direct Torque Control, Current Harmonic, Torque Ripple
PDF Full Text Request
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