Vector Control Of Brushless Doubly-fed Machine With Cage-rotor Based On Slip Frequency Rotating Frame

The vector control method of Brushless doubly-fed machine is more different from that of traditional induction machine because of its special structure. The contrast analyses are done for brushless doubly-fed machine with different rotor structure, mathematics models, magnetic field energy conversion relation, equivalent circuit and vector control method are analyzed in detail, some research results which have important significances and applied values are obtained. The main tasks that this particular done are as follows:Firstly, mechanism electric energy principle is analyzed based on structure and electric magnetic regulator of reluctance-rotor and cage-rotor brushless doubly-fed machine. Two air magnetic field components are found. From angle of different poles and speeds between power winding and control winding, "poles regular" theories are used to explain this problem.Secondly, mathematical model was put forward based on slip frequency rotating frame, equivalent circuit of cage-rotor brushless doubly-fed machine through converting power winding vectors and control winding vectors to rotor.Vector control method of BDFM in slip frequency rotating reference frame is put forward. The active and reactive component of the power winding could be controlled through controlling control winding current, the indirect magnetic field directional method is built which is adaptive to vector control of BDFM.Thirdly, motor model, inverter model, Control system based on slip frequency rotating frame are built by Matlab, open-loop and closed-loop simulation tests are done between reluctance-rotor and cage-rotor motor. Some excellent performances just as speediness are validated of this control method between this method and V/f control method.