Research On Vector Control Of Electromotive Force Based On Speed Of BDFM Motor Power Winding

As a new type of AC induction motor developed in recent years,BDFM(Bushless Double Feedback of Motor)consists of two sets of stator windings with different pole pairs and a set of rotor windings.BDFM combines the advantages of cage-rotor induction motors and wound-rotor induction motors to achieve synchronous,asynchronous and variable frequency speed operation.As a frequency conversion speed control motor,the power of the inverter only accounts for a small part of the total power of the motor,which can greatly reduce the capacity of the inverter and reduce the cost of the inverter.In addition,it also has the property of adjustable power factor,which can improve the force and energy index of the speed regulating system,reduce the line loss and reduce the reactive power compensation.This thesis mainly focuses on the vector control speed regulation as the control point,through the control of sizes and phases of control winding voltage,so as to control the active component of the power winding,and ultimately achieve the purpose of controlling the motor torque.Firstly,the working principle of BDFM speed regulation is studied,the motor has two sets of stator windings with different poles,the stator windings are modulated by the rotor windings through the magnetic field,so that the control winding generates the speed electromotive force which can adjust the active component of the power winding,and completes the electromechanical energy conversion.Secondly,according to the relationship between the speed electromotive force generated by the control winding magnetic field and the active component of the power winding,the mathematical model of steady-state equivalent circuit is established.The coordinate transformation is performed on the basis of the steady-state equivalent circuit,and the mathematical model of the primary and secondary windings in the rotating coordinate system based on the speed electromotive force is obtained.In addition,the torque current in the rotating coordinate system of the control winding is under directional control,the relationship between the current and the active component of the power winding is established,and the relationship between the torque and the active component of the power winding based on the speed electromotive force is established,and the conclusion is drawn.Finally,the vector control simulation model of BDFM speed regulation system is established,and the results are compared and analyzed.