Research On Flying Start Of High-Speed Permanent Magnet Synchronous Motor With Sensorless Control

High speed permanent magnet synchronous motor(HSPMSM)generally adopts sensorless control,which reduces the cost and axial occupation of the motor,and is beneficial to improve the power density.At present,the sensorless control technology of HSPMSM focuses on the zero-speed starting condition,while there are relatively few researches on the rotated starting condition,also known as flying start.Therefore,in this thesis,a2.3k W/10000r/min HSPMSM is applied as the control object to study the flying start algorithm based on the model reference adaptive system(MRAS)sensorless control.The main content and innovative work of this thesis are as follows:1.The mathematical model of HSPMSM under the dq coordinate system is constructed.The principle of vector control and space vector pulse width modulation(SVPWM)is explained,expound the implementation of SVPWM,analyze the delay problem of the digital control system and introduce a compensation method.2.The principle and parameter design method of I/F starting are expounded,and a closedloop starting method to improve the steady-state performance of I/F starting is given.The effectiveness of closed-loop I/F starting is verified by experiments.The principle of the currentmode MRAS sensorless algorithm and the design method of the adaptive mechanism are explained,a tuning method of the PI parameters in the speed estimator is given.Finally,a control scheme based on closed-loop I/F starting combined with MRAS sensorless algorithm is proposed.The feasibility of the scheme is verified by experiments.3.It is demonstrated that the key to flying start is obtaining the initial motor speed and rotor position information.The principle of the short-circuit current vector method for calculating the initial speed and rotor position is expounded,and the flying start algorithm based on the short-circuit current vector method is proposed.The principle of the extended EMF decoupling and virtual resistance for suppressing the enable current of the inverter is presented,and the initial speed and rotor position information are obtained by solving the steady electrical signals generated by the stator windings.4.A HSPMSM experimental platform is set up.The design of the hardware and software system is expounded,the experimental verification scheme and process of the flying start algorithm are illustrated.The algorithm codes mentioned in each chapter are compiled and the relevant experimental programs are debugged in the CCS v10.1 environment.Finally,the experiment results are analyzed in detail.