Direct Torque Control Of The Permanent Magnet Synchronous Motors System

With the development of the modern manufacture technology,the electrical and electronics technology and the computer control technology,Servo systems are used more and more in the industrial controllers and household appliances.Digital controlled AC servo systems will be the trend,which uses Permanent Magnet Synchronous Motors(PMSM)as power units and Direct Torque Control strategy, based on DSP.So it is very important to study the high performance AC servo systems.In this paper,the author does research and improve on the Direct Torque Control system of the Permanent Magnet Synchronous Motors.Direct Torque Control is a new technology of frequency conversion timing after Field Oriented Control (FOC)in the field of AC drive systems.The DTC control is a very great control method,because DTC has very fast response of torque dynamic performance and its struggle is also very simple,but only one space voltage vector is used in each sampling period in PMSM DTC servo systems that results in large ripples of torque and stator flux linkage.Because of DTC's weakness,a new direct torque control of PMSM based on reducing the torque ripple is proposed.It can realize continuous voltage vector modulation and decrease the torque ripple and enhance the performance of AC drive systems.The simulating models of DTC and DTC—SVM are built,and experiments on these are also carried out.The results of simulation and experiments show:The control strategy of DTC is very good and the control of DTC—SVM is perfect!...