Direct Torque Control of Permanent Magnet Synchronous Motor Based on Space Vector Modulation Control Readymade Electrical Projects



How to calculate the reference voltage vector is an important issue in space vector modulation direct torque control (SVM-DTC) of permanent magnet synchronous motor (PMSM). The effect of zero vector on electromagnetic torque during all speed range is analyzed on the basis of the relation between voltage vector and torque current component. And the analysis shows that in conventional DTC system of PMSM available voltage vector is only six which is the mainly cause of high ripple of torque. A robust SVM- DTC method of PMSM is designed in which the reference voltage vector is calculated with the flux position, error of torque and flux. The method is simple to implement and insensitive to motor parameters error. First order filter cascaded with high pass filter (HPF) is adopted to estimate stator flux accurately. The experimental results are carried out and show that the improved SVM-DTC has the advantage of simplicity, robustness and improved performance.


  1. PMSM
  2. Direct torque control
  3. Space vector modulation
  4. Torque ripple




Fig.1 Block diagram of improved SVM-DTC system



 a) Experimental waveforms of conventional DTC


b) Experimental waveforms of proposed SVM-DTC


Available voltage vector has only six which mainly causes high ripple of torque in conventional DTC. To maintain robustness and simplicity of conventional DTC system, a simple method of calculating amplitude and angle of the voltage vector is adopted in SVM-DTC. It requires only the torque and flux errors. The simulation and experimental results show that the proposed SVM-DTC scheme has excellent steady-state performance while retaining the merits of the quick dynamic responses, simplicity and robustness as in conventional DTC.


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[2] Yong-chang Zhang, Jian-guo Zhu, Wei Xu , You-guang Guo. A Simple Method to Reduce Torque Ripple in Direct Torque-Controlled Permanent-Magnet Synchronous Motor by Using Vectors With Variable Amplitude and Angle[J]. IEEE Transactions on Industrial Electronics, 2011, 58(7): 2848-2859.

[3] Gilbert Foo, M. F. Rahman. A novel speed sensorless direct torque and flux controlled interior permanent magnet synchronous motor drive [C]. Power Electronics Specialists Conference, Rhodes, Greece, 2008: 50- 56.

[4] Huaqiang Zhang, Xinsheng Wang, Pengfei Wei, etal. Study on direct torque control algorithm based on space vector modulation [J]. Electric Machines and control, 2012, 16(6):13-17.

[5] Jing Yuan; Xigeng Ma; Jiannan Liu. Simulation research of induction motor based on SVM-DTC with three-level inverter [J]. Electronics Information and Emergency Communication, China, 5th.2015, 410- 413.

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