PMSM DTC containing zero vector based on 18 section subdivision
ZHU Jun, WANG Dong, WU Yu hang, LI Xiang jun, XU Xiao zhuo
（School of Electric Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China)

Abstract: Aiming at the problem of that, in containing zero vector PMSM DTC system, the flux linkage distortion and flux linkage amplitude adjustment slowly around flux linkage circle sector boundary angle. According to the character of the zero vector, the relationship between voltage vector with flux linkage was analyzed, the root cause of this problems was elucidated, some shortcomings that zero vector applied in sector boundaries was pointed out, a solution of alternative zero vector that around the sector boundary angle areas was put forward. This method, flux circle was divided into 18 sectors, then, by choosing the optimal voltage vector to replace zero vector that around sector boundary Angle area, this region adjustment was made more flexible. In the paper, simulation model was establish used Matlab/simulink to the corresponding, experimental verification of the above theoretical analysis. The results shows that this scheme can effectively improve the flux and torque waveforms, and to provide corresponding basis for further research.

Key words: zero vector; direct torque control（DTC）; flux linkage distortion;18 section subdivision; replace the zero vector in partial area