DTC in MT coordinate system for permanent magnet synchronous motor used in electric vehicle
XIA Jia-kuan
BI Liang
LI Rui-ze
HE Xin
Abstract：Aiming at the problem that the low-speed torque ripples exist in the direct torque drive technology in the application of electric vehicle power system and the power system has high requirements in the speed regulation range for the constant power, a novel direct torque control (DTC) system for the permanent magnet synchronous motor (PMSM) in MT coordinate system was proposed. The proposed system worked in a reference coordinate system which would synchronously rotate with the stator flux linkage, and an improved MTPA control was used to realize the calculation of reference flux. In addition, the flux estimation was realized with the flux error integral generated by the stator flux controller. Besides,the flux estimation errors generated by the voltage saturation of inverter were compensated in the proposed system with different voltage vectors to enhance the accuracy of flux estimation. The simulation results show that the low-speed torque ripples can be effectively reduced and the speed regulation range is widened in the proposed system.
Keywords：electric vehicledirect torque controlmaximum torque per ampere controlpermanent magnet synchronous motor (PMSM)flux-weakeningMT coordinate systemcompensationtorque ripple
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 241-247 )