Current segmentation control method of permanent magnet motor based on duty cycle modulation

Abstract

In the control system of permanent magnet synchronous motor, in order to improve real-time performance and computational complexity, a new method of implementing segmented current control of permanent magnet motor using duty cycle modulation is proposed. The term plane is divided into three sectors through three-phase voltage vector, and current prediction iteration is performed to obtain the relevant duty cycle, and the periodic modulation of this method (DM-MPCC) is verified by experiments and the traditional DV-MPCC (DV-MPCC), the method is repeated more than 150 times, the time required for this method is 2.863 s, saving 52.073% of the computing time, while the modulation duty of DM-MPCC It is also more stable than the waveform, and the current THD = 2.986% DM-MPCC is much lower than the conventional method. DM-MPCC has less pulsation on the dq axis at full speed than DV-MPCC. The results show that the method has a faster operation speed and better real-time performance, which shows the superiority of this method in practical applications.