Blind Phase Current Reconstruction Strategy of Permanent Magnet Synchronous Motor Based on SVPWM

The development of motor control application technology to today mainly focuses on two points of continuous improvement, one is to improve efficiency, and the other is to reduce system costs. These are also the two main factors driving the improvement of existing motor control technology. In this paper, the three-phase current of PMSM is reconstructed based on the space vector pulse width modulation technology and the current information on the DC bus, aiming at the error and high cost caused by the multi-current sensor during phase current sampling. At the same time, in order to solve the problem of blind area, pulse shift method is used to reconstruct the current in the blind area (sector switching area and low modulation area) under the linear modulation area. In the overmodulation region, because the pulse shift method is no longer applicable, the reconstruction method is improved, and the current sampling method of the lower bridge arm is adopted. The proposed method is simulated in the simulation software, and the reliability and effectiveness of the proposed current sampling technique are verified by comparing the simulation results.