关键词: 永磁同步电机, SVPWM算法, 电流重构

Abstract:

In some applications where low cost is required, the phase current at the output side of the inverter can be effectively reconstructed by sampling the DC bus current. However, the duration of an effective vector may be so short that the current cannot be sampled reliably by the conventional space-vector pulse-width modulation (SVPWM) algorithm. An optimized method was proposed based on the traditional PWM phase shift, the anti-saturation mechanism was newly added, which can realize high-quality reconstruction of phase current. Experiment platform was established and the SVPWM was employed. The experimental results demonstrate the correctness and feasibility of the proposed method.

Key words: permanent magnet synchronous motor (PMSM), SVPWM control, current reconstruction