A dead-time compensation strategy for permanent magnet synchronous motor drive suppressing current distortion

This paper presents a dead-time compensation strategy for permanent magnet synchronous motor drives suppressing current distortion. Although dead-time effects can be compensated by a dead-time compensation voltage along with a current polarity, it is difficult to determine the current polarity when the phase currents are clamped to zero. If the current polarity is misjudged, the dead-time compensation operates improperly; as a result, both the phase current and commanded voltage are distorted. In this paper, a misjudge of the current polarity is appropriately corrected by the proposed correction algorithm. Simulation and experimental results confirm that the distortions of the phase current and commanded voltage are suppressed.