Research on Dual Three‐Level Drive Topology and Modulation Method of Open‐End Winding PMSM With Dual Voltage Gain

This paper proposes a dual three‐level drive topology for an open‐end winding permanent magnet synchronous motor with two voltage gains and develops a corresponding control method. First, through the time division multiplexing of the DC source, this topology can achieve a voltage gain of 2 when higher voltages need to be output, thereby expanding the linear modulation range of the system and improving voltage utilization efficiency. Second, when the output voltage is low, this topology can also operate with a voltage gain of 1 through appropriate control, ensuring that the system can still output a five‐level phase voltage at low voltage, avoiding the level degradation problem of traditional inverters under low modulation index and improving the low‐speed performance of the system. The experimental results verify the effectiveness and feasibility of this strategy.