Seamless Switching Control Utilizing Zero-Voltage Vector Intervals for PMSM Winding Reconfiguration

Stator winding reconfiguration technology has attracted extensive research owing to its capability to dynamically regulate the torque-speed output characteristics of motors and expand their high-efficiency operation range. This paper proposes a fast and seamless switching control strategy for the series-parallel winding reconfiguration system of permanent magnet synchronous motors (PMSMs), where fully controlled power electronic devices are employed as reconfiguration switches. The key innovation lies in achieving winding reconfiguration entirely within the zero-voltage vector (ZVV) interval of a single SVPWM period. Compared with conventional winding switching methods, this approach yields three salient advantages: first, it eliminates potential surge voltages without resorting to additional hardware snubber circuits; second, it circumvents the issues of asymmetric operation and torque interruption inherent to conventional schemes; third, it reduces the reconfiguration transient duration from the millisecond level to several microseconds. In this study, the minimum ZVV interval required is only 8 μs, within which the intermediate transition state for reconfiguration occupies merely 5 μs. The detailed mechanism and implementation are described, while simulation and experimental results confirm the effectiveness of the proposed method.