基于载波移相技术的强耦合双支路电机共模电压抑制研究

Research on Common Mode Voltage of Highly Coupled Dual-branch Motors With Carrier Phase Shift

在大功率永磁同步电机应用场合,由电机传导出来的高频振动噪音的舒适度逐渐变成一个重要的因素。采用载波移相技术两并联逆变器驱动的强耦合双支路电机因特殊的绕组结构能够有效地消除奇数倍载波频率附近的高频振动噪音而逐渐得到广泛应用。除了对电机高频噪音的抑制外,系统运行过程中也应考虑对传导的电磁干扰进行抑制。对于一般结构的电机,载波移相技术能够有效地抑制电机共模电压的幅值。但对于具有特殊绕组结构的强耦合双支路电机,采用载波移相技术对其共模电压是否存在抑制能力还没有被分析和验证。这篇文章的目的是通过理论分析与实验验证确定对强耦合双支路电机采用载波移相技术能够有效地抑制电机的共模电压,抑制系统传导的电磁干扰。

In high-power permanent magnet synchronous motors applications,the comfort level of high-frequency vibration noise emitted by the motors has gradually become an important factor.The highly coupled dual-branch motors driven by two parallel inverters using carrier phase shift technology have gradually been widely used due to its special winding structure,which can effectively eliminate high-frequency vibration noise near odd times the carrier frequency.In addition to suppressing high-frequency noise of the motors,suppression of conducted electromagnetic interference should also be considered.For general structure motors,carrier phase shift technology can effectively suppress the amplitude of the common mode voltage of the motors.However,for highly coupled dual-branch motors with special winding structures,the use of carrier phase shift technology to suppress their common mode voltage has not been analyzed and verified.The purpose of this article is to determine through theoretical analysis and experimental verification that using carrier phase shift technology for highly coupled dual-branch motors can effectively suppress the common mode voltage and effectively suppress conducted electromagnetic interference.