Abstract

The effect of power supply and/or motor asymmetry on the phase-load distribution and the ripple of electromagnetic torque in a polyphase drive is studied by the method of symmetrical components. It is shown that the presence of asymmetry causes the mapping of all harmonics in the supply voltage into all planes of symmetrical components and eliminates the possibility of independent control of harmonics. The dynamic model of a five-phase squirrel-cage induction motor demonstrates that even minor phase or amplitude asymmetry causes asymmetry in the phase load and ripple of the electromagnetic torque. Their level eliminates the possibility of continuous operation of the motor in this mode and requires the use of control systems that provide load balance in the intact phases.

中文翻译：

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多相电机和驱动器中的非对称模式

摘要

通过对称分量法研究电源和/或电机不对称对多相驱动器中相负载分布和电磁转矩脉动的影响。结果表明，不对称性的存在导致电源电压中的所有谐波映射到对称分量的所有平面，并消除了对谐波进行独立控制的可能性。五相鼠笼式感应电机的动态模型表明，即使是很小的相位或幅度不对称也会导致相位负载和电磁转矩纹波的不对称。它们的水平消除了电机在这种模式下连续运行的可能性，并需要使用控制系统来提供完整相位的负载平衡。