2018, Volume 13, Issue 3
Frontiers of Mechanical Engineering >> 2018, Volume 13, Issue 3 doi: 10.1007/s11465-018-0466-1
Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems
1. Electrical and Computer Engineering Department, University of Florida, Gainesville, FL 32611, USA.
2. CRRC Zhuzhou Institute Co., Ltd., Zhuzhou 412001, China
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Abstract
Electromagnetic interference (EMI) causes electromechanical damage to the motors and degrades the reliability of variable-frequency drive (VFD) systems. Unlike fundamental frequency components in motor drive systems, high-frequency EMI noise, coupled with the parasitic parameters of the trough system, are difficult to analyze and reduce. In this article, EMI modeling techniques for different function units in a VFD system, including induction motors, motor bearings, and rectifier-inverters, are reviewed and evaluated in terms of applied frequency range, model parameterization, and model accuracy. The EMI models for the motors are categorized based on modeling techniques and model topologies. Motor bearing and shaft models are also reviewed, and techniques that are used to eliminate bearing current are evaluated. Modeling techniques for conventional rectifier-inverter systems are also summarized. EMI noise suppression techniques, including passive filter, Wheatstone bridge balance, active filter, and optimized modulation, are reviewed and compared based on the VFD system models.
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