Shaft Grounding Ring Application Notes（轴接地环应用笔记）.pdfVIP

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Shaft Grounding Ring Application Notes（轴接地环应用笔记）.pdf

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Shaft Grounding Ring Application Notes（轴接地环应用笔记）

31 Winterbrook Road Mechanic Falls, ME 04256-5724 Toll free: 1-866-738-1857 Ph: 207-998-5140 Fax: 207-998-5143 sales@ Shaft Grounding Ring Application Notes: Subject: Maximizing the effectiveness of conductive microfiber shaft grounding ring (AEGIS SGR™) on NEMA/IEC and above NEMA/IEC frame motors 1. Introduction Motors with variable frequency drives (VFD) are subject to high frequency (HF) bearing currents that are caused by the common mode voltages that are inherent with pulse width modulation (PWM) VFD’s . In recent years conductive microfiber shaft grounding rings were successfully applied on VFD motors of all sizes to economically solve the problem of the premature bearing failure. 2. Review of inverter induced bearing currents A voltage source inverter presents a high frequency voltage source in the common mode circuit when PWM drives are used to control electric motors. The generated common mode voltage contains high frequency components that interact with capacitances inside machine that have not been of influence at line operation. As a result, different inverter induced bearing currents can occur that can be classified as follows. a. Discharge bearing currents (commonly referred to as EDM bearing