Investigation and mitigation of premature bearing degradation in motor drive system

Investigation and mitigation of premature bearing degradation in motor drive system

Pulse width modulated (PWM) variable frequency drives (VFDs) are commonly adopted in modern control of electro-mechanical drive systems. The use of insulated-gate bipolar transistor (IGBT) and higher switching frequencies has improved the efficiency of the motor drive systems significantly but they...

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Bibliographic Details
Main Authors: Fan, Fei, See, Kye Yak, Banda, Joseph Kiran, Liu, Xiong, Gupta, Amit Kumar
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
Subjects:
Engineering::Electrical and electronic engineering
Common-mode (CM) CM Voltage
Variable Speed Drives
Online Access:https://hdl.handle.net/10356/144726
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Institution: Nanyang Technological University
Language: English
Description
Summary:Pulse width modulated (PWM) variable frequency drives (VFDs) are commonly adopted in modern control of electro-mechanical drive systems. The use of insulated-gate bipolar transistor (IGBT) and higher switching frequencies has improved the efficiency of the motor drive systems significantly but they also cause high frequency common-mode (CM) currents in the motor bearings. Hence, new drive installations failed prematurely within months, which resulted in unnecessary downtime. Mitigation techniques such as CM filter and motor shaft grounding ring are possible solutions to prevent this kind of premature failure. In this paper, using a 5.5 kW motor drive system as a case study, the cause of bearing degradation is investigated and the various mitigation techniques are carefully evaluated.

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