Research on the damage characteristics and failure mechanism of bearing shaft current in variable frequency motors
WANG Haoyi
LIAO Haize
LI Xuejun
XIAO Dongming
Abstract：High power variable frequency motors commonly suffer from shaft current damage,which drastically accelerates bearings'the fatigue wear process and leads to premature bearing failure.The formation mechanism of this failure mode is complex and difficult to quantify.This article firstly analyzes the surface morphology characteristics of the rough scratch width and depth of the raceway and ball of ordinary/insulated bearings under the failure of shaft current damage,then studies the influence mechanism of working conditions on the inner and outer ring shaft current damage of bearings,and meanwhile deduces the fatigue wear evolution process of bearings under shaft current damage over time.The degree of damage caused by shaft current is ranked as follows:ordinary bearing inner raceway load area>ordinary bearing outer raceway non load area>ordinary bearing outer raceway load area>ordinary bearing outer raceway non load area>insulated bearing inner raceway>insulated bearing outer raceway load area>insulated bearing outer raceway non load area.
Keywords：shaft current damagemotor bearingssurface morphology featuresfailure mechanism
Publication Date：2025-09-30
Online Publishing Date：2025-10-15(First online date of this platform, not the publication date of the document)
Pages：9( 9-17 )