The VFD Challenge
Variable frequency drives (VFDs) are popular across multiple industries due to their ability to reduce energy consumption and generate significant cost savings. However, these drive systems also contribute to unplanned downtime. VFDs induce high frequency voltages on the shaft that seek a path to ground. When these voltages exceed the lubricant’s ability to provide insulation, they discharge through the motor’s bearings, or the bearings of coupled equipment, causing fusion craters, pitting, frosting and fluting on the bearings. This leads to premature bearing failure.