---
title: "Shaft Currents and Electrical Discharges in Variable Frequency Drive Motors"
date: 2026-07-22
description: "Shaft Currents and Electrical Discharges in Variable Frequency Drive Motors Stray currents that pass through bearings occur in variable frequency drive (inverte..."
source: https://en.mshjzc.com/industrial-electric-motor-bearings/56369.html
---

# Shaft Currents and Electrical Discharges in Variable Frequency Drive Motors

## Shaft Currents and Electrical Discharges in Variable Frequency Drive Motors

Stray currents that pass through bearings occur in variable frequency drive (inverter) motors. These currents cause electrical erosion — micro-melting on the surfaces of raceways and rollers.

## Causes of Current Occurrence

- Induced currents from pulse-width modulation
- Static electricity
- Improper grounding
- High-frequency interference from the converter

## Solutions

Bearings with electrical insulation are used: ceramic coating on the outer ring or ceramic rollers. Bearings with an aluminum oxide insulating layer are employed. Installation of current-collecting rings and shaft grounding is recommended.