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Webinar recording

Shaft and Bearing Currents

  • March 2020
  • Number of views: 16226
  • Article rating: 5.0
Recording duration: 60 Minutes

Presented by Chuck Yung
EASA Senior Technical Support Specialist

This webinar explains what shaft currents are, what causes them, and differentiates between the two common causes:

  1. Circulating currents which affect DC motors and AC motors not operating from a drive
  2. Shaft currents caused by operation from a VFD, and how to tell the difference between the two.

This webinar also discusses and compares methods to mitigate shaft currents and explains why the different causes of shaft currents require different solutions. It covers:

  • Shorted rotor iron
  • Uneven air gap
  • Unbalanced voltage
  • What type of grounding brush works best?
  • Role of carrier frequency in causing shaft currents
  • How to recognize the problem on site
  • Insulation thickness, capacitance, and types of insulated bearings

This information is useful to engineers, service center managers, mechanics and anyone interacting with customers.

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 4: Testing

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 8: Bearings

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 10: Bearings & Lubrication

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 10: Bearings & Lubrication

Root Cause Failure Analysis
  • Section 2: Bearing Failures

Fundamentals of DC Motors & Operation Tips
  • Section 11: Failure Analysis

Mechanical Repair Fundamentals of Electric Motors
  • Section 13: Shaft/Bearing Currents

Fundamentals of Pump Repair
  • Section 2: General Pump Repair Procedures

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Tags: Variable frequency drives Shaft currents Shaft voltage Shaft grounding
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