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Motor Electrical Fluting

This document discusses using vibration analysis to detect and prevent bearing damage in electric motors. It covers identifying problems through vibration analysis, examples of good and damaged bearings, and protection methods like shaft grounding, insulated bearings, and filters. Bearing life cycles are examined, showing the progression from new to damaged states like pitting, fluting, and corrosion. Proper bearing installation techniques and preventative maintenance are emphasized.

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429 views30 pages

Motor Electrical Fluting

This document discusses using vibration analysis to detect and prevent bearing damage in electric motors. It covers identifying problems through vibration analysis, examples of good and damaged bearings, and protection methods like shaft grounding, insulated bearings, and filters. Bearing life cycles are examined, showing the progression from new to damaged states like pitting, fluting, and corrosion. Proper bearing installation techniques and preventative maintenance are emphasized.

Uploaded by

921157
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Motor Electrical

Fluting

Using Vibration Analysis to Detect


& Prevent
Outline

 Introduction
 Cause & Effect
 Identifying the Problem
 Bearing life
 Bearing examples
 Protection Methods
Janelle Hammes

 Electric Motor and


Repair, Inc
 West Columbia, SC
 Originally from
Rockford, IL
 In the motor
business for 2 years
Vibration Description
Cause & Effect

 VFD Induced Shaft  Bearing Damage


Voltage
 Higher Carrier  Insulation & Bearing
Frequency Damage
 Constant Speed  Bearing Damage
Operation
 Inadequate  Bearing Damage
Grounding
 Excessive
 Bearing Damage
Loads/Over Heating
Identifying the Problems cont.
Identifying the Problems

 Vibration Analysis
helpful in confirming
bearing fluting
(damage)
 Continuous
monitoring/testing
from installation on is
recommended
 P.M is key
Identifying the Problems cont.

 Here are some examples of what to look for


when you are performing a vibration analysis.
Identifying the Problems cont.

 Here is a good comparison of the good bearing


vs the bad bearing. The difference is quite
obvious.
Identifying the Problems cont.
Identifying the Problems cont.

 Voltage Analysis can


be used to determine
the likelihood of
damage
 This method is not
an exact science,
however it is helpful
Identifying the Problem cont.

 SKF Electrical
Discharge Detector
Pen
 Does not tell you
what the problem is
only a tool to assist
in detection
Bearing life
Bearing Life
New Bearing Race

 New bearing race will


be smooth
 Track will eventually
form
Bearing Damage

 Pitting
 Early damage
Bearing Damage Cont.

 Birnelling
Bearing Damage cont.

 Fluting: “washboard” pattern.


 Vibration
 Noise
Bearing Damage cont.

 Rust damage /
corrosion
Bearing Damage Cont.

 Excessive load /
Overheating
 Brinelling and
Discoloration
Protection Methods

 Shaft grounding
Protection Methods cont.

 Insulated/ceramic bearings or insulating the bearings


Protection Methods cont.

 Faraday Shield
Protection Methods cont.

 Sine wave filter


 Or DV/DT filter
Protection Methods cont.

 Conductive grease
 Can interfere with the
performance of the
shaft protector
Protection Methods cont.

 Bearing Protection
Ring (SGR)
Bearing Installation Tips

 Handle with care  Verify bearing ring &


 Inspect shaft & bearing seat
housing  Don’t clean new
 Avoid overheating bearings
 Use the same  Proper lubrication
bearing that is  Rotate idle bearings
replaced  Look for danger
 Use correct tools signs
 Pay attention  Find the cause of
failure
Thank you

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