Motor Electrical Fluting Using Vibration Analysis to Detect & - - PowerPoint PPT Presentation

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Motor Electrical Fluting Using Vibration Analysis to Detect & - - PowerPoint PPT Presentation

Sep 05, 2022 199 likes •515 views

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

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SLIDE 1

Motor Electrical Fluting

Using Vibration Analysis to Detect & Prevent

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SLIDE 2

Outline

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

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SLIDE 3

Janelle Hammes

Electric Motor and

Repair, Inc

West Columbia, SC Originally from

Rockford, IL

In the motor

business for 2 years

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SLIDE 4

Vibration Description

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SLIDE 5

Cause & Effect

VFD Induced Shaft

Voltage

Higher Carrier

Frequency

Constant Speed

Operation

Inadequate

Grounding

Excessive

Loads/Over Heating

Bearing Damage Insulation & Bearing

Damage

Bearing Damage Bearing Damage Bearing Damage

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SLIDE 6

Identifying the Problems cont.

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SLIDE 7

Identifying the Problems

Vibration Analysis

helpful in confirming bearing fluting (damage)

Continuous

monitoring/testing from installation on is recommended

P.M is key

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SLIDE 8

Identifying the Problems cont.

Here are some examples of what to look for

when you are performing a vibration analysis.

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SLIDE 9

Identifying the Problems cont.

Here is a good comparison of the good bearing

vs the bad bearing. The difference is quite

  • bvious.
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SLIDE 10

Identifying the Problems cont.

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SLIDE 11
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SLIDE 12

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

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SLIDE 13
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SLIDE 14

Identifying the Problem cont.

SKF Electrical

Discharge Detector Pen

Does not tell you

what the problem is

  • nly a tool to assist

in detection

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SLIDE 15

Bearing life

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SLIDE 16

Bearing Life

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SLIDE 17

New Bearing Race

New bearing race will

be smooth

Track will eventually

form

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SLIDE 18

Bearing Damage

Pitting Early damage

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SLIDE 19

Bearing Damage Cont.

Birnelling

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SLIDE 20

Bearing Damage cont.

Fluting: “washboard” pattern. Vibration Noise

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SLIDE 21

Bearing Damage cont.

Rust damage /

corrosion

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SLIDE 22

Bearing Damage Cont.

Excessive load /

Overheating

Brinelling and

Discoloration

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SLIDE 23

Protection Methods

Shaft grounding

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SLIDE 24

Protection Methods cont.

Insulated/ceramic bearings or insulating the bearings

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SLIDE 25

Protection Methods cont.

Faraday Shield

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SLIDE 26

Protection Methods cont.

Sine wave filter Or DV/DT filter

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SLIDE 27

Protection Methods cont.

Conductive grease Can interfere with the

performance of the shaft protector

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SLIDE 28

Protection Methods cont.

Bearing Protection

Ring (SGR)

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SLIDE 29

Bearing Installation Tips

Handle with care Inspect shaft &

housing

Avoid overheating Use the same

bearing that is replaced

Use correct tools Pay attention Verify bearing ring &

bearing seat

Don’t clean new

bearings

Proper lubrication Rotate idle bearings Look for danger

signs

Find the cause of

failure

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SLIDE 30

Thank you