Previous in Forum: Hoop Stress In Short Cylinders   Next in Forum: Strainer Selection for Pump Suction
Close
Close
Close
7 comments
Rate Comments: Nested
Participant

Join Date: Apr 2012
Posts: 2

Electrical Motor Shaft Axial Float Measuring Device

04/19/2012 1:10 AM

I want to know if there is any sensor for measuring online the axial float when the motor is running at 100% rpm. If any, what is the principle and from where can I get that?

Thanks

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#1

Re: Electrical motor shaft axial float measuring device

04/19/2012 1:28 AM
__________________
All living things seek to control their own destiny....this is the purpose of life
Register to Reply
Participant

Join Date: Apr 2012
Location: Oyu Tolgoi Copper Mine, South Gobi Desert, Mongolia
Posts: 3
#2

Re: Electrical motor shaft axial float measuring device

04/19/2012 1:55 AM

I am not aware of any equipment that would be permanently installed that would provide real time data of shaft float in the axial plane. However a good millwright should be able to make a one-time measurement while the motor is running through various means.

I suspect you are only trying to figure out just how far the shaft is moving while the motor is running for troubleshooting purposes, in an effort to solve another problem. A motor on ball bearings shouldn't have any axial float, at least not any that would be detectable or that would cause a problem. Sleeve bearing motors that are properly aligned and coupled also should not have any axial float when running. Sometimes failures of the driven equipment can cause axial float of a sleeve bearing motor shaft.

The simplest method for determining whether a shaft is moving or not is to use a strobe light. Additional preparations can be made to enhance the effect of the strobe, such as bluing and marking the shaft with a scribe.

__________________
Fluor Corporation
Register to Reply
Participant

Join Date: Apr 2012
Posts: 2
#3
In reply to #2

Re: Electrical motor shaft axial float measuring device

04/19/2012 2:27 AM

Can you elaborate this strobe light principle and how is this float measured.

Register to Reply Off Topic (Score 5)
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#4

Re: Electrical motor shaft axial float measuring device

04/19/2012 8:40 AM

I'd use a vibration sensor. You'll need to establish some criteria to help determine the amount of float.

Register to Reply
Power-User
Canada - Member - New Member

Join Date: Feb 2010
Location: The Great White North
Posts: 185
Good Answers: 13
#5

Re: Electrical Motor Shaft Axial Float Measuring Device

04/20/2012 4:03 PM

Shoot the non drive end of the motor shaft with a laser sensor while the motor is running and during load changes.

__________________
Knowledge makes what was impossible, seem easy.
Register to Reply
Participant

Join Date: Jun 2012
Posts: 1
#6

Re: Electrical Motor Shaft Axial Float Measuring Device

06/10/2012 2:26 AM

I am not aware of any equipment that would be permanently installed that would provide real time data of shaft float in the axial plane.

har restoration california

Register to Reply
Associate

Join Date: Feb 2013
Location: Australia
Posts: 26
Good Answers: 2
#7

Re: Electrical Motor Shaft Axial Float Measuring Device

02/07/2013 2:17 PM

A displacement/proximity probe could be used, but you need something to measure against, like a collar or something equivalent on the rotor. One such probe is made by GE - Bently Nevada, model 3300xl proximity probe. I'm sure there are other cheaper brands out there though

__________________
Give me ambiguity or give me something else...
Register to Reply
Register to Reply 7 comments
Copy to Clipboard

Users who posted comments:

Elroy (1); lyn (1); mechanic58 (1); MickiDover (1); peterjh (1); SolarEagle (1); vimalraj87 (1)

Previous in Forum: Hoop Stress In Short Cylinders   Next in Forum: Strainer Selection for Pump Suction

Advertisement