MOTOR "NAMEPLATE DATA" 1

[aolalde]

I have been in this forum around one year. A few inquirers give the complete Name Plate Data of the motor and application when they make a post.
Manufacturer, HP, full load rpm, Voltage, phases, frequency, full load current, frame size, enclosure type and cooling system, bearings, lubrication, mounting, type of coupling, coupled load.
Is this too much?
The motor parameters and application are the basis to make any judgment or analysis, without that information we are always guessing instead of working out a straight answer to the problem.

 

[ScottyUK]

I think you are spot on with what you are asking for. Without it, threads become speculative. If the originator can't be bothered to get the data, are they worth helping? There may be the odd occasion where all the data simply isn't available, but these instances should be in the minority.



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If we learn from our mistakes,
I'm getting a great education!

 

[UKpete]

aolalde, can I add one other piece of information to your list - country of origin. Most members are US based but it would be useful to know where people are, for example are they in IEC territory rather than NEMA. This may also encourage a geographically wider participation, as far as the language barrier permits.

 

[vanstoja]

A tabulation of required and optional motor nameplate data in Moon,C.G.,1963,"Interpreting Motor Nameplates", Machine Design,9/26/63,pp.168-177 for induction(squirrel-cage & wound rotor), synchronous and Direct Current motors based on NEMA MG 1-1963 does not include the last four items on your list and shows that bearing numbers and enclosure type are optional rather than required. I don't know what the current NEMA nameplate requirements are. Presumably, other worldwide motor design standards may have different nameplate requirements. I totally agree with your plea for more definitive data in queries but you may have to settle for what's actually on the nameplates of the various design types. A more recent, informative article on motor nameplate data is Bos,M.H.&Brown,M.V., 1991, "What's in a Nameplate?", Power, July, pp.51-53.

 

[TomG33]

Aolalde,
I agree completely with what you say, The more that is known about an application and the motor itself , The more specific the answers can Be.

I have been the country application Engineer for a well known Brand of motors and I frequently get questions about application problems and motor replacemnet requests, and in almost every new request, The very things you ask for missing, Usually the comment "Just a standard Induction WXY Kw Motor is what I need" is offered.
I do not think that the data is ommited because the writer is too lazy to get it, But rather they think it is not necessary and that the type of load does not matter. Usually on repeat calls, all the necessary information is available as the caller does not want to spend forever on the problem.

Back to this news group, Obviously there are visitors to this group that only come here with a specific Question in Mind. They have not followed the threads, and have not learn't the "Protocol" so to speak. These usually start with words to the effect of "I am not sure if this is the right place to be, but here goes anyway........."

Becaise of this, I bleieve we are destined to keep asking over and over for the same information.
Such are the joys of being part of these forum's.

Tom G

 

[Marke]

Totally agree.
I have told many people that our ability to help them is often hindered by their ability to ask for help. The clearer the picture is, the clearer the answer can be.
The other point that I like to make, is when you ask for help, do not filter the information down to what you believe is relavent. Often the clue is hidden in the information that is not given. State the obvious as well as the more esoteric. Do not put a bias on the information based on your own assumptions. The better the picture is painted, the easier it is for someone else to get a good overall understanding and the easier it usually is to gain the solution.

Best regards,

Mark Empson

http://www.lmphotonics.com

 

[busbar]

 
A very worthwhile discussion, aolalde. Related to namepaltes and other electrical subjects postings at eng-tips, something that can freeze understanding of a problem dead in its tracks is use of an abbreviation [that might be in everyday use by the original poster but may not be by international readership.] Safe to say most take for granted V, A, Y-D or RPM, but stuff like “b/c, m/c, s/c, and SCIM” has driven me nuts at times…“because, machine, squirrel cage and squirrel cage induction motor.”

I don’t mind readily volunteering my time if I feel I can help based on my experience, but thankfully we are eons past teletypes with all-uppercase characters and unnecessary abbreviations [but also hopeless 47-character model numbers for an 11-lead 1/6-hp Slinger-Woolpearl washing machine motor, of which a million were produced in October 1977.]

 

[kilger]

Does anyone know of how to analyze the impact of overdriving a motor from 60 Hz to 66 Hz? At 66 Hz, I am still below the FLA rating of the motor. I just need a bit more power.

 

[UKpete]

kilger, did you mean to post this on an old thread?

It sounds ok especially if it's a TEFC as there will be more cooling air. Incidentally, there is another thread on the subject going on at the moment:
thread237-117201

 

[vanstoja]

kilger
See also Thread237-115127 on motor maximum speed.