Will any OEM's test motors bolted down?
Will any OEM's test motors bolted down?
(OP)
Motor OEM's typically test small/integral-hp motors on resilient mount as allowed by NEMA MG-1.
Are there any OEM's that will test a motor (in particular 100HP frame 365TS 3600RPM ODP horizontal induction motor) bolted down to a rigid base and guarantee the NEMA required vibration for that configuration (0.12ips pk) or preferably the IEEE843 vibration (0.08ips pk)?
I'd be interested to hear which ones. I haven't had much luck finding any that have the facilities to do it.
Are there any OEM's that will test a motor (in particular 100HP frame 365TS 3600RPM ODP horizontal induction motor) bolted down to a rigid base and guarantee the NEMA required vibration for that configuration (0.12ips pk) or preferably the IEEE843 vibration (0.08ips pk)?
I'd be interested to hear which ones. I haven't had much luck finding any that have the facilities to do it.





RE: Will any OEM's test motors bolted down?
Elecmec
RE: Will any OEM's test motors bolted down?
RE: Will any OEM's test motors bolted down?
http://www.iec.ch
IEC 60034-14 (1996-11) Ed. 2.0 Rotating electrical machines - Part 14: Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration
RE: Will any OEM's test motors bolted down?
To your point, NEMA frame size through 447 are tested on a resilent base while 449 and larger are tested clamped down to a massive cast iron plate. This is primarily a need to meet a certain cycle time requirements during testing while maintaining good repeatibility and reproducibility in our testing methods. Special vibration testing, such as bolted down, is an option and can be requested at time of order. However, I do not recommend this option because more than likely, the motor base will not be nearly as massive as a production test plate. To address your 2xlf vibration, if this is present on a resilient base and a rigid base, check your connection for adjacent pole connection, particularily on slow speed motors. Changing the connection to alternating poles may be a solution.
RE: Will any OEM's test motors bolted down?
RE: Will any OEM's test motors bolted down?
http://www.flynnresearch.net/power_conversion.htm
for more info and patent
RE: Will any OEM's test motors bolted down?
FYI ... IEC not applicable to NEMA frame motors....
from electricpete's original post:
"Motor OEM's typically test small/integral-hp motors on resilient mount as allowed by NEMA MG-1.
Are there any OEM's that will test a motor (in particular 100HP frame 365TS 3600RPM ODP horizontal induction motor)"
The motor he referenced is a NEMA design, not IEC.
cheers
RE: Will any OEM's test motors bolted down?
RE: Will any OEM's test motors bolted down?
Rotors are balanced in a separate machine, prior to being inserted in the frame of the motor.
I can't speak for all OEM's and their mfg'g processes, but some that I know of do bolt down the motors at final test on a bed plate for final testing.
Advise if you would like further information and I will be happy to put you in touch with someone who has responsibility for test at a major motor OEM and is also a member of the NEMA committe for motors and generators.
RE: Will any OEM's test motors bolted down?
http://www.thomasregister.com
and type Vibration Analysis Services under Product or Service, which will return 160 companies to inquire about your particular motor test needs.
RE: Will any OEM's test motors bolted down?
I remain of the firm conviction that customers are wise to specify their integral horsepower 2-pole motors to be tested on a rigid mount (rather than allowing supplier to choose either rigid or resilient allowed by NEMA). The rigid mount configuration is closer to installed configuration and 2*Line Frequency vibration can be considerably higher when rigidly mounted.
RE: Will any OEM's test motors bolted down?
Electricpete posted about a particular NEMA frame motor, and you posted:
jbartos (Electrical) Apr 19, 2002
Suggestion: Try http://www.iec.ch
IEC 60034-14 (1996-11) Ed. 2.0 Rotating electrical machines - Part 14: Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration
Kinda like someone asking about "growing conditions for Oranges", and he receives a reply about "Carrots"
Relevance ?
To paraphrase from Johnny Cochran's summation at the O.J. Simpson trial,:
"If the standard don't fit; you got to omit."
cheers
RE: Will any OEM's test motors bolted down?
http://www.iec.ch/cgi-bin/procgi.pl/www/iecwww.p?wwwlang=E&wwwprog=cat-det.p&wartnum=021632
and notice that the standard deals with the motor speeds up to 3600RPM.
RE: Will any OEM's test motors bolted down?
Sorry jbartos, but the IEC spec your reference has no relevance or applicability to N E M A frame motors...
repeat: IEC not appropriate or applicable to N E M A Frame Motors.... which is the motor of this discussion thread.
As IEC is to Europe (in particular), NEMA is to the USA, and at this time, the twain do not meet. Motors in the USA are designed and manufactured to N E M A standards; not IEC. (Why do you think that is ?)
IEEE and IEC are presently working on evolving common standards; that is, standards that will be accepted in both Europe and the USA.
Maybe someday there will be commonality between IEC and NEMA.... but that day isn't now, and it isn't tomorrow.
I'm curious, do you think that bringing non-relevant references into a discussion adds clarity and meaningfulness?
Hmmmm.