Premium Efficient VHS Motors
Premium Efficient VHS Motors
(OP)
Is there any National Standard for Vertical Hollow Shaft PREMIUM EFFICIENT Motors such as EPAct for horizontal?
How to define "Premium Efficient" motors?
The nominal full load eff on Premium Eff Motors has to be over 93.6%!?
Thank you in advance!
How to define "Premium Efficient" motors?
The nominal full load eff on Premium Eff Motors has to be over 93.6%!?
Thank you in advance!





RE: Premium Efficient VHS Motors
Thanks!
RE: Premium Efficient VHS Motors
Reliance is one I have heard of. Baldor is other (not sure that fall under "leading").
I think word premium effieciecy is term used by manufactures, and not directly related to any standard. Check NEMA MG standards and some Energy Codes which in fact specifies efficiencies for motors and transformers. Energy Codes vary by states here. But ASHRAE may have some published documents on this.
I do not deal with this type of work in such detail, so only can give you some hints. Hope fully someone expert in motor specs can help you.
RE: Premium Efficient VHS Motors
I don't believe the NEMA efficiency standards extend to vertical hollow-shaft motors, but I'm not sure about that. Best approach is to get the manufacturers to give you an expected efficiency then put something in your motor spec to require a minimum efficiency that at least of couple of suppliers can meet.
Remember the difference between nominal or average efficiency used in NEMA specs and minimum guaranteed efficiency.
RE: Premium Efficient VHS Motors
I am trying to get something from GE and US Motors,...
The motors to be nominal 3600RPM, 25Hp/3ph/60Hz/460V and each VFD/ATL started.
Dpc could you, please tell me more about:
"Remember the difference between nominal or average efficiency used in NEMA specs and minimum guaranteed efficiency."
Thanks a lot!
RE: Premium Efficient VHS Motors
Google search is a very useful tool.
http://www.cee1.org/ind/motrs/motrs-main.php3
RE: Premium Efficient VHS Motors
A "minimum guaranteed efficiency" is just that. The manuf. will warrant that for this particular motor, it will have an eff. of at least this amount. In actuality, it will probably be higher than this.
If you are specifying a required efficiency, you must be clear if this a nominal value per NEMA or a minimum guaranteed value. You should also specify a test method to be used as the basis for the efficiency. The motor standards differ on how efficiency is measured and calculated.
It's generally worthwhile to specifiy a high-efficiency motor, but just specifying "high-efficiency" doesn't really buy you anything - you have to be more specific.
RE: Premium Efficient VHS Motors