Motor Frame Size

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ganeshakce-electrical Commentator Join Date: Jun 2008 Location: Tamilnadu,india Posts: 64	Motor Frame Size 04/27/2011 8:37 AM
	Dear all, for the motor frame size i have choosed as per IEC/IS standard.in that Small,medium,large mentioned with frame number. my question is what is the difference between s,m & L.and if we choose one size higher than standard frame what will be advantage. is there any relationship with frame size & Motor efficiency.kindly advise me. regards, N.Ganesan. __________________ Knowledge Sharing
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ozzb Guru Join Date: Mar 2007 Location: Rosedale, Maryland USA Posts: 5197 Good Answers: 266	#1 Re: Motor Frame Size 04/27/2011 9:18 AM
	Generally S,M,L denotes the general length of the motor. http://www.aps-systems.ch/en/Baugroessen.htm Motor length is sometimes changed as necessary to accommodate changes in wiring for motor RPM. That keeps frame size the same. __________________ Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#2 Re: Motor Frame Size 04/27/2011 11:21 AM
	S, M & L in motor frame size designation stand for SMALL, MEDIUM & LARGE. It relates to the core length of the motor. Yes! Definitely there will be variation in efficiency. Taking lead from one of your othet posts, let us take the exampe of a 11kW Motor. As per IS 12615, 11kW, 3000 RPM motor - Frame Size 160M; eff1 - 90.5% 11kW, 1500 RPM motor - Frame Size 160M; eff1 - 91.0% 11kW, 1000 RPM motor - Frame Size 160L; eff1 - 89.7% 11kW, 750 RPM motor - Frame Size 180L; eff1 - 88.1% As you can see, between 160M & 160L, there is a marked difference in efficiency. Longer the frame, lesser will be the efficiency. Understandable, as longer the core, the core area & hence the core losses will be more; hence, efficiency will be lesser.
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Joe Sparky Power-User Join Date: Jun 2009 Location: New Zealand Posts: 403 Good Answers: 5	#4 In reply to #2 Re: Motor Frame Size 04/28/2011 4:22 AM
	Hi Electricalexpert65, you get a GA from me, I have never bothered to look at the variations of frame size as to efficiency, but thanks for the in-site. Cheers Joe
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jashobanta Participant Join Date: Apr 2011 Posts: 1	#3 Re: Motor Frame Size 04/28/2011 2:55 AM
	The difference between S, M, L is the distance between the foot holes. Frame size having S has smaller distance between DE to NDE foot holes where as L has the largest distance between them. There is absolutely no relationship between frame size and efficiency. -Regards ROUT
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