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- since 1996 -
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Technical Discussions
Martynas
Lithuania, Joined Jul 2011, 6

Martynas

Lithuania,
Joined Jul 2011
6
15:24 Mar-20-2013
Technical question

Hello,

Is it possible to count prospective lifting power knowing that magnetic AC yoke lifting at least 9.2 kg at 115 V power line , when we use this equipment at 230 V voltage power line ?

Best regards,
Martynas

 
 Reply 
 
sadek997
NDT Inspector,
AR, Poland, Joined Feb 2011, 12

sadek997

NDT Inspector,
AR,
Poland,
Joined Feb 2011
12
22:37 Mar-20-2013
Re: Technical question
In Reply to Martynas at 15:24 Mar-20-2013 (Opening).

Dir Martynas
What is the purpose of counting the lifting force of the equipment setup that You've mentioned?

Yoke's lifting power is not only dependant on the magnet's voltage. There's also relationship on the element's material (magnetic properties), surface conditions (scale, rust, paint layers etc.), pole spacing, even material dimensions and poles conditions and so on. The american standard (ASTM E 709 TABLE 3) states that for yoke's the lifting force should be at least 45 N [10 lb]. European standards i.e. EN ISO 17638 or EN ISO 23278 does not even say a word about the lifting force requirement but states that - the required field intensity can be cheked/proved by other reliable methods.

Maybe You don't need (I may be wrong) to count the lifting force as the aforementioned AC magnet will meet Your criteria. Remember that the lifting force/field strength required for testing in european standards is to be proven by a magnetic field strength meter (lifting force only proves the info that the intensity is didn't change but dosn't state how high it is).
Regards

 
 Reply 
 
Frank Lund
R & D,
United Kingdom, Joined Apr 2005, 219

Frank Lund

R & D,
United Kingdom,
Joined Apr 2005
219
00:43 Mar-21-2013
Re: Technical question
In Reply to Martynas at 15:24 Mar-20-2013 (Opening).

Is your electromagnet rated for operation at 230V?

You will be taking the core nearer to saturation, hence reducing the inductance. The degree to which this will happen dpends upon the material, the magnetic circuit and the the flux density at design conditions.

You can expect to, at least, double the current through the magnet. With doubling the voltage, you're doubling the power and quadrupling the heat that must be dissipated.

 
 Reply 
 
andrew cunningham
NDT Inspector
Canada, Joined Jun 2008, 238

andrew cunningham

NDT Inspector
Canada,
Joined Jun 2008
238
01:04 Mar-21-2013
Re: Technical question
In Reply to Martynas at 15:24 Mar-20-2013 (Opening).

If you plug a 110 volt yoke into a 220 volt supply. It will burn out. Only use the correct voltage for what the yoke was designed

 
 Reply 
 
Martynas
Lithuania, Joined Jul 2011, 6

Martynas

Lithuania,
Joined Jul 2011
6
09:18 Mar-21-2013
Re: Technical question
In Reply to Frank Lund at 00:43 Mar-21-2013 .

Thanks guys for the answers,

Few details: Yoke is rated for operation at 230V. Just manufacturer is in Canada so they state lifting power at 110 V.

I need to know that because my company is participating in tender where one of requirement is that Yoke must generate 110 N lifting power, So as i understood it should be OK.

Best regards,
Martynas

 
 Reply 
 

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