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Is it necessary to have a 30 sec interval between stopping and starting the motor ?


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#1 Guest__*

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Posted 17 August 2005 - 02:23 AM

Hi all;p;

"motor shall be designed for start-up immediately after shut down, following a minimum running time of 15 mins, on a continuous, repeating basis, without overheating or damage in an ambient air temperature of 250C for min. 2 hrs"



Is it necessary to have a 30 sec interval between stopping and starting the motor ?

#2 Murph095

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Posted 24 March 2006 - 09:14 PM

If thats from the vendor then i would recommend it.

#3 jraef

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Posted 24 March 2006 - 10:38 PM

Not if the motor is designed to do so more rapidly. Take thaat spec to a motor manufacturer and tell them you want a motor rated for this duty cycle. If they say they can't, move on because someone will take it on.
"He's not dead, he's just pinin' for the fjords!"

#4 jOmega

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Posted 30 March 2006 - 01:46 AM

The name of the game is......... get the heat out.

Force ventillation is one way .... but an ambient of 250C...?????

What class insulation?
Class H : 180C
Class N : 200C
Class ?

With Class H or even Class N, force-vent would be useless unless some means of cooling the air is provided; i.e. water cooled heat exchanger, or A/C, etc..

As jraef said.... a proper and experienced motor mfgr. should be able to design a product that would be able to meet the specs.
Question is how large is your budget ? It won't be inexpensive.

As to time between stop and re-start ... sufficient time to allow stored energy in winding inductance to dissipate to near zero before restart....is not unreasonable.

jΩ




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