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salahuddin zia
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Join Date: Feb 2010
Posts: 164

Beraing temperatures.

02/15/2011 11:36 PM

Dear engineers

Can any one provide me with the data regarding pre-defined temperatures limits of bearing for 3 phase induction motors for insulation class A,E,B,F,H

Also let me know that the insulation classes used in electrical motors are their respective temperatures limits in accordance with IEC 34 standard are as follows class A (105 C),class E (120 C), class B (130 C).class F(155 C), class H(180 C).

What will be the temperatures limits for VFDs ?
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
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#1

Re: Beraing temperatures.

02/16/2011 12:29 AM

I don't recall ever seeing such data, and it may be hard to find. A reasonable assumption might be that bearing temp is 5-10°C less than insulation class temp (the bearings being nearer to ambient air than the motor windings).

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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2

Re: Beraing temperatures.

02/16/2011 12:42 AM

"Data regarding pre-defined temperatures limits of bearing for 3 phase induction motors" or any other bearing, would come from the bearing manufacturer, not the motor manufacturer.
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rakesh_semwal
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India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Oct 2006
Location: India, 200 Km. North of Delhi.
Posts: 1393
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#3

Re: Bearing temperatures.

02/16/2011 1:00 AM

Bearing temp limits can not be based on insulation class but will depend on the many factors such as what is the bearing types (for example sleeve or ball) what are the specified operating temp for bearings, what lubrication is used and so on-

For example if a sleeve bearing lubricated with silicone oil will have higher temp limit than of sleeve bearing with petroleum based oils.
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