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Working with large motor frames: Special care in handling required to avoid damage

  • August 2009
  • Number of views: 11456
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Chuck Yung 
EASA Technical Support Specialist 

Due to economies of scale, the use of cast iron is a popular choice in the manufacturing of NEMA and IEC frames. Cast iron is robust and easily machined. It is dimensionally stable and transfers heat well. However, foundry work is an energy-intense process, not well-suited to limited production runs. 

For larger electric motors, which are manufactured in smaller quanti­ties, the frame is more often fabri­cated from steel. You may have heard various nicknames for this type of construction: “shoe-box,” “skeleton frame,” “bathtubs” or other terms. Those who work on these motors regularly know that the frame requires care in handling, especially those fit­ted with sleeve bearings. 

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 1: General
  • Section 2: Mechanical repair
  • Section 4: Testing

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 4: Safety & Handling Considerations

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 4: Safety & Handling Considerations

Tags: Motor enclosures
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