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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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