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Advantages of Closed Slot Stamping vs Open Slot Stamping

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Advantages of Closed Slot Stamping vs Open Slot Stamping

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Hi Guys,
Recently i came across an information that some manufacturers of Submersible Motors use Closed slot Stamping design in Higher kW ranges over the conventional Open slot stampings. The disadvantage of a closed slot stamping will be the delay in production as it may take upto couple of days to completly sew the coil on its core.
I wonder what could be the advantage of the Closed Slot stamping motor over the one with conventional Open Slot Stamping? Can anyone throw me some light on this issue.
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