email@example.com (Gaurav) wrote in message
Typically iron castings are used unless there is a good reason for
something else. Just look at the web site of a major manufacturer, for
"Automotive approved motors are available in both Standard High
Efficiency, our Standard-E, and Premium Efficiency, our Super-E,
designs. The Standard High Efficiency motors meet efficiency times
power factor requirements of GM7EQ. The Premium Efficiency motors meet
the efficiency times power factor of GM7EHQ. Available from stock in
ratings from 1 HP to 100 HP. These cast iron motors meet automotive
requirements for sound power levels."
"Washdown Duty Motors are available from stock in single and three
phase AC and in DC designs. Horsepowers range from 1/2 to 20. Designs
include motors having an electostatically applied epoxy finish, paint
free with major components in 300 series stainless steel, and all
stainless steel. Applications include food processing, packaging,
pharmaceuticals, or applications where motors are regularly exposed to
high pressure wash down."
Where weight and corrosion is important I have also run into a few aluminium
While castings dominate high production volume motors, larger low volume
motor casings are sometimes fabricated by welding.
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