Sizing matters
July 1st 2008 Industry figures suggest around
80% of pump motors could be the
incorrect size, comments Andrew
Glover, product manager for WEG
Motors. He believes most are overspecified
by 10 or 15% by
engineers wanting to be 'on the
safe side', resulting
in a serious loss of
energy.
He adds that
under-sizing is also
relatively common
and can result in the
motor running hotter,
leading to damage
through overheating.
Specification of
motor size, says
Weg, should include starting
condition and method of starting
as well as running torque.
The company says that including
a variable speed drive or soft
starter in the specification,
matched to the requirements of
motor and pump, will provide a
solution. VSDs improve energy
efficiency in the long term by
matching application requirements
with correct motor speed, thereby
avoiding energy wastage. More articles from WEG Electric Motors (UK) Ltd: | 
