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If you’re an electrical engineer
you know how an electric motor works; if
you aren’t, it can be extremely
confusing. Therefore, here’s the simplified explanation (or the “how
an electric motor works for dummies” version) of how a four-pole, three-phase
AC induction motor works in a car.
I was invited by Tom Astrene of TLT to write a response to the
July 2010 TLT article (Ref. 1). My rebuttal — “In Search of a Fatigue
Limit: A Critique of ISO Standard 281:2007” — was published
in Tribology and Lubrication Engineering, TLT, August
2010 edition (Ref. 10). While this article is also available online,
I will attempt to summarize the essence of my response.
When the need arises for linear motion
or positioning, there are many choices.
One can use an Acme screw, ball screw,
rack & pinion, or belts. The cost of a linear motor solution is generally greater than a mechanical linear product, but when one needs highly accurate, repeatable, high-speed motion, then the answer may be a linear motor.
Equipment downtime and reduced component
life are a few of the consequences — and
potential costs — of using the wrong seals on many types of industrial equipment including pump bearing frames, electric motors, fans, pillow blocks, gearboxes and more. However, if
correctly specified and installed, seals provide effective barriers that both retain lubricants as well as protect against water, corrosion, debris and other contaminants.
Eddy Swiben, branch manager at BDI
Canada, explains how to problem solve
on an automatic cutter for tissue rolls.
“This is a very major paper tissue manufacturer that sells paper tissue rolls all over America.” They roll paper tissue just like newsprint paper mills do. When the product is finally done and dried, they need to roll it on a light carton core 20-ft. long.
Bearings are an essential component
in the majority of mechanical
designs and equipment.
It is important to consider the
most effective materials when designing
industrial machinery, especially in
applications where water or other liquids
are present. Many materials will
be unable to overcome the challenges
associated with operating in a wet or
corrosive environment.