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The average travel time to
work in the United States is
25.4 minutes, according to
the U.S. Census Bureau. This
number is probably low if you factor in
a traffic accident in New York City, light
rain in Chicago or it's simply Tuesday
in Los Angeles. It's safe to say 25.4
turns into 45 minutes in many areas
of the country at seven o'clock in the
morning.
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.