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Let’s take a trip through time, back to August 29, 1831, arriving at Michael Faraday’s workshop. The great scientist and father of electrical engineering has just discovered that a copper disk, spinning within a horseshoe magnet, generates electricity in a wire. This “induction” is fundamental to all electro-technology that will follow. Mr. Faraday has created the first-ever generator.
We approach Mr. Faraday and ask the question, “Sir, do you think
that one day your discovery will be capable of positioning
nine-micron-thick optical fibers, end-to-end, at acceleration rates of
ten meters per second, at resolutions measured consistently in
nanometers?” We can only guess what his reply might have been.
However, the linear motors of today, which are capable of
breathtaking speeds and accuracies, are founded on the same basic
principles that Faraday discovered. It is by examining these principles,
together with some practical hints and formulae, that we will remove
any mystery about the construction and application of direct-drive