Praetor wrote:

I'm pretty sure Rick Sternbach has stated that the real-world reason Voyager had moving warp nacelles is that the producers wanted the ship to have visual interest and so wanted something on it to move, so he came up with the idea of variable warp geometry and the idea that they would indeed move tiny amounts while the ship was in warp.
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The variable warp geometry was only one of maybe five different things that were proposed. The producers simply had this frustrating habit of wanting to see lots of other bits even after the first, most obvious solution shone brightly. A close cousin of the moving pylons was a long door on the nacelle that would expose the coils to space, but the doors ended up looking like drag brakes, so I didn't pursue them with much interest.
Rick
www.spacemodelsystems.com