The warp field generator, or space warp generator, was a component of the warp drive aboard starships.
The Phoenix, Humanity's first warp capable ship, had two warp field generator displays. (Star Trek: First Contact)
When Leah Brahms came aboard the USS Enterprise-D in 2367, she criticized Geordi La Forge for the magnetic plasma transfer to the warp field generators not corresponding to the recommended specs, since he had adjusted the flow. (TNG: "Galaxy's Child")