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DescriptionDiagram of single-phase generator with four poles.svg
English: Diagram of revolving-field single phase generator with four poles. As the rotor turns, the lines of force at fours poles are cut by the coils inducing current. The output from four coils are "in phase". The direction of current changes to the opposite side every 90 degrees of the rotation.
This is a derived work of a public domain image published in 2008 in the Aviation Maintenance Technician Handbook—General (FAA-H-8083-30) by United States Federal Aviation Administration on page 10-161 (Figure 10-303).
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