Faseomløp

Faseomløp is a term used in Danish and Norwegian to describe the progression or rotation of phase in periodic phenomena. The exact meaning depends on context, but two common usages are in electrical engineering and in celestial mechanics.

In electrical engineering, faseomløp often refers to the phase rotation, or phase sequence, of a three‑phase power system—the order in which the three sinusoidal voltages reach their maxima. Common sequences are ABC or ACB. Maintaining the correct faseomløp is essential for proper operation of three‑phase motors and generators; an incorrect sequence can cause motors to run in reverse, experience incorrect torque, or excessive heating. Phase rotation is determined by the wiring between source and load and can be checked with a phase‑rotation meter or by testing a connected motor during startup. Ratings specify the required sequence.

In astronomy and orbital mechanics, faseomløp can denote the orbital phase: the position of an object in its orbit relative to a reference point, expressed as a fraction of the period or as an angle. Knowing the phase helps relate periodic signals, such as light curves or eclipses, to the body's trajectory and is used in modeling interactions between orbiting bodies. The term may also appear in studies of tidal evolution and other dynamics where phase relations influence outcomes.