NettoWirkleistung

NettoWirkleistung is a term used in elektrotechnik to describe the portion of the input real power that is available as usable output after internal losses are subtracted. It represents the real power that actually flows to the external load or, in rotating machines, to the output shaft. In contrast to the gross or input real power, the nettoWirkleistung reflects what can be considered the “net” deliverable power of a device.

In electrical machines, nettoWirkleistung equals the output power after losses such as copper losses in windings, iron (core) losses, mechanical losses (friction, windage), and stray losses have been accounted for. Therefore, P_net is related to the input real power P_in by P_net = P_in − P_losses. The overall efficiency η of a device is η = P_net / P_in. For three-phase systems, P_in can be expressed as P_in = √3 V_L I_L cosφ, with cosφ being the displacement power factor; P_net is the useful mechanical or electrical output power.

The concept is common in datasheets, motor and generator specifications, and power electronics where a distinction is made between the power consumed by a device and the power delivered to the useful load. NettoWirkleistung is often treated as the usable or useful real power, whereas the term Wirkleistung denotes the general real power transferred, possibly before losses are subtracted. In practice, engineers use nettoWirkleistung to assess performance, efficiency, and suitability for a given application.

See also: Wirkleistung, Scheinleistung, Blindleistung, Wirkgrad, Nennleistung.