permanent magnet material
71Elektrisches Betriebsmittel — Unter einem elektrischen Betriebsmittel versteht man ein Bauteil, eine Baugruppe oder ein Gerät einer elektrischen Anlage. In industriellen Anlagen werden elektrische Betriebsmittel üblicherweise mit sogenannten Betriebsmittelkennzeichen (BMK)… …
72electromechanical transducer — ▪ instrument Introduction any type of device that either converts an electrical signal into sound waves (as in a loudspeaker) or converts a sound wave into an electrical signal (as in the microphone). Many of the transducers used in… …
73Voice coil — A voice coil (consisting of a bobbin, collar and winding) is the coil of wire attached to the apex of the cone of a loudspeaker. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. The… …
74Headphones — For other uses, see Headphones (disambiguation). Sennheiser HD555 headphones, used in audio production environments …
75Pickup (music technology) — For phonograph pickup, see Magnetic cartridge. For other uses, see Pickup disambiguation page. Three magnetic pickups on a Peavey Raptor with the pickup configuration of a fat strat (H S S). The bridge (right) pickup is a humbucker and the neck… …
76Earnshaw's theorem — states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges. This was first proven by Samuel Earnshaw in 1842. It is usually referenced to… …
77Restriction of Hazardous Substances Directive — European Union directive: Directive 2002/95/EC Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment Made by Council Parliament …
78Seltenerdmagnet — Unter dem Namen Seltenerdmagneten (auch Seltene Erden Magnete) fasst man eine Gruppe von Permanentmagneten zusammen, deren wesentliche Bestandteile Eisenmetalle (Eisen, Cobalt, seltener Nickel) und Seltenerdmetalle (insbesondere Neodym, Samarium …
79nickel processing — Introduction preparation of the metal for use in various products. Although it is best known for its use in coinage, nickel (Ni) has become much more important for its many industrial applications, which owe their importance to a… …
80Commutator (electric) — This article is about the electrical component. For mathematical concept, see Commutator . A tiny 5 segment commutator less than 2 mm in diameter, on a direct current motor in a toy radio control ZipZaps car. A commutator is a rotary electri …
