permanent-magnet excitation

См. также в других словарях:

• permanent — adj. lasting, or intended to last or function, indefinitely (opp. TEMPORARY). Phrases and idioms: permanent magnet a magnet retaining its magnetic properties without continued excitation. Permanent Secretary (or Under secretary etc.) Brit. a… …   Useful english dictionary

• Excitation (magnetic) — An electric generator or electric motor that uses field coils rather than permanent magnets will require a current flow to be present in the field coils for the device to be able to work. If the field coils are not powered, the rotor in a… …   Wikipedia

• Excitation magnétique — Champ magnétique Vue d artiste de la magnétosphère terrestre …   Wikipédia en Français

• Self-excitation — is a method used by electrical generators to use some of the generator s output to generate the magnetic field used by the generator. Instead of having large permanent magnets, self excited generators have extra coils that either boost the… …   Wikipedia

• Electric motor — For other kinds of motors, see motor (disambiguation). For a railroad electric engine, see electric locomotive. Various electric motors. A 9 volt PP3 transistor battery is in the center foreground for size comparison. An electric motor converts… …   Wikipedia

• Electric generator — U.S. NRC image of a modern steam turbine generator In electricity generation, an electric generator is a device that converts mechanical energy to electrical energy. A generator forces electric charge (usually carried by electrons) to flow… …   Wikipedia

• Doubly fed electric machine — Doubly fed electric machines are electric motors or electric generators that have windings on both stationary and rotating parts, where both windings transfer significant power between shaft and electrical system. Doubly fed machines are useful… …   Wikipedia

• Magnetic field — This article is about a scientific description of the magnetic influence of an electric current or magnetic material. For the physics of magnetic materials, see magnetism. For information about objects that create magnetic fields, see magnet. For …   Wikipedia

• Electrical generator — In electricity generation, an electrical generator is a device that converts mechanical energy to electrical energy, generally using electromagnetic induction. The reverse conversion of electrical energy into mechanical energy is done by a motor …   Wikipedia

• Brushed DC electric motor — A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source. Contents 1 Simple two pole DC motor 2 The commutating plane 2.1 Compensation for stator field distortion …   Wikipedia

• Alternator — s are called turbo alternators.HistoryAlternating current generating systems were known in simple forms from the discovery of the magnetic induction of electric current. The early machines were developed by pioneers such as Michael Faraday and… …   Wikipedia