An amplidyne is an electrodynamic amplifier invented during World War II by Ernst Alexanderson.It is an early form of servomechanism used to implement position feedback control for large motors. A small electrical signal can control the position of a large motor using this approach.

In its simplest form, an amplidyne follow-up system consists of:
* a synchro control transformer;
* an amplifier;
* the amplidyne motor-generator, which is similar to a Ward Leonard control drive;
* and the follow-up DC motor which drives the load to be positioned.

How it works

Chapter 10 of the U.S. Navy manual "Naval Ordnance and Gunnery, Volume 1" (1957) explains the operation of the amplidyne: : "The synchro control transformer receives the order signal which indicates electrically what the position of the load should be. The rotor of the synchro control transformer is turned by the response shaft, which is geared to the load and so indicates what the position of the load actually is. The synchro compares the actual load position with the ordered position; and, if the two do not agree, it generates an alternating-current signal which is transmitted to the amplifier. The angular difference between the two positions is called the error, and the signal to the amplifier is the error signal. The error signal indicates by its electrical characteristics the size and direction of the error. If no error exists, the system is said to be in correspondence and the error signal is zero." [ "Naval Ordnance and Gunnery, Volume 1", 1957, U.S. Navy Manual, Chapter 10.] ]


Amplidynes were initially used to point naval guns, and later, land artillery.

Later used to control processes in steelworks.Fact|date=December 2007

Used to remotely operate the control rods in early nuclear submarine designs (S3G Triton).Fact|date=December 2007


External links

* [ Adventures in Cybersound website]

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Look at other dictionaries:

  • amplidyne — ● amplidyne nom féminin Génératrice amplificatrice et régulatrice à courant continu …   Encyclopédie Universelle

  • Amplidyne —   [Kunstwort] die, / n, spezieller Gleichstromgenerator (eine Querfeldmaschine), der als Erregermaschine für Synchrongeneratoren oder als Verstärkermaschine für Regelungsaufgaben verwendet wird. * * * Am|pli|dy|ne, die; , n [zu lat. amplus = weit …   Universal-Lexikon

  • amplidyne — ☆ amplidyne [am′plə dīn΄ ] n. [ AMPLI(FIER) + DYNE] an amplifier that uses direct current and a rotating armature to generate a highly amplified output voltage that is sensitive to small changes in input voltage, used extensively to control… …   English World dictionary

  • amplidyne — /am pli duyn /, n. Elect. a direct current generator with a rotating armature, capable of magnifying a small amount of power supplied to the field winding of the device and using the amplified power to operate an attached, direct current motor.… …   Universalium

  • amplidyne — noun A form of electromechanical amplifier in which an AC motor drives a DC generator …   Wiktionary

  • Amplidyne — Am|pli|dy|ne die; , n <zu lat. amplius »weiter, stärker, noch mehr« u. gr. dýnamis »Kraft«> Querfeldverstärkermaschine, eine elektrische Gleichstrommaschine besonderer Bauart …   Das große Fremdwörterbuch

  • amplidyne — am·pli·dyne …   English syllables

  • amplidyne — am•pli•dyne [[t]ˈæm plɪˌdaɪn[/t]] n. elm a direct current generator with a rotating armature: used in servo systems as a power amplifier • Etymology: 1935–40 …   From formal English to slang

  • amplidyne — ˈampləˌdīn noun ( s) Etymology: amplifier + dyne (from Greek dynamis power) more at dynamic : a direct current generator that by the use of compensating coils and a short circuit across two of its brushes precisely controls a large power output… …   Useful english dictionary

  • AMPD — Amplidyne, Inc. (Business » NASDAQ Symbols) * Average Miles Driven Per Day (Governmental » Transportation) …   Abbreviations dictionary

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