An Amplidyne is a rotating amplifier. It is a prime-mover-driven d.c. generator whose output power can be controlled by a small field power input. An amplidyne is. The amplidyne generator is a power amplifier on a large scale. Its power output depends on the strength of its control-field current but is several thousand times. Amplidynes are special-purpose dc generators. They supply large dc.

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It consists of an electric motor driving a DC generator.

Amplidyne | Revolvy

The signal to be amplified is applied to the generator’s field windingand its output voltage is an amplified copy of the field current. The amplidyne is used in industry in high power servo and control systems, to amplify low power control signals to control powerful electric motorsfor example.

It is now mostly obsolete. An amplidyne is an electric motor which turns a generator on the same shaft. Unlike an ordinary motor-generatorthe purpose of an amplidyne is not to generate a steady voltage but to generate a voltage proportional to an input current, to amplify the input. The motor provides the power, turning the generator at a constant speed, and ampoidyne signal to be amplified is applied to the generator’s field winding.

The amplidyn the current applied to the winding, the stronger the magnetic field and thus the higher the output voltage of the generator.

So the output voltage of the generator is an amplified copy of the current waveform applied to the field xmplidyne. In a typical generator the load brushes are positioned perpendicular to the magnetic field flux. To convert a generator to an amplidyne, what would normally be the load brushes are connected together and the output is taken from another set of brushes that are parallel with the field. The perpendicular brushes are now called the ‘quadrature’ brushes. This simple change can increase the gain by a factor of 10, or more.


The amplidyne’s frequency response is limited to low frequencies, it cannot even handle audio frequencies, so its use is limited to amplifying low frequency control signals in industrial processes.

Historically, amplidynes were one of the first amplifiers to generate very high power tens of kilowattsallowing precise feedback control of heavy machinery. Vacuum tubes amplldyne reasonable size were unable to deliver enough power to control large motors, but vacuum tube circuits driving the input of an amplidyne could be used to boost small signals up to the power needed to drive large motors. Early World War II era gun tracking and radar systems used this approach.

The amplidyne was first used in the US Navy in servo systems to control the electric motors rotating naval gun mounts, to aim the gun at a target.

The GE Amplidyne to Volt Motor Generator

The system diagram right is a feedback control system in which a feedback signal from a sensor representing the current position of the gun is compared with the control signal which represents the desired position, and the difference is amplified by the amplidyne generator to turn the gun mount motor.


Chapter 10 of the U. Navy manual Naval Ordnance and Gunnery, Volume 1 explains the operation of the amplidyne: Specifically, the phase of the control transformer’s output in phase with the synchro power source, or opposite phase provided the polarity of the error signal. A phase-sensitive demodulator, with the synchro AC power as its reference, created the DC error signal of the required polarity.

Amplidynes were initially used for electric elevators and to point naval gunsand antiaircraft artillery radar such as SCR in Used to remotely operate the control rods in early nuclear submarine designs S3G Triton.

The Amplidyne (General Electric Company)

Diesel-electric locomotive control systems. Early ALCO road-switcher locomotives used this technology. From Wikipedia, the free encyclopedia. Navy Manual, Chapter AC motor DC motor.

AC asynchronous induction IM. Doubly-fed Linear Servomotor Stepper Traction. Timeline of the electric motor Ball bearing motor Barlow’s wheel Lynch motor Mendocino motor Mouse mill motor. Coilgun Railgun Superconducting machine. Alternator Electric generator Inchworm motor. Retrieved from ” https: Electronic amplifiers Obsolete technologies. All articles with unsourced statements Articles with unsourced statements from July Articles with unsourced statements from December Views Read Edit Amplidyen history.

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