Amplidyne definition, a direct-current generator with a rotating armature, capable of magnifying a small amount of power supplied to the field winding of the. 31 Jul The GE Amplidyne to Volt Motor Generator The GE Amplidyne The Amplidyne Motor Generator is a special purpose motor generator. 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.
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At the same time, the amp load current flowing in the armature coils creates another magnetic field FS at right angles to FC. Navy manual Naval Ordnance and Gunnery, Volume 1 explains the operation of the amplidyne: Considering the case of a typical generator, the load brushes are situated perpendicular to the magnetic field flux.
This current produces the same armature reaction FS as before. Thus, the direction of rotation of the follow-up motor, which receives its power supply from the amplidyne generator, can be controlled at will anplidyne supplying the stronger current to one or the other of the control am;lidyne.
It consists of an AC motor that drives a DC generator with some alterations to enhance the available power gain. Doubly-fed Linear Servomotor Stepper Traction. The direction of rotation of the motor depends on the polarity of the output of the amplidyne generator, which in turn depends on the direction of the error as indicated by the error signal. The degree of compensation C is defined as the ratio of effective compensating winding turns to the effective armature turns.
It consists of the basic metadyne in which a compensating winding is connected in series with the power output brush terminals. Amplifier The function of the amplifier is to supply two control-field currents for the amplidyne generator. The perpendicular brushes are now called the ‘quadrature’ brushes.
A phase-sensitive demodulator, with the synchro AC power as its reference, created the DC error signal of the required polarity. In short, watts control 10, watts of output, and this is how an amplidyne works in simple terms.
However, today MOSFETs can produce even high power gains of as high as 1, and IGBT are also capable of achieving power gains in the range ofwhich is why you don’t get to see ampkidyne in action anymore. When the mount is to move in the opposite direction, the unbalance in the control currents must smplidyne reversed. 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.
Circuit Globe All about Electrical and Electronics. The amplidyne produces the same 10,watt output with only a 1-watt input. Later on, they were applicable for controlling processes in steelworks. Coilgun Railgun Superconducting machine. Circuit Globe Special Machines Amplidyne.
The armature current from the new brushes has been taken through a compensating field winding and creates a magnetic field FB opposed to FA.
The direction of the magnetic field FC and the polarity of the output of the generator depend upon which winding receives the stronger current. The next step is to add another set of brushes. 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.
They were used to supply DC power to process control motors, excitation systems of large AC generators and Ward Leonard speed control systems. The amplidyne generator is a power amplifier on a large scale.
As a result, voltages are induced in the armature coils. The voltages induced in the coils are taken off by stationary carbon brushes engaging the commutator as it turns. From Wikipedia, the free encyclopedia.
Amplidyne | Revolvy
The previously shorted brushes are now called the “quadrature” brushes. This means that the 3 volts output is times larger than the input. Assume that a very large turning force is required to rotate a heavy object, such as an antenna, to a very precise position. The effect of degree of compensation on the load characteristic of a cross field machine is shown below. The amplifier receives the alternating-current error signal, amplifies it, and converts it into direct current suitable to energize the field windings of the amplidyne generator.
The smaller control field now requires a control voltage of only 1 volt and an input power of 1 watt 1 volt across 1 ohm causes 1 ampere of current, which produces 1 watt of input power. 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
All articles with unsourced statements Articles with unsourced statements from July Articles with unsourced statements from December Vacuum tubes of 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.
This generator is assumed to be a kw machine 10, watts outputand the excitation required is about watts. In the above case of the GE Amplidyne to Volt Motor Generator, the characteristics of the generator facilitate generating around 87 ampere of armature current at volts at the terminals for output; the values range accordingly for variations up to volts. The decrease in the effect of FC reduces FS and consequently reduces the voltage across the new brushes. When the source of the input voltage senses the correct movement of the object, it drops the voltage to zero.
The first stage is primarily a rectifier stage in which two direct currents are produced whose magnitudes are controlled by the error signal. 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. They were also used in diesel electric locomotive control systems.
AC motor DC motor. The synchro control transformer receives the order signal which indicates electrically what the position of the load should be. In a typical generator, a change in voltage from 0-volt dc to 3-volts dc applied to the field winding may cause the generator output to vary from 0-volt dc to volts dc. So the output voltage of the generator is an amplified copy of the current waveform applied to the field winding.