AMPLIDYNE PDF

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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The excitation current produces a magnetic field whose direction is indicated by the ampldyne FC. This represents a gain of 10, The strength of the control-field current from the amplifier depends on the size of the error as indicated by the error signal.

It has about the same strength as the field FC.

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.

Electronic amplifiers Obsolete technologies. 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. All articles with unsourced statements Articles with unsourced statements from July Articles with unsourced statements from December The basic concept of this motor-generator is that it makes use of regeneration to enhance its gain.

Amplidynes are special-purpose dc generators. Qmplidyne following the usual gun-train or gun-elevation order, the errors amplldyne not be more than a few minutes of arc under the most adverse conditions. Its power output depends on the strength of its control-field current but is several thousand times greater. The Amplidyne Motor Generator is a special purpose motor generator that supplies precisely controlled DC current to large sized DC motors that are used for driving heavy loads like missile launchers and gun turrets.

The power output of the amplidyne is then much maplidyne than when the speed is increasing or decreasing, and the error will be correspondingly smaller.

When the source of the input voltage senses the correct movement of the object, it drops the voltage to zero. The d axis flux now depends on the field winding current. The next step is to add another set of brushes.

Reasonably sized vacuum tubes were amplidyje able to deliver sufficient power to control large sized motors, but vacuum tube circuits that drove the input of amplidynes could be utilized to enhance small signals higher up to the power required to drive large motors. The amplidyne was first used in the US Navy in amplodyne systems to control the electric motors rotating naval gun mounts, to qmplidyne the gun at a target.

This second magnetic field, called armature reaction, does no useful work in the ordinary generator and is, in fact, a source of trouble. Timeline of the electric motor Ball bearing motor Barlow’s wheel Lynch motor Mendocino motor Mouse mill motor.

The synchro compares the actual load position with the ordered position; and, if the two do not agree, it generates an alternating-current signal amllidyne is transmitted to the amplifier. In effect, watts controls 10, watts. Vacuum tubes could offer higher power levels, but the lack of planned obsolescence was the primary reason behind their lack of evolution.

The GE Amplidyne to Volt Motor Generator

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.

The Initial Replacement for Vacuum Tubes A few decades back, amplidynes were one of the first few amplifiers to produce an extremely high power in the range of tens of kilowatts, giving way for accurate feedback control of heavy machines. In the next view, new brushes have been added to points 90 degrees from the original brushes, and the original load of 1 ohm has been connected between them. The difference between the two control currents determines the amount of power supplied to the motor.

The following changes, for explanation purposes, will convert the typical dc generator above into an amplidyne. In the initial period, amplidynes were used for moving sidewalks, electric elevators, anti-aircraft artillery radar, and to point naval guns.

What is an Amplidyne? – Circuit Globe

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 armature reaction FS induces a voltage in the armature in the same manner as flux FC but this voltage appears on the commutator at 90 degrees from the voltage induced by FC.

The reason for this is that current flowing in the armature coils between these brushes has created a second armature reaction FA which opposes the exciting field FC and reduces its effect. In the normal operation of following an order signal, an increased error indicates that the order signal has suddenly picked up speed and that increased power is required to bring the load quickly to the higher speed. This current produces the same armature reaction FS as before.

If no error exists, the system is said to be in correspondence and the error signal is zero. 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 qmplidyne. They were also used amplidyns diesel electric locomotive control systems. The amplidyne generator supplies direct current to operate the follow-up motor.

If now the brushes are short-circuited, as shown in the second view, an immense armature current will flow unless the excitation is reduced. 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. How do they Work?

The selector switch has four positions: These now become the output brushes of the amplidyne. Amplidynes were initially used for electric elevators and to point naval gunsand antiaircraft artillery radar such as SCR in In the equipment now in use, excitation is supplied to two control windings which are oppositely wound. A few decades back, amplidynes were one of the first few amplifiers to produce an extremely high power in the range of tens of kilowatts, giving way for accurate feedback control of heavy machines.