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 amplidynr step is to short the brushes together, as amplodyne in figure The decrease in the effect of FC reduces FS and consequently reduces the voltage across the new brushes. If the 3 volts applied to the field winding is considered an input, and the volts taken from the brushes is an output, there is a gain of This field may be adjusted to balance out FA and thus restore the full effect of the exciting field FC.

The master switch is a start-stop push button used to start and stop the amplidyne motor-generator. It consists of an electric motor driving a DC generator. The principal parts of a generator are the stator, or stationary part, and the ampliidyne, or rotating part. Timeline of the electric motor Ball bearing motor Barlow’s wheel Lynch motor Mendocino motor Mouse mill motor.

As a result, the motor am;lidyne the load in the proper direction to reduce the error. 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.

Early World War II era gun tracking and radar systems used this approach.

The connections to the commutators are such that the maximum voltage appears across two points on opposite sides of the commutator. As previously stated, an amplidyne is used to provide large dc currents.

Identical synchros are used, but they are geared at AC motor DC motor.

Amplidyne – Wikipedia

The voltage at the output will be the same as in the original generator, volts in our example. This current produces the same armature reaction FS as before. The power output of the amplidyne is then much less than when the speed is increasing or decreasing, and the error will be correspondingly smaller.


The gun tracking and radar systems that were used during World War II made use of this approach, and the GE Amplidyne motor generator was one such machine. As a result, voltages are induced in the armature coils.

Full-load output has been obtained with only 1-watt excitation instead of In figure 10D2the upper view represents an ordinary direct-current generator such as the one just described. When the source of the input voltage senses the correct movement of the object, it drops the voltage to zero. In a typical generator the load brushes are positioned perpendicular to the magnetic field flux. So the output voltage of the generator is an amplified copy of the current waveform applied to the field winding.

Coilgun Railgun Superconducting machine.

The GE Amplidyne to Volt Motor Generator

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. For instance, in a normal dc generator, a small dc voltage applied to the field windings is able to control the output of the generator.

Circuit Globe Special Machines Amplidyne. In the normal operation of following an order signal, an increased error indicates that the order signal has suddenly picked up wmplidyne and that increased power is required to bring the load quickly to the higher speed. The indicator-regulator amplidne the synchro control transformer and the indicator dials. The gain of the original generator has been greatly increased.

The amplidyne generator is a power amplifier on a large scale. This removes nearly all of the resistance maplidyne the armature circuit. It has about the same strength as the field FC.

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 smplidyne power.

It consists of the basic metadyne in which a compensating winding is connected in series with the power output brush terminals. The output brushes are in line with the armature flux. Navy Manual, Chapter The direction of rotation of the motor depends on the polarity of the output of the amplidyne generator, which in amplifyne depends on the direction of the error as indicated by the error signal.


By balancing the control currents, the amplidyne output is brought to zero and the motor stands still. 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.

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 compensating winding is located in the direct d axis on the stator.

When the error signal is zero, the two control currents should be equal.

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 amplldyne the amplidyne generator to turn the gun mount motor. If the order signal suddenly slows down, the load may overrun the signal and reverse the direction of the error.

Chapter 10 of the U. As you have seen, the original generator produced a 10,watt output with a watt input. These currents are amplified in the second stage to provide the control-field currents for the amplidyne generator. This second magnetic field, called armature reaction, does no useful work in the ordinary generator and is, in fact, a source of trouble.

The d axis flux now depends on the field winding current. Most of its applications were in the field of feedback control systems, and it was used primarily as a voltage regulator.

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 difference between the two control currents determines the amount of power supplied to the motor. 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.