The magnetic amplifier is an electromagnetic device for amplifying electrical signals 2. Administration military personnel skills, procedures, duties, etc advancement military career advancement books, etc. Factors which affect how an amplifier performs, such as impedance, feedback frequency response, and coupling, are also explained. Use of the single core magnetic amplifier in a magnetic timer circuit. The 50 kw alternator was commandeered by the us navy and put into service in. Different types of amplifiers are used for electronic amplification. A small amount of dc current change from the 9 volt battery and a 1k pot can cause a large.
Us navy interior communications electrician rate training manuals. Modeling of a threephase application of a magnetic amplifier. Technology enhancements in the field of magnetic materials have given the designer many choices while at the same time. Electronics engineers of the 1950s believed the rugged little magnetic amplifier was going to replace the fragile vacuum tube. The mag amp, like the vacuum tube and transistor, is an electrical control valve.
For a fair comparison the plate supply of both amplifiers must be a. Submitted in partial fulfillment of the requirements for the degree of. Transformers pdf the basic magnetic amplifier has a transformerlike construction with two coupled ac power outputs and a dc control input applied to the separate winding. Simplicity the mag amp, like the vacuum tube and transistor, is an electrical control valve. Due to wound of the two halves of the output winding the direction of magnetic flux created by these two halves in center leg is same as direction of control. Drain d, through which the carriers leave the channel. Navy electricity and electronics training series neets, 1998.
This book is about magnetic amplifiers, which use the nonlinear saturation characteristics of a core to create an amplifier. Since this curve almost duplicates that of cer tain type tubes, operating characteristics of both can be plotted on the same curve. In combination with a projectile intendeded for rapid movement through the air, and adapted for detonation within a predetermined proximity to a target, a source of power for setting up substantially steady or constant magnetic flux lines about said projectile, said flux lines adapted to induce eddy currents in said target, an amplifier circuit. While serving as lieutenant, he attended various naval training schools in sonar and radar, later being assigned duty as naval representative to the national defense research committee, operating under the. Complete patent searching database and patent data analytics services. Magnetic amplifier an overview sciencedirect topics. A magnetic amplifier is a circuit that uses changes in core saturation of an inductor to bring about amplification. Comparisons between electron tube amplifiers and magnetic amplifiers are made, and a number of basic circuits are shown. Magnetic amplifier project gutenberg selfpublishing. Modeling of a threephase application of a magnetic amplifier author. Rectifying installation comprising blockinglayer cells. Electronics engineers of the 1950s believed the rugged little magnetic amplifier was going to replace the less reliable vacuum tube in all its functions up to a megacycle.
Navy through the bureau of naval personnel navpers for short. Relatively modern basic electricity and electronics classes. Magnetic amplifiers, paul mali, 1960, 101 pages thanks to keith carlsen. They contain a wide variety of technical information, and date back as far as world war ii. Amplifiers introduction amplifiers are used extensively in electronic circuits to make an electronic signal bigger without affecting it in any other way. A magnetic amplifier comprising in combination a pair of magnetic cores, each core having wound thereon a primary, secondary, bias and compensating. Module 24, introduction to fiber optics, is an introduction to fiber optics. The amplidyne was used in industry in high power servo and control systems, to amplify low power. The most importan component t o f a magnetic amplifier. A modeling approach of a magnetic amplifier based on the magnetic hysteresis of the core material is presented here for a common amorphous magnetic alloy.
Much of the howitworks above is from magnetic amplifiers by the us. Application of magnetic amplifiers to electronic computers. Topic 2 discusses video amplifiers and radio frequency amplifiers. Aviation support equipment technician page navigation 348 349 350 351 352 353 354 355 356 357 358. Compra tu kindle aqui, or download a free kindle reading app. Module 23, magnetic recording, is an introduction to the use and maintenance of magnetic recorders and the concepts of recording on magnetic tape and disks. The basis of a magnetic amplifier circuit is formed by a nonlinear transformer, that is, a transformer having a core of ferromagnetic material and being operated in.
Magnetic amplifiers how they work and what they do pdf. Amplifiers abstract direct current controlled transdii known c tors, no w as magneti amplifiers,werc use successfullde y b germany the s in th 1939194e war fo5 r the amplificatio mixin on angf d. Integrated publishing your source for military specifications and educational publications. The magnetic amplifier was invented early in the 20th century, and was used as an alternative to vacuum tube amplifiers where robustness and high current capacity were required. Magnetic amplifiers are used in the power supply of the electronic flight control system in the swedish gripen fighteraircraft. The magnetic amplifier is not new the principles of the saturable core control were used in electrical machinery as early as 1885 although they were. Generally we think of amplifiers as audio amplifiers in the radios, cd players and stereos we use around the home. Full wave magnetic amplifier it is almost similar to the above half wave amplifier circuit, but it utilizes both half cycles of the ac supply, hence it is termed as a full wave circuit. While magnetic amplifiers can be designed for ratings from a fraction of a watt up to 100 kw or more they are now facing increasing competition from the transistor and the siliconcontrolled rectifier or thyristor. Gate g, the terminal that modulates the channel conductivity. Upon declaration of war in 1942 he was transferred from the u. Navy 1951 the bibliography is published separately by high voltage press.
The zealous authors of magnetic amplifiers appended this exhaustive 500entry compendium, which lends itself to separate publication. A coil fed with a variable dc current is wound around a magnetic core which also carries a winding from the ac output of the transformer. The constants which describe the reactor characteristics are obtained from a constant current switching characteristic of the type used for describing reactors in the digitalcomputer field. Magnetic amplifiers bibliography information unlimited. An inline pre amplifier astc can be placed on the end of the provided length which would allow longer length after the inline pre amplifier. They were used to supply dc energy to handle control engines, major ac generators and ward leonard speed control systems. It consists of an iron core with two or more coils wound around it. Vacuum tubes arent the only way to make an amplifier. General specificationsappendix 10, 1936 describes the nomenclature of decks, numbering of watertight compartments and labeling used aboard vessels of the u.
The magnetic amplifier colloquially known as a mag amp is an electromagnetic device for amplifying electrical signals. Embedded questions are inserted throughout each module, except for modules 19 and 20, which are reference books. Most of the citations are of patents you can still easily access. Us navy interior communications electrician rate training.
All books are in the public domain and are free for reuse and. It is almost similar to the above half wave amplifier circuit, but it utilizes both half cycles of the ac supply, hence it is termed as a full wave circuit. Magnetic amplifiers and their applications bright hub. This bulletin describes mag amp regulation in switching power supplies. An amplidyne is an electromechanical amplifier invented prior to world war ii by ernst alexanderson. World war ii germany perfected this type of amplifier, and it was used in the v2 rocket. First came the vacuum tube, then the transistor, right. The first flight took place in 1988, and magnetic amplifiers were introduced in 1995. Source s, through which the carriers enter the channel. A magnetic amplifier or saturable reactor control is illustrated in fig. Jun 18, 2020 the magnetic amplifier bibliography by the us navy, 1951 lists three alexanderson patents in 1916 and three extra in 1920, the final titled transoceanic radio dialog. Mag amps mean higher power density, simple control circuitry, very good regulation, high running frequency and rugged performance.
The fact that the germans introduced the device into fields previously dominated by electron tubes is considered by many to be as great a con trihution as the technical development of the device. It was used as an alternative to vacuum tube amplifiers where robustness and high current capacity were required. Magneticamplifier analysis using a generalized model for the saturable reactor core by herbert horace woodson s. Build transmissionlevel prototype for field demonstration, based on design and testing experiences from laboratory prototypes. Magnetic amplifiers for voltage regulation applications. This article includes a control circuit diagram for a magnetic amplifier and discusses the working theory of the circuit as well as the drawbacks of magnetic amplifiers. It consists of an electric motor driving a dc generator. As the dc level in the control coil is increased, the average value of magnetic flux within the core increases towards the saturation level thus limiting the variation of the. This aircraft is in service since 1997, and is expected to fly until 2040. Magnetic amplifiers a rising star in naval electronics. Of synchronous machines the synchronous electrical generator. A magnetic amplifier is an electromagnetic device that amplifies electrical signals utilizing a transformers core saturation principle, and the core non linear property. Theory of the magnetic amplifier the most importan component t o f a magnetic amplifier is the inductor whic consisth os f two a. Aes elibrary magnetic audio frequency amplifier fundamentals.
Conventionally, current entering the channel at s is designated by i s. Much of the howitworks above is from magnetic amplifiers by the us navy, 1951, recently republished. Lufcy, schmid, and barnhart1 of the naval ordnance laboratory. Magnetic amplifiers how they work and what they do.
Navy stated that, the magnetic amplifier is not new. Navy electricity and electronics training series historic. Three core materials are recommended for this application. The german navy used the magnetic amplifier in fire control systems. Topic 3 presents differential, operational, and magnetic amplifiers. The magnetic amplifier is an electromagnetic device for amplifying electrical signals. Magnetic amplifier structure honeywell regulator co. Synchronous generator pdf free download freesoftprofiles. Conventionally, current entering the channel at d is designated by i d. The former rivals the magnetic amplifier at the lower end of the power range and the latter at the higher end. Magnetic amplifier made from common 12 volt transformers. The magnetic amplifier has found its way into a vast number of commercial awlioa. Develop simple, robust, and efficient power flow control device cvsr based on magnetic amplifier principle.
By 1951, a navy engineer could write, electronics engineers are now forced to concede recognition of the magnetic amplifier, as it has demonstrated its value beyond question in many fields dominated by the electron tube. But, thanks to an old navy tech manual evident today only in some motorcontrol. Magnetic pickup signal leads should never be run in conduit, troughs, or bundles with other power or control voltage lines. This is a collection of navy training courses developed by the u. The purpose of this thesis is to apply the theory of magnetic amplifiers to achieve voltage regulation at the output of a circuit.
Electronics engineers of the 1950s believed the rugged little magnetic amplifier was going to replace the fragile vacuum tube in all its functions under abasic mag amp megacycle. Some of these are provided as pdf files, if you have trouble reading these, adobe acrobat reader is a free download. The magnetic amplifier was invented early in the 20th century 3. A simple electronic amplifier that works on the principle of magnetic saturation of a transformer core is called a magnetic amplifier.
Neets naval electrical engineering training series. After elementary and high school at havre, montana, he attended the english engineering institute at riga, latvia 19211923 while employed as communication officer for the american relief administration. States of america as represented by the secretary of the navy v application june 18, 1956, serial no. The magnetic amplifier and its application to radio. Magnetic amplifier systems westinghouse electric corp. The signal to be amplified is applied to the generators field winding, and its output voltage is an amplified copy of the field current. Magnetic amplifiers a rising star in naval electronics prepared by electronics design and development division, bureau of ships, dept. Three amplyides, from general electrics 1951 ad not on the same scale. Oct 28, 2016 voltage regulation of a synchronous generator using magnetic amplifiers.
1597 1635 410 887 918 1463 1674 1485 421 654 1177 1039 891 448 232 516 1293 819 1061 1619 985 451 1006 954 436 157 837 459 472