Dec 17, 2015 You would use magnetic flux in a Faraday's Law calculation, or to calculate inductance (two different ways to do the same thing). Magnetic field intensity (H) is dependent on the current, length, and number of turns. So far I am looking at 1000 turns of 10 gauge magnetic wire for 1 meter. (gonna be pretty expensive) and 10 amps current.
In our daily life, we come across televisions, computers, CD players and many other devices with speakers producing sound to watch programs, movies, listening music, news etc. The sound of these devices can be altered in order to achieve the good audible sound according to the requirement of the listener. This sound can be increased or decreased by using the electronic device namely Amplifier. What is an Amplifier?The amplitude of a signal waveform can be increased by using an electronic device called as an Amplifier. By consuming energy from a an electronic amplifier increases the power of a signal to control over the shape of the output waveform which indicates the identical input signal but output signal will be with larger amplitude compared to the input. The general symbol of an amplifier is shown in the below figure.
Symbol of an AmplifierAs the amplitude of the waveform is getting amplified (modified or increased) these electronic devices performing this amplification process are named as Amplifiers. The classification of amplifiers has done based on the different criteria such as size of the signal, circuit configuration, operation and etc. There are different types of amplifiers, including Voltage amplifiers, Current amplifiers, Power amplifiers, Vacuum tube amplifiers, Magnetic amplifiers and so on. Magnetic AmplifierThe electromagnetic device used for the amplification of electrical signals which utilizes the magnetic saturation of core principle and certain core non linear property is called as Magnetic amplifier.
It is invented in early 1885 and is primarily used in theater lighting and it is designed with basic of design Saturable Reactor and hence can be used as saturable reactor in electrical machinery. Magnetic amplifierIn above figure, amplifier consists of two cores with control winding and AC winding.
By using small DC current fed to control winding the large amount of AC currents on AC windings can be controlled and it results in current amplification. Two cores are connected in opposite phase for canceling the high flux generated AC current in control windings. The magnetic amplifier can be used to convert, multiply, phase shifting, modulate, magnify, invert, pulse generation, etc. It can be simply called as one type of control valve using an inductive element as. Magnetic Amplifier TheoryEarlier in this article we studied that it is designed based on the design of the saturable reactor, which consists of major parts such as DC source, magnetic core (with windings) and AC source.
Saturable reactor works on the principle by varying the saturation of the core the current flow through a coil wound on a magnetic core can be varied. By saturating the magnetic core the current to can be increased and by desaturating the magnetic core the current to the load can be decreased.In the period of 1947 to 1957 decade, it was mostly used for low frequency applications and in. But after the establishment of transistor based amplifiers these are reduced to using in large extent, but still these are used in combination with transistors for some extremely demanding and high reliability intended applications. Principles of Magnetic Amplifier CircuitsThese are divided into two types as half wave and full wave magnetic amplifiers.Half wave Magnetic AmplifierWhenever DC supply is given to the control winding then the magnetic flux will be generated in the iron core. With the increase in this generated magnetic flux the impedance of the output winding will decreases, then the current flowing from the AC supply through the output winding and load will increases. Here it utilizes only half cycle of the AC supply; hence it is called as a half wave circuit.
Half wave Magnetic AmplifierAt the core saturation point, at which the car is having a maximum flux it can hold, as the flux is maximum the impedance of the output winding will be very low making very high current to flow through the load.
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