history of magnetic amplifiers
first magnetic amplifiers were created in the early nineteenth century.However, they have received widespread use in the second half of the twentieth century.
first countries in which there were reliable magnetic amplifiers were the United States and Germany.There they first made for military purposes during World War II.In the mid-fifties, magnetic amplifiers were replaced many tube that performs the same function, but are more fragile.They still apply to devices used in adverse conditions.
magnetic amplifier is able to capture almost the entire range of RF signals.This feature can be used to send radio messages over long distances.For this reason, the first radio amateu
rs experimented with the use of high magnetic amplifiers to transmit messages in Morse code across the ocean.
Structure and working principle of magnetic amplifiers
magnetic amplifier consists of two repeating coils of wire, each of which is wrapped around the magnetic core.For his work to one of the coils is fed AC voltage and current.When the load on one of the coils reaches its maximum, there is an electromagnetic field.Then there is a corresponding magnetic field in the second coil, and the device begins to work.
This scheme allows you to control electrical loads without the actual physical connection or special sensors.Magnetic amplifiers usually have unlimited lifetime, since they have no moving parts that can wear out.For this same reason, they are resistant to vibration and shock and can be used in any environment.Due to these advantages, they are often used in industrial equipment.
Disadvantages magnetic amplifiers
magnetic amplifier has some drawbacks.Size - this is one of the biggest challenges of such elements.Modern transistors can perform the same function, occupying much less space.Magnetic amplifiers are not as effective as modern solid-state transistors are used to reduce power losses.Magnetic amplifier gain is also much lower compared to the semiconductor elements.
This encourages producers to replace magnetic amplifiers in their solid counterparts.However, soon may be new types of magnets, and based on them will be the next generation of these devices.