Time:2025-01-17 Browse: 20
istorical Development of Cores
Early Explorations
In 1950, An Wang, an American physicist, proposed the idea of using materials to manufacture memories.
The Era of Core Storage
In the 1950s, Jay Forrester turned An Wang's idea into reality. He obtained materials with specific properties by melting iron ore and oxides and manufactured core storage devices. core storage remained the standard method for computer main memory from the 1950s and 1960s until the early 1970s.
A core memory is a type of random - access memory. Its working principle is to use the magnetized or non - magnetized states of rings (magnetic cores) to represent 1 or 0. A long string of combinations of 1s and 0s represents the information to be stored.
Development of New Core Materials
Ferrite Cores: Based on the early development of cores, people gradually developed various types of core materials. Ferrite cores were widely used in the 20th century. They have characteristics such as high resistivity, moderate permeability, good chemical stability, excellent soft - properties, and relatively low cost. They are suitable for high - frequency circuits and are widely used in areas such as the power supplies of consumer electronics products.
Silicon Steel Cores: Silicon steel cores emerged relatively early. By adding silicon elements, the eddy - current and hysteresis losses were reduced. They have high permeability, high saturation induction intensity, and good mechanical properties, and are mainly used in power transmission and conversion equipment such as large - scale power transformers and industrial AC motors.
Amorphous Alloy Cores: Amorphous alloy cores are special materials formed through specific processes. They have excellent soft - properties, low coercivity, high saturation induction intensity, and low losses. However, their properties are relatively sensitive to temperature. They are commonly used in fields such as switching power supplies, inverters, and high - frequency transformers.
Nanocrystalline Cores: Nanocrystalline cores are relatively newly developed core materials. They have advantages such as ultra - high permeability, low losses, good temperature stability, and high saturation induction intensity, and are widely used in high - precision sensors, modern communication equipment, and other fields.
Permalloy Cores: Permalloy cores are alloys mainly composed of iron and nickel. They have characteristics such as extremely high permeability, low coercivity, high permeability bandwidth, and low magnetostriction coefficient, and are commonly used in precision measuring instruments, communication equipment, audio equipment, and other fields.
Expansion of Modern Applications
With the continuous progress of science and technology, cores have been applied and developed in more fields. For example, in power electronics technology, they are used in components such as high - frequency transformers and inductors to achieve efficient conversion and transmission of electrical energy. In the communication field, they are used in filters, antennas, etc., to improve signal quality and transmission efficiency. In the computer field, although core memories have been replaced by semiconductor memories, cores still play an important role in some storage devices.
