The transformer is often one of the core parts of heavy machines. This devise is designed to convert low and high voltages, as well as for the transfer of energy from one circuit to the next using magnetic coupling. The transformer is made up of no moving parts but instead uses multiple coupled windings or one tapped winding and a magnetic core for the concentration of magnetic flux. The transformer core is made of thin sheets known as laminations that are coated with insulation then stacked together.
During an AC DC motor rewinding, this insulation will be re-installed after the process to guarantee the optimal functioning of your windings. The laminated core’s construction is meant to reduce the eddy current that would cause wastage of the energy in your transformer. The core is made of a magnetic material so that it confines the magnetic field of your transformer and further decreases energy loss. Here are the material options for transformer cores.
This is considered the most popular material now used for the making of magnetic cores for machine transformers. Amorphous steel cores are made of multiple paper-thin strips that will decrease the flow of eddy current. The core thus has less energy loss compared to transformer cores made of other materials. Moreover, it will operate at higher temperatures than those a standard lamination core might have to endure. Amorphous steel cores are typically used in high-efficiency transformers operating at a medium frequency.
This material is renowned for retaining a high magnetic field in your magnetic flux without the risk of iron saturation. Solid iron cores are not recommended for use in transformers in AC applications since they have large eddy currents generated by their magnetic field. The eddy currents in this instance will generate heat at considerably high frequencies that can only be supported by DC applications.
These are made of ceramic compounds in combination with one or several metallic elements. Ferrite ceramic magnetic cores suffice for high-frequency applications. They are created in varying specifications for several electrical requirements. Ferrite ceramic materials also serve as effective insulators and will reduce the generated eddy currents.
This has a high electrical resistance and will thus give you a stable transformer performance for years. Silicon steel also has a high saturation flux density. Some years back, silicon steel characteristics were altered, and various chemical changes were introduced. Nowadays, the silicon steel used for transformer cores is called the AISI type M6. This has low energy losses and high permeability and is therefore used in high-frequency applications.
This is a powdered compound that creates a stable current across varying temperatures and magnetic flux levels. Carbonyl iron powder cores will have small iron spheres coated using a thin insulating layer. The cores decrease the impact of eddy currents at a high temperature.
The ideal material option from the ones above primarily depends on the voltage of your machine. While the transformer core can be changed if it malfunctions, the replacement material should be one that supports your application. It is thus essential to have the repairs handled by a professional to guarantee the replacement material for your transformer cores does not cause costly machine failures.