Transformer Laminations Wikipedia

Electrical steel is usually manufactured in cold rolled strips less than 2 mm thick.

Transformer laminations wikipedia. Thin laminations are generally used on high frequency transformers with some of very thin steel laminations able to operate up to 10 khz. From initial transformer lamination production in 1927 to serve the infant radio industry thomas skinner s ei transformer lamination operation led the way pioneering large three phase wide window and thin gauge laminations. The insulated laminations minimizes eddy current losses in the iron core. Wikipedia defines eddy currents as.

They are available in power ratings ranging from mw to mw. Electrical steel lamination steel silicon electrical steel silicon steel relay steel transformer steel is an iron alloy tailored to produce specific magnetic properties. The insulation materials used in transformer construction varies but are mainly the finish applied to the laminations varnish or coated insulation on the wire paper fish paper crepe paper etc or plastic film for the coil cardboard or plastic for the bobbin and the varnish that the completed transformer is dipped into at the end of construction. Lamination is the technique process of manufacturing a material in multiple layers so that the composite material achieves improved strength stability sound insulation appearance or other properties from the use of the differing materials such as plastic a laminate is a permanently assembled object created using heat pressure welding or gluing.

High permeability and low distortion 80 and 49 nickel alloy and cobalt iron standard material thickness of 0 35 mm 0 20 mm and 0 15 mm. Laminating the core greatly reduces eddy current losses one common design of laminated core is made from interleaved stacks of e shaped steel sheets capped with i shaped pieces leading to its name of e i. Eddy currents are loops of electric current induced within conductors by a changing magnetic field in the conductor due to faraday s law of induction. Now the transformer core looks like a secondary winding but since the ends aren t connected it is always open circuit and therefore not present electrically.

A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical electromechanical and magnetic devices such as electromagnets transformers electric motors generators inductors magnetic recording heads and magnetic assemblies it is made of ferromagnetic metal such as iron or ferrimagnetic compounds such as ferrites. Again look at large line frequency power transformers and you will sometimes be able to see a spiral of thin layers instead of parallel flat layers as. This is the most common type of transformer widely used in electric power transmission and appliances to convert mains voltage to low voltage to power electronic devices. Small hysteresis area resulting in low power loss per cycle low core loss and high permeability.