EI86 Audio Line Power Transformer

EI86 Audio Line Power Transformer

In an E-I structure, the matching “E” and “I” components are stamped from sheets of thin grain-oriented electrical steel that are later stacked to create the core. The primary and secondary windings are wound on bobbins. Multiple bobbins are placed on spindles and spun in order to apply the windings.

This method of using bobbins allows for automation that reduces the manufacturing times and also provides insulation between the windings and the core. The E-I core laminations are stacked inside the bobbins to complete the transformer. Their ease of construction makes standard E-I transformers very economical to manufacture, which is their primary advantage.

Although economical to manufacture, standard E-I transformers do have several limitations. As the punched laminations are stacked to form the core structure, small imperfections and burrs in the butting edges of laminations create an effective “air gap” which reduces the operating flux levels. Decoupling of windings is more common with linear construction, and as a result, leakage inductance and stray capacitance are naturally higher. Additionally, the loose laminations will vibrate at the fundamental frequency, which introduces disturbing hum (mechanical noise). All these disadvantages result in a transformer of larger size with less efficiency.

Application Fields

Widely used in public broadcast system, ceiling speaker, audio amplifier, stage lighting, radio communication, radio and television, conference system, frequency divider, automatic control and other fields

Material