Should You Choose An EI Transformer Or Not?


Working on the principle of Faraday’s law of induction, a transformer basically serves the function of converting electrical energy from the present value to the value that is required. But, a transformer is not only of a single type. There are a multitude options available when it comes to choosing a transformer, such as power transformers, isolation transformers, toroidal transformers, EI transformers, SMPS transformers, and many more. Yet, all of them perform the basic function of transmitting power, signal, or data from one point to another, each differing from the other in only a few aspects that make them unique.

The basic working of a transformer

A transformer links together two or more electrical circuits, using a common oscillating magnetic circuit that is produced by its core. This becomes possible as it operates on the principle of electromagnetic induction in the form of mutual induction, wherein the coil of wire magnetically induces a voltage into another coil located in close proximity.

How transformers enable long-distance power distribution

With the above-mentioned Faraday’s law of magnetic induction, a transformer is capable of stepping up or down voltages to any level required. The power converted can be distributed across vast distances using a grid of pylons and cables. The power that is to be distributed across such large distances is first converted to a much higher level, and then reduced to a lower, safer, usable voltage as it reaches the destination, where it can be used to power up the electrical equipment in residential, commercial, and industrial applications.

What makes an EI transformer unique?

As mentioned above, transformers are available in a variety of options, which makes it very important for you to choose the most suiting transformer for your particular application. Here, in this blog, we’ll speak about one of the most popularly used transformers today – the EI transformer.

The EI transformer, just like any other transformer, consists of a primary winding that produces magnetic flux in the core when connected to the electrical source, and a secondary winding that outputs the secondary current generated by the magnetic flux in the core. The transformer core provides a low-reluctance path through which the magnetic flux can move from the primary to the secondary, creating a closed magnetic circuit. So then, what is it that makes it unique versus other kinds of transformers?

As the name itself suggests, in the EI transformer, the core is in the shape of an “E” and an “I”, stamped from sheets of thing grain-oriented electrical steel, stacked to create the core. The primary and secondary windings are wound on bobbins, with multiple bobbins being placed on spindles and spun in order to apply the windings. This unique method is what makes it different, and helps with automation that reduces the manufacturing time, and provides insulation between the windings and the core. The ease of construction also makes EI transformers very economical to manufacture.

Choosing an EI transformer over other transformer types

With the unique construction, and the cost-effectiveness associated with an EI transformer, it certainly seems to be the best option. But, this doesn’t come without any drawbacks. The major drawbacks that come with an EI transformer are that it comes with a disturbing hum (because of the loose laminations vibrating at the fundamental frequency), and that it is large in size. But, if these drawbacks can be disregarded, EI transformers are the best choice for an easy-to-manufacture, economical, easy-to-mount transformer that have greater primary resistance, and low coupling capacitance, thus blocking high frequency common mode noise from the main AC. All in all, EI transformers are an economical solution that meet many power conversion needs.

After considering all of the above, if you’re looking to purchase an EI transformer for your application, you can always approach Miracle Electronics, the finest EI transformer manufacturer in India, whose transformers are extremely durable, come with superior wiring, varnishing, and connection terminators, proving to be highly efficient, providing excellent regulation with minimal temperature rise. You can also choose to have your transformers customized, and no matter what you choose to purchase, every EI transformer available here is RoHS, High, and REACH compliant.

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