EI Transformers Versus Other Kinds Of Transformers - Miracle Electronics

1
When dealing with applications requiring electric
circuits, you want to be able to choose the
right kind of transformers to transfer electrical
energy between your circuits appropriately for
the particular purpose in use.
There are a lot many different transformer types
available, such as power, toroidal, isolation,
etc. While all these transformer types are the
most basic ones, theres one that is, although
an old one, but is becoming increasingly popular
now the EI transformer. What makes the EI
transformer different? EI, as the name itself
suggests, is a transformer that is combined by
the laminations of the shape E and I. The 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 of this kind of transformer
are wound on bobbins, with multiple such bobbins
placed on spindles, spin in order to apply the
windings. This method of using bobbins allows
for automation, which reduces the time of
manufacturing, while also providing insulation
between the windings and the core. It is very
easy and economical to construct such EI
transformers, which is the primary reason why EI
transformers are becoming so popularly used.
2

• Do EI transformers have any drawbacks?
• Just like anything else, even EI transformers,
  along with their advantages, also have their
  drawbacks. In the construction of such
  transformers, as the punched laminations are
  stacked to form the core structure, small
  imperfections ad burrs in the butting edges of
  the laminations, create an effective air gap,
  which reduces the operating flux levels.
  Moreover, the loose laminations vibrate at the
  fundamental frequency, producing a certain
  amount of mechanical noise.
• Why should one use EI transformers?
• As you can see, EI transformers prove to be a
  noisy product with small imperfections in the
  structure. Why would one want to use such a
  product then? Thats because there are many
  tiny, yet beneficial, advantages that one can
  have with an EI transformer. For instance,
• EI transformers are easy and economical to
  manufacture.
• EI transformers primary resistance is greater.
• EI transformers have lower coupling capacitance
  between the primary and secondary, thus blocking
  high frequency common mode noise from main AC.
• EI transformers can mount at multiple points,
  making it a better choice for equipment that is
  likely to face a lot of vibration or impact, so
  that there is lesser chance of the transformer
  coming loose easily.
• An EI transformer is thus a better bet when the
  weight and size doesnt matter much what
  matters is the cost, the performance, and the
  other benefits that it offers. An EI transformer
  is better for low wattage applications, as the
  stray magnetic field is pretty small, and can be
  blocked efficient with shielding. So, when youre
  looking for performance and pocket-friendliness,
  rather than the size and weight, its EI
  transformers for you. And, you can get the best
  quality product at Miracle Electronics, the most
  reliable EI transformer manufacturer in India,
  where every product offered is RoHS and REACH
  compliant, thus ensuring quality and performance.