Download TORODIAL TRANSFORMER In 1831, Michael Faraday wound three

TORODIAL TRANSFORMER
In 1831, Michael Faraday wound three lengths of wire 24 ft. long for the primary winding and
two lengths of wire 30 ft. long for the secondary winding, to shape the world’s first transformer
which was Toroidal. Development in the mid 1900s have since made toroids a practical
possibility.
Today experts worldwide rate Toroidal Transformers far higher than all other transformers. The
reasons are simple. Compact size , superior performance. Durability and cost efficiency. Yet the
Indian electronic and electrical industries are forced to use ‘E & I ‘ core transformers because of
unavailability of indigenous Toroidal Transformers. Wherever design parameters dictate the use
of Toroidal Transformers, import till now was the only answer.
This is ESPEE ELECTRICALS can make a difference. And provide winning solutions in the world of
transformers.
The Company
ESPEE is a pioneer in the manufacture of Toroidal Power Transformers in India. Its thrust is
towards customized Toroidal Transformers for the domestic and international markets.
The Product
Espee Toroidal Transformers have a Va rating between 50 to 3 KVA. Their tape wound CRGO
silicon steel core are constructed with metal tape wound onto a mandrel under closely
controlled tension, then annealed and treated to fully develop the required magnetic
characteristics of Torodial cores are never dependent on their assembly. The air gap in this core
is zero. The super enameled copper wire is then wound by an automatic winding machine
uniformly around the entire length of the toroid, assuring uniform quality.
The shape of the core is such that the magnetic field of the toroid is contained within itself.
Hence there’s no radiation of stray magnetic flux and the Transformer can be placed in high
density electronic circuitry without any interfering hum. Leakage inductance and stray
capacitance are also very small. And when the Toroidal Transformer is placed in an interfering
field, the interfering forces tend to act equally all around the toroid, resulting in the
cancellation of interfering voltages in the coils in a manner similar to the astatic windings.
The Advantages
ESPEE Toroidal Transformers have a number of obvious advantages over the conventional ‘E &
I’ core transformers. They are as follows.

Maximum utilization of the flux density generated leads to higher efficiency and lower
percentage regulation.

Lack of interfering hum eliminates the need for magnetic shielding , which is required by
conventional transformers, and also enables the toroid to be fitted into electronic
circuitry without causing electrical interference.

The winding covers the entire length of the core thus further minimizing the leakage
inductance by maintaining all the lines of flux within the core itself.

The air gap losses in a Toroidal Transformer are nil and the superior CRGO core results in
negligible energy loss leading to greater efficiency and superior performance and that
too at a lower cost.

The height of a Toroidal Transformer is considerably lower than the ‘E’ & ‘I’ core
transformer. Which means that it’s ideal for ‘Slimline’ electronics. Moreover, the
variable core geometry ensures that a Toroidal Transformer can be designed to fit in a
specific space – a tremendous advantage where space is a constraint.

Its compact size makes the Toroidal Transformer lighter than other transformers. A
single bolt mounting eliminates the need for an additional bracket and mounting bolts
leading to easier mounting and a lighter end product.

The Toroidal Transformer is cooler because its surface area is greater than other
transformers.

The characteristics of toroids are never dependent on the way the use assembles the
core; they are assembled and treated at the factory for optimum results which enhances
performance.

Toroidal Transformers come in a variety of finishes. You can chose from metal case,
thermoplastic resin filled case, thermosetting varnish glass cloth, cotton cloth and
plastic tape finishes.
The Applications
Toroidal transformers enjoy diverse applications. They can be used as Power Transformers,
Impedance Transformers, Isolation Transformers, and Inverter/Converter Transformers various
sizes and specifications. Toroidal Transformers can replace ‘E” & ‘I’ transformers as a cheaper
and far better alternative.
For example, they can be used in Power Supplies for Consumer Electronics, Industrial
Electronics (Control Panels, Automation), Analytical Equipment (Medical, Engineering ,
Electronics etc.) Communication and Broadcast, equipment (Receivers Transmitters, EPBAX ,
Electronic Switching Systems etc.,) D.C. regulated and unregulated Power Supplies, Laboratory
Power Supplies, Voltage Stabilizers, DC Converters, Inverters, Battery Chargers, Battery
Eliminators, Uninterrupted power supplies.
The Services
A toroidal transformer is designed and developed by Espee Electricals only after it receives
specifics from the clients. A detailed report accompanies the transformer design to the client .
Espee also has the capability to assist in mounting, chassis design and incorporation of Toroidal
Transformers into existing or new equipment.