Toroidal transformers use circular or doughnut-shaped magnetic cores of ferromagnetic material like laminated iron, iron powder or ferrite, around which wire is wound. Due to the symmetry of the toroidal shape, the amount of magnetic flux that escapes outside the core is low, which results in more efficiency. These small sized toroidal transformers are used in a variety of electric circuits of amplifiers, inverters and power supplies to be used in electrical equipment like TVs, radios, audio systems and computers. Toroidal transformers are used in place of conventional transformers due to a variety of reasons, some of which are stated below.
Small size and weight
Toroidal transformers are almost half the size and weight of standard transformers. It is the higher efficiency that saves up to 50% of weight and size. This simplifies the design of cabinets, mounting configuration and mechanical geometry; thus making it useful for small and more compact electrical products. Moreover, the diameter-to-height ratio of a toroid can be easily altered suit the mechanical design, which makes it great for low profile equipment.
Low magnetic field
Because of its unique construction where windings that cover the core act as a shield, toroidal transformers radiate about 1/10th the magnetic field of other types of transformers. The magnetic field transforms energy from primary to secondary and eliminates the need for special shielding. This makes toroidal transformers highly suitable for applications in electronic equipment like medical equipment and low level amplifiers.
Low excitation power
It takes very less energy to maintain the magnetic field in a toroidal core, which is known as excitation or quiescent power. Toroids require only 1/16th the excitation power of other transformers, which means 1/16th the electricity required by other transformers in standby mode. This results in big savings in large transformer applications like industrial controls.
Low mechanical hum
The windings tightly enveloping the core and the absence of air gap effectively reduces magnetostriction, which is the main source of mechanical hum found in other transformers. The air gap absence provides 8:1 reduction of auditory noise, which is why toroidal transformers are silent. This makes these transformers the most ideal equipment to be used in hospitals and office environment where annoying hum is not acceptable.
Easy to mount
All you need to mount a toroidal transformer is a single center screw instead of four screws used for other transformers. This ease of mounting reduces assembly time and speeds up production time, lowering the parts count of mounting hardware.
With constant cross-section, the diameter and height of toroidal transformers can be altered to suit any application. This means that unlike other transformers, 300VA toroids can be used in single rack height equipment.
With all these benefits of toroidal transformers like low magnetic field, low noise, small size and low excitation power, toroidal transformers can provide maximum value for money. Apart from the advantages mentioned above, these transformers can also be customized and incorporated with required features to benefit almost any kind of application. You can count on Miracle Electronics, the leading manufacturer of toroidal transformer in India to provide you with customized transformers to suit your application type to the fullest.