Encapsulated PC Transformers 1VA - 160VA Power Transformers 1VA - 7.5kVA Encapsulated Styles 1VA - 500VA Special Mounting Configurations In Standard Configurations and to Customer Specifications nt magnetics nuvotem Toroidal Transformers for Universal Application SECTION 1Application Transformer hum TALEMA Toroidal Transformers meet Because there are no air gaps, there are modern day requirements for a small no loose sheets which can vibrate. In size, low magnetic interference field addition, the high quality of the grain transformer. Featuring a nearly ideal orientated silicone alloyed electric steel physical construction, the design makes the magnetostriction very low, engineer can expect excellent thus allowing the disturbing hum found performance. Small size and weight in most common types of transformers (approximately 50% of conventional to be almost completely eliminated. TALEMA PROFILE transformers), extremely low noise and The TALEMA International Group of Mounting details low magnetic interference field make the companies began in 1975 with the For sizes up to 1000VA, a low cost toroidal transformer ideal for compact assembly can be made with a center- formation of Talema Elektronik power supplies. Modern production GmbH in Munich, Germany. Five ing washer and a center screw or bolt. techniques make it possible to produce years later, in 1980 Nuvotem Teo Transformers in the range of 15VA toroidal transformers at practically the started manufacturing in Ireland. through 500VA can also be potted in same prices as conventional standard Polyamid housings. All In 1988 Talema began production transformers making them ideal for a in India and expanded into the transformers can also be center potted wide range of applications including: Czech Republic with the formation - either with a center hole or with a professional audio equipment threaded insert. of TALEMA spol s.r.o. in 1992. computers and peripherals video monitors Today the TALEMA International motor controls Group, with three manufacturing compact power supplies facilities and over 1000 employees medical equipment in Europe and the Far East, is a instrumentation world leader in the manufacture of office machines toroidal transformers and related industrial control equipment magnetic components. The vast low voltage lighting majority of the output, around 85%, is of custom built products although a comprehensive range of standard Volume and weight devices is also available. Production program The toroidal core has the optimal shape Standard Distribution: for producing a transformer with the Open wound, Standard and Mini Encap- minimum of material. Because the sulated Print & DIN Rail Transformers - quality of the core is such a vital 230V primary, with ENEC KEMA-KEUR consideration for sensitive applications, marking (see page 8) TALEMA has invested heavily to provide extensive core manufacturing, annealing Customer standards: and testing facilities. Open wound, Encapsulated, Print, DIN Rail, a wide range of secondary volt- All windings are symmetrically spread ages and mounting styles (see page 6) over the entire core which makes the wire length very short. A higher flux density Specials: is possible as the magnetic flux is in the per customer specification (see page 5) same direction as the rolling direction of Power: 1.6VA - 7.5kVA per phase the grain orientated core allowing Special sizes extremely flat or small significant savings of volume and weight diameter, i.e., up to 250VA with . A higher current density can flow 96mm O.D. for European P.C. formats through the wire as the whole surface of Electrostatic copper shielding the toroidal core allows efficient cooling Operating frequencies up to 20kHz of the copper windings. Note: All products manufactured by Assembled 3 phase sets the Talema Group are RoHS com- The iron losses of the toroidal core are Magnetic shielding pliant. very small, typically 1.1W/kg at 1.7 Potting in special housings for sizes Tesla and 50Hz, giving very small up to 1.2kVA magnetizing current, which contributes Secondary voltages available up to to the excellent temperature rating of the 1kV toroidal transformer. THE TALEMA GROUP Toroidal Transformers for Universal Application 2