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VACUUMSCHMELZE GmbH & Co. - Elizabethtown, KY

Original Press Release

Cores, Transformers and Chokes at the VACUUMSCHMELZE Stand at PCIM 2014 in Nuremberg

Press release date: March 31, 2014

Hanau / Frankfurt — The Cores and Components division of VACUUMSCHMELZE GmbH Co. KG (Hanau) will again attend PCIM in Nu-remberg. From 20th to 22nd May, VAC's stand 119 in Hall 7 will focus its product presentations on cores, transformers and chokes using the nanocrystalline material VITROPERM.

This year, VAC will highlight its IGBT drive transformers, tape-wound and cut cores for power transformers and common-mode chokes for EMC filters.

IGBT drive transformers based on nanocrystalline magnetic cores feature good sensitivity over a broad operating temperature range from -40 to +105C, as well as low coupling capacitance for the precise control of high-power semiconductors. These components are remarkable for their compact size and outstanding dielectric strength. The transformers are 100% high-voltage tested, with partial discharge tested to international standards and insulation in compliance with EN50178, IEC 62109 or IEC 61800-5-1.

In line with the trend towards SMD, VAC now offers several new models, includ-ing two models with typical transformation ratios of 1:1:1 and 1:1:1:1 and partial discharge voltage around 1.25 kVrms.

kW power transformers for traction applications are based on nanocrystalline ring cores, which offer significantly higher saturation induction (1.2 Tesla) than ferrite cores and in addition, low hysteresis losses; these properties deliver the advantages of higher power density, enhanced efficiency and an extended oper-ating range (up to 120 C). Power transformers of this type are generally pro-duced as custom designs.

VAC also supplies cut cores of nanocrystalline VITROPERM for power transformers with pre-wound coil bobbins. These cores are used for transformers in applications where low loss and/or low noise are critical. Compared to conven-tional core materials such as amorphous iron alloys, the losses of VITROPERM cores are two to four times lower at frequencies above 1 kHz.

A factor impacting on noise in power transformers is the inherent magnetostriction of the core material. With a factor of 10 to 100 lower than that of amorphous iron alloys, VITROPERM has extremely low magnetostriction. Cut cores are impregnated with resins which are suitable for temperatures of 105 C (standard) and higher.

The "Cores for Power Transformers" sample kit comprises 10 tape-wound cores and one small cut core, and enables developers to make direct comparisons of different core geometries.

Common mode chokes with nanocrystalline toroidal tape-wound cores are suitable for EMC filters over a wide range of operating currents, from a few amperes to high rated currents of over 800 A. Various insulation concepts enable the cores to be operated in AC grids and at DC voltages of up to 1 kV.

Customers can select from an array of components for single-phase or multi-phase systems or enquire about customized designs. Recent industry develop-ments have increased the focus on asymmetrical designs with neutral conductors for other types of current rather than phased current. VAC thus provides custom-ers with the maximum flexibility in filter design.

A CMC Sample Kit, with a selection of 24 common mode chokes, and a Core Sample Kit are available for customers' in-house development tests.

VACUUMSCHMELZE (VAC) with 4100 employees worldwide, thereof 1,450 employees in Hanau, designs, produces and markets advanced materials, primarily magnetic but also with other physical properties, and related products. In 1914 the first vacuum furnace laid the foundation for today's VACUUMSCHMELZE. Industrial vacuum melting techniques for alloys have been in operation since 1923.

VAC Group today achieves annual sales exceeding 400 million euros in over 50 countries and is the holder of around 800 patents, placing it among the world's most highly innovative developers of advanced industrial materials.

VAC's portfolio comprises a broad array of semi-finished products and parts with superior magnetic and physical properties, inductive components for electronics, magnets and magnetic systems for use in a wide variety of fields and industries from watch-making to medical technology, renewable energies, shipbuilding, installation, and the automotive and aviation industries. VAC's custom solutions are developed in close collaboration with the customer, reflecting the company's expertise in materials and state-of-the-art production technology.

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