Power Transformer Core has circular cross section.

Press Release Summary:

O-Core uses silicon steel strip, gradually pointed towards end. Transformers wound on O-cores are 15% smaller in size and weight than toroidal transformers. Available with power ratings from 20 to 1200 VA, 50-60 Hz operation, O-cores use grain-oriented silicon steel. With fully rounded edges, transformer does not require epoxy fluidizing or injection molded core jackets, and can be insulated by Mylar or Nomex tape.

Original Press Release:

Toroidal Power Transformer Cores Now Made Even Smaller

Bridgeport, CT Alpha-Core, Inc. has introduced the "O"-Core to the North American market. A process patented by Nippon Core, a Chinese manufacturer, now licensed to Alpha-Core, uses silicon steel strip, gradually pointed towards the end, replacing the constant width strip used in traditional toroidal transformer cores. As a result the cross section of the O-core is circular like an o-ring, rather than square or rectangular of the traditional toroidal core. Toroidal power transformers are the preferred choice by design engineers in medical electronics, audio and broadcasting equipment, test & measurement instrumentation, robotics and other industries where size, weight and low EMR (Electro-Magnetic Radiation) are crucial. Transformers wound on O-cores are 15% smaller in size and weight than traditional toroidal transformers. Available in standard sizes for power ratings from 20VA to 1200VA, 50-60Hz operation, 0-cores can also be customized. The 0-core uses the same type of grain-oriented silicon steel as the traditional toroidal core and therefore offers the same superior electrical characteristics when compared to a conventional stacked lamination type transformer. When winding the copper wire onto the O-core, the length of each turn is roughly 10% shorter than that used on a traditional toroidal core with a square cross section. There is a full 15% savings over a rectangular cross section with a 1:2 side-to-height ratio, the most common core shape of toroidal power transformers. Because 0-cores are more difficult to manufacture with higher scrap losses, the price will typically be 20% higher than the traditional toroidal core. In addition to creating a smaller finished toroidal transformer, the fully rounded edges of the core, allow the transformer manufacturer to use much less tension when winding with heavy gauge wire. This eliminates the risk of insulation damage caused by the sharp edges of the traditional core. Also due to its rounded cross section, the O-core does not require epoxy fluidizing or injection molded core jackets, but may be adequately insulated by Mylar or Nomex tape. Alpha-Core Inc. continues to offer the traditional toroidal cores wound from continuous strips of grain-oriented steel, it has made since its founding in 1982.
For more product information, contact Ulrik Poulsen, at 203 335 6805, or sales@alphacore.com or visit www.alphacore.com.

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