‘O-ring’ shaped transformer cores

Bridgeport, CT—Wound from grain-oriented silicon-steel strip gradually pointed towards the ends—rather than constant-width strip—O-Core transformer cores have a circular cross section, making them 15% smaller and lighter compared to traditional toroidal transformers. Standard O-core sizes have power ratings of 20-1,200 VA, 50/60 Hz.

By Staff September 1, 2002

Bridgeport, CT -Wound from grain-oriented silicon-steel strip gradually pointed towards the ends-rather than constant-width strip-O-Core transformer cores have a circular cross section, making them 15% smaller and lighter compared to traditional toroidal transformers. Standard O-core sizes have power ratings of 20-1,200 VA, 50/60 Hz. The rounded cross section saves on length of copper wire wound onto the core: 10% shorter turns than for square cross sections; 15% shorter than for 1:2 rectangular sections. It also permits simpler tape-only insulation. The more complex production process puts a 20% price premium (typical) on O-core vs. traditional toroidal cores. www.alphacore.com Alpha-Core Inc.