Toroidal cores - Technical Notes

Grain Oriented Silicon Steel (GOSS/CRGO)
The cold rolled grain oriented steel used in the production of our toroidal transformer cores consists of 3% silicon-iron alloy. Manufactured with a grain orientation facilitates very low power loss making the cores ideal for high efficiency transformers.

1.Up to 30% more flux for the same magnetising force
2.Increased rating for a given size of transformer.
3.Better regulation.
4.Reduction in size and weight
5.Reduced assembly time, storage and handling costs.

Limits of Tolerance
Inside diameter +-0.8mm
Outside diameter +-0.8mm up to 150mm +-1.2mm up to 230mm
Height -0+0.8mm for cores up to 60mm. -0+1.2mm for cores over 65mm

Performance Guarantee
Non-Impregnated toroidal cores are normally offered with the following standard guarantee.
0.3mm Grade M4 50Hz 1.0 Tesla limit: 19.0 A/M

Magnetic Degradation
Occurs when toroidal cores are impregnated with varnish or epoxy coated.
Light impregnated varnish +15%
Epoxy coated +40%