I have some technical questions about a toroidal transformer core

[Sudalai]

I have 150 x 100 x 60 M4 grade toroid core and same grade slit coil, I need to 180 x 100 x 60 in my design purpose.i would like to add OD 20 mm. my suspicion is a slit that can be added should be on the same grade?

 

[berkeman]

I have 150 x 100 x 60 M4 grade toroid core and same grade slit coil, I need to 180 x 100 x 60 in my design purpose.i would like to add OD 20 mm. my suspicion is a slit that can be added should be on the same grade?

Is 150x100x60 in mm? That's a big toroid! What is it used for? Can you post links to the datasheets of the two cores you are asking about?

And what is a "slit coil"? I'm not familiar with that term yet...

 

[Sudalai]

Yes, this is medium size toroid core Slit coil means The manufacturing of strips wound cores is a specialized process, which requires a high degree of precision. These cores are manufactured from selected coils of CRGO electrical steel to yield closely controlled electro-magnetic characteristics and dimensional accuracy. Cores are wound as loops (two halves with overlapping ends joined together to form loop in multiple layers of the wound core) after slitting is done as per the required shape depending upon the rating and specification of the transformer on design parameters on the Unicore wound making machines. The Machine automatically stops when the pre-decided dimension is reached. The cores are stress-relief annealed to restore the magnetic properties. The cores are bonded where necessary, to provide increased firmness.

 

[essenmein]

So this is a low frequency core made of magnetic steel and the "slit coil" is simply to break up the eddy currents that would exist in the toroid similar to how transformers are made of lamination's rather than a solid block?