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Quality Standards

Tolerance chart
for CRGO laminations 001

ATTRIBUTE ACCEPTANCE LIMITS
THICKNESS + /- 0.02 mm. Total difference in thickness in a direction Perpendicular to rolling direction should not exceed 0.02 mm
LENGTH Upto 700 mm + 0.0 /-0.5 mm 701 to 2000 mm + 0.0 /-1.0 mm Over 2000 mm +0.0 /-1.5 mm
WIDTH Upto 150mm +0.0/-0.2 mm
151 to 500 mm +0.0 /-0.3 mm
501 mm and above + 0.0/-0.4 mm
CAMBER 0.9 mm max. on a length of 2000 mm per side on surface table
V NOTCH 90 deg + / - 5 minutes
MITRED ANGLE 45 deg + / -5 minutes
HOLE DIAMETER + 0.10 /-00 mm
STACKING FACTOR 95 % min. for 0.23mm thick material
96 % min. for 0.27 mm and 0.30 mm thick material 96.5 % min. for 0.35 mm thick material
INSULATION RESISTANCE Min. 10 ohms /cm2 as per Franklin method described in IS 649 -1997
BURR 20 microns maximum
WEIGHT OF EACH STEP +0.5% TO 1.0% or as per customers requirements.
WATT LOSS / KG As per old AISI and BIS 601 the Watt Loss/Kg is as follows :-
M-3 - 0.77 watts/kg at 1.5T and 50 Hz
M-4 - 0.89 watts/kg at 1.5T and 50 Hz
M-5 - 0.97 watts/kg at 1.5T and 50 Hz
M-6 - 1.10 watts/kg at 1.5T and 50 Hz

However for the last couple of years the emphasis has shifted from the guaranteed watt loss at 1.5 T/50 Hz to the guaranteed watt loss at 1.7 T/50 Hz.

Now the watt loss comprises the following in order given as per the following figures :-Tolerance chart
Based on the above we are giving below some International Standards for magnetic properties.

Product Range

Nanocrystalline Toroidal Cores And Ribbons|  Mitred Transformer Lamination  |  Step Lap  |  Toroidal Cores (Ring Cores)  |  Core Frame Assemblies
Rectangular Strips in CRGO and CRNO  |  Slit Coil  |  Taping and Copper Winding  

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