METRIC STANDARDS

Allowable tolerances (mm)
Outside diameter Outside diameter Inside diameter Strip width
OD (mm) OD ID H
35-50 ± 1.0 ± 0.5 + 0.6
50-80 ± 1.25 ± 0.75 + 0.8
80-100 ± 1.5 ± 1.0 + 1.0
100-160 ± 2.0 ± 1.3 + 1.5
160-200 ± 2.5 ± 1.5 + 1.5
200-340 ± 3.0 ± 2.0 + 2.0

Note:

The tolerances are given for uncut toroids.
For cores with E£10mm
The diameter tolerances rise by +0.3mm.
The shape of toroids after cutting is ovalized.

Electrical Guarantees

Guaranteed magnetic properties of annealed non-impregnated toroids are corresponded to standard limiting properties for a used grades of grain-oriented silicon steel.

Note:

For steel thickness 0.30-0.35 mm it is correct only for toroids with inner diameter greater than 30mm and strip width greater than 10mm; For steel thickness 0.10mm correspondent  requirement -inner diameter >10mm and width >4mm.
In epoxy coated or impregnated toroids magnetic degradation is occurred due to mechanical stresses.
In these toroids the core losses are increasing approximately by 20-30% in comparison with raw material.

GRAIN-ORIENTED ELECTRICAL STEEL

AVAILABLE  GRADES AND GUARANTEED SPECIFIC LOSSES

Thickness,mm (inch) Grade, according to Maximum specific core losses, W/kg, at Stacking Factor(min)
AISI IEC 604048-8-7 EN 10303 1.7T/50Hz 1.5T/400Hz 0.5T/2000Hz
0.30(0.012) M-5 M 140-30 1.40 0.95
M0-H M 105-30 1.05
0.27(0.011) M4 M 130-27 1.30
M0-H M 100-27 1.00
0.23(0.009) M3 M 120-23 1.20 0.94
M0-H M 090-23 0.90
0.10(0.004) GO 10 15.0 0.92
0.05(0.002) GO 5 15* 0.89

 

Note:

Density=7.65 g/cm3

*- not guaranteed

For Electrical Guarantees and Core Dimensions List, Please register

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