MK MAGNETICS TYPICAL TEST STANDARDS FOR BONDED CORES
| Material Description | Material Type Letter | Thickness (Inches) typical | Space Factor min | Watts/lb max | VA/lb max | Test B (kG) | Test Freq (Hz) | Gap VA per inch2 @ .001” max |
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| 3% Silicon Steel Silectron®1 |
A | .001” | .83 | 12.0 | 20.3 | 12.5 | 400 | 16.3 | ||
| A&B | .002” | .89 | 10.0 | 15.0 | 15.0 | 400 | 29.2 | |||
| A | .004” | .90 | 10.0 | 13.1 | 15.0 | 400 | 29.9 | |||
| B | .004” | .90 | 15.0 | 39.5 | 17.6 | 400 | 41.1 | |||
| B | .007” | .92 | 15.0 | 39.5 | 17.6 | 400 | 43.0 | |||
| A | .009” | .95 | 0.89 | 1.7 | 15.0 | 60 | 5.0 | |||
| B | .009” | .95 | 0.89 | 1.5 | 17.6 | 60 | 6.9 | |||
| T | .011” | .95 | 0.89 | 1.7 | 15.0 | 60 | 5.0 | |||
| B | .011” | .95 | 0.89 | 1.5 | 17.6 | 60 | 6.9 | |||
| A | .012” | .95 | 0.89 | 1.7 | 15.0 | 60 | 5.0 | |||
| 80% Nickel-Iron Supermalloy®2 |
D | .0005” | .65 | 12.0 | 18.0 | 5.0 | 10,000 | 57.7 | ||
| D | .001” | .83 | 14.0 | 21.0 | 5.0 | 10,000 | 70.6 | |||
| D | .002” | .89 | 20.0 | 30.0 | 5.0 | 10,000 | 81.2 | |||
| D | .004” | .90 | 15.0 | 22.0 | 5.0 | 5000 | 41.5 | |||
| 50% Nickel-Iron Deltamax®3 |
G | .0005” | .65 | 30.0 | 40.0 | 10.0 | 5000 | 115.3 | ||
| G | .001” | .83 | 37.0 | 47.0 | 10.0 | 5000 | 141.2 | |||
| G | .002” | .89 | 55.0 | 70.0 | 10.0 | 5000 | 162.4 | |||
| G | .004” | .90 | 3.5 | 6.0 | 10.0 | 400 | 13.0 | |||
| 50% Cobalt-Iron Supermendur®4 |
J | .002” | .89 | 20.0 | 72.0 | 20.0 | 400 | 52.0 | ||
| J | .004” | .90 | 19.0 | 66.0 | 21.0 | 400 | 58.6 | |||
| Metglas®5 2605SA1 | L | .001” | .82 | 10.0 | N/A | 2.0 | 20,000 | |||
| Nanocrystalline Prime | M | .0007” & .0005″ | .78 | 5.5 | N/A | 2.0 | 20,000 | |||
| Nanocrystalline Chinese | M2 | .0007” | .78 | 5.5 | N/A | 2.0 | 20,000 | |||
| B (kG) is flux density in kilogauss. Watts/lb & VA/lb are power loss and excitation VA when measured at the indicated flux (B) and frequency (Hz) under sine wave excitation. Gap VA for a 0.001” total air gap was calculated using the following formula: Gap VA = 4.1 × 10-4 × B² × frequency (Hz) × SF² × Ag.
Cores under 25lbs use 0.001” air gap and those in excess of 25lbs use 0.002” air gap. Total core watts = material watts/lb × core wgt in lbs. Total core |
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| 3% Silicon Steel Silectron®1 |
A | .004” | .90 | 12.0 | 22.7 | 15.0 | 400 | 51.8 | ||
| B&C | .004” | .90 | 18.0 | 68.4 | 17.6 | 400 | 71.0 | |||
| B | .007” | .92 | 18.0 | 68.4 | 17.6 | 400 | 74.0 | |||
| B | .009” | .95 | 1.1 | 4.0 | 17.6 | 60 | 11.9 | |||
| A | .012” | .95 | 1.1 | 2.9 | 15.0 | 60 | 8.7 | |||
| T | .011” | .95 | 1.1 | 2.9 | 15.0 | 60 | 8.7 | |||
| B | .011” | .95 | 1.1 | 4.0 | 17.6 | 60 | 11.9 | |||
| 50% Cobalt-Iron Supermendur®4 | J | .004” | .90 | 22.0 | 120.0 | 21.0 | 400 | 101.0 | ||
| Total 3-phase core excitation VA = material VA/lb × core wgt in lbs + gap VA. VA for a total air gap of 0.0015” was calculated with the following formula: Gap VA = 6.15 × 10-4 × B² x frequency (Hz) × SF² × Ag. E-cores under 25 lbs use 0.0015” total air gap, E-cores over 25lbs use total air gap of 0.003”. | ||||||||||
| Note: Odd or small core geometry may impact performance. | ||||||||||
| 1. Silectron® is a registered trademark of Allegheny Ludlum Steel Corp. 2. Supermalloy® is the discontinued product name of Western Electric Co. 3. Deltamax® is the discontinued product name of Alleghney Ludlum Steel Corp. 4. Supermendur® is the discontinued product name of Carpenter Technology. 5. Metglas® is a registered trademark of Metglas, Inc. 6. Finemet® is a registered trademark of Hitachi Metals Corp. 7. Vitroperm® is a registered trademark of Vacuumschmelze GmbH. |
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- MK Magnetics will gladly test cores to your specific needs
