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Grade B14Z3 -Schunk Germany- Size : 39.5×19.5x40mm
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| Grade | Material type | Voltage drop | Coefficient of friction | Test conditions | Resis- tivity µΩm | Rockwell | Bending strength N/mm² | Bulk density g/cm3 | Metal content % |
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| HR10/40 | HR5/40 | ||||||||||||||||||
| C40Z3 | Bronze-graphite | vl | l | 6 | 0.2 | 100 | — | 55 | 4.20 | 75 | |||||||||
| Classification | Symbol | Voltage drop between two carbon brushes connected in series Uü (V) |
Coefficient of friction µ |
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| Very low | vl | < 1.5 | < 0.08 | |||||||||||||||||
| Low | l | 1.5 – 2.2 | 0.08 – 0.15 | |||||||||||||||||
| Medium | m | 2.2 – 3.0 | 0.15 – 0.22 | |||||||||||||||||
| High | h | > 3.0 | > 0.22 | |||||||||||||||||
| No. | Current density A/cm² |
Peripheral speed m/s | Brush pressure cN/cm² | Collector temperature °C |
Related to the following fields of application of the carbon brushes |
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| 1 | 12 | 30 | 250 | 90 | Stationary D.C. machines with and without commutation aids |
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| 2 | 12 | 50 | 250 | 90 | Traction motors | |||||||||||||||
| 3 | 10 | 30 | 200 | 90 | Three-phase commutator motors | |||||||||||||||
| 4 | 6 | 60 | 160 | 90 | Turbogenerators and turbomotors | |||||||||||||||
| 5 | 20 | 30 | 200 | 90 | Slip-ring machines and low-voltage machines | |||||||||||||||
| 6 | 16 | 30 | 200 | 90 | Slip-ring machines and low-voltage machines | |||||||||||||||
| 7 | 12 | 30 | 200 | 90 | Slip-ring machines and low-voltage machines | |||||||||||||||
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