Degaussing with Yokes
Functional Principle
Degaussing yokes create a magnetic degaussing field which emerges vertically from the active surface. Therefore, degaussing yokes are ideally suited for vertically positioned bar-shaped work pieces and horizontally positioned discs, plates or roller bearings, etc.
The maximum intensity of the magnetic field is at the upper surface of the yoke, and is then decreasing quickly.
Therefore, it is recommended that, for work pieces exceeding a height of approx. 60 mm, degaussing is performed from above as well as from below. This is achieved by a degaussing twin yoke; one yoke is mounted below the transport system, and the second yoke is positioned directly above the work piece.
The adjustment of the passage height is done either by a mechanical lifting device with crank handle or motor-driven with up/down button, or motor-driven via PLC of the production line.
The type of the yoke's denomination corresponds to the degaussing width in cm. An additional B indicates that the yoke has to be connected to low frequency generator EG 2422 only. Twin yokes are named with a 2 (in addition to the type).
Examples of designation:
EMJ 05 | degaussing width 50 mm |
EMJ 15 | degaussing width 150 mm, |
EMJ 15 B | degaussing width 150 mm, |
EMJ 15-2B | degaussing width 150 mm, |