Asymmetrical Eddy Currents and Concentration Effect of Magnetic Flux in the High Speed Rotating Disk

Conducting disks rotating at high speed were used to concentrate flux between the poles of an electromagnet, thereby generating a strong local magnetic field. While the disks are in motion between the magnet poles, the eddy currents generated have an asymmetrical distribution, which was calculated by numerical methods. These currents prevent penetration of the disks by the flux, which instead is concentrated in the space between the disks. Operating characteristics of such a device, and the relationships of the flux density to magnetomotive force while the disks are rotating and at rest, are given.