Figure 292 -- Eddy currents in a solid armature

Eddy currents always occur when a solid metallic mass is rotated in a magnetic field, because the outer portion of the metal cuts more lines of force than the inner portion, hence the induced electromotive force not being uniform, tends to set up currents between the points of greatest and least potential. Eddy currents consume a considerable amount of energy and often occasional harmful rise in temperature.

• Hawkins Electrical Guide, Volume 1
• Chapter 19: Theory of the Armature
• Page 272, Figure 292
• Copyright 1917 by Theo. Audel & Co.
• Printed in the United States

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