Abstract :
Ferromagnetic cores are needed in motors so that useful forces (and thus power) can be obtained from economically sized machines. Typically, iron is used as a flux multiplier for this purpose. However solid iron, being conductive, sustains strong eddy currents when magnetic fields within it change over time. Such currents are dissipative of energy as well as inhibiting flux penetration by Lenz´s Law opposition. Here, therefore, the authors examine the possible use of coated steels in the ferromagnetic cores of small electric motors
