High performance electric motors are made with silicon steel plates, which have higher electrical resistivity than low carbon steel. In short, the material with which the stator and rotor cores are constructed must exhibit these properties: high relative magnetic permeability, low magnetic coercivity, high resistivity or electrical resistance, high induction of saturation. Whenever there is the incidence of an alternating flux over a magnetic nucleus, 1HP 56C motors there will also be induced currents, parasitic or Foucault currents on this nucleus. Both stator and rotor are made with laminated and insulated plates since this insulation between plates decreases the induced currents to a smaller area of circulation.
The losses by parasitic currents in a solid core are admirably greater than the losses in cores obtained from electrically insulated plates. The smaller the thicknesses of the plates, the smaller the parasite currents and the smaller the losses of power in these cores. The reduction of the induced currents can also be obtained from the increase of the electric resistance of the body, or from the increase of the electrical resistivity of the material, since resistance or resistivity and electric current are inversely proportional physical quantities.