Effects of magnetic properties of steel on flux response

It has been shown that the relative magnetic permeability mu s and the electric resistivity rho of magnetic steel have serious effects on the flux response of electromagnetic actuators used in automobiles. These effects are quantitatively examined by a magnetic field calculation based on the finite-element method. Also, some criteria for selecting optimum magnetic steel are proposed in view of the minimum allowable mu s and rho . It is shown that when an electromagnetic actuator is used in a linear range both mu s and rho must be large. The minimum allowable mu s and rho are 1000 and 72 mu Omega -cm, respectively. When the actuator is used in a nonlinear range, B/sub 20/ must be large enough to broaden the linear range.<
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