Magnetic Force Components

 Overview The magnetic force components generate a reluctance force. They may be used to model position-dependent air-gaps and permanent magnet sections of translatory actuators. The position coordinate, $s$, of the mechanical actuator coincides with the variable $\ell$, which is the dimension that changes with the armature motion. The derivative of the permeance of a component with respect to armature position is calculated as $\frac{{\mathrm{dG}}_{m}}{\mathrm{dx}}=\frac{{\mathrm{dG}}_{m}}{d\ell }\frac{d\ell }{\mathrm{dx}}\cdot$ The parameter $\frac{d\ell }{\mathrm{dx}}$ must be set in each component to +1 or -1, according to the definition of the armature coordinate and the position of the element in the device's magnetic circuit. The reluctance force, ${F}_{m}$, is computed from the change in the magnetic coenergy, ${W}_{m}$, with respect to the armature position: ${F}_{m}=\frac{\partial }{\partial x}{W}_{m}=\frac{\partial }{\partial x}\left(\frac{1}{2}{G}_{m}{V}_{m}^{2}\right)=\frac{1}{2}{V}_{m}^{2}\frac{{\mathrm{dG}}_{m}}{\mathrm{dx}}\cdot$
 Components