As shown in Figs. 1.2 and 1.29, the electrical analogy of the magnetomotive force supplied by a coil is an electrical voltage source, and the electrical analog for the reluctance of the steel part and the air gaps is an electrical resistor. Analysis of the reluctance actuator shown in Fig. 1.39 is based on reluctance circuits that correspond to the electrical analogy. Section 1.11.1 shows the static dc steady-state analysis and Sec. 1.11.2 shows the dynamic analysis with time-varying coil voltage and armature motion.