. The Bell System technical journal . Fig. 2 — Magnetic parts, coil, and actuating card of AJ relay. netization curves. The clashed curve of Fig. 1 is the decreasing magneti-zation curve for the same gap as the adjacent magnetization curve. ([/ is a function of x, and changes as the armature moves. If thismotion occurs at a constant value of (p, there is no induced voltage andhence no electrical transfer of energy. A decrease in U must thereforerepresent mechanical work done on the armature. For a differentialchange dx in armature position, the mechanical work is Fdx, where F isthe pull exerte
. The Bell System technical journal . Fig. 2 — Magnetic parts, coil, and actuating card of AJ relay. netization curves. The clashed curve of Fig. 1 is the decreasing magneti-zation curve for the same gap as the adjacent magnetization curve. ([/ is a function of x, and changes as the armature moves. If thismotion occurs at a constant value of (p, there is no induced voltage andhence no electrical transfer of energy. A decrease in U must thereforerepresent mechanical work done on the armature. For a differentialchange dx in armature position, the mechanical work is Fdx, where F isthe pull exerted on the armature. A general expression for F is thereforegiven by: F = dU dx (^ constant) (2) ANALYSIS OF TULL AND MACXKnzAriOX MKASrUKMKNTS 83 It follows tVoin tlK\s(> considerations of onorgy balance Ihal IIh* mag-net i/at ion relations determine the relations anions; the electrical inj^iutto the coil, the stored energy, and the mechanical onlput , any generally appli(al)le and simple expression for the mag-ne
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
