The Development or Torque in Slotted Armatures

The force on a current-carrying wire in a magnetic field and the torque developed by an armature are special cases of the principle that a current-carrying coil, when linked with a magnetic field produced by a separate agency, tends to assume a position such that its electrokinetic energy due to that linkage has maximum value. The elastic band properties of lines of force and the effect of Amperian currents in the teeth of an armature are wholly inadequate to account for observed results.