Magnetic forces and moving body induced voltages: applications to velocity sensing and DC-AC conversion

摘要

This research and tutorial paper illustrates two interlinked phenomena of the greatest importance for power and energy systems engineers, i.e., magnetic forces and moving body induced voltages. A two-solenoid system with driving and sensing parts is analyzed taking into account that a moving ferromagnetic core can freely move along the system axial coordinate. At first-order approximation the frequency of the oscillating core movement is shown to be linearly controllable by the direct-current intensity injected in the driving solenoid. On the other hand the induced voltage on the sensing solenoid is shown to be a sinusoidal voltage with a frequency twice the one of the moving core.