Velocity measurement for oscillating elements - uses magnet and coil system with part of magnet system attached to oscillating element

摘要

The method uses the electrodynamic principle with a magnetic field generated by a magnet system. A coil system is also provided. Both systems are movable w.r.t. each other. A voltage proportional to the velocity of the relative motion is collected from the coil system. The magnet system (4, 5, 6) is divided in two parts carrying out the relative movement to each other. One part is attached to the oscillating element, and the coil system is allocated to one of the two parts. In one embodiment, a single magnet is used in the centre of the system, another uses a pair of magnets at the side and yet another method uses four magnets with opposing poles facing each other in pairs.