Tracking device with a coil driven actuator and a sensor coil to determine a position of the actuator

摘要

The invention relates to a tracking device in which a position of a coil driven actuator (5, 55) is determined using a sensor coil (11). A reference signal 12 having a determined voltage and frequency is fed to a driven coil (55). A position of the coil driven actuator is proportional to a distance between the driving coil and the sensor coil. The sensor coil produces an alternating voltage induced by an alternating magnetic field emitted by the driving coil. The alternating voltage is used to determine the position of the actuator.