Using Magnetic Sensors for Absolute Position Detection and Feedback.

Several types of absolute position detection are commercially available including linear magnetic field sensing devices. In the implementation of an electromagnetic levitation device absolute position detection is the key component to a solid design. However, applying such a sensing device to detect absolute position in a changing field environment proves much more difficult than typical use. Filtering, analog to digital conversion, and digital PD feedback control loops are all considered in the implementation of the design.