Design of micro-retainer to counter-balance spinning seismic proof mass

Abstract

An innovative magnetic module which is concurrently capable of performing as an actuator and a sensor is proposed and analyzed. The magnetic module is basically similar to a micro-scale Linear Variable Differential Transformer (LVDT) which is employed to actively adjust the height of a rotating seismic disc used in a gyroscope so that the pitch rate induced by Coriolis effect, due to exerted angular excitation, can be accurately measured. That is, the micro-magnetic module acts like an actuator for height regulation on the seismic proof mass by applying appropriate electric current to the primary winding of the LVDT unit. On the other hand, the secondary winding pair of the LVDT acts like a sensor which can detect the gap change, between the seismic rotating disc and the micro-magnetic LVDT module, and the rotation speed (i.e., frequency) by the induced current.

An innovative tri-axes micro-power receiver for inductively wireless power transmission

“…In our work, the micro-coils are fabricated onto the inverse-trapezoid fillister so that the contact angle of plated wire against fillister can be increased. Besides, the conventional design defect, too much void within the plated copper wire, can be prevented [ 21 – 23 ]. However, the housing for micro-coils and iron cores has to be built against the inner wall of the inverse-trapezoid fillister.…”