Dynamic modeling of a bidirectional magnetoelastic rotary micro-motor

A dynamic model is presented for a novel magnetoelastic rotary micro-motor. Magnetoelastic excitation results in a rotary motor with comparatively large payload even under direct wireless actuation, but the resulting stator behavior is significantly different from that of prior micro-scale rotary motors. A parametric modal model is developed from conservation of momentum, a second order linear distributed stator and ballistic rotor motion. The modes and a pre-stressed finite element model are also described to support the parametric modal model. The typical simulated model output and parametric analyses are presented with important trends and behaviors of the micro-motor motion, including stochastic features of rotary and vertical motion, and experimental validation. The dynamics of the micro-motor under certain inputs and design parameters are also estimated by the model.