Control of thermomechanical anisotropy in high-speed microrotor with permanent magnet for energy conversion

A microturbine for energy harvesting is analyzed, and a design approach is assessed. A magnetic dipole, applied to a microrotor to convert energy of either a fluid or a gas into mechanical power, exhibits anisotropy of thermomechanical properties. The rotor dynamics, stability, and unbalance response are predicted. The coupled effect of rotation and temperature is then investigated, to detect the actual influence of the thermomechanical anisotropy of magnet, to be controlled by the contact pressure applied through an outer layer of carbon fibers. This methodology allowed a refinement of system requirements, and defining a design procedure to prevent damage.