Induction planar actuator: An analytical, numerical and experimental study

The electromagnetic structure of the proposed induction planar actuator (IPA) comprehends a static ferromagnetic core with an aluminium slab as secondary, and a primary moving part called mover. The latter is fitted with three-phase orthogonal windings assembled on a slotted core that produces a linearly moving magnetic field. The interaction between the magnetic field and the electrical currents induces on the secondary due to that field results in a traction force on the mover the pushes it over the working plan of the actuator accordingly. Also, a normal force takes place and loads the linear bearings and supporting rails. The 3D flux density distribution of the actuator suggests the employment of a grain-insulated soft magnetic composite to reduce eddy currents and losses on the core. Flux density, traction and normal forces are studied by means of an analytical model proposed, with the aid of a finite element model and with the experimental test obtained from a prototype. The results present a good agreement and corroborate the feasibility of such actuator.