Analysis of a DC XY-actuator

The proposed XY-actuator is composed of a ferromagnetic core, a set of two perpendicular planar windings, and a mover fitted with permanent magnets that produce the excitation magnetic field. The actuator was studied under the use of two different armature cores: solid steel, and a soft magnetic composite (SMC). The movement of the mover over the working plan occurs when the coils of the windings are excited. Owing to the velocity, eddy currents are induced in the core accordingly. As a result, a damping effect occurs. It can be limited with the use of a material with high electrical resistivity such as the SMC. A numerical dynamic analysis by a finite element model produced the verification of current induced, as well as the magnetic flux density distribution, and the forces involved. With the experimental results, it was possible to obtain an electromagnetic coefficient of friction due the eddy currents.