A Bearingless Machine - An Alternative Approach

This work presents the analysis, synthesis and implementation of an alternative kind of bearingless machine that find application in industrial processes where vertical motor disposition and low torque requirement are needed. This proposal uses the own conventional electromagnetic machine structure to obtain simultaneously forces for rotation and radial positioning through the superposition of currents imposed by power electronic inverters to the stator Windings. Analog and digital controllers were used to test a prototype. This solution has the same advantages of commercially available magnetic bearings and additionally calls for less space. Experimental results show the validity of the methodology and control method used.