Abstract
High power and high rotational speed motors are required in machine tools and turbomolecular pumps. Bearingless motors, which have another set of windings in stator slots to produce radial forces, have been proposed by the authors. The machine has four-pole windings for torque production, and two-pole windings for radial force production. In this paper, bearingless motors with a non-salient pole rotor are analyzed. Inductance functions are derived assuming MMFs are sinusoidal. Both the rotor and stator surfaces are also assumed to be smooth. Mutual inductances between four-and two-pole windings are expressed as functions of rotor radial displacements. Radial forces are derived in relation to these inductances and winding currents. An induction machine type bearingless motor was built to confirm these equations and demonstrate performances of bearingless motors.
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