| Summary: | This paper introduces a resonance avoidance method for a 2-degrees-of-freedom (DOF) controlled maglev motor using d-axis current. The rotor of the 2-DOF controlled maglev motor has a disk shape, and the rotor radial motion is actively controlled. However, the axial and tilting motions are passively suspended, and hence, the significant rotor vibration is caused during rotation. To avoid the axial and tilting resonances, the motor d-axis current that regulates the strength of the magnetic field is provided for changing the axial and tilting stiffnesses, and hence, resonance points can be avoided during rotation. The axial and tilting stiffnesses with and without d-axis current were calculated by finite element method (FEM), and the rotor resonances were estimated. The rotor vibration was measured using a test machine with and without d-axis current, and the rotor vibrations in the axial and tilting directions were successfully reduced. The experimental results have verified the effectiveness of the proposed resonance avoidance method.
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