Abstract
This paper proposes a frequency response function (FRF) measurement method for a rotor system that has a permanent magnet motor on its elastic shaft. In this measurement, the motor windings are used to generate not only rotational torque but also a radial excitation force, and the measured FRF is used as a stability index. The radial force on the rotating rotor is generated by adding a sinusoidal sweep d-axis current to the motor wingdings under dynamic eccentricity, which makes the magnetic field anisotropic. The proposed excitation method is theoretically explained and numerically simulated. Further, experimental measurements of the FRFs conducted using the radial excitation force generated by the motor windings were made on a test rig and the eigenvalues identified are given.
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