Title :
Effects of magnetically induced vibration force in brushless permanent-magnet motors
Author :
Kim, Ungtae ; Lieu, Dennis K.
Author_Institution :
Hitachi Global Storage Technol. Inc., San Jose, CA, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
This paper discusses magnetic force imbalance and cogging torque in permanent-magnet motors under both static and dynamic rotor eccentricity. The characteristic frequencies of magnetic force imbalance and cogging torque due to rotor eccentricity can be used for fault diagnostics and quality control of permanent-magnet motors. The paper derives analytical expressions for their characteristic frequencies. The validity of the expressions has been confirmed by finite-element analyses.
Keywords :
brushless machines; finite element analysis; magnetic forces; permanent magnet motors; rotors; torque; vibrations; brushless permanent-magnet motors; cogging torque; dynamic rotor eccentricity; fault diagnostics; finite-element analyses; magnetic force imbalance; magnetically induced vibration force; quality control; static rotor eccentricity; Forging; Frequency; Magnetic analysis; Magnetic fields; Magnetic forces; Manufacturing; Permanent magnet motors; Rotors; Torque; Vibrations; Asymmetric and symmetric motor; cogging torque; frequency spectrum; magnetic force imbalance; magnetically induced vibration; permanent-magnet motor; perturbation method; rotor eccentricity;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.847628
