Magnetic field calculation in permanent magnet motors with rotor eccentricity: without slotting effect

Author

Kim, Ungtae ; Lieu, Dennis K.

Author_Institution

Dept. of Mech. Eng., California Univ., Berkeley, CA, USA

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

2243

Lastpage

2252

Abstract

An analytical technique for predicting the instantaneous magnetic field distribution in the air gap region of permanent magnet motors with rotor eccentricity is developed. The governing equations and associated boundary conditions are formulated and solved by a perturbation method. The predicted solutions are verified by the results of a corresponding finite element analysis. The results show the effectiveness of using the perturbation method for this eccentric field calculation. According to this study, the additional flux density due to rotor eccentricity is proportional to the amount of the eccentricity in a small range and has a quite different distribution from the normal flux density without rotor eccentricity. Accordingly, rotor eccentricity may cause undesirable effects on brushless permanent magnet motors

Keywords

brushless DC motors; machine theory; magnetic fields; permanent magnet motors; perturbation theory; rotors; air gap; analytical technique; brushless permanent magnet motor; flux density; magnetic field; perturbation method; rotor eccentricity; slotless motor; Brushless DC motors; DC motors; Disk drives; Magnetic analysis; Magnetic fields; Magnetic resonance; Permanent magnet motors; Perturbation methods; Rotors; Vibrations;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.703862

Filename

703862