AUTHOR : Su-Beom Park, Soon-O Kwon, Ji-Young Lee, Jung-Pyo Hong
ORGANIZATION : International Compumag Society
JOURNAL : COMPUMAG
YEAR : 2005.6.26
VOL : II
ISSUE :
PAGE : 134 ~ 135
Axial-flux type brushless dc (BLDC) motors have the flux
along the axial direction contributing to output torque. Since
the motors are generally air-cored, the energy density in
air-gap is lower than that in cored motors. However, the
air-cored axial-flux BLDC motor have little cogging torque,
and torque ripple is so small that they are suitable for the
application such as VCR, CD players and Floppy disc driver.
For the analysis of axial-flux type BLDC motor,
3-dimensional finite element analysis (3D FEA) is general,
because the flux distribution of the motor is 3 dimensional
[1]. However, 3D FEA requires large time for computation
and pre-processing. Therefore, an analytical method of image
using magnetic charge is used for the characteristic analysis
of the axial-flux type BLDC motor in this paper [2]. The
analysis result is verified by comparing the flux distribution
in the air gap to that from 3D FEA.
The characteristics of the motor, such as speed, torque,
current, and efficiency are calculated from the results of
image method and these results are considered to the design
of the motor [3]. Also, the distribution of the axial force
characteristics, the output torque, and harmonic according to
driving method are analyzed.