AUTHOR : Liang Fang, Soon-O Kwon, Sung-Ii Kim, Jung-Pyo Hong
ORGANIZATION : International Compumag Society
JOURNAL : COMPUMAG
YEAR : 2005.6.26
VOL : III
ISSUE :
PAGE : 52 ~ 53
The air-gap flux density is the determinant factor of the
permanent magnet (PM) motor performance, such as back
electromotive force (back EMF) and torque characteristics.
So, to get the exact flux distribution in the air-gap, an
analytical method is used in this paper taking account of the
slot-opening effect of a stator.
As be known, cogging torque adds a ripple component to
the desired constant output torque from a motor, which can
produce vibration and noise that, in turn, reduces the
performance of the motor. By using the proved analytical
method, we analyzed the cogging torque according to the
parameters of the model, such as slot opening width and
pole-arc of magnet, which can help us to improve the output
torque quality with cogging torque decreased greatly. To
verify the analysis results, finite element analysis (FEA) is
performed and results are compared.