Abstract
This paper investigates the effect of a capacitive
three-phase auxiliary winding on the target variables of a threephase
squirrel cage induction motor (SCIM). The three-phase
auxiliary winding is only magnetically coupled to the stator main
winding. The three-phase SCIM is modelled using 2D
Finite Element Method (FEM). The flux density
distribution is numerically computed through the
magnetostactic solver, and the other target variables of
interst such as the efficiency, power factor and torque are
obtained through ac magnetic-transient solver. A
conventional 4 kW, 50-Hz, and 4-pole three-phase SCIM is
modified to accommodate both main and auxiliary
windings in the stator slots. The results obtained from
Finite Element Analysis (FEA) are compared with results
from experimental measurement. From both simulation
and experimental results, it is noted that the capacitive
auxiliary winding has not only enhanced the power factor,
but it also has a significant impact on the efficiency, torque
and other electromagnetic parameters of the three-phase
SCIM.