Abstract:
The modeling of the rotor of a mediumrated squirrel cage induction motor depends on the
design parameters of the rotor slot, which control the
overall performance characteristics of the motor.
Among all performance measures of induction motors,
rated torque takes important attention because it is the
key measure determines the characteristics of the
induction motors. Variation of rotor slot geometries
affects the resultant resistance and reactance of the
rotor, which highly impact the losses, output power, and
speed characteristics. In this research work, a
parametric study on three rotor slot parameters,
namely, rotor slot depth (Hr), rotor slot opening height
(Hor), and rotor slot tooth width (Btr), is carried out by
using an analytical model of squirrel cage induction
motor. A medium-rated general-purpose squirrel cage
induction motor with 7.4 hp, 60 Hz, and 460 volts is
modeled in the MATLAB software platform. Developed
analytical model of induction motor is further validated
with Ansys Electronics Desktop finite element modelling
software platform. The dependency of each parameter
on rated torque is tested as a two-dimensional plot,
which has been extended into a four-dimensional scatter
plot. From the individual and four-dimensional plots of
the motor obtained through the simulation of the motor
model in the MATLAB software environment, it has
been proven that rotor slot parameter modelling has a
high impact on the rated torque of the medium-rated
induction motor.
