SIMULATION OF INDUCTION MOTOR USING MATLAB/SIMULINKThere is seldom need to simulate an IM in arbitrary reference frame. For power system studies, induction machine loads along with other types of power system components are often simulated on a systems synchronously rotating reference frame. But, for transient studies of adjustable speed drives, it is usually more convenient to simulate the induction machine and its converter on a stationary reference frame. The simulation of Induction Motor in the synchronously revolving frame has been developed. Inorder to obtain the stationary reference frame circuit, the value of e has been set to zero.

Schematic of modelling of induction motor

EQUATIONS1s vqd 0

2 3

0 1 2

1 2 3 2 1 2

1 2 3 2 1 2

vas vbs vcs

e vqs e vds

cos e sin ee F ds b e F ds b e b r

sin e cos e

s vqs s vds

dFqs dt dFds dt dFqr dt dFdr dt

b vqs

Rs Fmq xls Rs Fmd xls Fdr Fdr

Fqs Fds Fqr Fdr

b vds

b vqr

Rr Fmq xlr Rr Fmq xlrFqr xlr Fdr xlr

b vdr

e b

r

Fmq Fmd iqs ids iqr idr

* xml * xml

Fqs xls Fds xls Fmq

Fqs Fds Fqr Fdr

xls Fmd xls Fmq xlr Fmd xlr

All the currents found above are in synchronously rotating reference frame Converting to stationary frames iqs s ids

cos e sin e

sin e cos e

e iqs e ids

Equivalent circuit representation of IM in synchronous rotating frame

Equivalent circuit representation of IM in stationary rotating frame