Dear Mr. Abdullah!

I simulated the IM model with your parameters by means of the same equations as you refered. I've got the different results (by the way, you have to point the rated stator voltage and acceleration time). Do you have full datasheet on your motor? Maybe, it needs not only rated parameters but also start parameters of the equivalent circuit. The data specs may differ from the real ones due to a number of reasons (for one, windings temperature, skin effect, saturation, etc.). Try to compare simulated and real parameters of the motor (at least, you can easily measure the stator winding resistance) and figure out if there is match or difference.