Hello Sai,
the issue could either be how the motor is paramaterized, or how the circuit driving the motor is set up. Is the controller switching at the appropriate times and does it have a high enough DC voltage? Is the mechanical load or the mechanical losses too high? There a number of potential issues that can't be known without seeing both the motor data sheet and the simulink model.
Have you tried modifying this example to match your system parameters?
Regards,
Joel
