Acceleration

The rate of acceleration of the motor and driven load is a function of the effective load inertia and the acceleration torque. The acceleration torque at any speed, is the difference between the load torque at that speed and the torque produced by the motor.
Electrical Calculations will plot out the speed time curve for a motor and load provded that you have entered in the load torque cure and inertia, and the motor characteristics. You can select different starters and see the effects of these starters on the acceleration time.
If the load torque is close to the torque developed by the motor, the rate of acceleration will be reduced considerably and the start current should be increased to ensure that there is always a good margin between the two torque curves.