Calculation using acceleration torque or acceleration time
4.3.1 Acceleration torque
A load can only be accelerated when the driving motor provides a greater torque
than the load requires at the time. The difference is called the acceleration
torque MB. The acceleration torque and the flywheel moment of the motor,
transmission, and system to be accelerated yield the acceleration time tA. In
many cases the simplified assumption is made that the load torque is constant
during acceleration. This assumption is reached by calculating an average load
torque and replacing the variable motor torque by a constant mean acceleration
torque which is determined from the characteristic.
For a certain starting time tA the required acceleration torque MB is computed as
follows: