VisualSizer Motion Profile

The next step in the motor sizing process is to define the duty cycle (motion/velocity profile) to be used and to enter the appropriate data. The data as entered will enable VisualSizer™ to calculate the final torque requirements.

The entering of the corresponding data for the duty cycle (motion/velocity profile) is represented by the 'Velocity Profile' window as shown here.

Also, as shown, there are certain sections in the window that are being used for the duty cycle setup. We will explain their function in detail when we get to the sample setup as described below.

At this time, naturally, the motion profile is empty and both graphs, velocity and torque, show lines at zero speed and torque.

In the following we will set up a trapezoidal duty cycle with a duration of 3 seconds and a maximum speed of 5 in/sec. This is most effectively accomplished through the 'Quick Setup' data entry table.

Step #1: Quick Setup

In the Quick Setup section click on the combo list and select a trapezoidal profile as shown in the picture above.

The data that need to be entered are:

• Vmax = Velocity

• tt = Total Time

• ta = Acceleration Time

• td = Deceleration Time

• tdw = Dwell Time

The program also allows the user to enter the max. travel distance, for instance, for a leadscrew. However, in the current example we need only to enter the maximum velocity and the total time. The program will automatically calculate the acceleration and deceleration time by dividing the total time into three sections.

After the maximum velocity and the total time had been entered, followed by a click on the 'Submit' command button, the program calculated and displayed the acceleration and deceleration time to be one second and the maximum distance traveled as 10 inches. Both, acceleration and deceleration time maybe overwritten by the user.

At the same time both displays, velocity and torque are being updated.

To make things a bit more interesting, we will activate the S-Curve feature. Just click on the S-Curve command button as shown here. The program will set the default to 100%, which may also be overwritten by the user.

Naturally both profiles, velocity and torque, will change as shown here.

Step #2: Detailed Motion Profile Setup (Optional)

As soon as the user hits the 'Submit' command button the data entry table for the detailed Motion Profile Setup will be updated as well, according to the data input in the Quick Setup Table. The program allows the user to modify all motion segments such as acceleration, constant speed, and deceleration. In addition it is possible to modify and add up to 25 segments in order to accomplish a more complex duty cycle.

In our example we will not attempt anything here.

This concludes the motion profile (duty cycle) setup.