Curve Fitting     

In the Sequence form, right-click on a single acceleration/deceleration ramp segment and select "Create Curve Fit Spline".

In the this example, a motor accelerates a conveyor mechanism from 0 to 4.78m/s (2,871rpm). Specify the motor peak torque margin and jerk limit and click OK.

The calculation run begins, and in this example takes about 8sec. The calculation run can take anywhere from 5-45sec depending on the settings and the application. For example, a segment with a Thrust Formula takes longer.

In this example, the motor rated peak torque curve is curve fitted to 10% margin, and a jerk limited to 500m/s3 at the start of the acceleration ramp. A 7th order spline of 8 segments is all that is required.

Taking this further, we can also curve fit to multiple rated curves. In the example below, in addition to the limits used in the example above, the inverter rated peak current and infeed peak rated power curves are also curve limited to 10%.

Click OK, and the calculation run takes 45sec because more in-depth calculations are required.

In this case, the motor peak torque margin is no longer a limiting factor. Rather, at lower speeds, the inverter peak current margin is the limiting factor, until about 1,875rpm where the infeed peak power becomes the limiting factor.

What makes this curve fit so remarkable is that a spline of only 10 segments is created against multiple rated curves, all the while providing a smooth continuous jerk profile.