SPRUHJ1I January 2013 – October 2021 TMS320F2802-Q1 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1 , TMS320F28052-Q1 , TMS320F28052F , TMS320F28052F-Q1 , TMS320F28052M , TMS320F28052M-Q1 , TMS320F28054-Q1 , TMS320F28054F , TMS320F28054F-Q1 , TMS320F28054M , TMS320F28054M-Q1 , TMS320F2806-Q1 , TMS320F28062-Q1 , TMS320F28062F , TMS320F28062F-Q1 , TMS320F28068F , TMS320F28068M , TMS320F28069-Q1 , TMS320F28069F , TMS320F28069F-Q1 , TMS320F28069M , TMS320F28069M-Q1
Jerk represents the rate of change of acceleration. So a larger jerk will allow the acceleration to increase at a faster rate. Jerk is an important factor to consider in applications where fragile objects can only tolerate a limited amount of acceleration changes. Jerk is also critical in applications where rapid changes in acceleration of a cutting tool can lead to premature tool wear or result in uneven cuts. For applications where the system jerk needs to be considered, using SpinTAC Move with the st-curve is essential. Jerk will also have an impact on the amount of current the motor consumes when changing speeds. Lower jerk will cause the motor to consume less current when changing speeds. This is due to the smaller jerk reducing the rate of acceleration increase. For applications where the jerk does not directly need to be considered, it can still have an impact on system performance.
Figure 14-2 compares three trajectory curves. They have the same start and end velocity and the same acceleration. The jerk for each of these curves has been modified. As the jerk increases the curve reaches the goal speed faster. A consequence of this faster movement is that the motor consumed more current while it was executing the trajectory curve. The maximum current is displayed on the graph. This test was done without any load in the system. If there were a load attached to the system, the increased jerk would have an even more dramatic impact on the maximum current.