Is there any difference b/w the settling time of the motor?

[kashif9744]

Settling time

Hi,
Is there any difference b/w the settling time of the motor for two different set points in a pid control.
and in designing on which criteria value of settling time should be select.
and what actually settling time shows practically.

 

[sunderwood]

Re: Settling time

Hi,

I believe the settling time is a function of the starting and final operating points, so the answer would be yes. I guess you would want to look at the worst case scenario of startup from zero speed to full speed under full load for your design.
Settling time gives you an indication of how long the motor drive takes to go from one operating point to another. (not 100% sure !)


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Hi,
Is there any difference b/w the settling time of the motor for two different set points in a pid control.
and in designing on which criteria value of settling time should be select.
and what actually settling time shows practically.

 

[laktronics]

Re: Settling time

Hi,
Settling time is defined as time taken for the output of a control system to settle within a specified error limit percentage, when a full scale step input is applied. It shows the speed of response of the control system to adjust to step changes in inputs. The percentage error limit specified in the Industry varies widely in the range of 10% for general control systems to 0.01% for accurate analog systems.

So, normally it is not specified for different set points, since for small step changes, the slew rate of the system will not come into picture. The settling time can be reduced by reducing phase margin of Aβ plot when its value is >1, making the system an under damped system, at the risk of stability. For a given system, an overdamped design (phase angle of Aβ less than Π/2 when its magnitude>1) will have more settling time.
Regards,
Laktronics

 

[cydi]

Settling time

The settling time is a function of the starting and final points of the control system