# what's the meaning of model parameter?

**URL:** <https://forum.deltamotion.com/t/whats-the-meaning-of-model-parameter/275>\
**Category:** RMCTools\
**Created:** [February 21, 2014, 10:47am UTC](https://forum.deltamotion.com/t/whats-the-meaning-of-model-parameter/275 "2014-02-21T10:47:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mars\_bruce\_lee](https://forum.deltamotion.com/letter_avatar_proxy/v4/letter/m/a587f6/32.png) [@mars\_bruce\_lee](https://forum.deltamotion.com/u/mars_bruce_lee)\
**Post date:** [February 21, 2014, 10:47am UTC](https://forum.deltamotion.com/t/whats-the-meaning-of-model-parameter/275/1 "2014-02-21T10:47:25Z")

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what’s the meaning of model parameter? I can not find the Detailed explanation。

model gain pos、model gain neg、model time constant  
 ![2.JPG](https://forum.deltamotion.com/uploads/default/original/1X/5b3e7e78efc1d3e0c1b84c5775674bc761f1431b.jpeg)

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**Author:** ![Jacob\_Paso](https://forum.deltamotion.com/letter_avatar_proxy/v4/letter/j/439d5e/32.png) [@Jacob\_Paso](https://forum.deltamotion.com/u/Jacob_Paso)\
**Post date:** [February 21, 2014, 5:42pm UTC](https://forum.deltamotion.com/t/whats-the-meaning-of-model-parameter/275/2 "2014-02-21T17:42:38Z")

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The autotuning calculates the mathematical model of the system. The parameters it calculates are standard mathematical concepts. A first order system is defined by a gain and a time constant. The gain is in units of ((pu/s)/V). This tells us how fast the axis moves for each volt of Control Output. There is a gain for each direction. The time constant defines how quickly the axis responds. The small time constant means the axis responds quickly.

This page gives some explanation: [http://facstaff.cbu.edu/rprice/lectures/firstorder.html](http://facstaff.cbu.edu/rprice/lectures/firstorder.html)