# Motor parameters

**URL:** <https://discuss.bluerobotics.com/t/motor-parameters/189>\
**Category:** General Discussion\
**Created:** [February 3, 2016, 4:16am UTC](https://discuss.bluerobotics.com/t/motor-parameters/189 "2016-02-03T04:16:23Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![zeyadremaih](https://avatars.discourse-cdn.com/v4/letter/z/258eb7/32.png) [@zeyadremaih](https://discuss.bluerobotics.com/u/zeyadremaih)\
**Post date:** [February 3, 2016, 4:16am UTC](https://discuss.bluerobotics.com/t/motor-parameters/189/1 "2016-02-03T04:16:23Z")

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could you please send to me the rotor inertia , speed constant and torque constant of the T100 thruster

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**Author:** ![rjehangir](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rjehangir/32/671_2.png) [@rjehangir](https://discuss.bluerobotics.com/u/rjehangir)\
**Post date:** [February 3, 2016, 4:21am UTC](https://discuss.bluerobotics.com/t/motor-parameters/189/2 "2016-02-03T04:21:04Z")

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Zeyad,

We don’t have that information available, unfortunately. I do have analytically calculated values for speed and torque constant for the T100:

Ke (back EMF constant) 0.00204997 V/rpm  
Km (torque constant) 0.294530652 in-lbs/A

I hope that helps.

Best,

-Rusty

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**Author:** ![zeyadremaih](https://avatars.discourse-cdn.com/v4/letter/z/258eb7/32.png) [@zeyadremaih](https://discuss.bluerobotics.com/u/zeyadremaih)\
**Post date:** [February 3, 2016, 1:35pm UTC](https://discuss.bluerobotics.com/t/motor-parameters/189/3 "2016-02-03T13:35:16Z")

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i want to know if Ke ( back emf constant) is the reciprocal of the Ks (speed constant) RPM/V or i misunderstand

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**Author:** ![rjehangir](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rjehangir/32/671_2.png) [@rjehangir](https://discuss.bluerobotics.com/u/rjehangir)\
**Post date:** [February 4, 2016, 3:02am UTC](https://discuss.bluerobotics.com/t/motor-parameters/189/4 "2016-02-04T03:02:58Z")

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Zeyad,

Yes, the back EMF constant is the reciprocal of the speed constant.

-Rusty