Selecting servomotors criteria

Hello. I am a beginner in robotics and have some questions.
When selecting a motor, how do i choose the watt in each motor? for example how do i know if i should use EC-i-40 70W or 100W?
For the selection i just checked:
1.the maximum calculated torque(including gears conversion) does not exceed the stall torque.
2. I selected a speed constant Kn>(nl+Δn/ΔΜ)/(Applied voltage).

Thankyou very much

Hi @el_t,

You can find the answer about power of the motor here: https://community.robotshop.com/tutorials/show/how-do-i-interpret-dc-motor-specifications

Power rating :

If a motor’s power is not listed, it can be approximated. Power is related to current (I) and voltage (V) by the equation P = I*V. Use the no load current and nominal voltage to approximate the motor’s power output. The motor’s maximum power (which should only be used for a short time) can be approximated using the stall current and nominal voltage (rather than maximum voltage).

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Hi there @el_t!

I see @igor_X already gave you an answer but I think this tutorial will come in handy too!

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