Motor & Gearing Torque Requirements: Spec'ing Out Motors & Gears

[ncr7]

I haven't spec'ed out motors before but I am looking to use a motor with the attached torque/speed characteristics. I am looking to use a gear with the following characteristics,

Gear Reduction Ratio: 20:1
Nominal Output Torque: 6Nm
Max Acceleration Output Torque: 9Nm
Nominal Input Speed: 4000 RPM
Max Input Speed: 5500 RPM
Efficiency at Nominal Torque: 98%

How would you go about telling how much torque is needed to turn the gear?
I was thinking it was something to do with the Nominal Input Speed...

For those of you who have spec'ed out gears and motors what, checks do you make to ensure the application works?

 

[Navin A S]

To determine the torque needed to turn the gear, you need to multiply the output torque (6Nm) by the gear reduction ratio (20:1). This will give you the input torque required, which is 120Nm. When spec'ing out gears and motors, it is important to ensure that the motor and gear will be able to handle the amount of torque, speed, and acceleration that your application requires. Additionally, it is important to make sure that the gear and motor are correctly sized to fit the application and that they are compatible with each other. It is also important to make sure that the gear and motor have sufficient efficiency at the required torque and speed.