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General Mach Discussion / Re: Jogging Servos
« on: December 15, 2010, 02:12:18 PM »
Servos have a power and torque rating just the same as steppers but the difference is a stepper has its max torque at zero and it decreases the faster you go and it drops off rapidly. A servo has usually also got its max torque at zero but it is usually constant right up to its rated speed and then it also has a peak rating which can come in to play when needed (if your drive can supply the current etc)
Problem is Keling along with many other hobby orientated suppliers mislead you in a way by stating the peak torque in the bold writing. Most industrial orientated suppliers state the rated torque and there is a big difference. Often peak torque is 3 or more times the rated torque so if you have motors that are sold as 9Nm peak then you will likely only have 2 or 3Nm rated torque.
This is a problem because you look at the steppers on your machine and see they are 9Nm so you get servos of a similar size but then you discover that the stated torque is actually the peak so really you have much smaller motors than the steppers.
Hope that makes sense
Hood
Problem is Keling along with many other hobby orientated suppliers mislead you in a way by stating the peak torque in the bold writing. Most industrial orientated suppliers state the rated torque and there is a big difference. Often peak torque is 3 or more times the rated torque so if you have motors that are sold as 9Nm peak then you will likely only have 2 or 3Nm rated torque.
This is a problem because you look at the steppers on your machine and see they are 9Nm so you get servos of a similar size but then you discover that the stated torque is actually the peak so really you have much smaller motors than the steppers.
Hope that makes sense
Hood