Re: [CAD_CAM_EDM_DRO] How do you compare steppers to servos

IF you want to match the torque speed characteristics of the stepper
system, find the torque curve for that stepper motor.
At the max rpm of the stepper, note the torque it will produce at
this working point. The holding torque is relatively useless for
figuring useable torque at speed.

Now, you have the basic information you need. It is a balance of
tradeoffs between torque and speed with the servo. Let us assume the
max speed of the stepper is 750 rpm. Most servo motors are rated at
relatively high rpm say 3000. To match the rpm of the stepper, you
will need a reduction of 3000/750 or 4:1. No take the torque rating
of the stepper (at speed, not the holding torque) and divide by this
ration (4) and this will give you the minimum CONTINIOUS torque
rating you want from your new servo.
From this, I hope you get the idea and proceed from there.


Art
AKA Country Bubba



At 12:01 PM 2/25/2011, you wrote:

>Suppose a system is advertised using nema23 steppers of some size,
>say 260 oz-in.
>
>You want to build the same system but instead use servos.
>
>How do you compare the compare power of the the steppers to the servos
>
>thanks
>Glenn