Re: How do you compare steppers to servos

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Art Eckstein <art.eckstein@...> wrote:
>
> 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
>