Re: General Stepper Motor Specs Question ??????

Holding torque is dependent on motor frame size, stack length and
whether it's round or "square".

Generally round motors are:

NEMA-23 50 in-oz per stack (stack = 1, 2, or 3)
NEMA-34 150 in-oz per stack
NEMA-42 600 in-oz per stack

"Square" motors generally have twice the holding torque of their
round motor equivalents.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Russ Waters <mycncworld@y...>
wrote:

> Hi all... been some time now that I had a subject for this

group........ It's about stepper motor specs and how they relate to
HOLDING TORQUE.

>
> I have found in my own research wheather or not to purchase

steppers on ebay, that the voltage , amps and resistance seem to be
related to the holding torque or how powerful the stepper is in
torque oz./inches.

>
> Example.. a stepper (size 23) that I recently found specs on was

rated 3volts @ 3amps, which by ohms law gave it a resistance of only
1 ohm. The "holding torque" was a good 185 ~ 265 oz./inches,
depending on how it was wired. So back to my question, can one
assume with simular specs, there would be a simular holding torque
for other steppers?

>
> Thanks in advance,
> Russ
>
>
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